Sybil Attack : Bitcoin, Ethereum, blockchain, Cryptocurrency

[troll]

By definition:

A Sybil attack occurs when one actor acts as multiple separate entities. Because many distributed systems have no form of identity management beyond accounts, and because accounts are trivially created, any actor can create an unbounded number of accounts.

Avoiding Sybil attacks is difficult. In centralized systems it can be done through heuristics that do not provide cryptographic assurance of Sybil resilience. For example, a centralized entity may try to avoid Sybil attacks by requiring that an individual IP cannot create more than a specific number of user accounts in a given time interval.

Sybil attacks are avoided in Bitcoin by requiring block generation ability to be proportional to computational power available through the proof-of-work mechanism. That way, an adversary is limited in how many blocks they can produce. This provides strong cryptographic guarantees of Sybil resilience.

For Ethereum and DAPP networks it is a bit harder, for instance, you want to implement a voting system, or in other situations where who someone is, or whether two different identifies refer to the same person matters, such as an auction (where allowing the seller to bid on their own items would give them an unfair advantage).

https://bitcoin.stackexchange.com/questions/50922/whats-a-sybil-attack
https://ethereum.stackexchange.com/questions/3374/what-is-a-sybil-attack

[CryptoZenWorld]

Hi mate,
Thanks for your helpful post. I think everyone should have good knowledge about blockchain and cryptocurrency. So that they can choose the best project and differentiate project quality and also can identify any fault or problems.

We all should remember that knowledge is power.

+ karma for you mate. Expecting more valuable post from you.

[Munareal]

In a Sybil attack, the attacker subverts the reputation system of a peer-to-peer network by creating a large number of pseudonymous identities, using them to gain a disproportionately large influence. those with multiple identities are sometimes known as sockpuppets. A sockpuppet is an online identity used for purposes of deception