METHOD FOR CIPHERING BINARY INFORMATION AND DEVICE WHICH IMPLEMENTS SAID METHOD Russian patent published in 1997 - IPC

FIELD: cryptography, in particular, communication, computer engineering, information systems. SUBSTANCE: method involves multiple addition of a key to information to be converted and subsequent application of substitution and permutation operations. Receiving and transmitting parts of device have n-bit key register 1, n-bit shift register 2, n-bit adder 3, unit 4 which performs bit conversion by function f, majority gate 5, uniform adder 6. EFFECT: possibility of bit-by-bit ciphering using key of arbitrary length. 4 cl, 2 dwg