FIELD: physics; computer engineering.
SUBSTANCE: invention relates to a highly reliable cryptographic processing device. In cryptographic processing, the Feistel type public key unit repeatedly executes the SPN type F function and has a nonlinear transformation unit and a linear transformation unit during several cycles. Processing of the linear transformation of the F function, which corresponds to each of the several cycles, is carried out by processing the linear transformation in which PMP quadratic matrices are used. Arbitrary m column vectors included in the inverse matrices of the PMP quadratic matrices placed in at least successive cycles with even numbers and successive cycles with odd numbers respectively make up the PMP quadratic matrix.
EFFECT: increased resistance to linear cryptoanalysis attacks in a cipher with a public key unit.
12 cl, 18 dwg
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