Cryptanalysis of SFLASH with Slightly Modified Parameters - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Conference Papers Year : 2007

Cryptanalysis of SFLASH with Slightly Modified Parameters


SFLASH is a signature scheme which belongs to a family of multivariate schemes proposed by Patarin et al. in 1998. The SFLASH scheme itself has been designed in 2001 and has been selected in 2003 by the NESSIE European Consortium as the best known solution for implementation on low cost smart cards. In this paper, we show that slight modifications of the parameters of SFLASH within the general family initially proposed renders the scheme insecure. The attack uses simple linear algebra, and allows to forge a signature for an arbitrary message in a question of minutes for practical parameters, using only the public key. Although SFLASH itself is not amenable to our attack, it is worrying to observe that no rationale was ever offered for this ?lucky? choice of parameters.
Fichier principal
Vignette du fichier
euro07.pdf (156.89 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

inria-00556692 , version 1 (17-01-2011)



Vivien Dubois, Pierre-Alain Fouque, Jacques Stern. Cryptanalysis of SFLASH with Slightly Modified Parameters. Advances in Cryptology - EUROCRYPT 2007, 26th Annual International Conference on the Theory and Applications of Cryptographic Techniques, 2007, Barcelona, Spain. pp.264-275, ⟨10.1007/978-3-540-72540-4_15⟩. ⟨inria-00556692⟩
110 View
112 Download



Gmail Facebook Twitter LinkedIn More