# Computer Network Information Security Monitoring System Based on Big Data Era

Authors: Yu Sun; Xiaorong Liu; Xiaoli Shen
Journal: Security and Communication Networks
 (2022)

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## Abstract

With the rapid advancement of society and the level of programming and the rapid development of computer technology, networking and information are playing an increasingly important role in the social life of the masses. Creating and developing a network information security monitoring system have become one of the most important ways to keep a computer running smoothly. Traditional information security systems cannot adapt to the ever-changing network environment. If only relying on it to maintain network security, it will be far from effective monitoring and defense. Based on the theory of network information security, this study analyzes the characteristics of network information and the information security monitoring technology at the current stage. Based on the background of big data era, a new type of computer network information security monitoring system is proposed. This system is compared with the traditional network information security monitoring system, and the performance and stability of the system are investigated, respectively. The experimental data show that the network information security monitoring system designed in this study can achieve more than 99% detection rate of external attacks in a network environment with a background traffic of 10M. Its false alarm rate is lower than 4%, and the false alarm rate is lower than 7%. The qualitative mean reaches 93.02%, indicating its good monitoring accuracy and stability. By popularizing it in the current network environment, it can effectively identify and defend information attacks and maintain the development of network information security.


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## Body

## 1. Introduction

With the improvement and progress of science and technology, the pace of social informatization is gradually accelerating. As one of the important elements of development in the 21st century, information has become a symbol for measuring the comprehensive strength of a country. Since the first electronic computer was created in the 1940s, computers and other related technologies have attracted the attention of many researchers and have continued to develop in depth. Nowadays, computer network information not only has involved many aspects such as social production and market economy but also is inseparable from every mass. The normal operation of social life gradually relies on the computer network platform. The computer network information security monitoring system, such as the nervous system of the human brain, occupies a very important position. However, while the computer network continues to affect people’s lives, its information security is also constantly faced with new challenges. An endless stream of insecure factors is impacting the development of computer networks. For example, under the influence of the complex network environment, hacker attacks, Trojan horse viruses, and other illegal intrusions seriously threaten the development of network information security. Therefore, building a network information security monitoring system, perfecting the network security system, using general intrusion detection technology, and detecting network attack intrusions and various unsafe behaviors have become the primary tasks to maintain the healthy development of computer networks.The current era belongs to the era of big data. Big data technology and its related information science and technology have been continuously infiltrating traditional production and life and promoting their fully intelligent and informatized development. Big data have played an irreplaceable application value in many fields. For example, it can be seen in the fields of value such as military, medical, financial, and communication. It not only changed people’s production and life and daily life but also changed people’s way of thinking, being a symbol of social renewal and change. In addition, more and more attention is being paid to network information systems and people are also paying more and more attention to network information security issues. Big data can provide strong data support for computer networks, becoming a security barrier against attacks and intrusions of foreign information.Based on the technical basis of a network information security monitoring system in the big data age, the present work designs a network information security system. This robot can detect real-time network information security monitoring. It can also identify different hacking methods and provide multiple warning methods depending on their characteristics. This is an important guideline and a useful tool for improving the identity and security level of the existing monitoring system, providing new information for some relevant research on building network security.


## 2. Related Work

In recent years, many scholars have conducted in-depth research on network information security monitoring system. Tayal et al. believed that many network environments are constantly facing increasing security threats in the form of Trojans, worm attacks, and viruses. He emphasized the methods, techniques, and mechanisms of real-time analysis and post-event forensic analysis in previous network security monitoring [1]. Dimitriou and Antoniou provided a framework to quantitatively analyze the formation of social networks based on comprehensive network information security indicators. He also provided a piece of more valuable information related to the exchange of connected users through data from social media connections [2]. Kumar and Rajakumar discussed various network information security issues, proposed a new encryption method for adaptive period threshold-sensitive wireless protocol based on elliptic curve cryptography, and used shorter keys for encryption and decryption to protect data [3]. Abutu et al. developed a base station with automatic detection and configuration system to detect new sensor nodes and faulty nodes and update users in real time, which was also suitable for network security environment monitoring [4]. The computer network information security monitoring system has been developed relatively maturely in the current market after the profound research of countless scholars. However, with the improvement of the level of science and technology, the influence of factors that cause shocks and challenges to network information security is also increasing. The demand for computer network information security monitoring systems centered on the era of big data has significantly increased.To gain an in-depth understanding of the era of big data, this study also explores its related research. Xu et al. studied the relationship between the Internet of vehicles and big data in the era of big data, mainly including how the Internet of vehicles supports the transmission, storage, and calculation of big data and how the Internet of vehicles can benefit from big data from the characteristics and performance of the Internet of vehicles [5]. Huda et al. considered how to meet the needs of adaptive teaching in the era of big data. He explored a framework model to adapt to the era of big data and help teachers improve teaching performance and optimize access to resources [6]. Chang et al. explored big data analytics to improve edge caching capabilities and also discussed learning network-based caching methods in the big data age. He used large amounts of data for content analysis and process design caching [7]. Shen and Chan provided a comprehensive review of forecast information sharing for supply chain management in the era of big data, inspired by various timely and important issues, discussing the value and barriers of sharing forecast information and some related challenges [8]. These studies provide a good long-term analysis of big data, but due to the rapid growth of time, the security of network information has become an important part of everyday human life. Previous research could not meet the high requirements for network security in terms of regular system monitoring and real-time performance. Therefore, researching the computer network information security system based on the time of the big data should be carried out without delay.


## 3. Computer Network Information Security Monitoring System Based on Big Data Era

### 3.1. Theoretical Basis of Network Information Security in the Era of Big Data

The theory of network information security is composed of the theoretical knowledge of various disciplines. It covers not only computer theory, communication theory, and Internet security theory but also theoretical knowledge at the mathematical level, such as statistical analysis, linear programming, and applied mathematics. It is a comprehensive theory with diversified and multidirectional characteristics.


#### 3.1.1. Definition of Network Information Security

Network information security, as the name suggests, refers to the security of information generated in the network environment. It includes both the equipment security that maintains the normal operation of the network environment and the data security that is communicated and transmitted in the network environment. From a macro-point of view, as long as the information and data in the network environment are private, effective, real, operable, and self-controllable, technology and basic theories belong to the field of network information security that needs to be analyzed and understood [9].


#### 3.1.2. Characteristics of Network Information Security

With the derivative development of a number of emerging technologies such as Internet technology and communication technology, the market operation has been fully intelligent and informatized. While bringing more development opportunities and economic benefits, the contradiction of information security in the network environment has gradually emerged. In addition to the economic, construction, and political security of the past, information security in the network area is vital. From the general analysis, the characteristics of network information security are initially divided into three categories [10]:(1)
Vulnerability of network information securityThe network environment is a public space with a special nature. It was founded on the principle of openness and freedom, which is not only reflected in people’s behavior but also reflected in the borderless, distanceless, and unimpeded network environment. It greatly facilitates the sharing and utilization of information resources. Due to the neglect of network information security in the early network construction, the management level of the Internet lags behind the application, so the development of the Internet is in a state of borderless in most cases. The vulnerability of network information security is mainly reflected in all aspects of design, implementation, and maintenance. The design stage serves a small number of trusted users and does not fully consider the threat factors of information security. It is impossible to achieve a flawless prevention and control design. This makes the operation of the entire environment hide huge security holes in practical applications. When purifying and repairing the network environment, due to the different functions and audiences of various software packages, and the environment itself is very complex, factors that threaten the security of network information also emerge one after another. Even though the network has been equipped with many defense means and facilities in the theoretical stage of its creation, in the actual network operation there will still be objective limitations, such as insufficient technical support or the impact of new intrusion methods. Under such a situation, every tiny flaw in security protection may cause each network node to suffer from information intrusion and attack and cause serious accidents such as data leakage, network failure, and equipment damage.(2)
Suddenness of network information securityThe transmission of network information requires the support of computers and other equipment and technologies. The security of network information is also affected by its characteristics. The suddenness of network information security refers to the internal operation failure caused by the invasion of foreign computer viruses. Such failures are often immediate, sudden, and extensive. At this stage, the definition of the concept and scope of computer viruses is a series of malicious codes that can be reproduced and reproduced in network systems, which are artificial, intentional, and aimed at destroying network information security. Attacks of such malicious code are usually unpredictable and sudden, which can cause extensive damage to network information, data, and files.(3)
Global nature of network information securityThe sharing and circulation of network information can be carried out without hindrance, and such high efficiency has never been used in any previous era. Communication and interaction in the network environment make all countries in the world closely connected, and the global nature of network information security is gradually formed on this basis [11]. However, with the surge in the number of Internet users, the possible negative effects of communication and interaction in this public environment are also enormous. The global nature of network information security also means that if a link of network information security is attacked, it will lead to a “butterfly effect.” Therefore, only by strengthening international cooperation the security of network information can be better maintained.


### 3.2. Technical Basis of Network Information Security Monitoring System in the Era of Big Data

The network information security monitoring system is a subsystem built inside the network system that can realize real-time monitoring. Its main function is to maintain network information security and stabilize the safe operation of the network environment. It mainly monitors the nodes of each data packet in the network environment and restores them effectively. It can also interpret and analyze various application software packages in the network system, which will detect software and data information with higher security risks to prevent the occurrence or spread of information attacks in time [12].The network information security monitoring system should observe the information, data, and files generated in the network environment in real time. The system then intercepts incoming information and responds to and handles threats that can cause system failure and paralysis. Finally, the observation records and identification records are stored in an independent data repository, and the operation log of the computer system is supervised and reviewed to ensure that the equipment is in a stable and safe state. It provides a solid barrier for the normal operation and circulation of the network environment and network information [13]. Therefore, intrusion detection technology, log review technology, and security risk assessment are the technical basis of network information security monitoring system.


#### 3.2.1. Intrusion Detection Technology

Intrusion detection technology refers to a technology that collects several important information and data in an organized manner within a computer network and interprets and analyzes them according to certain requirements and standards [14]. Through such technology, the abnormal factors or the factors that violate the safety management rules and regulations established by the system are monitored and identified. It mainly analyzes the node status of each data packet in depth by monitoring the initial information and data generated in the network environment and automatically matches and identifies it with the characteristics and symbols of foreign intrusion attacks. If the network environment and network information are abnormal, it will immediately enter the early warning state. Intrusion detection technology is generally only used for abnormal identification inside computer systems and network systems, but from a higher level, this kind of identification is also carried out for information systems, and intrusion detection technology can identify malicious attacks and illegal intrusions suffered by information systems.According to the source of network information, the composition of the detection system, and the specific methods used for detection, the intrusion detection system is also divided into different categories. As shown in Figure1, this study mainly analyzes the three most representative categories.(1)
Host-Based Intrusion Detection System: this type of intrusion detection system is carried out by examining the logs of the internal operation of the computer system. When the computer system is in normal operation, it will monitor the network environment and the operation status of network information in real time. Then, it will form data records and store them in the log. The intrusion detection system examines these logs to identify malicious attacks and illegal intrusions. Its core purpose is to intercept the further expansion of the intrusion behavior based on the detailed analysis of the log after the intrusion behavior has a certain impact on the network information, preventing more serious consequences. The response time of the system is related to the log review time. The disadvantage of host-based intrusion detection systems is that they cannot effectively monitor in real time.(2)
Network-Based Intrusion Detection System: this type of intrusion detection system uses the status of the initial data packet as the identification standard. It compares the subsequent running state of the system with the initial state and judges whether the system is in an abnormal state by comparing the rules and sequences in the result. The network-based intrusion detection system is mainly used to identify phenomena such as pattern anomalies, sequence anomalies, and frequency anomalies, and it can also be used to identify low-level time correlations in the network.(3)
Hybrid Intrusion Detection System: this type of system is a combination of the first two intrusion detection systems. Therefore, it has the characteristics and functions of both a military intrusion detection system and a network intrusion detection system. It is the most common method in the application of intrusion detection technology.Figure 1
Instruction detection system classification.


#### 3.2.2. Computer System Log

To prevent the information and data possessed by the computer system from being damaged, the computer usually records the state of resources in real time through logs and records and saves every operation and change in the system. Then, the computer will sort them according to the time before and after [15]. These records are important for detecting and identifying whether the system is in an abnormal state. Each event independently forms a type of log, and each type of log forms a log file according to certain rules. In general, log files are directly viewable by system administrators. The log mainly contains the main content of the event, the date of occurrence, and other important information. As shown in Figure 2, it records and saves valuable and meaningful information for various application software, databases, firewalls, and other important components existing in the computer, to monitor and protect the system. The information in the log file has the following functions: identifying the means and scope of intrusion, recording malicious attack information and forming reports, and protecting the security of system resources.Figure 2
Internal and external structure of the computer.


#### 3.2.3. Network Information Security Assessment Technology

This study uses the evidence theory in one of the big data technology theories to analyze the network information security assessment technology [16]. Evidence theory refers to the real and credible scene environment and objective attributes of things that need to be understood when analyzing tasks, which can be obtained through relevant theories, indirect experience, and actual observations, as shown in Figure 3.Figure 3
Way to obtain credible number in evidence theory.Suppose there is a proposition, for this proposition, a set of possibilities that can be understood and predicted will be formed, which is characterized byΘ. In this proposition, any proposition that one considers corresponds to a subset of the set. The set Θ is also a set of identification frameworks. The generation and construction of sets are entirely dependent on people’s thinking ability and cognitive scope.Assume the following formula [17]:(1)Θ=θ1,θ2.Then, there are power sets ofΘ as follows [18]:(2)2θ=∅,Θ,θ1θ2.Then,m: let Θ be the recognition frame, if the mass function: 2Θ⟶0,1 can be implemented [19]:(3)m∅=0,(4)∑A⊆ΘmA=1.In formulas (3) and (4), m is the basic credibility assignment function in Θ. In the range of A⊆Θ, mA represents the basic credibility of A, which refers to the derivation of evidence. Its derivative combination is called the nucleus. In the m function, mΘ points to m and no subset is given. No hint is given, so this can only be used to replace the information that is not yet known.Bel: let Θ be the recognition frame, and let m: 2Θ⟶0,1 be the basic credibility assignment function on Θ. Bel:2Θ⟶0,1 can be achieved as follows [20]:(5)BelA=∑B⊆AmA.Then,Bel can be regarded as the reliability function of Θ. The definition of reliability function is the correlation function with basic reliability.The basic credibility is assigned as follows:(6)mΘ=1,mA=0A≠Θ.The result of the confidence function is the simplest. At this time,(7)BelΘ=1.WhenA≠Θ,(8)BelA=0.This confidence function becomes the null confidence function. The null confidence function is mainly suitable for situations without any evidence.LetBel1 and Bel2 be the two reliability functions in the same Θ, and then, m1 and m2 represent the respective basic reliability distribution functions of the two functions.If(9)K=∑Ai∩Bj=∅m1Aim2Bj<1,then these two terms can be combined. The formed m: 2Θ⟶0,1 satisfies the following formula:(10)mA=0,A=∅,∑Ai∩Bj=Am1Aim2Bj1−K,A≠∅.1/1−K is treated as a normalizing factor whose main purpose is to prevent the confidence that ∅ is set to be nonzero when normalizing.Bel1, Bel2, …, Beln are set as the reliability function in the same 2Θ, and then, such a collection can be expressed as follows [21]:(11)Bel1⊕Bel2⊕Bel3⊕…⊕Beln.Ifm1, m2, …, mn represent the basic trustworthy distribution functions of Bel1, Bel2, …, Beln, respectively, the evidence combination rule can be expressed as follows:(12)m=m1⊕m2⊕m3⊕…⊕mn,⊕ in formula (12) refers to the direct sum, which is the final conclusion obtained through the analysis of the aggregated evidence. In the program of set construction, although it is not closely related to the order, it also achieves the requirement of associative rate.To avoid contradictions, the corresponding weights are set in each evidence set. The evidence set can be expressed by the following formula [22]:(13)E=E1,E2,…,En.The weight coefficient ofEi is ωi. Then, all the weight coefficients construct the weight vector of the evidence as follows:(14)W=ω1,ω2,…,ωn.It satisfiesωi∈0,1 and ∑i=1nωi=1. The weight factor reflects the importance of evidence in the synthesis process.Firstly, it is necessary to set the initial reliability value for any proposition inΘ, and then, the corresponding vector, W=ω1,ω2,…ωn, is set.Secondly, the vector maximum is set to be(15)ωmax=maxω1,ω2,…ωn.Relative weight vector can be obtained as follows:(16)W’=ω1,ω2,…,ωnωmax.After gettingW’, the discount rate of the initial reliability value is calculated through(17)αi0≤αi≤1,1−αi=ωiωmax,i=1,2,…n.Thirdly, according to formulas (18) and (19), the initial reliability value of each proposition is correspondingly changed by αi, and the distribution function of the changed reliability value is as follows:(18)mi′Ak=1−αimiAk,(19)m′Θ=1−αimΘ+αi.In formulas:k=1,2,…di, di—the number of non-Θ basic credibility in the identification framework provided by evidence Ei.The improved reliability function is as follows:(20)Bel′A=∑B⊆Am′A∀A⊆Θ.Fourthly,mi′Ak and m′Θ are integrated into a new formula according to formula (10).


### 3.3. Design of Network Information Security Monitoring System Based on Big Data Era

The design of the network information security monitoring system based on the era of big data selects the organizational architecture. The development mode of the system isBrower/Server. The evidence theory proposed in this study is used as a system security assessment system. The system structure is divided into two major components, namely, the system control center and the system exploration engine. Its composition and network access method are shown in Figure 4.Figure 4
Composition and access method of network information security monitoring system.The network information security monitoring system in this study is simplified and integrated on the basis of the previous system. It also optimizes the performance of the system on the basis of ensuring practicality. It mainly completes the capture of data packets in the network, analysis of packet protocols, recovery of application protocols, and detection and identification of network attacks and then records alarms in the database, with log and audit functions.The control center is not restricted by the operating system. It has corresponding configuration, management, and operation functions. During operation, it can access the interface of the control center through the management host.The system adopts the modular design idea and divides the whole system into five modules: intrusion detection, data restoration, log audit management, control center, and database management, as shown in Figure5.Figure 5
Functional module structure of network information security monitoring system.Figure5 is a modular network information security monitoring system. When the system is working, it completes related functions by calling related threads and functions and stores the generated data in the database module. Then, the module configures, reads, stores, and queries the three modules accordingly, presenting the data in a visual form.The database in the network information security monitoring system consists of four distributions, namely, defense, revert, sysfog, and mymember.In the database of the first part, there are nine data tables in total, and the detailed information of each sub-table is shown in Table1.Table 1
Data table in defense database.
SequenceData sheetFeatures1tcphdrStore TCP header-related fields2udphdrStore UDP header-related fields3icmphdrStore ICMP header-related fields4Icmp6hdrStore ICMPv6 header-related fields5iphdrStore IP header-related fields6Ip5hdrStore IPv6 header-related fields7dataStore data payload8signatureStore attack alarm information, attack type and attack level, and other information9secStore associated alarm informationIn the database of the second part, there are thirteen data tables in total, and the detailed information of each sub-table is shown in Table2.Table 2
Packet inform package info datasheet.
SequenceField nameField typeDefaultsIllustrate1destmacChar (20)NullTarget MAC2sourcemacChar (20)NullSource MAC3destipChar (20)NullDestination IP address4sourceceipChar (20)NullSource IP address5destportChar (10)NullDestination port6sourceportChar (10)NullSource port7protocolChar (100)NullProtocol field8timeChar (20)NullTime9sizeChar (10)NullPackage length10urlChar (200)NullHTTP-URL11fromaddrChar (100)NullSMTP sender address12toaddrChar (100)NullSMTP recipient address13subjectChar (200)NullSMTP mail subjectIn the third part of the database, there are ten data tables in total, and the detailed information of each sub-table is shown in Table3.Table 3
Logs’ log audit data table.
SequenceField nameField typeDefaultsIllustrate1HostVarchar (32)NullUsername2FacilityVarchar (10)NullEquipment3PriorityVarchar (10)NullPriority4LevelVarchar (10)NullLevels of danger5TagVarchar (10)NullLogo6MsgtextDescription of the content of the log7Seqint (10)unsignedThe serial number of the storage log8ProgramVarchar (15)Null9DatedataNullStore the date the log was generated10TimetimeNullStore the log generation timeIn the database of the fourth part, there are five data tables in total, and the main information is shown in Table4.Table 4
User table user management data table.
SequenceField nameField typeDefaultsIllustrate1UsernameChar (8)Username2PasswordChar (64)NullPassword3EnableChar (1)0Normal and privileged user IDs4Login-mumint (11)0Number of logged in users5LockedChar (1)0Is the username available


## 3.1. Theoretical Basis of Network Information Security in the Era of Big Data

The theory of network information security is composed of the theoretical knowledge of various disciplines. It covers not only computer theory, communication theory, and Internet security theory but also theoretical knowledge at the mathematical level, such as statistical analysis, linear programming, and applied mathematics. It is a comprehensive theory with diversified and multidirectional characteristics.


### 3.1.1. Definition of Network Information Security

Network information security, as the name suggests, refers to the security of information generated in the network environment. It includes both the equipment security that maintains the normal operation of the network environment and the data security that is communicated and transmitted in the network environment. From a macro-point of view, as long as the information and data in the network environment are private, effective, real, operable, and self-controllable, technology and basic theories belong to the field of network information security that needs to be analyzed and understood [9].


### 3.1.2. Characteristics of Network Information Security

With the derivative development of a number of emerging technologies such as Internet technology and communication technology, the market operation has been fully intelligent and informatized. While bringing more development opportunities and economic benefits, the contradiction of information security in the network environment has gradually emerged. In addition to the economic, construction, and political security of the past, information security in the network area is vital. From the general analysis, the characteristics of network information security are initially divided into three categories [10]:(1)
Vulnerability of network information securityThe network environment is a public space with a special nature. It was founded on the principle of openness and freedom, which is not only reflected in people’s behavior but also reflected in the borderless, distanceless, and unimpeded network environment. It greatly facilitates the sharing and utilization of information resources. Due to the neglect of network information security in the early network construction, the management level of the Internet lags behind the application, so the development of the Internet is in a state of borderless in most cases. The vulnerability of network information security is mainly reflected in all aspects of design, implementation, and maintenance. The design stage serves a small number of trusted users and does not fully consider the threat factors of information security. It is impossible to achieve a flawless prevention and control design. This makes the operation of the entire environment hide huge security holes in practical applications. When purifying and repairing the network environment, due to the different functions and audiences of various software packages, and the environment itself is very complex, factors that threaten the security of network information also emerge one after another. Even though the network has been equipped with many defense means and facilities in the theoretical stage of its creation, in the actual network operation there will still be objective limitations, such as insufficient technical support or the impact of new intrusion methods. Under such a situation, every tiny flaw in security protection may cause each network node to suffer from information intrusion and attack and cause serious accidents such as data leakage, network failure, and equipment damage.(2)
Suddenness of network information securityThe transmission of network information requires the support of computers and other equipment and technologies. The security of network information is also affected by its characteristics. The suddenness of network information security refers to the internal operation failure caused by the invasion of foreign computer viruses. Such failures are often immediate, sudden, and extensive. At this stage, the definition of the concept and scope of computer viruses is a series of malicious codes that can be reproduced and reproduced in network systems, which are artificial, intentional, and aimed at destroying network information security. Attacks of such malicious code are usually unpredictable and sudden, which can cause extensive damage to network information, data, and files.(3)
Global nature of network information securityThe sharing and circulation of network information can be carried out without hindrance, and such high efficiency has never been used in any previous era. Communication and interaction in the network environment make all countries in the world closely connected, and the global nature of network information security is gradually formed on this basis [11]. However, with the surge in the number of Internet users, the possible negative effects of communication and interaction in this public environment are also enormous. The global nature of network information security also means that if a link of network information security is attacked, it will lead to a “butterfly effect.” Therefore, only by strengthening international cooperation the security of network information can be better maintained.


## 3.1.1. Definition of Network Information Security

Network information security, as the name suggests, refers to the security of information generated in the network environment. It includes both the equipment security that maintains the normal operation of the network environment and the data security that is communicated and transmitted in the network environment. From a macro-point of view, as long as the information and data in the network environment are private, effective, real, operable, and self-controllable, technology and basic theories belong to the field of network information security that needs to be analyzed and understood [9].


## 3.1.2. Characteristics of Network Information Security

With the derivative development of a number of emerging technologies such as Internet technology and communication technology, the market operation has been fully intelligent and informatized. While bringing more development opportunities and economic benefits, the contradiction of information security in the network environment has gradually emerged. In addition to the economic, construction, and political security of the past, information security in the network area is vital. From the general analysis, the characteristics of network information security are initially divided into three categories [10]:(1)
Vulnerability of network information securityThe network environment is a public space with a special nature. It was founded on the principle of openness and freedom, which is not only reflected in people’s behavior but also reflected in the borderless, distanceless, and unimpeded network environment. It greatly facilitates the sharing and utilization of information resources. Due to the neglect of network information security in the early network construction, the management level of the Internet lags behind the application, so the development of the Internet is in a state of borderless in most cases. The vulnerability of network information security is mainly reflected in all aspects of design, implementation, and maintenance. The design stage serves a small number of trusted users and does not fully consider the threat factors of information security. It is impossible to achieve a flawless prevention and control design. This makes the operation of the entire environment hide huge security holes in practical applications. When purifying and repairing the network environment, due to the different functions and audiences of various software packages, and the environment itself is very complex, factors that threaten the security of network information also emerge one after another. Even though the network has been equipped with many defense means and facilities in the theoretical stage of its creation, in the actual network operation there will still be objective limitations, such as insufficient technical support or the impact of new intrusion methods. Under such a situation, every tiny flaw in security protection may cause each network node to suffer from information intrusion and attack and cause serious accidents such as data leakage, network failure, and equipment damage.(2)
Suddenness of network information securityThe transmission of network information requires the support of computers and other equipment and technologies. The security of network information is also affected by its characteristics. The suddenness of network information security refers to the internal operation failure caused by the invasion of foreign computer viruses. Such failures are often immediate, sudden, and extensive. At this stage, the definition of the concept and scope of computer viruses is a series of malicious codes that can be reproduced and reproduced in network systems, which are artificial, intentional, and aimed at destroying network information security. Attacks of such malicious code are usually unpredictable and sudden, which can cause extensive damage to network information, data, and files.(3)
Global nature of network information securityThe sharing and circulation of network information can be carried out without hindrance, and such high efficiency has never been used in any previous era. Communication and interaction in the network environment make all countries in the world closely connected, and the global nature of network information security is gradually formed on this basis [11]. However, with the surge in the number of Internet users, the possible negative effects of communication and interaction in this public environment are also enormous. The global nature of network information security also means that if a link of network information security is attacked, it will lead to a “butterfly effect.” Therefore, only by strengthening international cooperation the security of network information can be better maintained.


## 3.2. Technical Basis of Network Information Security Monitoring System in the Era of Big Data

The network information security monitoring system is a subsystem built inside the network system that can realize real-time monitoring. Its main function is to maintain network information security and stabilize the safe operation of the network environment. It mainly monitors the nodes of each data packet in the network environment and restores them effectively. It can also interpret and analyze various application software packages in the network system, which will detect software and data information with higher security risks to prevent the occurrence or spread of information attacks in time [12].The network information security monitoring system should observe the information, data, and files generated in the network environment in real time. The system then intercepts incoming information and responds to and handles threats that can cause system failure and paralysis. Finally, the observation records and identification records are stored in an independent data repository, and the operation log of the computer system is supervised and reviewed to ensure that the equipment is in a stable and safe state. It provides a solid barrier for the normal operation and circulation of the network environment and network information [13]. Therefore, intrusion detection technology, log review technology, and security risk assessment are the technical basis of network information security monitoring system.


### 3.2.1. Intrusion Detection Technology

Intrusion detection technology refers to a technology that collects several important information and data in an organized manner within a computer network and interprets and analyzes them according to certain requirements and standards [14]. Through such technology, the abnormal factors or the factors that violate the safety management rules and regulations established by the system are monitored and identified. It mainly analyzes the node status of each data packet in depth by monitoring the initial information and data generated in the network environment and automatically matches and identifies it with the characteristics and symbols of foreign intrusion attacks. If the network environment and network information are abnormal, it will immediately enter the early warning state. Intrusion detection technology is generally only used for abnormal identification inside computer systems and network systems, but from a higher level, this kind of identification is also carried out for information systems, and intrusion detection technology can identify malicious attacks and illegal intrusions suffered by information systems.According to the source of network information, the composition of the detection system, and the specific methods used for detection, the intrusion detection system is also divided into different categories. As shown in Figure1, this study mainly analyzes the three most representative categories.(1)
Host-Based Intrusion Detection System: this type of intrusion detection system is carried out by examining the logs of the internal operation of the computer system. When the computer system is in normal operation, it will monitor the network environment and the operation status of network information in real time. Then, it will form data records and store them in the log. The intrusion detection system examines these logs to identify malicious attacks and illegal intrusions. Its core purpose is to intercept the further expansion of the intrusion behavior based on the detailed analysis of the log after the intrusion behavior has a certain impact on the network information, preventing more serious consequences. The response time of the system is related to the log review time. The disadvantage of host-based intrusion detection systems is that they cannot effectively monitor in real time.(2)
Network-Based Intrusion Detection System: this type of intrusion detection system uses the status of the initial data packet as the identification standard. It compares the subsequent running state of the system with the initial state and judges whether the system is in an abnormal state by comparing the rules and sequences in the result. The network-based intrusion detection system is mainly used to identify phenomena such as pattern anomalies, sequence anomalies, and frequency anomalies, and it can also be used to identify low-level time correlations in the network.(3)
Hybrid Intrusion Detection System: this type of system is a combination of the first two intrusion detection systems. Therefore, it has the characteristics and functions of both a military intrusion detection system and a network intrusion detection system. It is the most common method in the application of intrusion detection technology.Figure 1
Instruction detection system classification.


### 3.2.2. Computer System Log

To prevent the information and data possessed by the computer system from being damaged, the computer usually records the state of resources in real time through logs and records and saves every operation and change in the system. Then, the computer will sort them according to the time before and after [15]. These records are important for detecting and identifying whether the system is in an abnormal state. Each event independently forms a type of log, and each type of log forms a log file according to certain rules. In general, log files are directly viewable by system administrators. The log mainly contains the main content of the event, the date of occurrence, and other important information. As shown in Figure 2, it records and saves valuable and meaningful information for various application software, databases, firewalls, and other important components existing in the computer, to monitor and protect the system. The information in the log file has the following functions: identifying the means and scope of intrusion, recording malicious attack information and forming reports, and protecting the security of system resources.Figure 2
Internal and external structure of the computer.


### 3.2.3. Network Information Security Assessment Technology

This study uses the evidence theory in one of the big data technology theories to analyze the network information security assessment technology [16]. Evidence theory refers to the real and credible scene environment and objective attributes of things that need to be understood when analyzing tasks, which can be obtained through relevant theories, indirect experience, and actual observations, as shown in Figure 3.Figure 3
Way to obtain credible number in evidence theory.Suppose there is a proposition, for this proposition, a set of possibilities that can be understood and predicted will be formed, which is characterized byΘ. In this proposition, any proposition that one considers corresponds to a subset of the set. The set Θ is also a set of identification frameworks. The generation and construction of sets are entirely dependent on people’s thinking ability and cognitive scope.Assume the following formula [17]:(1)Θ=θ1,θ2.Then, there are power sets ofΘ as follows [18]:(2)2θ=∅,Θ,θ1θ2.Then,m: let Θ be the recognition frame, if the mass function: 2Θ⟶0,1 can be implemented [19]:(3)m∅=0,(4)∑A⊆ΘmA=1.In formulas (3) and (4), m is the basic credibility assignment function in Θ. In the range of A⊆Θ, mA represents the basic credibility of A, which refers to the derivation of evidence. Its derivative combination is called the nucleus. In the m function, mΘ points to m and no subset is given. No hint is given, so this can only be used to replace the information that is not yet known.Bel: let Θ be the recognition frame, and let m: 2Θ⟶0,1 be the basic credibility assignment function on Θ. Bel:2Θ⟶0,1 can be achieved as follows [20]:(5)BelA=∑B⊆AmA.Then,Bel can be regarded as the reliability function of Θ. The definition of reliability function is the correlation function with basic reliability.The basic credibility is assigned as follows:(6)mΘ=1,mA=0A≠Θ.The result of the confidence function is the simplest. At this time,(7)BelΘ=1.WhenA≠Θ,(8)BelA=0.This confidence function becomes the null confidence function. The null confidence function is mainly suitable for situations without any evidence.LetBel1 and Bel2 be the two reliability functions in the same Θ, and then, m1 and m2 represent the respective basic reliability distribution functions of the two functions.If(9)K=∑Ai∩Bj=∅m1Aim2Bj<1,then these two terms can be combined. The formed m: 2Θ⟶0,1 satisfies the following formula:(10)mA=0,A=∅,∑Ai∩Bj=Am1Aim2Bj1−K,A≠∅.1/1−K is treated as a normalizing factor whose main purpose is to prevent the confidence that ∅ is set to be nonzero when normalizing.Bel1, Bel2, …, Beln are set as the reliability function in the same 2Θ, and then, such a collection can be expressed as follows [21]:(11)Bel1⊕Bel2⊕Bel3⊕…⊕Beln.Ifm1, m2, …, mn represent the basic trustworthy distribution functions of Bel1, Bel2, …, Beln, respectively, the evidence combination rule can be expressed as follows:(12)m=m1⊕m2⊕m3⊕…⊕mn,⊕ in formula (12) refers to the direct sum, which is the final conclusion obtained through the analysis of the aggregated evidence. In the program of set construction, although it is not closely related to the order, it also achieves the requirement of associative rate.To avoid contradictions, the corresponding weights are set in each evidence set. The evidence set can be expressed by the following formula [22]:(13)E=E1,E2,…,En.The weight coefficient ofEi is ωi. Then, all the weight coefficients construct the weight vector of the evidence as follows:(14)W=ω1,ω2,…,ωn.It satisfiesωi∈0,1 and ∑i=1nωi=1. The weight factor reflects the importance of evidence in the synthesis process.Firstly, it is necessary to set the initial reliability value for any proposition inΘ, and then, the corresponding vector, W=ω1,ω2,…ωn, is set.Secondly, the vector maximum is set to be(15)ωmax=maxω1,ω2,…ωn.Relative weight vector can be obtained as follows:(16)W’=ω1,ω2,…,ωnωmax.After gettingW’, the discount rate of the initial reliability value is calculated through(17)αi0≤αi≤1,1−αi=ωiωmax,i=1,2,…n.Thirdly, according to formulas (18) and (19), the initial reliability value of each proposition is correspondingly changed by αi, and the distribution function of the changed reliability value is as follows:(18)mi′Ak=1−αimiAk,(19)m′Θ=1−αimΘ+αi.In formulas:k=1,2,…di, di—the number of non-Θ basic credibility in the identification framework provided by evidence Ei.The improved reliability function is as follows:(20)Bel′A=∑B⊆Am′A∀A⊆Θ.Fourthly,mi′Ak and m′Θ are integrated into a new formula according to formula (10).


## 3.2.1. Intrusion Detection Technology

Intrusion detection technology refers to a technology that collects several important information and data in an organized manner within a computer network and interprets and analyzes them according to certain requirements and standards [14]. Through such technology, the abnormal factors or the factors that violate the safety management rules and regulations established by the system are monitored and identified. It mainly analyzes the node status of each data packet in depth by monitoring the initial information and data generated in the network environment and automatically matches and identifies it with the characteristics and symbols of foreign intrusion attacks. If the network environment and network information are abnormal, it will immediately enter the early warning state. Intrusion detection technology is generally only used for abnormal identification inside computer systems and network systems, but from a higher level, this kind of identification is also carried out for information systems, and intrusion detection technology can identify malicious attacks and illegal intrusions suffered by information systems.According to the source of network information, the composition of the detection system, and the specific methods used for detection, the intrusion detection system is also divided into different categories. As shown in Figure1, this study mainly analyzes the three most representative categories.(1)
Host-Based Intrusion Detection System: this type of intrusion detection system is carried out by examining the logs of the internal operation of the computer system. When the computer system is in normal operation, it will monitor the network environment and the operation status of network information in real time. Then, it will form data records and store them in the log. The intrusion detection system examines these logs to identify malicious attacks and illegal intrusions. Its core purpose is to intercept the further expansion of the intrusion behavior based on the detailed analysis of the log after the intrusion behavior has a certain impact on the network information, preventing more serious consequences. The response time of the system is related to the log review time. The disadvantage of host-based intrusion detection systems is that they cannot effectively monitor in real time.(2)
Network-Based Intrusion Detection System: this type of intrusion detection system uses the status of the initial data packet as the identification standard. It compares the subsequent running state of the system with the initial state and judges whether the system is in an abnormal state by comparing the rules and sequences in the result. The network-based intrusion detection system is mainly used to identify phenomena such as pattern anomalies, sequence anomalies, and frequency anomalies, and it can also be used to identify low-level time correlations in the network.(3)
Hybrid Intrusion Detection System: this type of system is a combination of the first two intrusion detection systems. Therefore, it has the characteristics and functions of both a military intrusion detection system and a network intrusion detection system. It is the most common method in the application of intrusion detection technology.Figure 1
Instruction detection system classification.


## 3.2.2. Computer System Log

To prevent the information and data possessed by the computer system from being damaged, the computer usually records the state of resources in real time through logs and records and saves every operation and change in the system. Then, the computer will sort them according to the time before and after [15]. These records are important for detecting and identifying whether the system is in an abnormal state. Each event independently forms a type of log, and each type of log forms a log file according to certain rules. In general, log files are directly viewable by system administrators. The log mainly contains the main content of the event, the date of occurrence, and other important information. As shown in Figure 2, it records and saves valuable and meaningful information for various application software, databases, firewalls, and other important components existing in the computer, to monitor and protect the system. The information in the log file has the following functions: identifying the means and scope of intrusion, recording malicious attack information and forming reports, and protecting the security of system resources.Figure 2
Internal and external structure of the computer.


## 3.2.3. Network Information Security Assessment Technology

This study uses the evidence theory in one of the big data technology theories to analyze the network information security assessment technology [16]. Evidence theory refers to the real and credible scene environment and objective attributes of things that need to be understood when analyzing tasks, which can be obtained through relevant theories, indirect experience, and actual observations, as shown in Figure 3.Figure 3
Way to obtain credible number in evidence theory.Suppose there is a proposition, for this proposition, a set of possibilities that can be understood and predicted will be formed, which is characterized byΘ. In this proposition, any proposition that one considers corresponds to a subset of the set. The set Θ is also a set of identification frameworks. The generation and construction of sets are entirely dependent on people’s thinking ability and cognitive scope.Assume the following formula [17]:(1)Θ=θ1,θ2.Then, there are power sets ofΘ as follows [18]:(2)2θ=∅,Θ,θ1θ2.Then,m: let Θ be the recognition frame, if the mass function: 2Θ⟶0,1 can be implemented [19]:(3)m∅=0,(4)∑A⊆ΘmA=1.In formulas (3) and (4), m is the basic credibility assignment function in Θ. In the range of A⊆Θ, mA represents the basic credibility of A, which refers to the derivation of evidence. Its derivative combination is called the nucleus. In the m function, mΘ points to m and no subset is given. No hint is given, so this can only be used to replace the information that is not yet known.Bel: let Θ be the recognition frame, and let m: 2Θ⟶0,1 be the basic credibility assignment function on Θ. Bel:2Θ⟶0,1 can be achieved as follows [20]:(5)BelA=∑B⊆AmA.Then,Bel can be regarded as the reliability function of Θ. The definition of reliability function is the correlation function with basic reliability.The basic credibility is assigned as follows:(6)mΘ=1,mA=0A≠Θ.The result of the confidence function is the simplest. At this time,(7)BelΘ=1.WhenA≠Θ,(8)BelA=0.This confidence function becomes the null confidence function. The null confidence function is mainly suitable for situations without any evidence.LetBel1 and Bel2 be the two reliability functions in the same Θ, and then, m1 and m2 represent the respective basic reliability distribution functions of the two functions.If(9)K=∑Ai∩Bj=∅m1Aim2Bj<1,then these two terms can be combined. The formed m: 2Θ⟶0,1 satisfies the following formula:(10)mA=0,A=∅,∑Ai∩Bj=Am1Aim2Bj1−K,A≠∅.1/1−K is treated as a normalizing factor whose main purpose is to prevent the confidence that ∅ is set to be nonzero when normalizing.Bel1, Bel2, …, Beln are set as the reliability function in the same 2Θ, and then, such a collection can be expressed as follows [21]:(11)Bel1⊕Bel2⊕Bel3⊕…⊕Beln.Ifm1, m2, …, mn represent the basic trustworthy distribution functions of Bel1, Bel2, …, Beln, respectively, the evidence combination rule can be expressed as follows:(12)m=m1⊕m2⊕m3⊕…⊕mn,⊕ in formula (12) refers to the direct sum, which is the final conclusion obtained through the analysis of the aggregated evidence. In the program of set construction, although it is not closely related to the order, it also achieves the requirement of associative rate.To avoid contradictions, the corresponding weights are set in each evidence set. The evidence set can be expressed by the following formula [22]:(13)E=E1,E2,…,En.The weight coefficient ofEi is ωi. Then, all the weight coefficients construct the weight vector of the evidence as follows:(14)W=ω1,ω2,…,ωn.It satisfiesωi∈0,1 and ∑i=1nωi=1. The weight factor reflects the importance of evidence in the synthesis process.Firstly, it is necessary to set the initial reliability value for any proposition inΘ, and then, the corresponding vector, W=ω1,ω2,…ωn, is set.Secondly, the vector maximum is set to be(15)ωmax=maxω1,ω2,…ωn.Relative weight vector can be obtained as follows:(16)W’=ω1,ω2,…,ωnωmax.After gettingW’, the discount rate of the initial reliability value is calculated through(17)αi0≤αi≤1,1−αi=ωiωmax,i=1,2,…n.Thirdly, according to formulas (18) and (19), the initial reliability value of each proposition is correspondingly changed by αi, and the distribution function of the changed reliability value is as follows:(18)mi′Ak=1−αimiAk,(19)m′Θ=1−αimΘ+αi.In formulas:k=1,2,…di, di—the number of non-Θ basic credibility in the identification framework provided by evidence Ei.The improved reliability function is as follows:(20)Bel′A=∑B⊆Am′A∀A⊆Θ.Fourthly,mi′Ak and m′Θ are integrated into a new formula according to formula (10).


## 3.3. Design of Network Information Security Monitoring System Based on Big Data Era

The design of the network information security monitoring system based on the era of big data selects the organizational architecture. The development mode of the system isBrower/Server. The evidence theory proposed in this study is used as a system security assessment system. The system structure is divided into two major components, namely, the system control center and the system exploration engine. Its composition and network access method are shown in Figure 4.Figure 4
Composition and access method of network information security monitoring system.The network information security monitoring system in this study is simplified and integrated on the basis of the previous system. It also optimizes the performance of the system on the basis of ensuring practicality. It mainly completes the capture of data packets in the network, analysis of packet protocols, recovery of application protocols, and detection and identification of network attacks and then records alarms in the database, with log and audit functions.The control center is not restricted by the operating system. It has corresponding configuration, management, and operation functions. During operation, it can access the interface of the control center through the management host.The system adopts the modular design idea and divides the whole system into five modules: intrusion detection, data restoration, log audit management, control center, and database management, as shown in Figure5.Figure 5
Functional module structure of network information security monitoring system.Figure5 is a modular network information security monitoring system. When the system is working, it completes related functions by calling related threads and functions and stores the generated data in the database module. Then, the module configures, reads, stores, and queries the three modules accordingly, presenting the data in a visual form.The database in the network information security monitoring system consists of four distributions, namely, defense, revert, sysfog, and mymember.In the database of the first part, there are nine data tables in total, and the detailed information of each sub-table is shown in Table1.Table 1
Data table in defense database.
SequenceData sheetFeatures1tcphdrStore TCP header-related fields2udphdrStore UDP header-related fields3icmphdrStore ICMP header-related fields4Icmp6hdrStore ICMPv6 header-related fields5iphdrStore IP header-related fields6Ip5hdrStore IPv6 header-related fields7dataStore data payload8signatureStore attack alarm information, attack type and attack level, and other information9secStore associated alarm informationIn the database of the second part, there are thirteen data tables in total, and the detailed information of each sub-table is shown in Table2.Table 2
Packet inform package info datasheet.
SequenceField nameField typeDefaultsIllustrate1destmacChar (20)NullTarget MAC2sourcemacChar (20)NullSource MAC3destipChar (20)NullDestination IP address4sourceceipChar (20)NullSource IP address5destportChar (10)NullDestination port6sourceportChar (10)NullSource port7protocolChar (100)NullProtocol field8timeChar (20)NullTime9sizeChar (10)NullPackage length10urlChar (200)NullHTTP-URL11fromaddrChar (100)NullSMTP sender address12toaddrChar (100)NullSMTP recipient address13subjectChar (200)NullSMTP mail subjectIn the third part of the database, there are ten data tables in total, and the detailed information of each sub-table is shown in Table3.Table 3
Logs’ log audit data table.
SequenceField nameField typeDefaultsIllustrate1HostVarchar (32)NullUsername2FacilityVarchar (10)NullEquipment3PriorityVarchar (10)NullPriority4LevelVarchar (10)NullLevels of danger5TagVarchar (10)NullLogo6MsgtextDescription of the content of the log7Seqint (10)unsignedThe serial number of the storage log8ProgramVarchar (15)Null9DatedataNullStore the date the log was generated10TimetimeNullStore the log generation timeIn the database of the fourth part, there are five data tables in total, and the main information is shown in Table4.Table 4
User table user management data table.
SequenceField nameField typeDefaultsIllustrate1UsernameChar (8)Username2PasswordChar (64)NullPassword3EnableChar (1)0Normal and privileged user IDs4Login-mumint (11)0Number of logged in users5LockedChar (1)0Is the username available


## 4. Test of Computer Network Information Security Monitoring System Based on Big Data Era

This document tests the performance and stability of a big data time-based computer information security monitoring system. It has been compared to a traditional computer information security monitoring system to ensure its effectiveness. The test environment is shown in Figure6.Figure 6
Network information security monitoring system test environment.The attack software required for the test is shown in Table5.Table 5
Attack software required for testing.
SequenceSoftwareSpecific classification1Network information scanning toolHping, Nmap2Distributed denial of service toolWinNuke, Land, Jolt3Database attack toolMySQL4Mail server attack toolImapd exploit5FTP server attack toolServ-U attack6We server attack toolHttpdThe performance test mainly examines the attack detection rate, false-positive rate, false-negative rate, average response time, and fault recovery time of the computer network information security monitoring system in different network environments. The test results are shown in Figure7.Figure 7
System attack detection rate test. (a) Detection rate under the background flow of 10M. (b) Detection rate under the background flow of 60M.
(a)(b)As can be seen from Figure7, under the network environment with the background traffic of 10M, the detection rate of the computer network information security monitoring system proposed in this study has reached more than 99% under different numbers of data packet nodes, while the average detection rate of the traditional computer network information security monitoring system under different numbers of data packet nodes is 92.24%. In a network environment with a background traffic of 60M, due to the increased complexity of the environment and the rapid increase in factors that disturb information security, the attack detection rate of the system will decrease. The detection rate of the computer network information security monitoring system proposed in this study is 83.79% under different numbers of data packet nodes, while the attack detection rate of the traditional computer network information security monitoring system is 77.19%. Based on these data, the sensitivity of the system in this study is still relatively ideal.It can be seen from Figure8 that the false alarm rate of the computer network information security monitoring system proposed in this study is low under the different numbers of data packet nodes in the same network environment, and the test average is only 3.12%. However, the average false alarm rate of the traditional system reaches 6.04%, which is far from the practical application standard. In the test of the false-negative rate of the system against external attacks, it can be seen that the average false-negative rate of the system in this study is only 6.10% under different numbers of data packet nodes, which is 3.11% lower than the traditional computer network information security monitoring system, showing its superior performance in monitoring and defending against information attacks.Figure 8
System false-positive rate and false-negative rate test. (a) System false alarm rate test. (b) System false-negative rate test.
(a)(b)As can be seen from Figure9, the average response time of the network information security monitoring system designed in this study based on the big data era is 0.36 seconds, and the average response time of the traditional network information security monitoring system is 0.592. In the modern society with sufficient information, the system proposed in this study can effectively adapt to the ever-changing network environment, and it also has the characteristics of real time. In the face of node paralysis and failure caused by attacks, the fault recovery time range of the network information security monitoring system proposed in this study is within 2 minutes, and the traditional monitoring system failure recovery time range is 2-3 minutes. This shows that the system in this study can provide the optimal solution in time according to the characteristics of external attack factors, and it can achieve fast and effective maintenance.Figure 9
System response time and failure recovery time testing. (a) System response time. (b) Failure recovery time.
(a)(b)It can be seen from Figure10 that in the stability test of the network information security monitoring system, the stability test values of the system in this study under different numbers of data packet nodes are 88.36%, 92.61%, 93.34%, 95.22%, and 95.56%, respectively. The test mean is 93.02%. The stability test values of the traditional network information security monitoring system under different numbers of data packet nodes are 81.17%, 83.42%, 86.31%, 86.92%, and 88.16%, respectively. The test mean is 85.20%. Compared with the test average of this article, it is 7.82% lower. It indicates that the network information security monitoring system designed in this study based on the era of big data performs well in terms of operational stability. There is no abnormal situation caused by internal and external reasons such as the network environment or the system’s own equipment.Figure 10
System stability test. (a) System stability test results in this study. (b) Traditional system stability test results.
(a)(b)


## 5. Conclusions

Maintaining network information security is the primary task of realizing sustainable development of computer technology. In the era of big data, establishing and improving the network information security monitoring system have great practical significance for social development. Based on the information monitoring theory and technology in the era of big data, this study designs a network information security monitoring system. The system can effectively adapt to the complex network environment and conduct real-time monitoring and defense against external information attacks. Meanwhile, it alleviates the problem of inaccurate identification caused by system performance defects at the existing stage, which has a high detection rate. Although this study has carried out in-depth research on the network information security monitoring system based on the era of big data, there are still many deficiencies. The depth and breadth of the research in this study are not enough. In the process of this research, the selection and acquisition of experimental data were carried out under absolutely ideal conditions, and the integrity and validity were not enough. Some interference factors involved in the test process were not considered. The research of the academic level is also limited. The research on network information security maintenance is still in the preliminary stage. In the future work, the quality of research work will be continuously improved from more perspectives based on the existing technology and level.



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*Source: 3170164-2022-11-18.xml*