一种可公开验证的基于身份的签密方案

An identity-based signcryption scheme with public verifiability

签密作为一个新的密码学构件,能够在一个逻辑步骤内同时完成数字签名和公钥加密,减少了计算和通信开销。利用椭圆曲线的双线性对性质,提出了一种基于身份的签密方案,该方案提供了可由任意第三方认证密文,只有指定的接收者才能解密密文的功能,还满足了签密方案所要求的机密性、不可伪造性和不可否定性,经过分析比较,该方案具有很高的安全性和效率。

Signcryption is a new cryptographic primitive, which can sign and cncrypt message at the same time and reduce much communication and computation costs. A new efficient identity-based signcryption scheme was proposed, in which some characteristics of bilinear map were taken into account. In this scheme, anyone can identify the source of the ciphertext, but only the receiver can recover the plaintext. What＇s more, this scheme can satisfy the confidentiality, unforgeability and non.repudiation required by signcryption. This scheme is also very efficient regarding the computation costs and the communication overheads after analyzing and being compared with other schemes.