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Zodiac密码算法的多维零相关线性分析

Multidimensional zero-correlation linear cryptanalysis on Zodiac cipher algorithm
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摘要 分组密码算法Zodiac支持3种密钥长度,分别为Zodiac-128、Zodiac-192、Zodiac-256。利用零相关线性分析方法评估了Zodiac算法的安全性,首先根据算法的结构特性,构造了一些关于Zodiac算法的10轮零相关线性逼近,然后对16轮Zodiac-192进行了多维零相关分析。分析结果显示:攻击过程中一共恢复了19个字节的密钥,其数据复杂度约为2^(124.40)个明密文对,计算复杂度为2^(181.58)次16轮加密。由此可得:16轮(即全轮)192 bit密钥的Zodiac算法(Zodiac-192)对于零相关线性分析方法是不安全的。 Zodiac is a block cipher algorithm and it supports 3 master key lengths which are called Zodiac-128, Zodiac- 192 and Zodiac-256. The security of Zodiac algorithm was evaluated by using zero-correlation linear cryptanalysis. Firstly, 10- round zero-correlation linear approximations of Zodiac algorithm were constructed according to the structural characteristics of the algorithm. Then, the multidimensional zero-correlation linear cryptanalysis on 16-round Zodiac-192 was conducted. The analysis results show that 19-byte keys were restored totally in the process of attack, the data complexity was about 2124.40 known ciphertexts and the computational complexity was 2ross encryptions of 16-round. Thus the Zodiac-192 algorithm with the 192-bit key of 16 rounds (full rounds) is not immune to the zero-correlation linear cryptanalysis.
出处 《计算机应用》 CSCD 北大核心 2017年第6期1605-1608,1624,共5页 journal of Computer Applications
基金 国家自然科学基金资助项目(61202492 61572521) 信息保障技术国家重点实验室开放基金(KJ-15-010) 陕西省自然科学基金资助项目(2016JQ6030)~~
关键词 分组密码 Zodiac密码算法 线性掩码 线性逼近 零相关线性分析 block cipher Zodiac cipher algorithm linear mask linear approximation zero-correlation linearcryptanalysis
作者简介 程璐(1992-),男,河北衡水人,硕士研究生,主要研究方向:信息安全、密码学 魏悦川(1982-),女,天津人,副教授,博士,主要研究方向:密码学 潘晓中(1964-),男,陕西西安人,教授,硕士,主要研究方向:信息安全 李安辉(1993-),男,湖南常德人,硕士研究生,主要研究方向:信息安全、复杂网络。
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