Blockchain-Based Signature Scheme with Cryptographic Reverse Firewalls for IoV

In recent years, research on Internet of Vehicles (IoV) has received widespread attention. However, widespread adoption of this technology faces various obstacles, such as data forgery. Ensuring authenticity of IoV data is crucial as malicious adversaries can manipulate or forge information, leading to security issues. Consequently, data transmission in IoV requires robust signatures. Identity-based signature (IBS) schemes have been proposed as an effective solution. However, traditional IBS schemes are unable to detect internal attackers, which may result in data leakage. To overcome this limitation, we append cryptographic reverse firewall (CRF) on this basis to design a secure and practicable IBS-CRF scheme which has the advantage of computational and communication cost. It is also proved to achieve existential unforgeability against chosen-message attacks (EUF-CMA) and resist internal attackers. Moreover, to further enhance security, a consortium blockchain is introduced, enabling organizations to establish consensus mechanisms and collectively manage and approve transactions. Eventually, we use pypbc library to implement it. The experimental results indicate that this scheme has the least running time. In a word, our blockchain-based IBS-CRF (BIBS-CRF) scheme is suitable for IoV environment.