SybilGuard: defending against sybil attacks via social networks
In SIGCOMM '06: Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications (2006), pp. 267-278.
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The verification process is based on random routes. "The verifier only accepts the suspect if their random routes intercepts". Along the routes, all nodes store some information that allows to reconstruct partially the routes.
The idea is that nodes belonging to a sybil group are mostly connected among themselves so their routes will not intersect so frequently with the verifier.
Routes are fixed at each node, meaning that if a route enters a node A from node B, then the route will exit node A to node p(A) independently of B [the routing table at each node is a permutation of its neighbors].
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