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A Threshold Proxy Signature Scheme with Nonrepudiation and Anonymity

机译:具有不可否认性和匿名性的门限代理签名方案

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摘要

In 2004, Shao pointed out that both Sun et al.'s and Hsu et al.'s threshold proxy signature schemes are vulnerable to coalition attack. For enhancing the security, Shao proposed an improved scheme with anonymity to outsiders. This signature scheme is meaningless to any outsider because there is no way for him to prove each individual proxy signing public key validity. We further propose a practical threshold proxy signature scheme to remedy this drawback. The new scheme has the following advantages: (1) Any verifier can check whether the authors of the proxy signature belong to the designated proxy group by the original signer, while outsiders cannot find the actual signers; (2) The original signer can identify the actual proxy signers; (3) The verification of the proxy signing public keys of the proxy signers and the threshold proxy signature can be accomplished within a signature verification procedure simultaneously.
机译:Shao在2004年指出,Sun等人和Hsu等人的阈值代理签名方案都容易受到联盟攻击。为了增强安全性,邵提出了一种改进的方案,匿名给外部人员。该签名方案对任何局外人都毫无意义,因为他无法证明每个单独的代理签署公钥的有效性。我们进一步提出了一种实用的阈值代理签名方案来弥补这一缺陷。新方案具有以下优点:(1)任何验证者都可以通过原始签名者检查代理签名的作者是否属于指定的代理组,而外部者则无法找到实际的签名者; (2)原始签名人可以识别实际的代理签名人; (3)可以在签名验证过程中同时完成对代理签名者的代理签名公钥和阈值代理签名的验证。

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