シビル攻撃（Sybil Attack）
IDなりすまし攻撃。
Named after the book 'Sybil' (about a woman with multiple personalities), this attack happens when someone creates thousands of fake accounts to cheat in voting systems, skew reputation scores, or manipulate airdrops. Decentralized networks defend against this using mechanisms like Proof of Work, Proof of Stake, or Proof of Humanity.
graph LR
Center["シビル攻撃（Sybil Attack）"]:::main
Pre_network_security["network-security"]:::pre --> Center
click Pre_network_security "/terms/network-security"
Pre_consensus_mechanisms["consensus-mechanisms"]:::pre --> Center
click Pre_consensus_mechanisms "/terms/consensus-mechanisms"
Rel_51_percent_attack["51-percent-attack"]:::related -.-> Center
click Rel_51_percent_attack "/terms/51-percent-attack"
Rel_dao_governance["dao-governance"]:::related -.-> Center
click Rel_dao_governance "/terms/dao-governance"
Rel_byzantine_fault_tolerance["byzantine-fault-tolerance"]:::related -.-> Center
click Rel_byzantine_fault_tolerance "/terms/byzantine-fault-tolerance"
classDef main fill:#7c3aed,stroke:#8b5cf6,stroke-width:2px,color:white,font-weight:bold,rx:5,ry:5;
classDef pre fill:#0f172a,stroke:#3b82f6,color:#94a3b8,rx:5,ry:5;
classDef child fill:#0f172a,stroke:#10b981,color:#94a3b8,rx:5,ry:5;
classDef related fill:#0f172a,stroke:#8b5cf6,stroke-dasharray: 5 5,color:#94a3b8,rx:5,ry:5;
linkStyle default stroke:#4b5563,stroke-width:2px;
🧒 5歳でもわかるように説明
一人の人が100枚のお面をかぶって、100人のふりをして多数決をインチキすることです。
🤓 Expert Deep Dive
Crucial for peer-to-peer systems. Defense strategies include: 1. Resource-based (PoW/PoS), 2. Social-based (Vouching/Trust Networks), 3. Biometric (Iris scans), and 4. Fee-based (Making identity creation expensive).