Feistel cipher

lastmod 2026-01-21created 2026-01-212 edits

A Feistel cipher is a type of block cipher whose encryption consists of repeating a particular computational function. The function used in each step is called the round function.

Many block ciphers have a Feistel structure. For example, DES, Blowfish, and SEED have a Feistel structure. However, there are also block ciphers without a Feistel structure, such as AES.

See also

• PostgreSQL:PrimaryKey#Using Feistel Cipher

Favorite site

• Feistel cipher - Wikipedia
• Feistel Cipher : Naver Blog
• (Information security) Feistel Cipher (Feistel structure) and DES