КОНЦЕПТУАЛЬНІ ЗАСАДИ МЕТОДУ ЗМІШУВАННЯ БІТ ДЛЯ ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ ШИФРУВАННЯ РЕ-ФАЙЛІВ НА БАЗІ БЛОКОВИХ АЛГОРИТМІВ

Block encryption algorithms provide high encryption speed and are relatively simple to implement. However, under certain conditions, a decrease in stability may be observed. For example, for DES in ECB mode, in the case of encryption of EXE files and files of other types, the first block of which is the header of this file, since knowing its content, it is possible to significantly reduce the time of breaking the cipher itself. To avoid such situations, it is suggested to perform a bit-mixing operation on the original message to be encrypted. Such an operation destroys semantic features in the file being encrypted, thereby creating conditions for increasing the cryptographic stability of the cipher.