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The evolution of mobile devices with various capabilities (e.g., smartphonesand tablets), together with their ability to collaborate in impromptu ad hocnetworks, opens new opportunities for the design of innovative distributedapplications. The development of these applications needs to address severaldifficulties, such as the unreliability of the network, the imprecise set ofparticipants, or the presence of malicious nodes. In this paper we describe amiddleware, called SITAN, that offers a number of communication, groupmembership and coordination services specially conceived for these settings.These services are implemented by a stack of Byzantine fault-tolerantprotocols, enabling applications that are built on top of them to operatecorrectly despite the uncertainty of the environment. The protocol stack wasimplemented in Android and NS-3, which allowed the experimentation inrepresentative scenarios. Overall, the results show that the protocols are ableto finish their execution within a small time window, which is acceptable forvarious kinds of applications.

SITAN: Services for Fault-Tolerant Ad Hoc Networks with Unknown Participants