【摘要】 Midori是ASIACRYPT 2015上提出的一种轻量级分组密码,采用积分攻击的方法对Midori的安全性其进行分析。提出Midori64算法的4轮积分区分器,向解密方向扩展一轮得到5轮积分区分器,利用5轮区分器对Midori64进行了6轮、7轮和8轮攻击。其中:6轮攻击的数据复杂度和时间复杂度分别为217和216; 7轮攻击的数据复杂度和时间复杂度分别为218. 32和218. 23次7轮加密; 8轮攻击的数据复杂度为210. 80个明文,时间复杂度为265次8轮加密。据查证,这是首次评估Midori64算法在积分攻击方面的安全性。更多还原

【Abstract】 Midori is a lightweight block cipher proposed at ASIACRYPT 2015. In this paper,we used the method of integral attack to analyze the safety of Midori. A 4-round integral distinguisher was presented on Midori64 and then 5-round integral distinguisher was obtained by extending the decryption direction. 6 rounds,7 rounds and 8 rounds of attacks on Midori64 were carried out with 5 rounds of distinguisher. The data complexity and the time complexity of 6 rounds of attacks are respectively 217 and 216 times 6-round encryptions. Those of 7 rounds of attacks are 218. 32 and 218. 23 respectively. Those of 8 rounds of attacks are 219. 80 and 265 respectively. It is verified that this is the first time to evaluate the security of Midori64 algorithm in integral attacks.更多还原