Алгоритмічне та програмне забезпечення криптографічної системи на основі мережі Фейстеля в легкій промисловості

Abstract

The cryptographic system is a service that enables the user to encrypt or decrypt information for further transmission on computer networks or for secure storage on a hard disk. It should be presented in the form of a window application with an intuitive interface so that the system can be used by ordinary users. For encryption and decryption, an algorithm based on the Feistel network was chosen, since it is block and using a symmetric key, that is, during operation, the data that needs to be encrypted is split into blocks of the same length and encrypted or decrypted with the same key. The structure of the encryption algorithms was named after Horst Feistel, one of the developers of the Lucifer encryption algorithm and developed on the basis of the DES (Data Encryption Standart) algorithm, the former (but still widely used) US encryption standard. Among other algorithms based on the Feistel network, one can give an example: the domestic standard of encryption GOST 28147-89 (and more modern GOST R 34.12-2015), as well as other known algorithms: RC5, BlowFish, TEA, CAST-128.