METHOD FOR ARITHMETIC ENCODING WITH ENCRYPTION Russian patent published in 2016 - IPC H04L9/08 G06F21/60 

FIELD: cryptography.

SUBSTANCE: invention relates to telecommunication and information technology, specifically, to equipment for cryptographic protection of redundant binary information during data exchange over public transmission channels. Method for arithmetic encoding with encryption includes steps of: at transmitting side from sender receiving next part of binary information sequence, calculating values of first and second coding frequency counters in accordance with previously generated key and binary information sequence, setting value of first and second coding registers in accordance with values of first and second coding frequency counters, calculating arithmetic coding of next part of binary information sequence, specifying value of first and second coding registers, encrypting next part of encoded sequence taking into account previous values of first and second coding registers, at receiving side receiving next part of encrypted sequence, decoding same taking into account previous values of first and second coding registers, calculating values of first and second decoding frequency counters in accordance with key and received binary information sequence, setting values of first and second decoding registers in accordance with values of first and second decoding frequency counters, performing arithmetic decoding of next sequence which is transmitted to recipient. Invention can be used to provide confidentiality of compressed redundant binary information, transmitted in modern information-telecommunication systems.

EFFECT: efficient arithmetic coding with encryption of redundant binary information sequence with increase of degree of redundancy of encrypted information.

3 cl, 12 dwg