| 引用本文: | 李超,魏悦川.Zodiac算法新的不可能差分攻击.[J].国防科技大学学报,2012,34(5):132-136.[点击复制] |
| LI Chao,WEI Yuechuan.New impossible differential cryptanalysis of Zodiac[J].Journal of National University of Defense Technology,2012,34(5):132-136[点击复制] |
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| Zodiac算法新的不可能差分攻击 |
| 李超1,2, 魏悦川3,4 |
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(1.国防科技大学 理学院, 湖南 长沙 410073;2.
2.国防科技大学 计算机学院, 湖南 长沙 410073;3.2.国防科技大学 计算机学院, 湖南 长沙 410073;4.
3.中国科学院 软件研究所, 北京 100039)
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| 摘要: |
| 重新评估了Zodiac算法抵抗不可能差分攻击的能力。通过分析Zodiac算法的线性层，给出了Zodiac算法两条新的14轮不可能差分。利用新的不可能差分，结合Early-Abort技术对完整16轮的Zodiac算法进行了不可能差分攻击。攻击过程中一共恢复6个字节的密钥，其时间复杂度只有232.6次加密，数据复杂度约为285.6 个明文，该攻击结果与已有最好的结果相比，时间复杂度降低了一个因子233。结果表明由于Zodiac算法线性层的扩散性差，使得该算法对不可能差分分析是不免疫的。 |
| 关键词: Zodiac 不可能差分攻击 攻击复杂度 |
| DOI： |
| 投稿日期：2012-03-02 |
| 基金项目:国家自然科学基金资助项目（61070215, 61103192）；信息安全国家重点实验室开放基金资助项目（01-02-5） |
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| New impossible differential cryptanalysis of Zodiac |
| LI Chao1,2, WEI Yuechuan3,4 |
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(1.College of Science, National University of Defense Technology, Changsha 410073, China;2.
2.College of Computer, National University of Defense Technology, Changsha 410073, China;3.2.College of Computer, National University of Defense Technology, Changsha 410073, China;4.
3.Institute of Software,Chinese Academy of Sciences, Beijing 100039, China)
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| Abstract: |
| The security of block cipher Zodiac against impossible differential cryptanalysis was re-evaluated. By analyzing the properties of diffusion layer P, two new 14-round impossible differentials of Zodiac were introduced. Based on the new impossible differential characteristics and combining with the Early-Abort technique, an effective attack was applied to the full 16-round Zodiac, and the data complexity was 285.6 chosen plaintexts and the time complexity is only 232.6 encryptions. Compared with the previous best result, the time complexity in this paper decreases with a factor of 233. The result shows that Zodiac is vulnerable to impossible differential cryptanalysis due to its poor diffusion. |
| Keywords: Zodiac impossible differential attack complexity |
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