Cryptanalysis of a chaos block cipher for wireless sensor network
Cryptanalysis of a chaos block cipher for wireless sensor network
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DOI：
10.1016/j.cnsns.2010.05.005
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发表时间：
2011-02-01
影响因子：
3.9
通讯作者：
Xiang, Tao
中科院分区：
文献类型：
--
作者：
Yang, Jiyun;Xiao, Di;Xiang, Tao
通过对无线传感器网络（WSN）混沌分组密码的分析，发现其存在轮数过少、轮函数计算精度过短等致命的安全缺陷。利用差分密码分析理论对该方案进行密码分析。首先，根据轮函数的特点，选择明文攻击恢复第三轮密钥。然后，根据第二轮和第三轮之间的子密钥关系，推导出第二轮密钥。基于以上成功的攻击，第一轮密钥也可以被暴力破解。最后，利用festel结构的特性，也可以得到第四轮密钥。由于所有的圆密钥都被加密分析过，那么明文就可以被解密。结果表明该加密方案是不安全的。(C) 2010 Elsevier B.V.版权所有
Based on the analysis of a chaos block cipher for wireless sensor network (WSN), it is found that there is a fatal flaw in its security because the number of rounds is too small and the calculation precision of round function is too short. The scheme could be cryptanalyzed by utilizing differential cryptanalysis theory. First, the third round key is recovered by chosen plaintext attack according to the characteristics of the round function. Then, the second round key can be deduced from the relationship of the sub-keys between the second and the third rounds. Based on the above successful attacks, the first round key could also be broken by brute-force attack. Finally, by employing the characteristics of Feistel structure, the fourth round key could also be obtained. Since all round keys have been cryptanalyzed, the plaintext can then be decrypted. The encryption scheme is proven to be insecure consequently. (C) 2010 Elsevier B.V. All rights reserved.