"PRIVANET：车载Ad-Hoc网络中高效的假名管理框架"

"PRIVANET: An Efficient Pseudonym Changing and Management Framework for Vehicular Ad-Hoc Networks" presents a comprehensive and effective solution to the challenge of protecting location privacy in Vehicular Ad-Hoc Networks (VANETs). Despite the adoption of pseudonym-based schemes by standardization bodies such as IEEE and ETSI, effective pseudonym changing and management remain unresolved issues. In this paper, PRIVANET is proposed as a hierarchical framework that views the geographic area of vehicles as a grid, with each unit containing one or more logical regions known as Vehicle Location Privacy Zones (VLPZs). These zones can be easily deployed on roadside infrastructure (RI) such as gas stations to facilitate secure pseudonym changes and management. The framework includes several key components: 1) effective pseudonym changing strategies based on VLPZs; 2) reputation-based mechanisms to incentivize selfish vehicles to enter VLPZs; 3) user-centric privacy models; 4) secure hybrid mechanisms for assigning pseudonym sets and Certificate Revocation Lists (CRLs); 5) a method for generating IP and MAC addresses from pseudonyms; 6) a random model to estimate the number of VLPZs required for a given cell; 7) a mathematical model to optimize the placement of VLPZs on RIs to reduce vehicle transportation costs over time. Extensive simulations using real maps and traffic flow measurements were conducted to evaluate and validate PRIVANET. Overall, PRIVANET offers a robust and efficient solution for managing pseudonyms in VANETs, addressing key challenges related to privacy and security. By providing a structured framework for pseudonym changing and management, as well as incorporating innovative mechanisms and models, PRIVANET contributes significantly to the advancement of secure communication in vehicular networks.