Skladannyi P. Models and Methods of Ensuring Imitation Resistance and Confidentiality in Information Processing Systems

The dissertation is devoted to the decision of the actual scientific problem in development of theoretical and applied bases of construction and maintenance by methods of cryptographic processing of the information of imitation stability and confidentiality of the data in SOI taking into account set of cyberthreats and potential consequences of their realization. The paper proposes models and methods that form the basis for a new model of operation (cryptoscheme) of a multi-alphabetic substitution encoder (module of cryptographic protection of information) in data processing systems. In the time scale close to the real one, simulation experiments were carried out to study this cryptoschema. The obtained results showed its effectiveness in ensuring the imitation stability and confidentiality of information circulating in the SOI, as well as in providing under the influence of cyberattacks the actual functional security and survivability of the system itself. The use of a new model of multi-alphabetic replacement encoder allowed: determine the boundaries for the relative effectiveness of the information security system in SOI in cyber attacks; reduce the likelihood of forgery of the management team to an acceptable value for practical use, estimated at 10-6; reduce attack detection time by approximately 20%; reduce the cost of the system for detecting attacks on software implementations of CCI by about 25%; to ensure the possibility of automatic transition of the UAV to the mode of autonomous execution of tasks in case of detection of threats to the security of the protection system of its radio control channel and data transmission.