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There has been a spurt of works showing that the existence of sybil attacks is a serious threat to Peer-to-Peer networks, where one or more attackers can forge a large number of fictitious identities. In this paper, we present a distributed protocol to reduce the adverse effects of sybil attacks in free riding problem. Our approach focuses on restricting nodes to obtain the number of service units...
Present indirect contribution transaction protocols are vulnerable to sybil attacks where one or more attackers can forge a large number of fictitious nodes. In this paper, we propose a decentralized sybil-resilient contribution transaction protocol. It allows nodes to obtain service for use from remote nodes, while restricting the amount of service which sybil nodes receive from honest nodes even...
It is quite difficult to provide a secure routing path in DHTs, since nodes in the routing path do not always behave according to pre-established routing protocols. To address this issue, we propose a secure protocol which consists of two phases: detecting malicious nodes and bypassing them. We present a novel efficient routing strategy called tracer routing to control routing progress, accompanied...
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