中文摘要：

已有的代理签密方案存在签密不能被公开验证、代理权不能安全被撤销、原始签密人的私钥被泄漏等缺陷。分析了YHSW方案的安全性,并利用双线性对和哈希函数,提出了一个可撤销代理权的基于身份的多代理多签密方案。提出的方案满足安全代理签密的所有安全性要求。在提出的方案中引入了时间戳,原始签密群不需要第三方的帮助就能安全地撤销代理权。代理权撤销后,以前的代理签密的有效性仍能被公开验证。

英文摘要：

The previous proxy signcryption schemes have some drawbacks,such that the signcryption can＇t be verified publicly;the power of proxy can＇t be revocated safely;the private key of the original signer can be leaked out,and etc.In this paper,the security of the YHSW scheme is analyzed.The bilinear parings and Hash function are adopted to propose an id-based multiproxy multi-signcryption scheme with the property of proxy revocation.The proposed scheme can satisfy all security request of the secure proxy signcryption.In the proposed scheme,the time stamp is adopted.The group of original signers can revocate the power of proxy safely without the help of the third party.After the power of proxy being revocated,the validity of previous proxy signcryptions still can be verified publicly.