针对CLEFIA的多字节差分故障分析

Multiple Bytes Differential Fault Analysis on CLEFIA

研究CLEFIA分组密码对多字节差分故障分析的安全性,给出CLEFIA分组密码算法及故障分析原理。根据在第r轮、r-1轮、r-2轮注入多字节故障的3种条件,提出一种新的针对CLEFIA的多字节故障模型及分析方法。通过仿真实验进行验证,结果表明,由于其Feistel结构和S盒特性,CLEFIA易遭受多字节故障攻击,68个错误密文可恢复128 bit的CLEFIA密钥。

This paper examines the strength of CLEFIA block cipher against multiple bytes differential fault attack.It presents a principle of CLEFIA and differential fault analysis.According to inject faults into the rth,r-1th,r-2th round three conditions,it proposes a new fault analysis method on CLEFIA based on multiple bytes fault model,and verifies it through software simulation.Experimental result demonstrates that due to its Feistel structure and S-box feature,CLEFIA is vulnerable to multiple bytes fault attack,68 faulty ciphertexts are needed to recover full 128 bit key.