Research And Application On Certificateless Cryptographic Schemes

With the rapid development of the Internet,information networks have brought great convenience to people,but they still face a series of security challenges,such as data replay,forgery,and tampering.As the core technology of cryptography,certificateless cryptosystems can overcome the management problems and key escrow problems,digital signature technology can ensure the integrity and non-repudiation of digital messages.However,with the emergence of new technologies such as big data and Internet of Vehicles,the traditional certificateless cryptographic scheme cannot meet the security requirements of the new environment.Therefore,we have designed some message authentication schemes based on certificateless aggregate signature and certificateless aggregate signcryption.The specific description is as follows:(1)To solve the problem that the certificateless signcryption scheme proposed by Zhou et al.cannot satisfy the unforgeability problem,a specific attack process is given.The adversary in this scheme can pretend to be a legitimate user to forge the legal signature of any message and successfully sends it to the recipient,but the recipient does not know the authenticity of the message in the scheme.(2)To solve the problems of identity privacy leakage and excessive message authentication overhead in VANETs,a message authentication scheme based on certificateless aggregate signature is proposed.The scheme solves the problems of certificate management and key escrow,and uses "batch processing" and "compression" technologies to improve signature verification and transmission efficiency.In addition,the pseudonym generation mechanism by the roadside unit realizes conditional protection of identity privacy.The analysis results show that the scheme achieves the authentication,integrity and identity privacy protection of vehicle units.(3)To solve the problems of data privacy protection and authenticity verification of data sources in VANETs,a message authentication scheme based on certificateless aggregate signcryption is proposed.The scheme uses aggregate signcryption technology to realize the confidentiality of messages and ensure the security of data transmission.The analysis results show that the scheme greatly reduces the calculation overhead and communication bandwidth of verification in the signcryption and designcryption phases,and realizes the real-time performance of communication messages and the rapid verification of signatures,which is very suitable for the Internet of Vehicles environment.