Further Analysis of Block Ciphers against Timing Attacks  

作　　者：LI Wei GU Dawu 

机构地区：[1]School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China [2]State Key Laboratory of Modern Communications, Chengdu 610041, Sichuan, China

出　　处：《Wuhan University Journal of Natural Sciences》2006年第6期1629-1632,共4页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foun-dation of China(60573031) ;the Foundation of National Laboratoryfor Modern Communications(51436060205J W0305) ;the Founda-tion of Senior Visiting Scholarship of Fudan University

摘　　要：Timing attacks break a cryptosystem by time measurement to recover keys. Most available countermeasures protect block ciphers based on the safety of modules. This paper gives a complete definition of timing attacks and studies the vulnerability of operations and modules on timing attacks. We present a method to transfer the security of the algorithm to that of secure operations by reduction. As a result, we hopefully tend to reconcile the provable security notions and modem cryptography with real-world implementations of block ciphers.Timing attacks break a cryptosystem by time measurement to recover keys. Most available countermeasures protect block ciphers based on the safety of modules. This paper gives a complete definition of timing attacks and studies the vulnerability of operations and modules on timing attacks. We present a method to transfer the security of the algorithm to that of secure operations by reduction. As a result, we hopefully tend to reconcile the provable security notions and modem cryptography with real-world implementations of block ciphers.

关 键 词：timing attacks block ciphers REDUCTION 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]