高效无证书混合签密

Efficient Certificateless Hybrid Signcryption

无证书混合签密能够处理无证书体制下任意长度的消息,而普通的无证书签密则不能处理.指出Selvi等人提出的攻击是不成立的,并构造了一个新的无证书混合签密方案.与现有方案相比,该方案具有密文长度短、计算速度快的优点,因此更适用于带宽窄、计算资源少的通信环境,如ad hoc网络.在随机预言模型和双线性Diffie-Hellman困难性假设条件下,该方案可证明是安全的.

Certificateless hybrid signcryption can handle messages of arbitrary length while the conventional certificateless signcryption cannot. This paper demonstrates that the attacks presented by Selvi, et al., do not hold, and proposes a new certificateless hybrid signcryption scheme, which outperforms all the existing schemes on both bandwidth usage and computation efficiency. Hence, this scheme is more suitable for the applications with a narrow bandwidth and limited computation resources such as ad hoc networks. This scheme has been proven to be secure in the random oracle model, under the bilinear Diffie-Hellman assumption.