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The Opportunistic Communication main goal is to use short-term, simple, easy, convenient, and quick actions to communicate when limited or no traditional Communications infrastructure is available. For users’ altruism represents the heart of any OppNets, using Communications Technologies such as Bluetooth, Wi-Max, or Wi-Fi to communicate poses not only routing challenges but also users privacy challenges. However, most researches on OppNets domain, focus more on routing security than users mutual authentication and privacy. This work provides a review of the state of the art proposals on users privacy and mutual authentication techniques with three main contributions. First, it clarifies the concept of Opp-Nets. Second, it Points out the differences between Opp-Nets and some communications models that emerged from Mobile Ad hoc Networks research. Third, it succinctly reviews the main existing techniques proposed for users mutual authentication and privacy protection in OppNets, organising them in a taxonomy. Finally, it discusses, the limits of the techniques studied.