CRYPTOGRAPHIC BINARY DATA CONVERTER Russian patent published in 2004 - IPC

FIELD: electrical communications; cryptographic data protection devices for telecommunication networks.

SUBSTANCE: device has S ≥ 2 controlled substitution blocks 1 and S - 1 fixed permutation blocks 2. Each controlled substitution block is provided with m-bit (m ≥ 4) control input and n-bit data input, as well as (n ≥ 4) output. Controlled substitution block 1 and fixed permutation block 2 are cascaded in n-bit data inputs (outputs). Data n-bit input of first controlled substitution block and output S of controlled substitution block are data n-bit input and output of converter. Controlled substitution blocks numbered i and (S + 1 - 1) as well as fixed permutation block S are relatively convertible blocks. In addition with S being even number, fixed permutation block S/2 and with S being odd number, controlled substitution block (S + 1)/2 are internally convertible blocks. Controlled substitution blocks i and (S + 1 - 1) have equal bit capacity of control inputs.

EFFECT: provision for direct and inverse conversion of n-bit binary vector.

2 cl, 9 dwg