Information and Communication Systems Based on Signal Systems with Improved Properties Building Concept
І.Д. Горбенко, A.A. Zamula, V. L. Morozov · 2019
The paper presents the results of solving the actual problem of improving the performance indicators of information and communication systems (ICS), in particular, information security, noise immunity, secrecy, in terms of external and internal disturbing influences, based on the models and methods development for information exchange in ICS, synthesis new classes of nonlinear discrete cryptographic signals (CS) with the necessary properties.For the first time, complex non-linear discrete СS synthesis problem was formulated and solved, based on the use of random (pseudo-random) processes.Taking into account the requirements of cryptographic robustness and the complexity of generating a cryptographic signal as a source of random (pseudo-random) processes, the choice of a symmetric block encryption algorithm with a counter is grounded.The synthesis method obtained by the authors makes it possible to form large ensembles of discrete sequences of practically any period with given, but physically realizable, side-lobe values of auto, cross and butt correlation functions, as well as statistical characteristics of correlation functions that are not inferior to those of the best linear classes of signals, in terms of correlation functions.A method for synthesizing derived signal systems based on nonlinear discrete cryptographic signals is proposed.Improved (as compared with the known linear signal classes) ensemble, correlation and structural properties of the synthesized signal system allow improving the indicators of information security, noise immunity and secrecy of the operation of ICS.