REDOC [SEP] designer
REDOC
In cryptography, REDOC II and REDOC III are block ciphers designed by Michael Wood (cryptographer) for Cryptech Inc and are optimised for use in software. Both REDOC ciphers are patented.
REDOC II (Cusick and Wood, 1990) operates on 80-bit blocks with a 160-bit key. The cipher has 10 rounds, and uses key-dependent S-boxes and "masks" used to select the tables for use in different rounds of the cipher. Cusick found an attack on one round, and Biham and Shamir
key bytes with message bytes, and uses no permutations or substitutions. Ken Shirriff describes a differential attack on REDOC-III requiring 2 chosen plaintexts and 2 memory.
References.
- Thomas W. Cusick and Michael C. Wood: The REDOC II Cryptosystem, CRYPTO 1990, pp545–563.
- Eli Biham and Adi Shamir, Differential Cryptanalysis of Snefru, Khafre, REDOC-II, LOKI and Lucifer. Advances in Cryptology—CRYPTO '91, Springer-Verlag, pp156–171 (gzipped PostScript).
- Ken Shirriff,