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| A New Method for Impossible Differential Cryptanalysis of 8-Round Advanced Encryption Standard | |
| 引用本文： | CHEN Jie HU Yupu WEI Yongzhuang. A New Method for Impossible Differential Cryptanalysis of 8-Round Advanced Encryption Standard[J]. 武汉大学学报:自然科学英文版, 2006, 11(6): 1559-1562. DOI: 10.1007/BF02831820 |
| 作者姓名： | CHEN Jie HU Yupu WEI Yongzhuang |
| 作者单位： | Key Laboratory of Computer Network and Information Security, Ministry of Education, Xidian University, Xi＇an 710071, Shaanxi, China |
| 基金项目： | Supported by the Foundation of National Laboratory for Modern Communications （51436030105DZ0105） |
| 摘 要： | This paper first presents an impossible differential property for 5-round Advanced Encryption Standard （AES） with high probability. Based on the property and the impossible differential cryptanalytic method for the 5-round AES, a new method is proposed for cryptanalyzing the 8-round AES-192 and AES-256. This attack on the reduced 8-round AES-192 demands 2^121 words of memory, and performs 2^148 8-round AES-192 encryptions. This attack on the reduced 8-round AES-256 demands 2^153 words of memory, and performs 2^180 8-round AES-256 encryptions. Furthermore, both AES-192 and AES-256 require about 2^98 chosen plaintexts for this attack, and have the same probability that is only 2^-3 to fail to recover the secret key. |
| 关 键 词： | 差分密码分析 加密 密码术 保密通信 |
| 文章编号： | 1007-1202（2006）06-1559-04 |
| 收稿时间： | 2006-05-20 |
A new method for impossible differential cryptanalysis of 8-round advanced encryption standard |
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| Chen Jie,Hu Yupu,Wei Yongzhuang. A new method for impossible differential cryptanalysis of 8-round advanced encryption standard[J]. Wuhan University Journal of Natural Sciences, 2006, 11(6): 1559-1562. DOI: 10.1007/BF02831820 | |
| Authors: | Chen Jie Hu Yupu Wei Yongzhuang |
| Affiliation: | (1) Kev Laboratory of Computer Network and Information Security, Ministry of Education, Xidian University, 710071 Xi'an, Shaanxi, China |
| Abstract: | This paper first presents an impossible differential property for 5-round Advanced Encryption Standard (AES) with high probability. Based on the property and the impossible differential cryptanalytic method for the 5-round AES, a new method is proposed for cryptanalyzing the 8-round AES-192 and AES-256. This attack on the reduced 8-round AES-192 demands 2~ 121 words of memory, and performs 2~ 148 8-round AES-192 encryptions. This attack on the reduced 8-round AES-256 demands 2~ 153 words of memory, and performs 2~ 180 8-round AES-256 encryptions. Furthermore, both AES-192 and AES-256 require about 2~ 98 chosen plaintexts for this attack, and have the same probability that is only 2~ -3 to fail to recover the secret key. |
| Keywords: | impossible differential cryptanalysis cryptanalysis Advanced Encryption Standard |
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