%0 Journal Article
%T DISCUSSION ON "SECURITY AND PERFORMANCE ANALYSIS OF TWO KINDS OF ELGAMAL SIGNATURE SCHEMES<br>关于“两类ElGamal型数字签名方案的安全性和性能分析”的讨论
%A Shao Zuhua
%A <br>邵祖华
%J 电子与信息学报
%D 2000
%I 
%X Qi Ming and others recently analyzed and discussed the security of two kinds of the ElGamal signature schemes and the password authentication scheme based on two kinds of the signature schemes, and proposed two kinds of improved schemes. This paper first points out that the first p type signature scheme proposed by Qi is not secure, since attackers can forge signature for any message. Then this paper shows that the generalized ElGamal signature schemes can not resist the substitution attack. Finally this paper shows that two kinds of the improved schemes proposed by Qi can not resist the homomorphism attack, and does not have the security as Qi said.
%K Cryptanalysis
%K Digital signature scheme
%K Hormomorphism attack
%K Substitution attack
%K Password authentication<br>密码分析
%K 数字签名方案
%K 同态攻击
%K 代换攻击
%K 通行字认证
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=20BCF03ECB359C77&yid=9806D0D4EAA9BED3&vid=BC12EA701C895178&iid=94C357A881DFC066&sid=9596F7248FB5796B&eid=F90340A344159B2E&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=8