【摘要】 通过深入分析Rijndael算法,改进了AES算法的几个有可能产生不安全隐患的步骤.首先是对于最可能被攻击的混列进行优化,使该步骤变成简单的查表而不是域乘,增加了非线形安全性;其次对于子密钥的生成方面引入了随机函数使密钥的生成和选择变成随机性的,而不是原算法简单的线形选择,这样可以较完全抵抗线形密码分析的攻击.更多还原

【Abstract】 Through analyzing the algorithm of Rijndael,some technical points are made in this paper with respect to improving several steps which may incur potential risks.By optimizing the most vulnerable MixColumns,the multiplication in field is replaced with using look-up tables so the security of nonlinearity is enhanced.In regard to creating the sub-key,instead of utilizing the simple linear selection as used in the original algorithm,this paper introduces the random function to generate and choose the keys so that the attacks of linear cryptanalysis can be resisted much more effectively.更多还原