Description: The research results pseudorandom number generator, based on the use of congruence addition, are considered and theoretically grounded. A test of the possibility of encoding information in two random not degenerate operations of cryptographic transformation of information, followed by the addition of the results of congruence encoding 2. The study found that 33.33% resulting conversion operations of information will be not degenerate and 66.66%, will be degenerate and this in its turn does not allow using this transformation for block cryptosystems, but leads to improvement of the statistical characteristics of the resulting pseudorandom sequence which can be used in stream code. The results indicate that the congruence addition 2 of the transformation results improves the quality of pseudorandom sequence as inverse transformation mechanism is absent.
Keywords: pseudorandom sequence, operations of congruence addition 2, degeneration of operation results