Details:
Title  A geometric view of cryptographic equation solving.  Author(s)  M.B. Paterson, Murphy Sean  Type  Article in Journal  Abstract  This paper considers the geometric properties of the Relinearisation algorithm and of the XL algorithm used in cryptology for equation solving. We give a formal description of each algorithm in terms of projective geometry, making particular use of the Veronese variety. We establish the fundamental geometrical connection between the two algorithms and show how both algorithms can be viewed as being equivalent to the problem of finding a matrix of low rank in the linear span of a collection of matrices, a problem sometimes known as the MinRank problem. Furthermore, we generalise the XL algorithm to a geometrically invariant algorithm, which we term the GeometricXL algorithm. The GeometricXL algorithm is a technique which can solve certain equation systems that are not easily soluble by the XL algorithm or by Groebner basis methods.  Keywords  Projective Geometry; Veronese Variety; Determinantal Variety; Multivariate Polynomials; Cryptology; Linearisation; Relinearisation; XL Algorithm; GeometricXL Algorithm  ISSN  18622976; 18622984/e 
URL 
http://www.degruyter.com/view/j/jmc.2008.2.issue1/jmc.2008.004/jmc.2008.004.xml 
Language  English  Journal  J. Math. Cryptol.  Volume  2  Number  1  Pages  63107  Publisher  De Gruyter, Berlin  Year  2008  Edition  0  Translation 
No  Refereed 
No 
