The systems of intrusion detection and prevention are considered, the operation of which is based on the study of network traffic anomalies (Anomaly-Based Intrusion Detection and Prevention Systems). Statistical analysis of time series describing the network traffic of various services and information services of modern telecommunication systems and networks is carried out. The homogeneity of network traffic according to various criteria is investigated, it is shown that the use of statistical analysis makes it possible to monitor the network activity successfully for intrusion detection and prevention of their impact on the protected information resources.

Code-Based Public-Key Cryptosystems were been considered in this work. In addition, the current state, the existing contradictions and prospects of practical use for the post-quantum period were been studied. The authors have proposed new scheme of crypto-transformation that significantly exceeds the relative speed of information transmission. An advantage of the proposed scheme compared with the well known the McEliece and Niederreiter schemes has shown.

Synchronous stream ciphers produce long keystreams to be XORed with plaintext. The output keystreams should be indistinguishable from truly random sequences and should not leak any information about the secret key and the internal state of the cipher. In this study, we analyze of modern stream ciphers according to various criteria using methodology eSTREAM.

With cryptographic investigations, the design of Boolean functions is a wide area. The Boolean functions play important role in the construction of a symmetric cryptosystem. In this paper the modified hill climbing method is considered. Using hill climbing techniques, the method allows modifying bent functions used to design balanced, highly non-linear Boolean functions with high algebraic degree and low autocorrelation. The experimental results of constructing the cryptographically strong Boolean functions are presented.