关键词: 车载自组网, 信任管理, 声誉, 隐私保护, 假名

Abstract: The trust management systems in Vehicular Ad-hoc Networks（VANETs） require users to disclose their reputation-related information, which will bring dangers to user privacy. To deal with the collusion between trust and privacy, a novel “pseudonym-reputation” collaborative change scheme is presented in this paper. This scheme is based on the k-anonymity theory and user-centric strategy. The personalized privacy protection is considered and a PK-PCS strategy is presented. Experiments show that the PK-PCS strategy is better than the traditional Pseudonym Change Strategy（PCS） strategy and K-anonymity Pseudonym Change Strategy（K-PCS） strategy in privacy preservation, satisfaction and data loss. The PK-PCS not only maintains the usefulness of trust, but also protects the privacy of users.

Key words: Vehicular Ad-hoc Network（VANET）, trust management, reputation, privacy preservation, pseudonym