OpenID is a standard decentralized initiative aimed at allowing Internet users to use the same personal account to access different services. Since it does not rely on any central authority, it is hard for such users or other entities to validate the trust level of each other. Some research has been conducted to handle this issue, defining reputation framework to determine the trust level of a service based on past experiences. Deep analysis and validation need to be achieved in order to prove the feasibility of this framework. Our main contribution in this paper consists of a simulation environment able to validate the feasibility of that reputation framework and to analyze its behavior within different scenarios.