Multivariate signature scheme designed for speed and for implementation in low-cost devices such as smart cards. Flash, submitted to Nessie, is out of date, no longer recommended, and was replaced by new versions of Sflash.
References:
Interesting links: multivariate cryptanalysis:
Algebraic attacks on AES, Rijndael, Serpent, Camellia, etc.., the XSL attack on block ciphers
Algebraic attacks (or XL attacks) applied to stream ciphers
Interesting links: multivariate cryptography:
The McEliece_based short signature scheme CFS
The HFE cryptosystem home page
The Minrank Zero-knowledge identification scheme
Quartz /Flash /Sflash signature schemes
Nicolas Courtois research page
TTM cryptosystem, GPT cryptosystem