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中文摘要：
作为欧洲流密码发展计划eSTREAM的7个最终获选算法之一,Trivium的安全性考察表明至今为止还没有出现有效的攻击算法。该文针对2轮Trivium,通过找出更多线性逼近方程,对其进行了多线性密码分析,提出了一种更有效的区分攻击算法。与现有的单线性密码分析算法相比,该算法攻击成功所需的数据量明显减少,即：若能找到n个线性近似方程,在达到相同攻击成功概率的前提下,多线性密码分析所需的数据量只有单线性密码分析的1/n。该研究结果表明,Trivium的设计还存在一定的缺陷,投入实用之前还需要实施进一步的安全性分析。
英文摘要：
Trivium has successfully been chosen as one of the final ciphers by eSTREAM.It has a simple and elegant structure.Although Trivium has attached a lot of interest,it remains unbroken.By finding more linear approximations,a linear cryptanalysis of 2-round Trivium is made by utilizing multiple approximations and a more efficient distinguishing attack is proposed.Compared with current single linear cryptanalysis,this method allows for a reduction in the amount of data required for a successful attack.That is to say,if n linear approximations can be found,this method can supply the success rate with 1/n of the data amount required by a simple linear cryptanalysis.This study shows that there are still some defects in the design of stream cipher Trivium,further safety analysis are needed before its going into the implementation.
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