CSKH02.2019 - (Abstract) - The paper considers the possibility of using the method of testing the properties of bit sequences as one of the possible approaches to solving the problem of classifying pseudo-random sequences and the sequences formed by encryption and compression algorithms. The results of the analysis led to the conclusion that the proposed feature space could be used to identify ZIP, RAR compression algorithms, and AES, 3DES encryption algorithms with an accuracy of more than 0.95.