GOST (block cipher)

The GOST block cipher, also called Magma, is defined in the standard GOST 28147-89 and is a Soviet and Russian government standard symmetric-key block cipher with a block size of 64 bits. The original standard, published in 1989, did not give the cipher any name, but the most recent revision of the standard, GOST R 34.12-2015, specifies that it may be referred to as Magma. The GOST hash function is based on this cipher. The new standard also specifies a separate 128-bit block cipher called Kuznyechik, so the older 64-bit design and its successor are treated as two distinct algorithms within the same national standard.