METHOD FOR CODING OF M MESSAGE REPRESENTED AS MULTIDIGIT BINARY NUMBER Russian patent published in 2012 - IPC G09C1/00 H04L9/00 

FIELD: electricity.

SUBSTANCE: method of unit coding of a message M represented in a binary form includes the following sequence of actions: generation of a secret key in the form of a set of subkeys K₁, K₂, …, K_h, where h≥1, generation of auxiliary multidigit binary numbers (MBN) p, Q₁ ⁽¹⁾,Q₂ ⁽¹⁾,…,Q_d ⁽¹⁾, Q₁ ⁽²⁾, Q₂ ⁽²⁾, …, Q_d ⁽²⁾,…, Q₁ ^(k), Q₂ ^(u),…, Q_d ^(u), R₁, R₂, …, R_u, where 1<d and 1<u<d, generation of a cryptogram in the form of a set of MBN, C₁, C₂, …, C_d, which complies with a system of equations Q₁ ⁽¹⁾, C₁ + Q₂ ⁽¹⁾C₂ +… + Q_d ⁽¹⁾C_d = R₁ mod p, Q₁ ⁽²⁾C₁+Q₂ ⁽²⁾C₂+…+ Q_d ⁽²⁾Cd =R₂ mod p, …,Q₁ ^(u)C₁+Q₂ ^(u)C₂+…+Q_d ^(u)C_d =R_u mod p, where at least one of multidigit binary numbers R₁, R₂,…, R_u depends on an M message, and at least one of multidigit binary numbers Q₂ ⁽¹⁾,…,Q_d ⁽¹⁾, Q₁ ⁽²⁾, Q₂ ⁽¹⁾,…,Q_d ⁽²⁾,…,Q_d ⁽²⁾,…,Q₁ ^(u), Q₂ ^(u),…,Q_d ^(u) depends on one of subkeys K₁ K₂, …, K_h.

EFFECT: increased resistance of a cryptogram.

3 cl, 1 ex