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:

Large fixed block size

Ciphers with large fixed block size are:

  • the 512-bit AES-like block cipher used in the Whirlpool hash algorithm, called the Whirlpool or W cipher
  • the Threefish cipher, with 256, 512 and 1024-bit versions, used in the Skein hash algorithm