Forgery Attacks on Wang＇s Signature Schemes Based on Factoring and Discrete Logarithm  

作　　者：Dezhi Gao Xiangqian Liang 

机构地区：[1]Information Science and Engineering College, Shandong University of Science and Technology,Qingdao 266510, Shandong, China

出　　处：《Journal of Systems Science and Information》2009年第1期43-48,共6页系统科学与信息学报（英文）

基　　金：This project is supported by National Natural Science Foundation of China（60673053）

摘　　要：To enhance the security of signature schemes, Wang proposed two signature schemes based on the difficulties of simultaneously solving the factoring and discrete logarithm＇ problems with almost the same sizes of arithmetic modulus. This paper, firstly, shows that Wang＇s signature scheme 1 do not satisfy the claimed properties. Moreover, we will point out that the all variants of Wang＇s scheme 2 are not secure if attackers can solve discrete logarithm problems.

关 键 词：CRYPTOGRAPHY SECURITY digital signature FACTORING discrete logarithm 

分 类 号：TN918.1[电子电信—通信与信息系统] TP393.08[电子电信—信息与通信工程]