Cooperative anonymity authentication in Vehicular Networks

Data privacy in vehicular ad hoc networks (VANETs) is a practical issue currently under investigation. Privacy-preserving anonymity authentication in networks is a challenging topic related to security, anonymity, network, and data privacy. Existing anonymity authentication in VANET is based on a k-anonymity model. An on board unit (OBU) chooses an adaptive anonymity group size in a request to an road site unit (RSU). Upon response from an RSU, an OBU verifies the RSU's work probabilistically. But k-anonymity model group selection may leak information due to absence of diversity in the sensitive attribute, and an RSU lacks a rational strategy to adapt to an OBU's adaptive and probabilistic strategies. In this paper, we address anonymity authentication cooperative issues. Specifically, an RSU uses cryptographic client PUZZLE (CCPUZZLE) to enforce its maximum anonymity group's recommendation, and countermeasure denial-of-service (DoS) attacks. Cooperative design also relaxes restraints and supports anonymity group formation accommodating various anonymity models. In this paper, we clearly demonstrate that CCPUZZLE brings an OBU's cooperation and also efficiently countermeasures DoS attacks.