Bilateral Control for Secure Communication against Replay Attack in ORAN-based Vehicular Networks

Open radio access network (ORAN)-based vehicular networks play a pivotal role in future traffic data sharing. Due to the openness of the ORAN framework, it is necessary to encrypt the sharing data to prevent unauthorized access or misuse by malicious participants. However, current efforts struggle to address some emerging security requirements, such as the bilateral control of sending and access rights in cellular vehicle-to-everything (C-V2X) communications, as well as evolving replay attack on encrypted data. With these challenges, this paper presents a fine-grained access control encryption (FGACE) scheme for secure communication in ORAN-based vehicular networks. Our FGACE enables fine-grained and bilateral control over senders and receivers. We design a novel sanitization algorithm against dishonest sanitizer and replay attack. Furthermore, we deeply explore security models for replay attack on encrypted data to support secure sanitization, i.e., attribute-based replayable CCA security and related definitions. We prove that our FGACE satisfies the proposed security definitions. Feature comparison demonstrates that our scheme does better in security and privacy. Experimental results show that our scheme outperforms compared schemes. When the number of attributes increases to 50, our total computational overhead is lowest, and the total storage overhead is approximately less than 1/3 of other schemes. The impressive performance indicates that our FGACE is practical in ORAN-based vehicular networks.