Certificate and Signature Free Anonymity for V2V Communications

Anonymity is a desirable feature for vehicle-to-vehicle (V2V) communications, but it conflicts with other requirements such as non-repudiation and revocation. Existing, pseudonym-based V2V communications schemes rely on certificate generation and signature verification. These schemes require cumbersome key management, frequent updating of certificate chains and other costly procedures such as cryptographic pairings. In this paper, we present novel V2V communications schemes, that provide authentication, authorization, anonymity, non-repudiation, replay protection, pseudonym revocation, and forward secrecy without relying on traditional certificate generation and signature verification. Security and privacy of our schemes rely on hard problems in number theory. Furthermore, our schemes guarantee security and privacy in the presence of subsets of colluding malicious parties, provided that the cardinality of such sets is below a fixed threshold.