Research On Data Privacy Protection Based On Certificateless Signcryption

With the development of Internet technology,network information and digitization have brought convenience to people's lives.At the same time,it has also brought about related network security problems.Among them,the leakage of user privacy in the process of network transmission is one of the problems that needs to be solved.In cryptography,signcryption technology can encrypt and sign messages within one logical step,reduce computational complexity,increase communication efficiency,reduce communication overhead,and can be widely used in resource-constrained network environments.The certificateless cryptosystem overcomes the cumbersome certificate management problems in traditional public key cryptosystems,and also solves key escrow problems in identity-based cryptosystems.Therefore,certificateless signcryption has become a hotspot in cryptography research in recent years.This article focuses on the study of certificateless signcryption.The specific research content as follows:(1)A secure and efficient certificateless signcryption scheme was constructed.In order to solve the problem that the user's public key is replaced,a certificateless signcryption scheme based on bilinear pairing is proposed.Through the key encapsulation technology,the signcryption operation can be performed on messages of any length.The new scheme reduces the number of bilinear pairing operations and it is more efficient.In the random oracle model,based on the bilinear Diffie-Hellman(BDH)difficulty problem and computational Diffie-Hellman(CDH)difficulty problem,this scheme is proved that it satisfies confidentiality and unforgcability.(2)A certificateless aggregate signcryption scheme for smart grid was constructed.In smart grid,research on privacy protection based on masked random number and certificateless aggregate signcryption.The scheme uses a random masking technique to mask the user's actual power consumption data.The scheme uses the signcryption technology to prevent user privacy leakage and uses aggregation technology to solve the communication congestion caused by dada aggregation.In the random oracle model,based on the bilinear Diffie-Hellman(BDH)difficulty problem and computational Diffie-Hellman(CDH)difficulty problem,it is proved that the scheme satisfies the confidentiality of the message and the unforgeability of the signature.By analyzing the performance of the scheme and comparing other schemes,the scheme is more efficient and more suitable for devices with limited computing power and storage capacity such as smart grid.