Comparison of Stream Modes in Block Symmetric Ciphers

In this chapter are being carried out the statistical researches of the pseudorandom bits sequences, which have been formed by the national BSC of Ukraine «Kalyna» with using of electronic codebooks modes (ECB) or of simple substitution (base conversion) and of stream modes: CTR, CFB, CBC, OFB. For comparison of statistical security indices the researches of properties of the pseudorandom sequences are being performed, which are being formed by the block symmetric ciphers AES (FIPS-197) and the GOST 28147:2009.