【摘要】 在代理签名方案中,原始签名人将其签名权委托给代理签名人,代理签名人代表原始签名人行使签名权。许多基于Schnorr签名的代理签名方案被提出。但是,其中有一些方案存在着原始签名人假冒代理签名人、伪造代理签名的安全问题。首次使用零知识数字签名的方式进行代理签名,分别提出了两个带有授权书的、保护代理人的代理签名和多重代理签名方案。这两个方案不仅具有强可区分性、强不可否认性,而且具有强不可伪造性,能抵抗原始签名人假冒代理签名人、伪造代理签名攻击。我们的方法可以应用到存在原始签名人伪造的其他ElGamal类代理签名方案。更多还原

【Abstract】 In a proxy signature scheme,the original signer delegates its signing power to the proxy singer. Many proxy signature schemes are proposed on basis of Schnorr signature scheme. However,some proxy schemes are insecure against the original’s forgery attack. In this paper,we first combine signature of zero-knowledge with proxy signature and propose a secure strong proxy signature scheme with warrants and a secure strong multi-proxy signature scheme. These schemes do not only achieve strong distinguishability and non-repudiation properties but also achieve strong unforgeability property. They are still secure against the original signer’s forgery attack. The proposed technique can also be applied to other ElGamal-like proxy signature schemes in which the original signer can impersonate the proxy signer and forge the proxy signature on any message.更多还原