一个门限代理签名方案的分析与改进  

Cryptanalysis and Improvement of a Threshold Proxy Signature Scheme

作　　者：胡江红[1] 

机构地区：[1]宝鸡文理学院数学系,宝鸡721013

出　　处：《计算机与数字工程》2012年第5期76-78,共3页Computer & Digital Engineering

基　　金：陕西省教育厅专项科研计划项目(编号:NO.2010JK398);宝鸡文理学院科研计划重点项目(编号:NO.ZK10117)资助

摘　　要：Huang和Chang于2006年提出了一个新的高效门限代理签名方案(简称H-C方案),该方案利用Schnorr数字签名方案实现了代理密钥的分配,产生了代理签名。通过分析发现该方案是不安全的,不能抵抗伪造攻击和公钥替换攻击。最后,给出了改进方案。In 2006, Huang and Chang proposed a novel efficient （t, n）threshold proxy signature scheme （called H-C scheme）. The scheme generated proxy key for each proxy signer based on Schnorr＇s scheme. However, their scheme had some security weaknesses. In this paper, by identifying some concrete instances and analysis, we demonstrate that their scheme was vulnerable to the forgery attack and tile public-key substitute attack. Finally, our improvement is proposed to eliminate the pointed security weaknesses above.

关 键 词：门限代理签名 伪造攻击 公钥替换攻击 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]