指定接收者恢复消息的抗抵赖数字签名体制

抗抵赖的签密方案在一些应用中有重要的价值.已有的方案如认证加密方案和签密方案在解决签名者事后抵赖的问题时,必须把恢复的消息提供给第三方,从消息的保密方面看,效果并不理想.基于离散对数问题提出了安全有效的指定接收者恢复消息的抗抵赖数字签名体制,其特点是只有指定接收者才可以恢复消息,任何人可以验证签名的合法性,在解决签名者事后抵赖的问题中克服了已有方案的缺陷,不需要签名者的合作、不需要向第三方提供恢复的消息、不需要与第三方执行交互的零知识证明,在保持恢复消息秘密的同时能揭穿签名者的抵赖行为.同时把该方案扩充到了指定的一群接收者恢复消息的抗抵赖的多重签名的情形.

Non-repudiation signature with message recovery for specified recipient

In some applications, it is necessary that the signature only needs to be verified and the message only needs to be recovered by some specified recipients while keeping the message secret from the public, and the signer can not repudiate the signature. Non-repudiation signature scheme with message recovery for specified recipient based on discrete logarithm is proposed. It has many efficiency features, only the recipient can recover the message, and any one can verify the signature. In order to solve the repudiation of the signer, compared with the previous schemes, the proposed scheme does not need to present the recovered message to the third party, to cooperate with the signer, or to perform a zero-knowledge protocol. Moreover, it can extend to non-repudiation multisignature scheme with message recovery for specified group of recipients.