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Paper 2007/141

Practical Cryptanalysis of SFLASH

Vivien Dubois and Pierre-Alain Fouque and Adi Shamir and Jacques Stern

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.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
Cryptanalysis multivariate schemes
Contact author(s)
Pierre-Alain Fouque @ ens fr
History
2007-04-20: received
Short URL
https://ia.cr/2007/141
License
Creative Commons Attribution
CC BY
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