Block cipher/Catalogs/Cipher list

Ciphers of the Data Encryption Standard generation, all with 64-bit block size, include:

• The Data Encryption Standard itself, the first well-known Feistel cipher, using 16 rounds and eight 6 by 4 S-boxes.
• The GOST cipher, a Soviet standard similar in design to DES, a 32-round Feistel cipher using eight 4 by 4 S-boxes.
• IDEA, the International Data Encryption Algorithm, a European standard, not a Feistel cipher, with only 8 rounds and no S-boxes.
• RC2, a Feistel cipher from RSA Security which was approved for easy export from the US (provided it was used with only a 40-bit key), so widely deployed.
• RC5, a Feistel cipher from RSA security. This was fairly widely deployed, often replacing RC2 in applications.
• CAST-128, a widely used 16-round Feistel cipher, with 8 by 32 S-boxes.
• Blowfish, another widely used 16-round Feistel cipher with 8 by 32 S-boxes.
• The Tiny Encryption Algorithm, or TEA, designed to be very small and fast but still secure, a 32-round Feistel cipher without S-boxes.
• Skipjack, an algorithm designed by the NSA for use in the Clipper chip, a 32-round unbalanced Feistel cipher.
• SAFER and LOKI, two families of ciphers which each included an original version against which Lars Knudsen found an attack and a revised version to block that attack. Each had a descendant which was an AES candidate.