## CryptoDB

### Paper: Breaking the Symmetry: a Way to Resist the New Differential Attack

Authors: Jintai Ding Bo-Yin Yang Chen-Mou Cheng Owen Chen Vivien Dubois URL: http://eprint.iacr.org/2007/366 Search ePrint Search Google 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
}