Abstract: A new ID-based signature scheme from bilinear pairings is proposed in this paper.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，the paper imports more TA，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 then it can be used in a public situation finally.

Key words: identity-based, trusted-authority, bilinear map, Weil pairing

摘要： 分析了现有的基于身份的签名方案，发现在这些方案中签名者都必须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可以伪造签名者的签名。基于此，引入多个TA，提出了一种新的基于身份的签名方案，并对该方案进行定性分析。在本方案中，如果能确保至少一个TA是诚实可信的，那么就可以确保本方案的安全性，使得本方案可以应用于公开环境中。

关键词: 基于身份, 可信中心机构, 双线性映射, Weil配对