[Resource Topic] 2003/220: A short comment on the affine parts of SFLASH^{v3}

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A short comment on the affine parts of SFLASH^{v3}

Authors: Willi Geiselmann, Rainer Steinwandt


In [SFLASHv3, a fast asymmetric signature scheme] SFLASH^{v3} is presented, which supersedes SFLASH^{v2}, one of the digital signature schemes in the NESSIE Portfolio of recommended cryptographic primitives. We show that a known attack against the affine parts of SFLASH^{v1} and SFLASH^{v2} carries over immediately to the new version SFLASH^{v3}: The 861 bit representing the affine parts of the secret key can easily be derived from the public key alone.

ePrint: https://eprint.iacr.org/2003/220

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