| 韩国加密标准的安全性分析 |
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| 引用本文： | 吴文玲,马恒太,冯登国.韩国加密标准的安全性分析[J].电子学报,2003,31(4):585-588. |
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| 作者姓名： | 吴文玲 马恒太 冯登国 |
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| 作者单位： | 1.中国科学院软件研究所信息安全国家重点实验室,北京 100080;2.中国科学院信息安全技术工程研究中心,北京 100080 |
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| 基金项目： | 国家自然科学基金 (No 60 1 0 30 2 3)，973项目 (No .G1 9990 3580 2 ) |
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| 摘 要： | SEED是韩国的数据加密标准,设计者称用线性密码分析攻击SEED的复杂度为2335.4,而用本文构造的15轮线性逼近攻击SEED的复杂度为2328.为了说明SEED抵抗差分密码分析的能力,设计者首先对SEED的变体SEED*做差分密码分析,指出9轮SEED*对差分密码分析是安全的;利用SEED*的扩散置换和盒子的特性,本文构造SEED*的9轮截断差分,因此10轮SEED*对截断差分密码分析是不免疫的.本文的结果虽然对SEED的实际应用构成不了威胁,但是显示了SEED的安全性并没有设计者所称的那样安全.
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| 关 键 词： | 分组密码 安全性 差分密码分析 线性密码分析 截断差分密码分析 |
| 文章编号： | 0372-2112(2003)04-0585-04 |
| 收稿时间： | 2001-11-09 |
Security on Korean Encryption Standard |
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| WU Wen-ling,MA Heng-tai,FENG Deng-guo.Security on Korean Encryption Standard[J].Acta Electronica Sinica,2003,31(4):585-588. |
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| Authors: | WU Wen-ling MA Heng-tai FENG Deng-guo |
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| Affiliation: | 1.State Key Laboratory of Information Security,Institute of Software,Chinese Academy of Sciences,Beijing 100080,China; 2.Engineering Research Center for Information Security Technology, Chinese Academy of Sciences,Beijing 100080,China |
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| Abstract: | SEED is the Korean encryption standard.It was pointed by designers that the complexity for the linear cryptanalysis of SEED is 2 335.4.Using the linear approximations in this paper,the complexity for the linear cryptanalysis of SEED is 2 328.To analyze the differential cryptanalysis of SEED,the modified SEED was considered.It was pointed out that 9-round modified SEED was secure against the differential cryptanalysis.There are 9-round truncated differentials available to the truncated differential cryptanalysis in the modified SEED.Hence,10-round modified SEED is not immune to truncated differential cryptanalysis.Although the results can not threaten the application of SEED,they show the security of SEED is not as strong as that designers predicted. |
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| Keywords: | block cipher security differential cryptanalysis linear cryptanalysis truncated differential cryptanalysis |
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