Dynamic open environments demand trust negotiation sys tems for unknown entities willing to communicate. A security context has to be negotiated gradually in a fair peer to peer basis depending on the security level demanded by the application. Trust negotiation engines are driven by decision engines that lack of exibility: depend on the im plementation, policies languages or credentials types to be used. In this paper we present an agnostic engine able to combine all that information despite its origin or language allowing to select policies or requirements, credentials and resources to disclose, according to user preferences and context using iterative weighted Multidimensional Scaling to assist a mo bile device during a trust negotiation. Full Text at Springer, may require registration or fee