FOX (cipher)
Encyclopedia : F : FO : FOX : FOX (cipher)
| IDEA NXT (FOX) | |||
| |||
| General | |||
| Designer(s) | Pascal Junod, Serge Vaudenay | ||
| First published | 2003 | ||
| Derived from | IDEA | ||
| Cipher(s) based on this design | None | ||
| Algorithm detail | |||
| Block size (cryptography)>Block size(s) | 64, 128 bits | ||
| Key size(s) | 0-256 bits | ||
| Structure | Lai-Massey scheme | ||
| Number of rounds | 12 | ||
| Best cryptanalysis | |||
| Integral attack on 7 round FOX-64 with time complexity of 2237.4 and on 5 round FOX-128 with time complexity of 2205.6 by Wu Wenling, Zhang Wentao, and Feng Dengguo. | |||
In cryptography, the FOX (now called IDEA NXT) algorithm is a block cipher designed by Pascal Junod and Serge Vaudenay of EPFL (Lausanne, Switzerland). It was conceived between 2001 and 2003, the project was originally named FOX and was published in 2003. In May 2005 it was announced by MediaCrypt under the name IDEA NXT. IDEA NXT is the successor of the IDEA algorithm and it uses an extended Lai-Massey scheme known for its robustness to cryptanalysis. It was mandated by MediaCrypt, a Swiss company owner of the distribution rights on IDEA and the patents of IDEA NXT. The IDEA NXT cipher is a family of different sub-ciphers with various blocks and keys size : Standard NXT64 (block of 64 bits, key of 128 bits, 12 rounds) and Standard NXT128 (block of 128 bits, key of 256 bits, 12 rounds). Variations of the Standard versions can be built (key of 0-256 bits, round numbers from 2-255). Also individual tables (sbox, permutation matrix) can be loaded, replacing the Standard table.
This cipher and its key management are patented. It is now sold by MediaCrypt under the name of IDEA NXT.
External links
- [Mediacrypt homepage] — IDEA licensor
- [link] Technical description of IDEA NXT.
- [FOX: a new family of block ciphers]
- [FOX algorithm implementation - a hardware design approach]
- [Wu Wenling, Zhang Wentao, and Feng Dengguo - Improved Integral Cryptanalysis of FOX Block Cipher]
- [BSD licensed C Software implementation of IDEA NXT]
| Block ciphers [edit] |
| Algorithms: 3-Way | AES | Akelarre | Anubis | Blowfish | C2 | Camellia | CAST-128 | CAST-256 | CMEA | CS-Cipher | DEAL | DES | DES-X | FEAL | FOX | FROG | G-DES | GOST | Hasty Pudding Cipher | ICE | IDEA | Iraqi | KASUMI | KHAZAD | Khufu and Khafre | Libelle | LOKI89/91 | LOKI97 | Lucifer | MacGuffin | Madryga | MAGENTA | MARS | MISTY1 | MMB | NewDES | Noekeon | RC2 | RC5 | RC6 | REDOC | Red Pike | S-1 | SAFER | SEED | Serpent | SHACAL | SHARK | Skipjack | SMS4 | Square | TEA | Triple DES | Twofish | XTEA |
| Design: Feistel network | Key schedule | Product cipher | S-box | SPN Attacks: Brute force | Linear / Differential cryptanalysis | Mod n | Related key | XSL Standardization: AES process | CRYPTREC | NESSIE Misc: Avalanche effect | Block size | IV | Key size | Modes of operation | Piling-up lemma | Weak key |
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