Cryptology ePrint Archive: Report 2021/1046

On the modifier Q for multivariate signature schemes

Yasufumi Hashimoto

Abstract: At PQCrypto 2021, Smith-Tone proposed a new modifier, called Q'', to construct a fast multivariate signature scheme from a known scheme. In the present paper, we propose an idea to weaken the security of this modifier.

Category / Keywords: public-key cryptography / multivariate public-key cryptosystems, modifier Q