In the paper created a new encryption algorithms GOST28147-89-IDEA8-4 and GOST28147-89- RFWKIDEA8-4 based on networks IDEA8-4 and RFWKIDEA8-4, with the use the round function of the encryption algorithm GOST 28147-89. The block length of created block encryption algorithm is 256 bits, the number of rounds is 8, 12 and 16.