Abstract: In the ID-based crypto system，user’ public key is decided by his ID which is not distributed by CA.This way has solved the problem of public key’s storage and management.In a threshold proxy signature，the power of signature is distributed to a signature group which can prevent the abuse of the power.This article introduces an ID-based threshold signature scheme which uses bilinear parings.In addition，an analysis is given about the relevant security of this scheme.And this scheme can also withstand the conspiracy attack.

摘要： 在基于身份的密码体制中，用户的公钥由用户的身份信息决定，不需要CA颁发公钥证书，解决了公钥存储和管理问题。门限代理签名因其可以将签名权利分散于一个签名团体，可以有效防止代理签名权的滥用而受到广泛关注。基于双线性映射对构造了一个基于身份的门限代理签名方案，分析了方案的可区分性、可验证性、强不可伪造性、强可识别性、强不可否认性等安全特性，并指出该方案可以很好地抵抗合谋攻击。