RSA踪迹驱动指令Cache计时攻击研究  

Research on Trace Drive Instruction Cache Timing Attack on RSA

作　　者：陈财森[1,2] 王韬[1] 郭世泽[3] 周平[1] 

机构地区：[1]军械工程学院信息工程系,河北石家庄050003 [2]装甲兵工程学院,北京100072 [3]北方电子设备研究所,北京100083

出　　处：《软件学报》2013年第7期1683-1694,共12页Journal of Software

基　　金：国家自然科学基金(60772082);河北省自然科学基金(08M010)

摘　　要：指令Cache攻击是基于获取算法执行路径的一种旁路攻击方式.首先,通过分析原有RSA指令Cache计时攻击存在可行性不高且能够获取的幂指数位不足等局限性,建立了新的基于监视整个指令Cache而不只是监视特定指令Cache的踪迹驱动计时攻击模型;然后,提出了一种改进的基于SWE算法窗口大小特征的幂指数分析算法;最后,在实际环境下,利用处理器的同步多线程能力确保间谍进程与密码进程能够同步运行.针对OpenSSLv.0.9.8f中的RSA算法执行指令Cache计时攻击实验,实验结果表明:新的攻击模型在实际攻击中具有更好的可操作性;改进的幂指数分析算法能够进一步缩小密钥搜索空间,提高了踪迹驱动指令Cache计时攻击的有效性.对于一个512位的幂指数,新的分析算法能够比原有分析算法多恢复出大约50个比特位.The I-cache timing attack which exploits the instruction path of a cipher is one type of side channel attack. First, by analyzing the complications in the previous I-cache timing attacks on RSA algorithm because of how hard it has been to put them into practice, and how the number of the inferred bits is insufficient, this paper builds a new trace driven I-cache timing attack model via spying on the whole l-cache, instead targeting the instruction cache to which the special function mapped. Next, an improved analysis algorithm of the exponent based on the characteristic of the side of window in sliding window exponentiation （SWE） algorithm is proposed. Finally, an I-cache timing attack is implemented on RSA of OpenSSL v.0.9.8f in a practical environment, using a simultaneous multithreading processor to insure that the spy process and the cipher process can run in parallel. Experimental results show that the proposed attack model has strong applicability in real environments; the improved analysis algorithm of the exponent can further reduce the search space of the bits of the key, and improve the effectively of the trace driven I-cache timing attack. For a 512-bit exponent, it can recover about 50 bits of exponent more than the previous.

关 键 词：指令Cache计时攻击 旁路攻击 RSA密码算法 踪迹驱动 同步多线程 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]