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Opportunistic Networks, with users as a vital component, appears as a natural evolution of mobile Ad Hoc Networks field, and to some extent, an example of how the Internet of Things work. So, Opportunistic Networks due to their characteristics, need users- centric considerations when it comes to design Opportunistic Networks' routing, privacy, and authentications schemes. However, most mutual authentication schemes proposed for Opportunistic Networks do not consider, on the one hand, the gregarious aspect of users, and on the other hand, the parameter that pre-established contacts could be used in a mutual authentication process. Considering the factors pre-established contacts, Seed OppNet Identity, and traditional cryptography's principles, this paper proposes a realistic multiple levels authentication scheme for short-term and limited-time wireless network environment. The proposed scheme is realistic …