Journal of South China University of Technology(Natural Science) >

2010 , Vol. 38 >Issue 5: 86 - 89

DOI: https://doi.org/10.3969/j.issn.1000-565X.2010.05.017

Computer Science & Technology

Break of the C＊- Scheme Symmetry Caused by Projection

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  • 1.Key Laboratory of Computer Networks and Information Security,Ministry of Education,Xidian University,Xi＇an 710071,Shaanxi,China;2.Key Laboratory of Information Security,Beijing Electronic Science and Technology Institute,Beijing 100070,China
袁峰（1982-），男，博士生，主要从事公钥密码学研究．

Received date: 2009-05-31

  Revised date: 2009-11-18

  Online published: 2010-05-25

Supported by

国家“973”计划项目（2007CB311201）; 国家自然科学基金资助项目（60970119 60803149）

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Abstract

The SFLASH cryptographic scheme is a C＊-scheme with specific parameters.It has been broken by Dubois et al with differential cryptanalytic attacks.This paper reviews the basic attacks to the SFLASH scheme,and points out that a successful attack mainly depends on the symmetry of the SFLASH scheme.Moreover,the symmetry of the C＊-scheme is investigated,and the fact that projection can break the symmetry of the C＊-scheme is also strictly proved.The results indicate that the SFLASH scheme with projection can effectively withstand diffe-rential attacks.

Key words： cryptography; public key cryptography; polynomials; mapping; multivariate; symmetry; projection; C＊-scheme

Cite this article

Yuan Feng Hu Yu-pu Ou Hai-wen Zhao Dong . Break of the C＊- Scheme Symmetry Caused by Projection[J]. Journal of South China University of Technology(Natural Science), 2010 , 38(5) : 86 -89 . DOI: 10.3969/j.issn.1000-565X.2010.05.017

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