Essay On Sybil Attack

Literature review of various papers describes the different kinds of methodology for the identification of Sybil attack. The Sybil resilient protocol method is used by Xu Xiang in [17] for limiting the service unit consumed by a node. In this methodology explain that two different kind of contribution transfer: direct transfer and indirect transfer. In direct transfer there are two different kinds of contribution transfer: contribution and transaction. In direct transfer, contribution transfer takes place between two adjacent nodes. Without any precondition a node may provides several service units to other nodes. In indirect transfer there is only one transfer mode: transaction. In this contribution transfer takes place between two non-adjacent

These methods are shortly described in this paper as follow:
1. Trusted certification
The trusted certification approach, a centralized certificate authority can be maintained in the network [10]. This central certificate authority is to be free from Sybil identities. The certificate authority will verify the one is to one accommodation between an entity and its associate identity on the network. Thus the certificate authority overcomes the problem of trust relationship between two nodes [9].
2. Resource Testing
The resource testing method is to find out the whether the node have adequate resources or not. In resource testing check for the computation, storage and network bandwidth of a node [11]. The computing resource of each node is limited on the network. The Sybil attacker takes more resources to obtain the task.

3. Recurring costs
The Recurring costs are alteration of resource tests are done after specific time intervals. To enforce a certain cost on the Sybil attacker that is acquired for every identity that introduces into the network. Each node in the network is periodically monitor and re-verifies or might be charges with costs or fees for one time. Recurring fees is stronger than the one time fees