With the rapid advance of network technologies, several studies have addressed security and privacy issues in vehicular ad hoc networks (VANET). Most of them focused on safety applications. In fact, developing a value-added service via VANET is another issue worth researching. Thus, determining how to provide a public transport passenger with various services while protecting the passenger’s anonymity has become a more important issue. In this thesis, we propose a smart card-based multimedia on demand (MoD) payment system in public transportation that not only protects the passenger’s anonymity but also uses a personal trusted device to protect the passenger’s sensitive information so that the passenger can enjoy the multimedia data during the long hours of travel. In the future, our scheme can be applied to actual practice, thereby enhancing the competitiveness of public transport companies.