A Sybil Attack, a familiar threat for peer-to-peer networks, is an attack in which a malicious entity can take over control of a network by creating a large number of mirroring pseudonymous entities, thus enabling the attacker to seize control of voting or consensus mechanisms.
One of the methods of establishing Sybil-resistance within a network is to set an economic cost as a barrier to entry to the network, thus dissuading potential attackers from launching a Sybil Attack by making the cost of creating those mirror entities too high for the attack to be economically feasible.
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