Sybil Attack

A Sybil attack is a security threat in peer-to-peer networks where a single adversary controls multiple nodes, known as Sybil nodes. The attacker creates multiple pseudonymous identities to gain a disproportionately large influence on the network. In the context of blockchain, a Sybil attack can disrupt the consensus mechanism, which is crucial for maintaining the integrity and security of the blockchain network.

In a Sybil attack, the attacker creates multiple false identities (nodes) in the network. These nodes can then be used to carry out various malicious activities, such as double-spending in a cryptocurrency network or manipulating the consensus mechanism in a blockchain network. The attacker can also use these nodes to disrupt the network’s operations or to gain an unfair advantage, such as mining more blocks in a Proof of Work (PoW) system.

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