Cloud computing continues to provide flexible and efficient way for delivery of services, meeting user requirements and challenges of the time. Software, Infrastructures, and Platforms are provided as services in cloud and fog computing in a cost-effective manner. Migration towards fog instigate new aspects of research for security & privacy. Trust is dependent on measures taken for availability, security, and privacy of users’ services as well as data in fog as well as sharing of these statistics with stakeholders. Any type of lapses in measures for security & privacy shatter user’s trust. In order to provide a trust worthy security and privacy system, we have conducted a thorough survey of existing techniques. A generic model for trustworthiness is proposed in this paper. This model yields a comprehensive component-based architecture of a trust management system to aid fog service providers to preserve users’ Trust in a fog computing environment.