Feistel cipher [SEP] named after
Feistel cipher
In cryptography, a Feistel cipher is a symmetric structure used in the construction of block ciphers, named after the German-born physicist and cryptographer Horst Feistel who did pioneering research while working for IBM (USA); it is also commonly known as a Feistel network. A large proportion of block ciphers use the scheme, including the Data Encryption Standard (DES). The Feistel structure has the advantage that encryption and decryption operations are very similar, even identical in some cases, requiring only a reversal of the
Kuznyechik they follow the trend of difficult to pronounce algorithm names set up by Rijndael and Keccak. There is also a rumor that the cipher was named after its creators: A.S.Kuzmin, A.A.Nechaev and Company (Russian: Кузьмин, Нечаев и Компания).
The standard GOST R 34.12-2015 defines the new cipher in addition to the old GOST block cipher (now called Magma) one and does not declare the old cipher obsolete.
Kuznyechik is based on a substitution-permutation network, though the key schedule employs a Feistel