标准模型下可证安全的一种新的CL-PKE加密方案

New Provable Security CL-PKE Encryption Scheme in the Standard Model

摘要: 该文在标准模型下构建了一个实用的无证书公钥加密体制(CL-PKE)，相比于其他的CL-PKE加密体制，该体制在加密时没有椭圆曲线上的对运算，而且所基于的难解性问题假设是自然的双线性Diffie-Hellman(BDHP)问题。为提高安全性，该文的安全模型选用了标准模型下的选择性身份(Selective-ID)模型，在提高效率的同时也增强了安全性。

Abstract: A certificateless public key encryption (CL-PKE) algorithm is presented. The proposed CL-PKE algorithm is based on the nature BDHP difficulty assumption and therefore avoids paring computation on elliptic curves, which is the most expensive operation in the encryption algorithm. In CL-PKE algorithm, the selective-ID model is applied instead of the random oracle model. The security and efficiency of the algorithm can be improved compared with some other CL-PKE schemes.