标准模型下的无证书签密方案

目前大多数基于身份的数字签名方案的安全性是基于随机预言模型进行证明的，但是许多方案都存在安全性问题。提出一种安全、高效的基于身份的无证书签密方案，并且在标准模型下证明该方案是安全的，方案的安全性可规约为q-ABDHE困难问题。与现有的标准模型下安全的基于身份的无证书签密方案相比，方案的通信代价更小，执行效率更高。

Certificateless signcryption scheme in standard model

Most of the current identity-based signature schemes are secure in the random oracle model, but many of them have security problem. In this paper, an efficient and provably secure identity-based certificateless signcryption scheme was proposed. The scheme was proved secue in the standard model and reduced the q-Augmented Bilinear Diffie-Hellman Exponent (q-ABDHE) problem. Compared with the known identity-based scheme in the standard model, the proposed scheme has shorter signature length and less operation.