| CLEFIA密码的Square攻击 |
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| 引用本文： | 唐学海,李超,谢端强.CLEFIA密码的Square攻击[J].电子与信息学报,2009,31(9):2260-2263. |
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| 作者姓名： | 唐学海 李超 谢端强 |
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| 作者单位： | 1. 国防科技大学数学与系统科学系,长沙,410073
2. 国防科技大学数学与系统科学系,长沙,410073;东南大学移动通信国家重点实验室,南京,210096 |
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| 基金项目： | 国家自然科学基金，东南大学移动通信国家重点实验室开放基金(w200805)资助课题 |
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| 摘 要： | 该文根据CLEFIA密码的结构特性，得到了Square攻击的新的8轮区分器，并指出了设计者提出的错误8轮区分器。利用新的8轮区分器对CLEFIA密码进行了10到12轮的Square攻击，攻击结果如下:攻击10轮CLEFIA-128\192\256的数据复杂度和时间复杂度分别为297和292.7；攻击11轮CLEFIA-192\256的数据复杂度和时间复杂度分别为298和2157.6；攻击12轮CLEFIA-256的数据复杂度和时间复杂度分别为298.6和2222。攻击结果表明:在攻击10轮CLEFIA时，新的Square攻击在数据复杂度和时间复杂度都优于设计者给出的Square攻击。
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| 关 键 词： | 密码 CLEFIA 区分器 Square攻击 |
| 收稿时间： | 2008-9-19 |
| 修稿时间： | 2009-4-28 |
Square Bttack on CLEFIA |
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| Tang Xue-hai Li Chao Xie Duan-qiang.Square Bttack on CLEFIA[J].Journal of Electronics & Information Technology,2009,31(9):2260-2263. |
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| Authors: | Tang Xue-hai Li Chao Xie Duan-qiang |
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| Affiliation: | Department of Mathematics and System Science, National University of Defense Technology, Changsha 410073, China; National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China |
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| Abstract: | According to the structure properties of CLEFIA , new 8-round distinguishers for Square attack are presented, and the wrong 8-round distinguishers originally found by the designers are pointed out. Based on the new distinguisher, the square attack on CLEFIA can be improved as follows: 10-round CLEFIA-128\192\256 is attacked with data complexity 297 and time complexity 292.7, 11-round CLEFIA-192/256 is attacked with data complexity 298 and time complexity 2157.6, and 12-round CLEFIA-256 is breakable with data complexity 298.6 and time complexity 2222. These results demonstrate that under the case of 10-round CLEFIA, both data and time complexity of our attack are better than those given by the designers. |
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| Keywords: | Cryptograph CLEFIA Distinguisher Square attack |
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