Adaptive and Optimum Secret Key Establishment for Secure Vehicular Communications

In intelligent transportation systems (ITS), communications between vehicles, i.e. vehicle-to-vehicle (V2V) are of greatest importance to facilitate autonomous driving. The current state-of-the-art for secure data exchange in V2V relies on public-key cryptography (PKC) consuming significant computational and energy resources the encryption/decryption process large bandwidth key distribution. To overcome these limitations, physical-layer security (PLS) has emerged as a lightweight solution by exploiting physical characteristics communication channel generate symmetric cryptographic keys. Currently, key-generation algorithms designed via empirical parameter settings, without resulting optimum performance. this paper, we devise algorithm PLS introducing novel response quantisation method that results performance analytical settings. Contrary state-of-the-art, responses incorporate all attributes contribute temporal variability, such three dimensional (3D) scattering scatterers’ mobility. An extra functionality, namely, Perturbe-Observe (PO), is further incorporated enables adapt inherent non-reciprocity at legitimate entities. Optimum evidenced maximisation bit generation rate (BGR) entropy (H) minimisation mismatch (BMR). A new metric introduced, so-called secret-bit (SBGR), ratio number bits which successfully used compose keys total amount samples. SBGR unifies BGR BMR thus maximised proposed algorithmic process.