Abstract: In order to prevent the signing key from being compromised via network transformation and being compromised on malicious hosts while compositing services using mobile agents，this paper proposes an secure signature scheme using conic curves.In this scheme，mobile agents need not to carry the private key when they generate digital signatures on behalf of the original service.The security of this scheme relies on the difficulty in solving discrete logarithm problems on conic curves and the difficulty of integer factorization.

Key words: services composition, mobile agent, digital signature, conic curve

摘要： 为解决使用移动Agent进行服务复合时签名密钥可能在网络传输中或恶意主机上泄漏的安全问题，提出了一个使用圆锥曲线的安全签名方案，并对其正确性和安全性进行了分析和证明。该使用方案签名时不要求移动Agent携带签名密钥，其安全性依赖于圆锥曲线上离散对数问题的难解性和大数因子分解的困难性。

关键词: 复合服务, 移动Agent, 数字签名, 圆锥曲线