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However, there are growing concerns about the misuse of location data by third-parties, which fuels the need for more privacy controls in such services. Location-Sharing-Based Services (LSBS) complement Location-Based Services by using locations from a group of users, and not just individuals, to provide some contextualized service based on the locations in the group. The two example SPATE applications provide increased security with no overhead noticeable to users once keys are established. Our implementation of SPATE on Nokia N70 smartphones allows users to establish trust in small groups of up to eight users in less than one minute.

For this work, we leverage SPATE as part of a larger system to facilitate efficient, secure, and user-friendly collaboration via email and file-sharing services. Once the SPATE protocol runs to completion, its participants’ mobile devices have authentic data that their applications can use to interact securely (i.e., the probability of a successful attack is 2^−24). This work presents SPATE, a primitive that allows users to establish trust via device mobility and physical interaction. Prior works assume trusted infrastructure, require an individual to trust unknown entities, or provide relatively low probabilistic guarantees of authenticity (95% for realistic settings). Establishing trust between a group of individuals remains a difficult problem.

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