On the application of pseudo-accidental sequences in the information protection systems

In the world today the creation of secure informational technologies, which can effectively resist criminal informational attacks is a major component of the state economic and defense potential. In the field of information protection widely used are the so-called pseudo-accidental sequences (PAS) formed on the basis of linear recurrent register shifts (LRRS). Considered in the paper are the properties of PAS, which are identical to the properties of purely accidental sequences. Formulated are the necessary and sufficient conditions of securing the required level of PAS stability as to the detection of its structure in regards to the arbitrarily intercepted length of the outgoing sequence of LRRS. Also indicated are the organizational and technical means of detection and annulment of such situations, which lead to the lowering of the PAS stability level in regards to the detection of its structure.