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物联网和RFID等设备的普及给密码学提出了新的要求,为了能够在资源受限的传感节点上实施通信保护和隐私保护,大量轻量级加密算法被提出。mCrypton是明文分组长度为64 bit的轻量级分组密码算法,共有3种可用密钥长度:64 bit、96 bit和128bit。本文提出了针对mCrypton-96的4轮mCrypton不可能差分路径和7轮mCrypton的不可能差分分析,同时利用了mCryption的S盒性质和密钥生成算法的弱点对不可能差分分析进行了改进,实验结果表明和传统的差分分析相比,本文提出的不可能差分分析方法降低了攻击的时间复杂度和数据复杂度。
The popularization of devices such as Internet of Things and RFID has put forward new requirements for cryptography. In order to implement communication protection and privacy protection on resource-limited sensor nodes, a large number of lightweight encryption algorithms are proposed. mCrypton is a plaintext packet-size 64-bit lightweight block cipher algorithm that has three available key lengths: 64 bit, 96 bit, and 128 bit. In this paper, the impossibility of differential impossibility of 4-round mCrypton-impossible path and 7-round mCrypton for mCrypton-96 is proposed. Impossible differential analysis is improved by using the weakness of mCryption’s S-box property and key generation algorithm. The results show that compared with the traditional differential analysis, the proposed impossibility differential analysis method reduces the time complexity and data complexity of the attack.