摘要： 为解决5G网络下的用户身份信息泄露及隐私保护问题，提出一种无证书身份隐藏签密方案。运用密码学哈希函数将签密者的身份信息与其公钥进行绑定并生成用户部分私钥，以防止用户公钥替换攻击。在解签密阶段，输入信息中不包含签密者的身份信息，而是将其作为输出信息进行验证，从而实现签密者身份信息的隐藏。实验结果表明，在随机预言模型下，该方案的安全性规约于计算判定性Diffie-Hellman问题，且具有较高的通信效率与较低的计算开销。

关键词: 5G网络, 无证书密码体制, 身份隐藏, 签密, 判定性Diffie-Hellman

Abstract: To solve the problem of user identity information leakage and privacy protection under 5G network,this paper proposes a signcryption scheme for certificateless identity hiding.The scheme uses cryptographic hash functions to bound the identity information of the signer to the public key,and generates a part of the private key of the user to prevent public key substitution attacks.In signature decryption,the signer identity is not included in the input information,but is output for verification,so the signcryption process is anonymous.Experimental results show that in the random prediction model,the security of the proposed scheme can be reduced to the calculation of the Decisional Diffie-Hellman(DDH) problem,and the scheme has a high communication efficiency and low computation cost.

Key words: 5G network, certificateless cryptosystem, identity hiding, signcryption, Decisional Diffie-Hellman(DDH)

中图分类号: 

• TP391