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Ubiquitous computing connects computers, places, people and everyday objects together by providing the support for social interactions in our everyday computing environment. Such interactions are usually impersonal, interpersonal and hyperpersonal, which are identified as the communications and the collaborations between entities. Since trust ensures the confidence in interactions between entities in social situations, it is critical to validate whether the use of any trust mechanism is adequate in any given environment, e.g., pervasive advertising. This paper presents a novel evaluation framework for trust-based access control (TBAC) models. The proposed framework is designed to compare several TBAC models by simulating a number of well known security attacks including the Sybil attack.