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Title:
a real-time key recovery attack on the lightweight stream cipher a2u2
Author: Shi Zhenqing ; Feng Xiutao ; Feng Dengguo ; Wu Chuankun
Source: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Conference Name: 11th International Conference on Cryptology and Network Security, CANS 2012
Conference Date: December 12, 2012 - December 14, 2012
Issued Date: 2012
Conference Place: Darmstadt, Germany
Keyword: Network security ; Recovery
Indexed Type: EI
ISSN: 0302-9743
ISBN: 9783642354038
Department: (1) Institute of Software Chinese Academy of Sciences Beijing 100190 China; (2) Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China; (3) Institute of Information Engineering Chinese Academy of Sciences Beijing 100195 China
Abstract: The stream cipher A2U2 proposed by David et al. [7] is one of lightweight cipher primitives. In this paper we present a real-time key recovery attack on A2U2 under the known-plaintext-attack model, which only needs at most 210 consecutive ciphertext bits and its corresponding plaintext with the time complexity about 224.7. Our result is much better than that of the attack proposed by M. Abdelraheem et al. in [9] whose complexity is O(2 49 x C), where C is the complexity of solving a sparse quadratic equation system on 56 unknown key bits. Furthermore we provide a new approach to solving the above sparse quadratic equation system, which reduces the complexity C to a very small constant. Finally we do an entire experiment on a PC and recover all bits of a random key in a few seconds. © Springer-Verlag 2012.
English Abstract: The stream cipher A2U2 proposed by David et al. [7] is one of lightweight cipher primitives. In this paper we present a real-time key recovery attack on A2U2 under the known-plaintext-attack model, which only needs at most 210 consecutive ciphertext bits and its corresponding plaintext with the time complexity about 224.7. Our result is much better than that of the attack proposed by M. Abdelraheem et al. in [9] whose complexity is O(2 49 x C), where C is the complexity of solving a sparse quadratic equation system on 56 unknown key bits. Furthermore we provide a new approach to solving the above sparse quadratic equation system, which reduces the complexity C to a very small constant. Finally we do an entire experiment on a PC and recover all bits of a random key in a few seconds. © Springer-Verlag 2012.
Language: 英语
Content Type: 会议论文
URI: http://ir.iscas.ac.cn/handle/311060/15845
Appears in Collections:软件所图书馆_会议论文

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Recommended Citation:
Shi Zhenqing,Feng Xiutao,Feng Dengguo,et al. a real-time key recovery attack on the lightweight stream cipher a2u2[C]. 见:11th International Conference on Cryptology and Network Security, CANS 2012. Darmstadt, Germany. December 12, 2012 - December 14, 2012.
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