With the proliferation of web technologies, many social networks are increasingly present on the Internet. The majority of these networks do not offer any real guarantees on the respect of user privacy (that is, they collect identity data from consumers). This thesis work is part of the family of so-called "anonymous" networks where the anonymity of users is fully respected (no collection of information related to their identities). So the goal of this thesis is to know how to build trust within such an anonymous network to promote mutual aid, exchange and sharing, and how to prevent its use for dishonest purposes.
