摘要
指定签名验证人在实际应用中起着防护签名人敏感信息泄露的重要作用,是数字签名研究的热点.对刘云芳等人提出的指定验证人代理签名方案的进行了研究,指出它存在以下3个问题:(1)代理签名人可以破解原始签名人的私钥;(2)原始签名人可以伪造有效的代理签名;(3)方案不具备签名验证的指定性和抗代理权滥用性.采用区分别名和授权阶段的随机参数、明确授权书内容、嵌入验证人特征和修正代理密钥的方法,提出了一个安全有效的改进方案,它对进一步构造有特殊性质的指定验证人代理签名有一定的指导意义.
Designated verifier signature plays an important role in protecting signer＇s personal sensitive information,which has been becoming a hotspot in the researches of digital signature. Analyze a designatedverifier proxy signature with proxy signer privacy protection presented by Liu, and pointed out that proxy signer can compute the private key of original signer and original signer can forge valid proxy signature and the scheme satisfy the requirements of restrictive verifiability and resistance of misuse proxy right. Based on Liu＇s scheme ,by application different random parameters and improvement of delegation warrant and revision proxy private key structure and addtion of the verifier parameters, a new safe and effective designated-verifier proxy signature was proposed, the improved method has guiding significance and practical application values to further optimal design of some special designated-verifier proxy signature schemes.
出处
《吉林师范大学学报（自然科学版）》
2016年第1期128-131,共4页
Journal of Jilin Normal University:Natural Science Edition
基金
河北省教育厅青年基金项目(QN2014108)
河北师范大学青年基金项目(L2013Q10)
关键词
数字签名
代理签名
指定验证人
安全性分析
digital signature
proxy signature
designated verifier
cryptanalysis
