摘要： 随着移动代理的发展，相关的安全问题也日益受到关注。保护移动代理免受代理平台的攻击是一个非常关键和有挑战性的工作。该文讨论了如何才能使一个移动代理可以在一个恶意的代理平台下代替移动代理的拥有者进行签名且不暴露拥有者的密钥信息。提出了一个新的高效的签名方案。新方案不仅签名过程的时空效率可以比已有方案提高几倍，而且在随机预言模型下被证明是安全的。

关键词: 数字签名；移动代理；一次代理签名

Abstract: With the development of the mobile agent, the security problems related to it are receiving an increasing attention. How to protect the mobile agent from the malicious agent platforms is an important nevertheless tough task. This paper argues the problem of how a mobile agent can sign a signature on behalf of its owner in a hostile environment without revealing its owner’s secret key. A new digital signature scheme is proposed here with improved efficiency in time and space cost. What’s more, the new scheme is provably secure in the Random Oracle Model.

Key words: Digital signature; Mobile agent; One-time proxy signature