Abstract: A new ID-based proxy signature scheme from bilinear pairings is proposed.It is found that these existing ID-based signature schemes need to trust a Trusted-Authority（TA） unconditionally.The key of the signature is generated from TA，and TA can forge a signature successfully.Because of this，this paper imports more TA to solve the “forge signature” problem，and proposes a new ID-based signature scheme and carries on qualitative analysis to this scheme.In this scheme，if it can insure at least one TA is honest，the security of this scheme can be assured and then it can be used in a public situation finally.

摘要： 通过对现有的基于身份的签名方案进行分析，发现在这些方案中签名者都必需绝对信任可信中心机构（TA）。由于签名者用于签名的密钥是由TA生成的，TA可以伪造任何签名者的签名。基于此，引入多个TA，解决了TA伪造攻击问题，提出了一种新的基于身份的代理签名方案，并对该方案进行了定性分析。在方案中，如果能确保至少一个TA是诚实可信的，那么就可以确保方案的安全性，使得方案可以应用于公开环境中。