On Asymptotic Security Estimates in XL and Gröbner Boses Related Algebraic Analysis

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Title:	On Asymptotic Security Estimates in XL and Gröbner Boses Related Algebraic Analysis
Authors:	楊柏因;陳君明;Courtois, N.
Contributors:	淡江大學數學學系
Keywords:	XL;Gröbner Bases;multivariate quadratics;algebraic cryptanalysis;asymptotic security estimates
Date:	2004-10
Issue Date:	2011-10-01 23:43:59 (UTC+8)
Publisher:	國際資通安全學會
Abstract:	“Algebraic Cryptanalysis” against a cryptosystem often comprises finding enough relations that are generally or probabilistically valid, then solving the resultant system. The security of many schemes (most important being AES) thus depends on the difficulty of solving multivariate polynomial equations. Generically, this is NP-hard. The related methods of XL (EXTENDED LINEARIZATION), Gröbner Bases, and their variants (of which a large number has been proposed) form a unified approach to solving equations and thus affect our assessment and understanding of many cryptosystems. Building on prior theory, we analyze these XL variants and derive asymptotic formulas giving better security estimates under XL-related algebraic attacks; through this examination we have hopefully improved our understanding of such variants. In particular, guessing a portion of variables is a good idea for both XL and Gröbner Bases methods.
Relation:	第六屆國際資通安全會議, Malaga, Spain
DOI:	10.1007/978-3-540-30191-2_31
Appears in Collections:	[Graduate Institute & Department of Mathematics] Proceeding

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