Ver:
· Criptografía de clave secreta
· https://www.cosic.esat.kuleuven.be/nessie/
· http://en.wikipedia.org/wiki/SHACAL
Algoritmo de
cifra basado en un secreto compartido (clave). Cifra el texto en bloques de
128-512 bits. Utiliza claves de 160 (SHACAL-1) o 256 bits (SHACAL-2).
In cryptography,
SHACAL-1 and SHACAL-2 are block ciphers based on cryptographic hash functions
from the SHA family. They were designed by Helena Handschuh and David Naccache
of the smart card manufacturer Gemplus.
SHACAL-1
(originally simply SHACAL) is a 160-bit block cipher based on SHA-1, and
supports keys from 128-bit to 512-bit. SHACAL-2 is a 256-bit block cipher based
upon the larger hash function SHA-256.
http://en.wikipedia.org/wiki/SHACAL-2
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