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中文摘要：
代理签名计划允许一位原来的签名人托付他的签名权利到一位代理签名人。然而，许多代理签名计划有是无能解决代理撤回问题的缺点。在这篇文章，我们第一建议一个基于身份的阀值签名计划并且证明它有 unforgeability 和坚韧性的性质。在我们的阀值签名计划，我们采用如此的一个方法，与身份联系的私人钥匙而非主人钥匙被分享。基于阀值签名计划，在一个安全调停人( SEM )被介绍帮助一位代理签名人产生有效代理签名的地方，然后，一个基于身份的调停的代理签名计划被建议，检验一位代理签名人是否根据保证签名，并且检查一位代理签名人的撤回。建议计划满足安全代理签名的所有安全要求，这被显示出。而且，一位代理签名人必须与 SEM 合作产生有效代理签名，它让新计划有有效、快的代理撤回。
英文摘要：
Proxy signature schemes allow an original signer to delegate his signing rights to a proxy signer. However, many proxy signature schemes have the defect which is the inability to solve the proxy revocation problem. In this article, we firstly propose an identity-based threshold signature scheme and show that it has the properties of unforgeability and robustness. In our threshold signature scheme, we adopt such a method that the private key associated with an identity rather than the master key is shared. Then, based on the threshold signature scheme, an identity-based mediated proxy signature scheme is proposed where a security mediator （SEM） is introduced to help a proxy signer to generate valid proxy signatures, examine whether a proxy signer signs according to the warrant, and check the revocation of a proxy signer. It is shown that the proposed scheme satisfies all the security requirements of a secure proxy signature. Moreover, a proxy signer must cooperate with the SEM to generate a valid proxy signature, which makes the new scheme have an effective and fast proxy revocation.
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