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对5轮IDEA算法的两种攻击 被引量:4

Two Attacks on 5-Round IDEA
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摘要 利用IDEA密钥扩展算法的线性特点,结合IDEA算法的性质提出了两种对5轮IDEA算法的攻击。第1种攻击采用相关密钥的思想,计算复杂度约为270.5次加密5轮IDEA算法;第2种攻击利用密钥特点,攻击5轮仅需要27个选择明文,计算复杂度约为2120次加密5轮IDEA算法。 Using combining theory,the enumeration of Boolean functions with MAI(maximum algebraic immunity) is investigated,and a new lower bound on the number of even-variable Boolean functions with MAI is provided,this lower bound is better than the previous ones.
出处 《北京大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第5期731-735,共5页 Acta Scientiarum Naturalium Universitatis Pekinensis
基金 国家自然科学基金资助项目(60833008)
关键词 分组密码 IDEA 密码分析 相关密钥 block cipher IDEA cryptanalysis related-key
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