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.
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Dubois, V., Fouque, PA., Shamir, A., Stern, J. (2007). Practical Cryptanalysis of SFLASH. In: Menezes, A. (eds) Advances in Cryptology - CRYPTO 2007. CRYPTO 2007. Lecture Notes in Computer Science, vol 4622. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74143-5_1
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