LOKI
In cryptography, LOKI89 and LOKI91 are block ciphers designed as possible replacements for the Data Encryption Standard (DES). The ciphers were developed based on a body of work analysing DES, and are very similar to DES in structure. The LOKI algorithms were named for Loki, the god of mischief in Norse mythology.
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LOKI89
LOKI89 was first published in 1990, then named just "LOKI", by Austrialian cryptographers Lawrie Brown, Josef Pieprzyk and Jennifer Seberry. LOKI89 was submitted to the European RIPE project for evaluation, but was not selected.
The cipher uses a 64-bit block and a 64-bit key. Like DES, it is a 16-round Feistel cipher and has a similar general structure, but differs in the choice of the particular S-boxes, the "P-permutation", and the "Expansion permutation".
LOKI91
LOKI 91 was designed in response to the attacks on LOKI89 (Brown et. al., 1991). The changes included removing the initial and final key whitening, a new S-box, and small alterations to the key schedule.
See also
References
External links
Block ciphers
Algorithms: 3-Way | AES | Blowfish | Camellia | CAST-128 | CAST-256 | CMEA | DEAL | DES | DES-X | FEAL | G-DES | GOST | IDEA | Iraqi | KASUMI | KHAZAD | Khufu and Khafre; | LOKI89/91 | LOKI97 | Lucifer | MacGuffin | Madryga | MAGENTA | MARS | MISTY1 | MMB | NewDES | RC2 | RC5 | RC6 | Red Pike; | S-1 | SAFER | Serpent | SHARK | Skipjack | Square | TEA | Triple DES; | Twofish | XTEA
Design: Feistel network; | Key schedule; | Product cipher; | S-box | SPN Attacks: Brute force; | Linear / Differential cryptanalysis | Mod n; | XSL Standardisation: AES process; | CRYPTREC | NESSIE Misc: Avalanche effect | Block size; | IV | Key size; | Modes of operation; | Piling-up lemma; | Weak key;