CIPHERING UNIT Russian patent published in 1999 - IPC

FIELD: electrical communications and computer engineering. SUBSTANCE: unit has at least one exchange data assembly and W г 2 n-bit series-connected adders, where n is even natural number; first input of first adder is data input of ciphering unit; output of W-th adder is ciphering unit output; novelty is that exchange data assembly is, essentially, controlled exchange data assembly whose data input functions as control input of ciphering unit; output of controlled exchange data assembly is second input of P-th adder, where 1г P г W; control input of controlled exchange data assembly is connected to first input of G-th adder, where 1 г G г W. EFFECT: improved cryptographic stability to differential cryptoanalysis. 3 cl, 7 dwg