Definition ∞ Sybil attacks are a type of security threat in decentralized systems where a single malicious entity creates multiple fake identities or nodes to gain disproportionate influence over the network. By controlling a majority of identities, the attacker can manipulate consensus mechanisms, censor transactions, or double-spend funds. This attack undermines the decentralization and integrity of peer-to-peer networks. Robust identity verification or resource-intensive participation mechanisms are defenses against such attacks.
Context ∞ Preventing Sybil attacks remains a significant challenge for the security and decentralization of many blockchain networks. A key discussion involves designing consensus algorithms and identity protocols that are resilient to such manipulation without compromising privacy. Critical future developments include advancements in proof-of-personhood solutions and reputation systems that can effectively differentiate legitimate participants from malicious imposters in decentralized environments.
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