# Wireless Communication: Applications Security and Reliability--Present and Future
## 2 The Present Issue  
This Special Issue consists of seventeen papers covering a broad range of topics related to the applications of wireless communication, cryptography, cybersecurity, and electromagnetic immunity, from cognitive radio and channel acquisition to pseudo-random generators, attack detection, and electromagnetic eavesdropping. Wideband communication in different frequency bands, efficient use of spectrum, channel sensing and acquisition, protection of information in the aspect of electromagneticemissions, and the selection of test methods for new IT devices from the point of view of immunity from electromagnetic fields were particularly interesting for the authors. The authors of the articles paid attention to many aspects of wireless communication, existing threats, and solutions whose application increases the level of information security. The issues discussed in detail showed how important elements are communication reliability [7; 8; 9], information security [10; 11], and resistance to various types of external attacks--cyberattacks [12; 13], cryptographic attacks [14; 15], or electromagnetic attacks [16; 17; 18; 19]. In [20], an interesting research problem in edge computing is explored. In particular, the dynamics of delay and reliability caused by VNF parallelization and BVNF deployment are modeled and formulated. The authors also designed an approximation algorithm to solve the formulated problem. In [21], a novel topology construction method for a UAV swarm network that takes into account the criterion of topology duration in addition to other important criteria such as network throughput, end-to-end delay, and node energy consumption is proposed. The paper aims to formulate the topology construction of a swarm network as an optimization problem and solve it using a double-head clustering method that considers group similarity of movement, intra- and inter-cluster distance, node forwarding delay, and energy strategy. The proposed method is designed to be effective in constructing network topologies for large-scale UAV swarm scenarios. In [22], the scalability and performance of SDN-based large-scale Wi-Fi networks are examined. To assess Wi-Fi networks on SDN, the TCP and UDP protocols were used. Using a testbed comprised of Mininet-Wi-Fi and a Ryu Controller, Wi-Fi over SDN and its functionality and scalability were investigated. [23] introduces a mathematical model for P2P networks to study the effect of two different attacks on these systems. In [24], an algorithm that improves compression efficiency by combining CAS map and MAC to remove header bits of CAS map-based compression algorithms is proposed. Using the proposed method shows that the occurrence of compressed messages exceeding 4 bytes is reduced by up to 75.9% compared to the Triple ID method. In [25], a method to compare the OWL-based and XML-based approaches to represent and query cognitive radio capabilities using quantitative metrics is proposed. In order to prove the feasibility and correctness of the method, a proof-of-concept system for the method is developed. Two types of metrics, matching quality metrics and performance metrics, were collected by the system with progressively less complete background knowledge representations and different-sized sets of devices and queries. In [26], the feasibility of Li-Fi communication by considering Red Sea parameters was explored, including a high salinity and growing turbidity. These parameters have a huge impact on blocking the entire Li-Fi communication with little increase. The experimental results show that the Li-Fi signals are affected less by salinity and more by turbidity but are found to be sufficiently strong to be used for communication in the Red Sea. In wireless communications [27], high-security defense systems such as Low Probability of Detection (LPD), Low Probability of Interception (LPI), or Low Probability of Exploitation (LPE) communication algorithms are examined.