[vlabakje90]

Going by the definition given in the wiki you’ve linked, a Sybil attack is about creating many fake identities to gain disproportionate influence in a network. A 51% attack in blockchain terms is specifically about controlling the majority of the network’s mining/staking power to override consensus.

So I'd say they're not exactly the same.

[ceejayoz]

Someone amassing 51% of the network would probably want to do so under some fake identities so others don't realize what's about to happen. Not the same, but probably related.

[delfinom]

Lol, there's no such thing as "fake identities" here. You just run more miners with different payout addresses for mining. But there is no "fake"

[ceejayoz]

> You just run more miners with different payout addresses for mining.

That it's dramatically easier to conceal your identity doesn't mean concealing your identity isn't useful.