Розробка стійких до лінійного та диференціального криптоаналізу засобів шифрування даних в комп’ютерних системах

Abstract

In this master’s qualification work the problem of encryption with increased resistance to linear and differential cryptanalysis was reviewed. The problems and features of modern ciphers are examined and the way to solve the issue is suggested in the form of encryption method based on the use of three-level nested substitution-permutation networks and highly nonlinear substitution blocks. The application for information encryption is created on the basis of the developed algorithm. The efficiency of the algorithm is analised by calculating its linear and differential characteristics.