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In a future vision of Ambient Intelligence–or AmI–our surrounding environment will integrate a pervasive and interconnected network of devices equipped with sensors, actuators and ambient agents. However, it is a big security issue when building this kind of complex systems, and it is not enough that ambient agent platform provides a set of standard security mechanisms such as sandboxing, encryption and digital signatures. Furthermore, we must take into account ambient agent limitations and we mustn’t endow it with complex cryptography concepts or historic data. This is why our approach, proposed in this paper, is based on cooperation between group members and behavior inspection of new integrated agents, in addition of some cryptography concepts. The proposed protocol is based on cooperation, collective decision, guarantee and attribution of privileges according to the trust degree of agents.