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| 对低轮AES-256的相关密钥-不可能差分密码分析 |
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张文涛1, 吴文玲2, 张蕾2
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1.中国科学院,研究生院,信息安全国家重点实验室,北京,100049;2.中国科学院,软件研究所,信息安全国家重点实验室,北京,100080
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| 摘要: |
| 研究AES-256抵抗相关密钥-不可能差分密码分析的能力.首先给出相关密钥的差分,该差分可以扩展到8轮(甚至更多轮)子密钥差分;然后构造出一个5.5轮的相关密钥不可能差分特征.最后,给出一个对7轮AES-256的攻击和4个对8轮AES-256的攻击. |
| 关键词: AES-256 密码分析 相关密钥差分 不可能差分 |
| DOI： |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos.60373047, 90604036 (国家自然科学基金); the National Basic Research Program of China under Grant No.2004CB318004 (国家重点基础研究发展计划(973)); the National High-Tech Research and Development Plan of China under Grant No.2007AA01Z470 (国家高技术研究发展计划(863)) |
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| Related-Key Impossible Differential Attacks on Reduced-Round AES-256 |
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ZHANG Wen-Tao,WU Wen-Ling,ZHANG Lei
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| Abstract: |
| In this paper,the strength of AES-256 against the related-key impossible differential attack is examined. Firstly,a carefully chosen relation between the related keys is presented,which can be extended to 8-round(even more rounds)subkey differences.Then,a 5.5-round related-key impossible differential is constructed.Finally,an attack on 7-round AES-256 and four attacks on 8-round AES-256 are presented. |
| Key words: AES-256 cryptanalysis related-key differential impossible differential |
