摘要： 在门限数字签名的生成过程中，每个签名者的作用均等，一旦签名产生纠纷，责任便不明确。为解决上述问题，提出一个有指定责任者的门限数字签名方案。在该方案的门限签名生成阶段，有且只有一个签名者作为主要责任人，并由他发起该次签名，使事后的纠纷有明确的负责人。该方案还能防止签名责任者在门限签名的产生阶段实施替换消息攻击及伪造攻击，不需要额外的签名合成者和安全信道。

关键词: 数字签名, 门限签名, 单向哈希函数, 合谋攻击, Schnorr方案

Abstract: In the stage of threshold digital signature generation, each signer’s work is equality. So there is not a defined person in charge, when the signature arouses dissension. This paper proposes a new threshold signature scheme that overcomes the above weakness. There is one and only one signer in charge of the signature, who mobilizes the threshold signature in the origination stage. The signer should response for the possible dissension. The scheme can prevent a dishonest of signing group from changing the signing massage to another of his choice while he is cooperating with other signers to produce a threshold signature.

Key words: digital signature, threshold signature, one-way hash function, conspiracy attack, Schnorr scheme

中图分类号: 

• TP309