Source: Sybil attack on Wikipedia
Sybil attacks are also called sock puppetry
Creating a large number of pseudonymous identities and uses them to gain a disproportionately large influence (e.g. control of >50% nodes allows you to ‘override’ the consensus)
3E’s of Preventing Sybil Attacks
- Entry Cost
- Existence Cost
- Exit Penalty
See also: fault tolerance