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arXiv 0910.4632cs.CRcs.ITmath.IT
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对称布尔函数的快速代数攻击与分解

Fast Algebraic Attacks and Decomposition of Symmetric Boolean Functions

Meicheng Liu, Dongdai Lin

摘要:

代数攻击和快速代数攻击是分析流密码的有力工具。在EUROPHOTOPT '06上,发现了一类具有最大代数免疫度的对称布尔函数容易受到快速代数攻击。最近,AAR(代数攻击抵抗)功能的概念被引入作为一个统一的措施,对经典的代数和快速代数攻击的保护。本文首先给出了对称布尔函数的一个分解,然后证明了几乎所有的对称布尔函数,包括具有良好代数免疫性的函数,在快速代数攻击下的表现都很差,并且证明了没有对称布尔函数是AAR函数.此外,我们改进了对称布尔函数的代数次数与代数免疫度之间的关系。

英文摘要:

Algebraic and fast algebraic attacks are power tools to analyze stream ciphers. A class of symmetric Boolean functions with maximum algebraic immunity were found vulnerable to fast algebraic attacks at EUROCRYPT'06. Recently, the notion of AAR (algebraic attack resistant) functions was introduced as a unified measure of protection against both classical algebraic and fast algebraic attacks. In this correspondence, we first give a decomposition of symmetric Boolean functions, then we show that almost all symmetric Boolean functions, including these functions with good algebraic immunity, behave badly against fast algebraic attacks, and we also prove that no symmetric Boolean functions are AAR functions. Besides, we improve the relations between algebraic degree and algebraic immunity of symmetric Boolean functions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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