Sybil Attack

A Sybil Attack is a security threat in a decentralized network where a single malicious entity creates and controls numerous fake identities, or "Sybil nodes," to gain a disproportionate amount of influence or control, thereby subverting the network's consensus or reputation system. This attack is particularly dangerous in permissionless blockchain environments, decentralized autonomous organizations (DAOs), and peer-to-peer (P2P) systems, where it can be used to dominate voting, censor transactions, or double-spend cryptocurrency.