In this chapter, the authors propose an approach with a unified framework for trust management with a consistent way to cover a broad variety of trust mechanisms including credentials, reputation, local data storage, and environment parameters. The trust request, trust evaluation, and trust consuming are handled in a comprehensive manner. The framework has a high extensibility to embrace established standards and new requirements. With the help of the proposed framework, the development of a trust management system in the real world can be automated to a substantially high level