一种SMS4加密算法差分功耗攻击

Differential Power Analysis Attacks on SMS4

针对SMS4加密电路,采用差分功耗分析攻击方式进行密钥破解。该攻击方法是一种典型的加密芯片旁路攻击方式,其理论基础为集成电路中门电路在实现加密算法时的物理特征、功耗模型及数据功耗相关性。结合中国第一个商用密码算法SMS4,详细介绍了针对SMS4加密系统进行差分功耗分析攻击的设计与实现。开发了相应的仿真实验验证平台,实验验证成功破解了SMS4加密算法的密钥,从而给SMS4加密算法研究者提供了有益的安全设计参考。实验表明,未加防护措施的SMS4加密系统难以抵御差分功耗分析的攻击。

The paper introduced Differential Power Analysis （DPA） attack of the decrypt encrypted circuits with SMS4, it is one particularly powerful type of Side Channel Attacks （SCA）. All its theories are based upon the physical characters, power consumption models and data-dependent power consumption of CMOS logic gates which form the integrated circuits （ICs）. The paper introduced the design and realization of DPA attacks of SMS4. Correct secret key of encryption algorithm is cracked successfully with experiments. It comes gradually and closely into ultimate target of the attack. The result indicates that SMS4 encrypted systems without some extra protective measures can＇ t resist the attacks of DPA, because of the leakages from the physical signals and the difference of power consumption while processing the different data of ICs. The results can give the researchers to provide a useful reference for the safety design.