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Presented in this paper a preliminary proposal of a security framework for delivering security properties to Trust and Reputation management systems in decentralized networks. When TR metrics are used in this framework, nodes can be held responsible for their actions and identity spoofing is prevented. By protecting trust reply messages and/or the interaction with trust holding agents, false reporting or message alteration is not possible anymore. Therefore, the security backplane delivers a unified framework for TR metrics allowing easy secure deployment. We plan to evaluate our framework with different TR metrics using simulations with colluding malicious nodes. Furthermore, we will analyze in details how different views can impact the overall behavior of the network and the overhead imposed by our solution.