摘要： 利用椭圆曲线上双线性映射的特性,提出了一种有效的基于身份的签密方案,签密可以同时完成数字签名和公钥加密两项功能,其代价显著低于常规“先签名再加密”方法的代价。而且在椭圆曲线群中构造的基于身份的新方案比一般的签名方案具有更高的安全性。此方案具有有向性,只有特定的接收方可以由签名恢复被签消息,验证签名的有效性。

关键词: 基于身份的密码体制, 消息可恢复签名, 双线性映射, 签密方案

Abstract: A new efficient ID-based signcryption scheme is proposed, in which some characteristics of bilinear map are used. Signcryption can sign and encrypt message at the same time, and has lower costs than that of “firstly sign and then encrypt”. The new ID-based scheme that is constructed in ellipse group is secure than the general scheme. In the new scheme the signed message can be reverted only by appointed receiver because of its orientability.

中图分类号: 

• TP309