轻量级分组密码SIMECK多路径不可能差分攻击
首发时间:2017-01-11
摘要:对于CHES2015上提出的新的轻量级分组密码算法Simeck,目前的分析结果主要集中在差分攻击,线性攻击等,而对于该算法在不可能差分攻击下的抵御情况,还没有足够的研究。因此,本文主要分析Simeck算法对不可能差分攻击的抵御情况。首先,对于Simeck算法特殊的非线性组件,提出了简单的由输入差分直接计算输出差分通式和概率的算法;然后根据这一算法,给出了多条不可能差分路径;并且讨论了运用多条路径对攻击复杂度的影响,从而选择最优的路径数减小攻击复杂度。本文对Simeck32/64, Simeck48/96, Simeck64/128给出了新的不可能差分攻击结果,相比原有结果,具有更低的复杂度和更多的可攻击轮数。
关键词: 通信技术 轻量级分组密码 不可能差分分析 Simeck算法。
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Impossible Differential Attacks with multiple trails on Lightweight Block Cipher SIMECK
Abstract:Compared to the numerous results of differential attacks and linear attacks on lightweight block cipher SIMECK which was presented in CHES2015, there is not sufficient research on its resistance ability against impossible differential attack. Therefore, this paper focus on the impossible differential attack results on Simeck. First, considering the special non-linear component in Simeck, this paper presents a convinient algorithm to directly compute all possible output differences ant their posibilities from an input difference. Then, multiple impossible differential trails are founded. Furthermore, this paper discusses the relationship between the number of multiple trails and the complexity of attack so that chooses the optimal number of trails to reduce the attack complexity. Finally, This paper introduces new impossible differential attack results on Simeck32/64, Simeck48/96, Simeck64/128. Compared to previous results, the new results achieve lower complexity and more attacked rounds.
Keywords: Comunication Technology Lightweight Block Cipher Impossible Differential Attack Simeck Algorithm.
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