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.