%0 Journal Article
%T A Nonrepudiable Threshold Proxy Signcryption Scheme with Known Proxy Agent<br>具有已知代理人的不可否认门限代理签密方案
%A LI Ji-Guo
%A LI Jian-Zhong
%A CAO Zhen-Fu
%A ZHANG Yi-Chen
%A <br>李继国
%A 李建中
%A 曹珍富
%A 张亦辰
%J 软件学报
%D 2003
%I 
%X In 1996, Mambo et al. introduced the concept of proxy signature. However, a proxy signature only provides the delegated authenticity and doesn't provide the confidentiality. Chan and Wei proposed a threshold proxy signcryption scheme (denoted as Chan-Wei scheme), which extended the concept of proxy signature. In this paper, the authors demonstrate Chan-Wei scheme does not satisfy strong unforgeablity, strong nonrepudiation and strong identifiability. Based on Chan-Wei scheme, a nonrepudiable threshold proxy signcryption scheme with known proxy agents is proposed. The proposed scheme overcomes the weaknesses of Chan-Wei scheme. Completeness proof and security analysis of the proposed scheme are presented. In addition, compared with Chan-Wei scheme, the proposed scheme exactly finds out which proxy agents present bogus secret shadow or tamper secret shadow.
%K proxy signcryption
%K proxy signature
%K threshold cryptography
%K discrete logarithm
%K nonrepudiation<br>代理签密
%K 代理签名
%K 门限密码学
%K 离散对数
%K 不可否认性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7735F413D429542E610B3D6AC0D5EC59&aid=AEFD44C8E2FC1D77&yid=D43C4A19B2EE3C0A&vid=F3583C8E78166B9E&iid=59906B3B2830C2C5&sid=9475FABC7A03F4AB&eid=8E60891DE9EC9643&journal_id=1000-9825&journal_name=软件学报&referenced_num=6&reference_num=19