A New IBE Scheme Based on Conjugate Search Problem

With the rapid development of Internet of Vehicles (IoV) technology, its security problem is attracting more and more attention. In this paper, an identity-based encryption scheme based on the conjugate search problem is proposed for the Internet of vehicles. In the scheme, the identity ID of the vehicle is directly used as the public key during communication, and the additional facilities for maintaining the identity certificate are no longer necessary. The scheme is based on the matrix over groupring, which can improve the efficiency of operations, and the scheme reduces the storage space by introducing the circulant matrix. Finally, the security reduction of the scheme to the Conjugate Search Problem based Diffie-Hellman assumption (CSP-DDH) under the random oracle model is proved, and the scheme is semantically secure under the Chosen Plaintext Attack.