METHOD FOR STREAM ENCRYPTION OF DATA

FIELD: electric communications and computer engineering. ^ SUBSTANCE: the essence of stream data encryption method includes generation of encryption key in form of binary vector n bit long, generation of two or more pseudo-random series of symbols in form of binary vectors k bit long, division of data flow on block-symbols in form of binary vectors k bit long, transformation of block-symbols to encrypted message by using pseudo-random series of symbols and nonlinear cryptographic transformations and transmission over communication line, while one of pseudo-random series of symbols is made in form of binary vectors k bit longs by taking information from various bits of shift register, and another pseudo-random series is made in form of binary vectors k bit long by using "1" symbol in zero bit of binary vector, and for other bits - symbols, taken from k-1 various bits of register and are used for their transformation of operation of addition and multiplication of symbols in residue class ring by module p=2k. ^ EFFECT: increased data encryption speed and expanded range of change of encryption's resistance to attacks on basis of known and selected original texts. ^ 2 dwg