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To share services, mobile devices may need to locate reputable in-range providers and, to do so,
they may exchange ratings with each other. However, providers may well tweak ratings to their own advantage.
That is why we have designed a new decentralized mechanism (dubbed MobiRate) with which mobile devices
store ratings in (local) tamper-evident tables and check the integrity of those tables through a gossiping protocol.
We evaluate the extent to which MobiRate reduces the impact of tampered ratings and consequently locates
reputable service providers. We do so using real mobility and social network data. We also assess computational
and communication costs of MobiRate on mobile phones.