Research On Certificateless Aggregate Signature Scheme And Its Applications

the development of wireless communication technol With ogy,many electronic data begin to be transmitted through public networks.Because of the open nature of public networks,it is increasingly important to ensure privacy and data security.At the same time,computing power,storage capacity and bandwidth requirements have become the main constraints for the development of many applications.Certificateless public key cryptosystem does not have the problems of certificate management and key escrow.Therefore,it has obvious advantages in terms of storage space and communication cost.Aggregation signature technology can aggregate n signatures into one signature,and the verifier can confirm the validity of the n signatures only by verifying the aggregated signature information,thus significantly reducing the computational and communication overhead.Certificateless aggregate signature combines the advantages of certificateless public key cryptosystem and aggregate signature,and is suitable for solving the security and privacy problems of resource-constrained networks,which attracts the attention of scholars.However,it is still a challenging task to design a secure and efficient certificateless aggregate signature scheme.Based on the above situation,this paper designs three certificateless aggregate signature schemes.The main contents of this paper are as follows:(1)A certificateless aggregate signcryption scheme based on elliptic curve is proposed,which uses strong RSA assumption to ensure its forward security.Secondly,its security is proved under the random prediction model.Finally,the efficiency and performance of the scheme are compared and analyzed,and the results show that the scheme has higher computational efficiency and better performance.(2)A certificateless aggregate signature scheme suitable for VANET is proposed.At the same time,aiming at the attacks of two kinds of adversaries,it is proved that the scheme is unforgeable under the attack of adaptive selection messages under the random prediction model.Finally,the calculation and communication efficiency are compared and analyzed,and the results show that the calculation and communication cost of the scheme is low.(3)In this paper,a privacy protection scheme of vehicle-mounted network combining blockchain and certificateless aggregate signature is proposed.The scheme ensures that V2 I communication provides conditional privacy protection by using certificateless aggregate signature scheme.At the same time,the blockchain is used to realize the transparency of vehicle false identity revocation.In addition,the scheme provides security proof against different types of adversary attacks.Compared with the existing scheme,the calculation cost of this scheme is lower.