Perfecting of the matrix Affine cryptosystem information security

The features of the development of robust cryptosystems of information security. The system combines the matrix Affine transformation, multi-round action with different keys, as well as commuting the algorithm. This can significantly increase its crude to the cryptographic attacks. The algorithm encryption/decryption of data using multi-round permutation matrix Affine cryptosystem with a variety of encryption keys for each round is mathematically description.