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With an increasing number of wireless devices and access technologies available, users will be able to access their personal distributed environment of services and data conveniently in a wide variety of ways. Unfortunately this flexibility comes at a cost - higher security risks and vulnerabilities. The traditional association with a network provider may not exist, replaced by a far more nebulous association with a number of unknown entities, network nodes and service providers. These ad hoc relationships require a notion of trust, which presents great difficulties in a dynamic wireless environment. This paper presents a formal trust architecture to address these issues, with the focus on aspects of trust policy formation and its evolution.