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签密高效地解决了在一个逻辑步骤内不能同时完成对消息签名和加密的问题.无证书混合签密方案解决了传统公钥密码体制的证书管理问题和消息长度受限问题、基于身份密码体制的密钥托管问题.本文提出一个新的无证书混合签密方案.方案利用双线性对,将无证书签密和混合加密相结合,并在随机预言机模型中利用双线性Diffie-Hellman假设证明了方案的机密性,利用计算性Diffie-Hellman假设证明了方案的不可伪造性.方案还满足可公开验证性和前向安全性,与同类方案相比具有更高的安全性;在密文长度相当的情况下,运算量更小,效率更高.
Signcryption effectively solves the problem of not being able to sign and encrypt messages at the same time in a logical step.The certificateless hybrid signcryption solution solves the problem of certificate management and message length limitation of the traditional public-key cryptosystem. Based on the identity-password system Key escrow problem.This paper proposes a new certificateless hybrid signcryption scheme.By using bilinear pairings, the scheme combines certificateless signcryption and hybrid encryption, and uses the bilinear Diffie-Hellman Hypotheses prove the confidentiality of the scheme, and use the computational Diffie-Hellman hypothesis to prove the scheme’s unforgeability. The scheme also satisfies the open verifiability and the forward security and has higher security compared with the similar scheme. With the same length of text, the computation is smaller and the efficiency is higher.