Definition ∞ A Sybil attack is a security threat where a single malicious actor creates multiple fake identities or nodes to gain disproportionate influence within a network. This tactic aims to disrupt consensus mechanisms, manipulate voting processes, or overload network resources. The attack exploits the assumption that distinct identities represent distinct entities.
Context ∞ Sybil attacks remain a significant concern for decentralized networks, particularly those relying on identity or reputation systems for their operation. Discussions often focus on the effectiveness of various Sybil resistance mechanisms, such as proof-of-personhood systems, staking requirements, or sophisticated identity verification protocols. Developers are continually seeking novel approaches to prevent malicious actors from subverting network integrity through the creation of numerous pseudonymous entities.
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