International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Practical Cryptanalysis of SFLASH

Vivien Dubois
Pierre-Alain Fouque
Adi Shamir
Jacques Stern
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Abstract: In this paper, we present a practical attack on the signature scheme SFLASH proposed by Patarin, Goubin and Courtois in 2001 following a design they had introduced in 1998. The attack only needs the public key and requires about one second to forge a signature for any message, after a one-time computation of several minutes. It can be applied to both SFLASHv2 which was accepted by NESSIE, as well as to SFLASHv3 which is a higher security version.
  title={Practical Cryptanalysis of SFLASH},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / Cryptanalysis multivariate schemes},
  note={ 13623 received 20 Apr 2007},
  author={Vivien Dubois and Pierre-Alain Fouque and Adi Shamir and Jacques Stern},