摘要： 代理签密使原始签密者可以将其签密权力委托给代理签密者，从而代表原始签密者签密指定的消息。该文应用双线性对提出一个基于身份的代理签密方案。理论分析表明，在BDH问题和DBDH问题是困难的假设下，该方案是安全的，与现有的典型方案相比，其具有更高的实现效率，更适合实际应用。

关键词: 代理签密, 基于身份的密码体制, 双线性对

Abstract: Proxy signcryption is useful when an original signcrypter needs to delegate his or her signcrypting capability to a proxy signcrypter, and the proxy signcrypter can signcrypt messages on behalf of the original signcrypter. This paper proposes an identity-based proxy signcryption scheme from bilinear pairings. Analysis shows that the scheme is secure, assuming that BDH problem and DBDH problem are hard. It satisfies all the security that a strong proxy signcryption scheme requires. Compared with other schemes, the scheme is proved more efficient and suitable for many applications.

Key words: proxy signcryption, ID-based cryptography, bilinear pairings

中图分类号: 

• TN918