时间攻击的研究进展

Advances in Research on Timing Attack

时间攻击是边界信道攻击的一种重要方法,与传统的密码分析方法不同,它通过分析加密过程中泄漏出的时间信息来获取密钥。文中给出了时间攻击的形式化定义,归纳了国际上的最新研究成果,剖析了时间攻击的实施条件和基本步骤,并结合分组密码给出了可能存在时间攻击的基本操作和模块,总结提出了时间攻击的防范方法。最后,对当前该领域的研究现状作了评述和展望。

Timing attack is one of the most important methods of side channel attack at present. Distinguished from traditional cryptanalysis, timing attack occurs when an attacker is able to use some additional timing information leaked from physical devices. So it is possible to break ciphers. Our study not only summarizes the latest advances in international research, but also proposes formal definition of timing attack, including its implementation environment and basic steps. Then we pay attention to investigating operations and modules of block cipher which could lead to timing attack. And some countermeasures to timing attack are surveyed. Subsequently, the potential research advances are presented so as to draw our attention.