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电子学报  2015 

LBlock算法的相关密钥-不可能差分攻击

DOI: 10.3969/j.issn.0372-2112.2015.10.011, PP. 1948-1953

Keywords: 分组密码,密码分析,LBlock算法,相关密钥-不可能差分攻击

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Abstract:

该文研究了LBlock分组密码算法在相关密钥-不可能差分条件下的安全性.利用子密钥生成算法的差分信息泄漏规律,构造了多条低重量子密钥差分链,给出了15轮相关密钥-不可能差分区分器.通过扩展区分器,给出了23轮和24轮LBlock算法的相关密钥-不可能差分攻击方法.攻击所需的数据复杂度分别为265.2和265.6个选择明文,计算复杂度分别为266.2次23轮LBlock算法加密和266.6次24轮LBlock算法加密,存储复杂度分别为261.2和277.2字节存储空间.与已有结果相比,首次将针对LBlock算法的攻击扩展到了23轮和24轮.

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