Block cipher/Catalogs/Cipher list
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64-bit blocks
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.
96-bit blocks
The 3-Way cipher used 96-bit blocks.
128-bit blocks
Ciphers of the Advanced Encryption Standard generation, all with 128-bit block size, include:
- AES itself, formerly known as Rijndael, an SP network, from two Belgian designers
- Twofish, a cipher with key-dependent S-boxes, from a team at Bruce Schneier's company Counterpane
- MARS, a variant of Feistel cipher using data-dependent rotations, from IBM
- Serpent, an SP network, from an international group of well-known players
- RC6, a cipher using data-dependent rotations, from a team led by Ron Rivest
- CAST-256, based on CAST-128 and with the same theoretical advantages
- DFC, based on another theoretical analysis proving resistance to various attacks.
- DEAL, a Feistel cipher using DES as the round function
- E2, from Japan
- CRYPTON, a Korean cipher with some design similarities to AES
- MAGENTA, Deutsche Telekom's candidate, quickly broken
- LOKI97, one of the LOKI family of ciphers, from Australia
- SAFER+, one of the SAFER family of ciphers, from Cylink Corporation
- Camellia, an 18-round Feistel cipher widely used in Japan and one of the standard ciphers for the NESSIE (New European Schemes for Signatures, Integrity and Encryption) project.
- SEED, developed by the Korean Information Security Agency (KISA) and widely used in Korea.
Variable block size
Ciphers with variable block size, whose 128-bit variants were AES candidates, are:
- Hasty Pudding, a variable block size tweakable cipher
- FROG, an innovative cipher; interesting but weak
Large fixed block size
Ciphers with large fixed block size are: