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Breaking the Symmetry: a Way to Resist the New Differential Attack
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Abstract: | Sflash had recently been broken by Dubois, Stern, Shamir, etc., using a differential attack on the public key. The $C^{\ast-}$ signature schemes are hence no longer practical. In this paper, we will study the new attack from the point view of symmetry, then (1) present a simple concept (projection) to modify several multivariate schemes to resist the new attacks; (2) demonstrate with practical examples that this simple method could work well; and (3) show that the same discussion of attack-and-defence applies to other big-field multivariates. The speed of encryption schemes is not affected, and we can still have a big-field multivariate signatures resisting the new differential attacks with speeds comparable to Sflash. |
BibTeX
@misc{eprint-2007-13646, title={Breaking the Symmetry: a Way to Resist the New Differential Attack}, booktitle={IACR Eprint archive}, keywords={public-key cryptography /}, url={http://eprint.iacr.org/2007/366}, note={multivariate public key cryptography,differential, symmetry, projection ding@math.uc.edu 13769 received 13 Sep 2007}, author={Jintai Ding and Bo-Yin Yang and Chen-Mou Cheng and Owen Chen and Vivien Dubois}, year=2007 }