Savchuk M.N.

Models for non-Markov SP networks that use several different S-blocks in one encryption round are built, and algorithms for calculating upper bounds for differential probabilities are specified. The criteria for the practical selection of ARX cryptographic primitives with certain properties based on the automatic evaluation of stability are developed. The cryptanalysis of the new blockchain encryption standard of Ukraine "Kalina" and separate units of the blockchain encryption standard of the Republic of Belarus STB 34.101.31-2011 "BeLT" has been carried out.

Cryptanalytical methods of one-way mappings are modified and developed in classical and quantum computational model. New statistical criteria are proposed for evaluation of random and pseudorandom generators’ quality. Security evaluation methods against differential and linear cryptanalysis are developed for non-Markov symmetric block ciphers with their structural specific taken into consideration. Upper bounds of average probabilities of integral differentials are estimated for some classes of mappings.

The purpose of the work is to assess the effectiveness of encryption for certain types of cryptosystems, obtaining estimates of their relative resistance against attacks depending on the environment in which they operate, and to use new methods to improve cryptographic protection of information according to different models of computation and prospects of modern trends of cryptanalysis and сomputer abilities.

The purpose of the work is to improve, develop and create new effective methods and procedures of constructing and evaluating the effectiveness of cryptographic attacks with additional data on information security systems, obtaining estimates of information security systems resistance against such attacks, as well as new methods for determining directions and ways to improve hardware and software implementations of IT-security algorithms that take into account the latest attacks that use side channel information, failures data, the performing time of some operations, energy consumption and

The purpose of work consists in development and improvement probabilistic for algebra methods of research of cryptographic transformations, analysis of symmetric and asymmetric algorithms of enciphering, methods of avtentifikacii, cryptographic protocols, taking into account the last achievements of kriptologii and application of results for the estimation of firmness and efficiency of modern kriptosistem and cryptographic protocols, improvement of methods of cryptographic priv.