Patent Publication Number: US-2021182710-A1

Title: Method and system of user identification by a sequence of opened user interface windows

Description:
CROSS-REFERENCE 
     The present application is a Continuation of International Application No. PCT/RU2019/000232, entitled “IDENTIFYING A USER FROM THE SEQUENCE OF WINDOWS OPENED ON A USER INTERFACE,” filed on Apr. 10, 2019, the entirety of which is incorporated herein by reference. 
    
    
     FIELD 
     The present technology broadly relates to the field of cybersecurity; and, in particular, to a method and system of user identification by a sequence of opened user interface windows. 
     BACKGROUND 
     Protecting information from unauthorized access is becoming increasingly important. Methods used by violators to gain unauthorized access to other people&#39;s data, such as that of people&#39;s funds, secured, for example, by a protected resource, may include obtaining user credentials (usually a login and password) of a given user and then connecting to the protected resource using these credentials. In this respect, regardless of a particular way of gaining access to the user credentials (use of keyloggers, remote connection to a computer of the given user, theft of a mobile device not protected by password, as well as other methods, and the like), the violator&#39;s actions may not be distinguished from the actions of the given (that is, legitimate) user, under whose credentials the violator entered the protected resource. 
     Certain prior art approaches have been proposed for tackling the above-identified technical problem of user identification. 
     United States Patent Application Publication No.: 2017/032,250-A1 published on Feb. 2, 2017 and entitled “Machine Status and User Behavior Analysis System” discloses machine status and user behavior analysis system includes a detection side device and an analysis side device. The detection side device is electrically connected with the machine. The detection side device includes a data retrieving module, a sensing module, and a data processing module. The data retrieving module retrieves internal data of the machine. The sensing module senses the status of the machine to obtain sensed data. The data processing module processes the internal data of the machine and the sensed data to classify the internal data of the machine and the sensed data into machine status data and operation condition data. The analysis side device is wirelessly connected with the detection side device to receive the machine status data and the operation condition data. The analysis side device includes a data recognizing module which recognizes the machine status data to find a machine abnormal status and recognizes the operation condition data to find user behavior. 
     Chinese Patent No.: 106,355,450-B issued on Apr. 24, 2020 and entitled “User Behavior Analysis System and Method” discloses a user behavior analysis system and method based on a mobile network, which comprises the following steps: the system comprises a pushing module, a display module and a display module, wherein the pushing module is used for pushing promotion information containing one or more pages, and the one or more pages contain one or more interactive plug-ins; the collection module is used for collecting the interaction information of the user through the interaction plug-in; a parsing module for determining one or more tags of a repository corresponding to the interaction information, the repository associating a respective identifier with a respective tag, the identifier representing all or part of the data of the corresponding interaction information; the query module is used for receiving query requirements, determining one or more tags related to the promotion information, acquiring corresponding identifiers related to the tags, and outputting interactive information corresponding to the identifiers and user information corresponding to the interactive information. The invention can intelligently analyze a large amount of collected user behavior information and find out the target user matched with the popularization information. 
     Chinese Patent No.: 106,202,482-B issued on Feb. 7, 2020 and entitled “A Kind of Web Information Flow Method and System Based on User Behavior Analysis” discloses a kind of web information flow method and system based on user behavior analysis, including: collect user behavior data from electricity business&#39;s server; Described user behavior data is stored to distributed file system; Process described user behavior data by distributed algorithm, extract dimensional information, set up the user behavior analysis model corresponding with described dimensional information; By user behavior data described in described user behavior analysis model analysis, obtain the behavior common denominator data of each user, and optimize corresponding website according to described behavior common denominator data; Visible, in the present embodiment, storage and Computational frame based in a distributed manner, based on user behavior mining analysis platform, analyze user behavior, from data analysis, obtain user preference, web information flow rule and pattern, based on improving Consumer&#39;s Experience, make web information flow be truly realized and take from user and be used for user. 
     Russian Patent No: 2,649,793-C2 issued on Apr. 4, 2018, assigned to Group-IB Ltd, and entitled “Method and System for Detecting Remote Access During Activity on The Pages of a Web Resource” discloses a method comprising receiving data representative of a periodicity of a computer mouse movement events; generating a statistical model, the statistical model representative of a typical periodicity of the computer mouse movement events associated with a legitimate user of the electronic device; receiving an indication of computer mouse movement events from the electronic device during a browsing session of the web resource; comparing a periodicity of the computer mouse movement events with the statistical model; in response to detecting a deviation in computer mouse movement events, generating a notification determining a presence of a remote connection to the browsing session; transmitting the notification to an entity associated with the web resources. 
     SUMMARY 
     It is an object of the present technology to improve effectiveness of certain methods present in the prior art. 
     Broadly speaking, certain non-limiting embodiments of the present technology are directed to methods and systems for user identification of a user in a computer system by sequence of user interface windows opened by the user therein. More specifically, the methods and systems described herein are directed to determining specific patterns of opening, by the user, user interface windows in the computer system, which may be indicative of specific behavioral features of the user interacting with the computer system. 
     Thus, the present methods and systems, unlike those noted in the prior art, may allow for protecting user&#39;s data in the computer system from remote attacks, such as accessing the computer system using the user credentials from a remote malicious server, and the like. 
     More specifically, in accordance with a first broad aspect of the present technology, there is provided a method of user identification of a user in a computer system. The method is executable by a computing device associated with the computer system. The method comprises: obtaining, by the computing device, a user identifier associated with the user in the computer system; assigning, by the computing device, a respective window identifier to each user interface window opened by the user on the computing device; during a pre-determined number of working sessions of the user on the computing device, for a given working session of the pre-determined number of working sessions: storing a sequence of user interface windows opened by the user, the storing including, for a given user interface window of the sequence of user interface windows: storing a respective window identifier of the given user interface window and a respective timestamp indicative of an opening time of the given user interface window; identifying, within user interface windows opened over the pre-determined number of working sessions, at least one pattern including a pre-determined number of repetitive sequences of user interface windows opened by the user over the pre-determined number of working sessions; generating a set of parameters characterizing a time elapsed between a transition from a first user interface window to an other user interface window within the at least one pattern; using the set of parameters associated with the at least one pattern and the user identifier to train at least one classifier to identify the user by an in-use sequence of user interface windows opened therein. 
     In some implementations of the method, the method further comprises using the at least one classifier to identify the user in the computer system during an in-use session, the using comprising: receiving data of the in-use sequence of user interface windows including in-use user interface windows having been opened during the in-use session, wherein: each one of the in-use user interface windows is associated with a respective timestamp indicative of a time of opening thereof; applying the at least one classifier to the in-use sequence of the user interface windows to determine a likelihood parameter indicative of each of the in-use user interface windows having been opened by the user; in response to the likelihood parameter being lower than a pre-determined likelihood threshold, executing one or more pre-determined actions. 
     In some implementations of the method, the given user interface window is a web page. 
     In some implementations of the method, the at least one pattern has been selected as meeting pre-determined criteria. 
     In some implementations of the method, the pre-determined criteria is based on a trade-off between a pre-determined number of occurrences of the at least one pattern within the pre-determined number of working sessions and a pre-determined maximum possible length of the at least one pattern. 
     In some implementations of the method, the method further comprises assigning a weight value to the at least one pattern indicative of an effect of the at least one pattern on a final decision of the at least one classifier. 
     In some implementations of the method, the set of parameters further includes an averaged time elapsed between transitions from the first user interface window to the other user interface window over the pre-determined number of working sessions. 
     In some implementations of the method, the set of parameters further includes a variance value of time intervals elapsed between the transitions from the first user interface window to the other user interface window over the pre-determined number of working sessions. 
     In some implementations of the method, the set of parameters further includes a frequency of occurrence of the at least one pattern in the pre-determined number of working sessions of the user. 
     In some implementations of the method, a greater value of the frequency of occurrence has a greater effect on a final decision of the at least one classifier. 
     In some implementations of the method, training the at least one classifier is executed by applying one or more machine learning techniques. 
     In some implementations of the method, the at least one classifier comprises at least one of a probabilistic graphical model and a Support Vector Machine (SVM) classifier. 
     In accordance with a second broad aspect of the present technology, there is provided a system for user identification of a user. The system includes a computing device including a processor and a non-transitory computer-readable medium comprising instructions. The processor, upon executing the instructions, is configured to: obtain a user identifier associated with the user in the computer system; assign a respective window identifier to each user interface window opened by the user on the computing device; during a pre-determined number of working sessions of the user on the computing device, for a given working session of the pre-determined number of working sessions: store a sequence of user interface windows opened by the user including, for a given user interface window of the sequence of user interface windows: a respective window identifier of the given user interface window and a respective timestamp indicative of an opening time of the given user interface window; identify, within user interface windows opened over the pre-determined number of working sessions, at least one pattern including a pre-determined number of repetitive sequences of user interface windows opened by the user over the pre-determined number of working sessions; generate a set of parameters characterizing a time elapsed between a transition from a first user interface window to an other user interface window within the at least one pattern; use the set of parameters associated with the at least one pattern and the user identifier to train at least one classifier to identify the user by an in-use sequence of user interface windows opened therein. 
     In some implementations of the system, the processor is further configured to use the at least one classifier to identify the user in the computer system during an in-use session, by executing: receiving data of the in-use sequence of user interface windows including in-use user interface windows having been opened during the in-use session, wherein: each one of the in-use user interface windows is associated with a respective timestamp indicative of a time of opening thereof; applying the at least one classifier to the in-use sequence of the user interface windows to determine a likelihood parameter indicative of each of the in-use user interface windows having been opened by the user; in response to the likelihood parameter being lower than a pre-determined likelihood threshold, executing one or more pre-determined actions. 
     In some implementations of the system, the given user interface window is a web page. 
     In some implementations of the system, the at least one pattern has been selected as meeting pre-determined criteria. 
     In some implementations of the system, the computing device is an integral part of a remote banking service system. 
     In some implementations of the system, the computing device is an integral part of a website including a user authorization feature. 
     In some implementations of the system, the computing device is an integral part of a multiplayer computer game including a user authorization feature. 
     In some implementations of the system, the computing device is an integral part of a software and hardware system for collaborative work including a user authorization feature. 
     In the context of the present specification, unless expressly provided otherwise, a computer system may refer, but is not limited to, a “computing device”, an “electronic device”, an “operation system”, a “system”, a “computer-based system”, a “controller unit”, a “control device” and/or any combination thereof appropriate to the relevant task at hand. 
     In the context of the present specification, unless expressly provided otherwise, the expression “computer-readable medium” and “memory” are intended to include media of any nature and kind whatsoever, non-limiting examples of which include RAM, ROM, disks (CD-ROMs, DVDs, floppy disks, hard disk drives, etc.), USB keys, flash memory cards, solid state-drives, and tape drives. 
     In the context of the present specification, a “database” is any structured collection of data, irrespective of its particular structure, the database management software, or the computer hardware on which the data is stored, implemented or otherwise rendered available for use. A database may reside on the same hardware as the process that stores or makes use of the information stored in the database or it may reside on separate hardware, such as a dedicated server or plurality of servers. 
     In the context of the present specification, unless expressly provided otherwise, the words “first”, “second”, “third”, etc. have been used as adjectives only for the purpose of allowing for distinction between the nouns that they modify from one another, and not for the purpose of describing any particular relationship between those nouns. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Non-limiting embodiments of the present technology will be described with reference to the accompanying drawings, which are presented to explain the essence of the invention and in no way to limit the scope of the present technology, wherein: 
         FIG. 1  depicts a flow chart of a computer-implemented method of user identification of a user in a computing system by sequence of opened user interface windows, in accordance with certain non-limiting embodiments of the present technology; 
         FIG. 2  depicts a schematic diagram of an example computing environment configurable for execution the method of  FIG. 1 , in accordance with certain non-limiting embodiments of the present technology. 
     
    
    
     DETAILED DESCRIPTION 
     The following detailed description is provided to enable anyone skilled in the art to implement and use the non-limiting embodiments of the present technology. Specific details are provided merely for descriptive purposes and to give insights into the present technology, and in no way as a limitation. However, it would be apparent to a person skilled in the art that some of these specific details may not be necessary to implement certain non-limiting embodiments of the present technology. The descriptions of specific implementations are only provided as representative examples. Various modifications of these embodiments may become apparent to the person skilled in the art; the general principles defined in this document may be applied to other non-limiting embodiments and implementations without departing from the scope of the present technology. 
     Certain non-limiting embodiments of the present technology are directed to a computer-implemented method and system for user identification in a computer system by an opening sequence of user interface windows. 
     One of non-limiting example of the computer system described herein may include a remote banking service (RBS) system; however, in various non-limiting embodiments of the present technology, the computer system may also include, without limitation, online computer games, collaboration software, online store software, and the like. 
     According to certain non-limiting embodiments of the present technology, the computer system may include a computing environment, such as a computing device  200  described herein below with reference to  FIG. 2 . 
     Method 
     With reference to  FIG. 1 , there is depicted a flow chart diagram of a method  100  for user identification of the user in the computer system by a sequence of opened user interface windows, in accordance with certain non-limiting embodiments of the present technology. The method  100  may be executed by a processor  201  of the computing device  200 . 
     Step  102 : Obtaining, by the Computing Device, a User Identifier Associated with the User in the Computer System;
 
The method  100  commences at step ( 102 ) with the processor  201  being configured to obtain, for the computer system, a user identifier of the user. In some non-limiting embodiments of the present technology, the user identifier may have been predetermined based on user in the computer system including username and password.
 
     Further, in certain non-limiting embodiments of the present technology, the processor  201  may be configured to assign the user identifier to the user. 
     The method  100  thus proceeds to step  104 . 
     Step  104 : Assigning, by the Computing Device, a Respective Window Identifier to Each User Interface Window Opened by the User on the Computing Device 
     At step ( 104 ), in some non-limiting embodiments of the present technology, the processor  201  may be configured to assign a respective window identifier to each of user interface window that the user has opened on the computer system using the computing device  200 . 
     The method  100  thus proceeds to step  106 . 
     Step  106 : During a Pre-Determined Number of Working Sessions of the User on the Computing Device, for a Given Working Session of the Pre-Determined Number of Working Sessions: Storing a Sequence of User Interface Windows Opened by the User 
     At step ( 106 ) in some non-limiting embodiments of the present technology, in each working session of the user, the processor  201  may be configured to record and store a sequence of user interface windows opened by the user. More specifically, in this respect, for a given user interface window opened by the user, the processor  201  may be configured to obtain and store a respective window identifier associated therewith of the given window and a timestamp indicative of an opening time of given window. 
     Thus, at step ( 106 ), the processor  201  may be configured to aggregate, during a predetermined number of working sessions of the user in the computer system, data of a plurality of user interface windows opened by the user in the computer system. 
     The method  100  hence advances to step  108 . 
     Step  108 : Identifying, within User Interface Windows Opened Over the Pre-Determined Number of Working Sessions, at Least One Pattern Including a Pre-Determined Number of Repetitive Sequences of User Interface Windows Opened by the User Over the Pre-Determined Number of Working Sessions 
     Further, at step ( 108 ), according to certain non-limiting embodiments of the present technology, the processor  201  may be configured to identify, in the plurality of user interface windows opened by the user in the predetermined number of working sessions, at least pattern. According to some non-limiting embodiments of the present technology, the at least one pattern may include a pre-determined number of repetitive sequences of user interface windows opened by the user over the pre-determined number of working sessions. 
     The method  100  thus proceeds to step  110 . 
     Step  110 : Generating a Set of Parameters Characterizing a Time Elapsed Between a Transition from a First User Interface Window to an Other User Interface Window within the at Least One Pattern 
     Further, at step ( 110 ), the processor  201  may be configured to generate, for each user interface window of the at least one pattern, a set of parameters characterizing a time elapsed between a transitions, within the at least one pattern, from a given user interface window to an other user interface window. 
     Thus, according to certain non-limiting embodiments of the present technology, at step ( 110 ), the processor  201  may be configured to identify and store a plurality of patterns associated with the user; and based on associated sets of parameters determined for each pattern, the processor  201  may be configured to generate a training set of data to train at least one classifier to identify the user by an in-use sequence of visited pages. 
     The method  100  thus advances to step  112 . 
     Step  112 : Using the Set of Parameters Associated with the at Least One Pattern and the User Identifier to Train at Least One Classifier to Identify the User by an in-Use Sequence of User Interface Windows Opened Therein. 
     Finally, at step ( 112 ), according to certain non-limiting embodiments of the present technology, based on the training set of data, the processor  201  may be configured to train the at least one classifier to identify the user in the computer system by the in-use sequence of user interface windows opened during in-use working sessions. 
     In some non-limiting embodiments of the present technology, the method  100  can be implemented as an authorized remote access service including user interface windows or working zones in one complex user interface window further including a feature to switch between them (both windows and zones). 
     Below are given certain non-limiting examples of implementation of the above-described method  100 , in accordance with certain non-limiting embodiments of the present technology. 
     Example Implementations 
     In some non-limiting embodiments of the present technology, the method  100  can be implemented in the form of an Internet program (script), functioning on a website of a bank providing the RBS. 
     In other non-limiting embodiments of the present technology, the method  100  can be executed by a subsystem of the “thin client” of RBS, for example, an Internet application that runs on a user electronic device of the user including, for example, a smartphone, a mobile phone, etc., and exchanges data with a server of the bank on which the RBS system is installed and operates. 
     In yet other non-limiting embodiments of the present technology, the method  100  can be executed by a subsystem of a software and hardware complex operating in a cloud environment and exchanging data with “thin clients”, such as ATMs, and with a processing center of the bank. 
     In additional non-limiting embodiments of the present technology, the method  100  can be executed by distributed software and/or hardware system located on different Internet servers, for example, for the purpose of load distribution, and simultaneously serving multiple RBS channels belonging to different banks. 
     In other non-limiting embodiments of the present technology, the method  100  can be implemented in a program or service for collaboration, which includes authorized user access (for such programs or services, see ru.wikipedia.org/w/index.php?title=% D0%9F%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%BD%D0%BE%D0%B5%D0%BE%D0%B1%D0%B5%D1%81%D0%BF%D0%B5%D1%87%D0%B5%D0%BD%D0%B8%D0%B5%D1%81%D0%BE %D0%B2%D0%BC%D0%B5%D1%81%D1%82%D0%BD%D0%BE%D0%B9%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D1%8B&amp;oldid=80620207). In yet other non-limiting embodiments of the present technology, the method  100  can be implemented in a multiplayer computer game including a feature of authorization of users. 
     Below, the example implementation of the method  100  in the computer system including the RBS system will be described in greater detail, according to certain non-limiting embodiments of the present technology. As noted above, this implementation of the method  100  is not limiting. 
     In some non-limiting embodiments of the present technology, the user identifier is at least one combination of characters that may uniquely characterize a given user, such as the user. For example, the user identifier can be a hash function from a phone number of the electronic device from which the RBS is accessed. In other non-limiting embodiments of the present technology, the user identifier can be agent id (internal client identifier used in the banking system). In yet other non-limiting embodiments of the present technology, the user identifier can be a bank card number of the user, or a result of a biometric identification of the user or a hash function of such a result. 
     In some non-limiting embodiments of the present technology, the user identifier can be a value of a function of a set of information about the software and hardware configuration of a personal computer used by the user to access the RBS. 
     In yet other non-limiting embodiments of the present technology, to generate the user identifier, the processor  201  may be configured to apply a hash function to a character string obtained by concatenating identifiers obtained from the RBS. 
     Generally speaking, the user identifier may be encrypted on the RBS side; its decoding is not required for the implementation of the method  100 , and the way in which it was generated is not limited. Further, the user identifier can be unique and consistently reproducible during each session of accessing the RBS using the credentials (login and password) of the user. 
     For simplicity and clarity of further description, the user identifier may be represented as USER(i), where different values of i indicate different users. 
     Further, in some non-limiting embodiments of the present technology, the processor  201  may be configured to generate and assign the respective window identifier to the given user interface window. In some non-limiting embodiments of the present technology, the respective window identifier can include at least one combination of characters that is uniquely associated with the given user interface window. 
     For example, in those non-limiting embodiments of the present technology where the given user interface window is a web site page, the processor  201  can be configured to generate the respective window identifier by applying a hash function to an associated URL and/or to a title (a sequence of characters placed under the &lt;title&gt; tag) of the. In other non-limiting embodiments of the present technology, the given user interface window can be an interface element of a program running on the electronic device of the user and/or in the ATM. In this regard, the processor  201  can be configured to generate the respective window identifier by applying a hash function to a name of this interface element or its another designation used in the program. 
     Thus, in some non-limiting embodiments of the present technology, the processor  201  may be configured to generate the respective window identifier that can be unique within the framework of the RBS and consistently reproducible with each successful act of accessing the given interface window. 
     It yet additional non-limiting embodiments of the present technology, the processor  201  may be configured to generate respective window identifier by hashing a character string obtained by concatenating identifiers received from the RBS. 
     In those non-limiting embodiments of the present technology, where the given user interface window has several working areas, the processor  201  can be configured to generate the respective window identifier as an input focus—(see the following for more details: ru.wikipedia.org/w/index.php?title=%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D0%B5% D0%BB%D1%8C%D1%81%D0%BA%D0%B8%D0%B9%D0%B8%D0%BD%D1%82%D0%B5%D1%80%D1%84%D0%B5%D0%B9%D1%81)&amp;stable=1, i.e. some sequence of service characters generated by the program, which is associated with the given user interface window, and carrying information about which of the numerous interface elements of the program (buttons, pop-up lists, radio buttons, text input windows, etc.) is currently active and ready to take user commands. 
     Conversion of such a sequence into the respective window identifier can be performed, for example, by the processor  201  applying a hash function to the sequence of characters itself or by any other method. 
     Hereafter, the respective window identifier is indicated as PAGE(j), wherein a different j value points to a different user interface windows, or a different user interface elements in a user interface window, in those embodiments where the given user interface window has several working areas. 
     Further, in some non-limiting embodiments of the present technology, the processor  201  may be configured to obtain an additional identifier of the bank, with which the RBS is associated, or in other words, which is associated with the one or more USER(i); PAGE (j). 
     The additional identifier may be indicated as BANK(q); and in some non-limiting embodiments of the present technology, the additional identifier may be static, may be generated only once, when the RBS system of the bank has been configured and launched. For example, the additional identifier can be an SSL certificate that subscribes the sites of the bank, or a separate character string, for example, BANK(q)=SBERBANK, transferred from each bank&#39;s RBS. BANK(q) identifier is used for the primary sorting of information received by the RBS and for addressing the response signals of the RBS to the bank antifraud department. 
     According to certain non-limiting embodiments of the present technology, the processor  201  can be configured to receive the user identifier and the respective window identifier, USER(i); PAGE(j) from the RBS always in pairs and simultaneously, each accompanied by a timestamp. In fact, it may take some time between the receipt of the first and second identifiers, due to signal delays in the physical communication lines used by the RBS, but we neglect this time within the scope of the implementation of the claimed method, considering the receipt time of the last one of the identifiers to be the receipt time of the identifiers. 
     According to certain non-limiting embodiments of the present technology, the processor  201  can be configured to organize the received data in data sequences respectively associated with working sessions (S) of the user, as expressed by Equation (1) below: 
         S ={USER( i );PAGE(1); t   1 },{USER( i );PAGE(2), t   2 }, . . . {USER( i );PAGE( N ), t   N },  (1)
 
     wherein t 1  is a timestamp corresponding to an opening time of PAGE(1) user interface window by the USER(i) user, t 2  is a timestamp corresponding to an opening time of PAGE(2) user interface window by the same user, and so on. 
     As it can be appreciated, the user identifier in each pair is the same, i.e. a given working session is always associated with a specific user describing work thereof in the RBS. 
     In general, a significant number of sessions exist at the same time in the RBS system, since many different users can work simultaneously with the RBS system. A common practice in banks is to record (save) all sessions and store this information for a certain time (from several months to several years, as an example). Thus, in some non-limiting embodiments of the present technology, the processor  201  can be configured to obtain this array of information including a predetermined number of working sessions associated with the user from the bank, and use this array of information for training the at least one classifier as described above. 
     As it may become apparent, in an array that covers a relatively long time period (for example, a month), along with sessions of legitimate users, there will also be sessions of violators. However, it is known that the frequency of access of violators to the RBS system is extremely negligible. Thus, the majority of sessions stored over long periods of time may be considered as sessions of legitimate users. Since the training of the at least one classifier is essentially an accumulation and statistical analysis of information, the presence of a small number of illegitimate sessions will not affect the quality and results of training. 
     Thus, according to certain non-limiting embodiments of the present technology, the processor  201  may be configured to generate the training set of data associated with the user identifier of the user USER(i). More specifically, each pair of USER(i); PAGE(j) identifiers, as expressed by Equation (1), is further associated with a respective timestamp t(j). Therefore, for a given pair USER(i); PAGE(j), except for the very first pair in each session, the processor  201  can be configured to receive (or otherwise, determine) a respective time interval T between a moment of receipt of the given pair and a moment of receipt of a previous pair, preceding the given. The processor  201  can be configured to determine the respective time interval T as a difference of timestamps (t) calculated with a given accuracy, for example, with an accuracy of 0.01 seconds. For example, a time interval between a first pair and a second pair of identifiers in each working session of the user can be determined as T=t 2 −t 1 , etc. 
     Thus, according to certain non-limiting embodiments of the present technology, the processor  201  may be configured to store the given pair of identifier associated with the respective time interval. 
     The sequence of data (1), recorded for the user including the so determined time intervals may be expressed by the following equation: 
       PAGE( j )— T ( j )—PAGE( j+ 1)— T ( j+ 1)—PAGE( j+ 2)— T ( j+ 2)— . . . — Tn− 1—PAGE( j+N ),  (2)
 
     where T(j)—is the respective time interval in seconds and fractions of a second (not necessarily integer) that elapsed between the moment when the user opened the PAGE(j) user interface window and the moment when the same user opened the PAGE(j+1) user interface window. 
     It should be noted that there can be no relation between the PAGE(j) and PAGE(j+1) user interface windows themselves (for example, web pages) in the RBS. For example, there can be no logical relation therebetween, such as a request expressed in a text message from the PAGE(j) user interface windows to go to the PAGE (j+1) user interface windows; nor there can be a physical relation therebetween, such as hyperlinks leading from the one page to the other. Such transitions are formed in the sessions of bots, i.e. programs that simulate a particular activity of the RBS. 
     Thus, in some non-limiting embodiments of the present technology, for the user identifier USER(i), the processor  201  may be configured to receive data of user interface windows opened by the user in a plurality of working sessions of the user in the RBS, as illustratively expressed by Equations (3) below. 
         S 1=PAGE(5)-8-PAGE(9)-51- . . . -PAGE(2)-6-PAGE(6)-4-PAGE(33)-12-PAGE(21) 
         S 2=PAGE(8)-88-PAGE(35)- . . . -PAGE(6)-5-PAGE(33)-10-PAGE(21)-31-PAGE(2) 
         S 3=PAGE(6)-4-PAGE(33)-18-PAGE(21)- . . . -PAGE(54)-93-PAGE(5)-11-PAGE(9) . . . 
         Sk =PAGE(94)-11-PAGE(62)-52- . . . -PAGE(5)-42-PAGE(9)-30-PAGE(72)  (3)
 
     When a number of working sessions Sk in the plurality of working sessions exceeds a predetermined threshold (for example, 20), the processor  201  may be configured to analyze the plurality of working sessions to identify at least one pattern therein, as described above in respect of step  108  of the method  100 . For example, the processor  201  may be configured to identify a repeating sequence of pages, similar to the PAGE(6)-PAGE(33)-PAGE(21) sequence underlined in Equation (3) as being a pattern. Time intervals T(j) at the pattern identification step are not taken into account. 
     It should be noted that the present example in respect of the generating the training set of data is described in respect of a single user (that is, the user), as according to certain non-limiting embodiments of the present technology, working sessions of different users are never analyzed together. 
     Further, according to certain non-limiting embodiments of the present technology, a length of the at least one pattern, i.e. a number of user interface windows therein, can be predetermined. In some non-limiting embodiments of the present technology, the length of the at least one pattern can be specified by an interval. For example, if the length from 3 to 6 is predetermined, then the processor  201  may be configured to identify a sequence of PAGE(6)-PAGE(33)-PAGE(21), having a length of 3, as a pattern; and further may be configured to discard a sequence of PAGE(5)-PAGE(9) (bolded in Equation (3)), having a length of 2. In other non-limiting embodiments of the present technology, the length of the at least one pattern can be predetermined to be a fixed value, for example, 4. 
     In yet other non-limiting embodiments of the present technology, the processor  201  can be configured to determine the length of the at least one pattern automatically, based on a number of occurrences thereof identified in the plurality of working sessions associated with the user. In these embodiments, the processor  201  is configured to start searching for occurrences of the at least one pattern, for example, at a given length of 3. Further, if and when the number of occurrences of the at least one pattern identified in the plurality of working sessions exceeds a predetermined threshold (for example, 10), the processor  201  can be configured to increase the length of the at least one pattern by one and the search is repeated, discarding the previously found shorter patterns. Thus, the processor  201  can be configured to execute such a cycle until the number of occurrences of the at least one pattern smaller than the predetermined threshold and having a maximum possible length is found. 
     Further, in some non-limiting embodiments of the present technology, the processor  201  may be configured to assign to each user interface window of the at least one pattern an a priori weight value. 
     In the context of the present specification, a “weight value” denotes a predetermined number associated with a given pattern and stored in computer system that implements the method  100 , such as the RBS in the present example. 
     For example, assume the at least one pattern includes a PAGE(m) user interface window, which serves in the interface of the RBS for requesting transfers of funds of the user to a bank account or to a wallet of a cashless payment system; thus, the processor  201  can be configured to assign to the PAGE (m) an increased weight value, for example, 3 times greater than respective weight values of other patterns. 
     In some non-limiting embodiments of the present technology, the processor  201  can be configured to assign this weight value to any patterns including the PAGE(m) user interface window, no matter in which particular USER(i) user&#39;s sessions these patterns have been found. 
     In another example, the processor  201  can be configured to assign to patterns including a PAGE(x) user interface window, which serves to pay utility bills or taxes in the interface of the RBS, a reduced weight value, for example, 0.3 of the respective weight value of unmodified patterns. 
     According to certain non-limiting embodiments of the present technology, the processor  201  can be configured to use these weight values both at the step of training the at least classifier described above with respect to step  112  of the method  100 , and at the step of controlling the user&#39;s identity. Such weight values make sense when the RBS is sensitive to an event of a certain type. In this example, an atypical behavior of any user in a high-risk scenario, comprising the PAGE(m) window, will “alarm” the RBS much more than an atypical behavior in a tax payment scenario, where the probability of appearance of a violator taking over other people&#39;s credentials approaches zero. 
     Further, as described above with respect to step  110  of the method  100 , the processor  201  may be configured to generate, for the at least one pattern identified in the plurality of working sessions, a set of parameters characterizing the behavior of the user working with the RBS. According to certain non-limiting embodiments of the present technology, the processor  201  is configured to generate the set of parameters based on data received via the plurality of working sessions associated with the user. 
     In some non-limiting embodiments of the present technology, a first parameter may be a time vector V. Broadly speaking, the time vector V is a vector whose dimension corresponds to the number of time intervals within the at least one pattern. For example, for the PAGE(6)-PAGE(33)-PAGE(21) pattern, the time vector will be two-dimensional: V=(Tavg1, Tavg2), where Tavg1 is a time characteristic for the associated user, calculated by a pre-determined algorithm, between the opening of PAGE(6) and PAGE(33) user interface windows, and Tavg2 is a time characteristic indicative of a time interval between the opening of PAGE(33) and PAGE(21) user interface windows. 
     In some non-limiting embodiments of the present technology, the processor  201  can be configured to determine Tavg1 and Tavg2 by averaging respective time intervals T(j) between PAGE(6) and PAGE(33) pages, as well as between pages PAGE(33) and PAGE(21) over all occurrences of associated patterns found in the plurality of working sessions associated with the user. 
     The averaging of the respective time intervals, for example, Tavg1, can include an arithmetic average of all times T 1  for all occurrences of an associated pattern found in the plurality of working sessions associated with the user. 
     In other non-limiting embodiments of the present technology, the processor  201  can be configured to determine a geometric average over all the occurrences of the associated pattern. In yet other non-limiting embodiments of the present technology, the processor  201  can be configured to determine one of the Tavg1 and the Tavg2 as a weighted average, wherein the processor  201  uses a number of user interface windows separating a given interval from a respective one of the initial time interval T 1  and the initial time interval T 2  or from the respective final time intervals of the respective pattern as a weight value for each time interval Ti. Thus, in these embodiments, time intervals at the beginning or at the end of a given working session of the user have greater effect on the one of the Tavg1 and the Tavg2 
     Further, in other non-limiting embodiments of the present technology, the time vector V may have a dimension of 2*n, where n is the number of time intervals within the at least one pattern. In this case, the time vector V stores both the calculated values of the time interval Tavg and associated variance values D. The variance here is an indicator of how Tavg varies for the user of the plurality of working sessions. Such vector of 2*n dimension might look as follows: V=(Tavg1, D1, Tavg2, D2). 
     In some non-limiting embodiments of the present technology, the processor  201  can be configured to determine the variance value D1 on the basis of the plurality of working sessions of the user as a variance of the random variable Tavg1, as an example. Similarly, the processor  201  can be configured to determine the variance value D2 as a variance of the random variable Tavg2. 
     In additional non-limiting embodiments of the present technology, the processor  201  can further be configured to determine a frequency of occurrence of the at least one pattern indicating how often the at least pattern occurs in the plurality of working sessions of the user. According to non-limiting embodiments of the present technology, the processor  201  can be configured to determine the frequency of occurrence as a ratio of the number of occurrences of the at least one pattern L to the number of sessions in the plurality of sessions. Thus, a value of the frequency of occurrence can be less than 1 if the at least one pattern is not found in each and every working session of the plurality of working, or more than 1, if the at least one pattern occurs several times during in each one of the plurality of working sessions, as expressed by Equation (4) below. 
       λ= L/K   (4)
 
     In some non-limiting embodiments of the present technology, the processor  201  can be configured to store the set of parameters associated with the at least one patterns for inclusion thereof in the training set of data, as described above with regard to step  110  of the method  100 . Further, the processor  201  can be configured to identify more patterns within user interface windows of the plurality of working sessions for generating the training set of data, such as hundreds, thousands, or even hundreds of thousands of patterns. Also, to tackle a problem of sparsity of data, the processor  201  can be configured to increase the predetermined number of working sessions of the plurality of working sessions, associated with the user, used for the generating the training set of data. 
     Further, as described above with respect to step  112  of the method  100 , the processor  201  can be configured to train, based on the so-generated training set of data, the at least one classifier. In this regard, the at least one classifier to identify the user in in-use (that is, future) working sessions thereof in the RBS. According to non-limiting embodiments of the present technology, the at least one classifier may comprise, for example, and not as a limitation, at least one of a probabilistic graphical model (Random Forest) and an SVM classifier. 
     Accordingly, patterns of the training set of data that have been assigned greater respective weight values may have a proportionately greater effect on a final decision of the trained at least one classifier, and vice versa. In a similar way, respective values of the frequency of occurrence associated with the patterns can also be used at this step as an increasing or decreasing factor. 
     In some non-limiting embodiments of the present technology, the at least one classifier may comprise (1) a first classifier trained based on a training set of data including averaged time intervals, and (2) a second classifier trained based on a training set of data including variance values of the averaged time intervals. 
     It should be noted that steps  106  to  112  of the method  100  and associated example implementations thereof may be executed, by the processor  201 , online directly, for example, during the operation of the RBS. 
     In other non-limiting embodiments of the present technology, the processor  201  can be configured to execute the steps of the training the at least one classifier offline. In these embodiments, the processor  201  can be configured to receive an array of data previously saved by the RBS for analysis, performs data analysis as described above, trains the at least one classifier for all users whose identifiers were in the received data array. When the analysis is completed and the at least one classifier is trained, the processor  201  can be configured to continue the operation in an online mode and then functions together with the RBS. 
     Further, in some non-limiting embodiments of the present technology, the processor  201  can be configured to apply the so trained at least one classifier to the in-use sequence of user interface windows opened during the in-use working session to identify the user in the computer system. To that end, the processor  201  can be configured to receive, in the in-use working session, the user identifier USER(i) of the user, and further apply the trained at least one classifier to this USER (i). All data from the in-use working session is fed to the input of the at least one classifier. Thus, the processor  201  can be configured to identify the user directly during the work of the user with the RBS. 
     According to some non-limiting embodiments of the present technology, the at least one classifier may be configured to make a decision in a form of a numerical estimate of the probability that a user of the in-use session of the RBS system under the USER(i) is the same user, the training set of data associated with whom was used for training the at least one classifier. This decision is constantly updated during the in-use working session, i.e. the decision of the at least one classifier is revised upon receipt of each regular {USER(i), PAGE(j)} pair. 
     The decisions of each classifier come to the antifraud system of the bank, where they can be used to generate alarm messages that have meaning of a warning about the atypical behavior of a particular USER(i) user, or other signals of a similar purpose. 
     In those embodiments of the present technology, where the computer system does not include an antifraud feature (for example, an online store, a web service for collaboration, a multiplayer computer game), the decisions of the trained at least one classifier can be supplied into the access control system used by the computer system, to the computer workstation panel of the service moderator or information security specialist, or used by the system software to take actions preventing illegal access to the computer system. For example, to initiate a direct connection with the user and request further identifying information (control question, phone number, and so on). 
     In some non-limiting embodiments of the present technology, such a signal can be generated if there are no typical patterns over a predetermined threshold number of user interface windows opened in the in-use working session, i.e. when there is detected an atypical behavior in the computer system for a predetermined time interval. 
     In other non-limiting embodiments of the present technology, the computer system may be configured to generate an alarm message in response to one or more most frequently occurred patterns associated with the user being absent for the predetermined time interval. 
     As noted above, according to certain non-limiting embodiments of the present technology, the computer system associated with implementing the method  100  can include an authorized remote access service including multiple user interface windows or multiple working zones in one complex user interface window and various possible methods to switch between them (both windows and zones). 
     Computing Device 
     With reference to  FIG. 2 , there is depicted an example functional diagram of the computing device  200  configurable to implement certain non-limiting embodiments of the present technology including the method  100  described above. 
     In some non-limiting embodiments of the present technology, the computing device  200  may include: the processor  201  comprising one or more central processing units (CPUs), at least one non-transitory computer-readable memory  202  (RAM), a storage  203 , input/output interfaces  204 , input/output means  205 , data communication means  206 . 
     According to some non-limiting embodiments of the present technology, the processor  201  may be configured to execute specific program instructions the computations as required for the computing device  200  to function properly or to ensure the functioning of one or more of its components. The processor  201  may further be configured to execute specific machine-readable instructions stored in the at least one non-transitory computer-readable memory  202 , for example, those causing the computing device  200  to execute the method  100 . 
     In some non-limiting embodiments of the present technology, the machine-readable instructions representative of software components of disclosed systems may be implemented using any programming language or scripts, such as C, C++, C#, Java, JavaScript, VBScript, Macromedia Cold Fusion, COBOL, Microsoft Active Server Pages, Assembly, Perl, PHP, AWK, Python, Visual Basic, SQL Stored Procedures, PL/SQL, any UNIX shell scrips or XML. Various algorithms are implemented with any combination of the data structures, objects, processes, procedures and other software elements. 
     The at least one non-transitory computer-readable memory  202  may be implemented as RAM and contains the necessary program logic to provide the requisite functionality. 
     The storage  203  may be implemented as at least one of an HDD drive, an SSD drive, a RAID array, a network storage, a flash memory, an optical drive (such as CD, DVD, MD, Blu-ray), etc. The storage  203  may be configured for long-term storage of various data, e.g., the aforementioned documents with user data sets, databases with the time intervals measured for each user, user IDs, etc. 
     The input/output interfaces  204  may comprise various interfaces, such as at least one of USB, RS232, RJ45, LPT, COM, HDMI, PS/2, Lightning, FireWire, etc. 
     The input/output means  205  may include at least one of a keyboard, joystick, (touchscreen) display, projector, touchpad, mouse, trackball, stylus, speakers, microphone, and the like. A communication link between each one of the input/output means  205  can be wired (for example, connecting the keyboard via a PS/2 or USB port on the chassis of the desktop PC) or wireless (for example, via a wireless link, e.g., radio link, to the base station which is directly connected to the PC, e.g., to a USB port). 
     The data communication means  206  may be selected based on a particular implementation of the network, and may comprise at least one of: an Ethernet card, a WLAN/Wi-Fi adapter, a Bluetooth adapter, a BLE adapter, an NFC adapter, an IrDa, a RFID adapter, a GSM modem, and the like. As such, the connectivity hardware  504  may be configured for wired and wireless data transmission, via one of WAN, PAN, LAN, Intranet, Internet, WLAN, WMAN, or GSM networks. 
     These and other components of the computing device  200  may be linked together using a common data bus  210 . 
     It should be expressly understood that not all technical effects mentioned herein need to be enjoyed in each and every embodiment of the present technology. 
     Modifications and improvements to the above-described implementations of the present technology may become apparent to those skilled in the art. The foregoing description is intended to be exemplary rather than limiting. The scope of the present technology is therefore intended to be limited solely by the scope of the appended claims.