摘要
通过分析高级加密标准(AES)的4轮内部加密特征,推导出一个新的4轮差分路径,该路径存在的可能性为2-30,在该性质的基础上利用不可能差分分析方法,分析了9轮AES_256。该分析方法需要295对明文、约2163个存储单元和约2193加解密运算。通过该分析可以看出AES算法的行列变换的混淆程度不够,这为提升和改进AES安全性提供了理论依据。
Through profound study of the 4-round encryption characteristics of advanced encryption standard （AES）,a new 4-round differential path with an existing probability to of 2-30 has been derived. Based on this path,a novel method was proposed for impossible differential cryptanalysis of 9-round AES_256. The analysis method requires 295 pairs of chosen plaintexts,about 21163 words of memory and 2193 eneryption/decryption computations. According to the analysis process, it was found that the confusing level of the MixColumns transformation in AES algorithm is insufficient, which provides a theoretical basis to improve the AES security.
出处
《计算机科学》
CSCD
北大核心
2014年第8期197-201,共5页
Computer Science
基金
国家自然科学基金(60673071)
湖北省自然科学基金(2012FFC034
2011CDC028
2013CFB473)
湖北省教育厅项目(D20132903)资助
关键词
AES_256
不可能差分分析
差分特征
AES_256, Impossible differential cryptanalysis, Differential character
