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目前,大多数基于无证书的加密方案和签名方案的构造方法都忽视了恶意私钥中心的攻击,如何设计一个有效的可抵抗恶意私钥中心的无证书密码系统是研究热点.通过对原始的无证书加密方案顺序的改变,利用双线性映射构造了一个高效的可以抵抗恶意私钥中心的无证书加密方案.在方案中,加密过程只需一次幂运算,解密过程仅需一个对运算.与已有的方案相比具有很高的效率.方案安全性基于计算Diffie-Hellman问题和P-双线性Diffie-Hellman Inversion问题,并在随机预言模型下对用该方法所构造的方案的安全性进行了证明.
At present, most of the methods based on certificateless encryption schemes and signature schemes ignore the attacks of malicious private key centers, and how to design an effective certificateless cryptosystem that can resist malicious private key centers is a research hotspot. In the scheme, the encryption process only needs a power exponentiation, and the decryption process only needs one pair of operations. Compared with the existing schemes, the scheme has high efficiency.Scheme Security Based on the calculation of Diffie-Hellman problem and P-bilinear Diffie-Hellman Inversion problem, and the security of the scheme constructed by this method under the random oracle model Sex has been proved.