Vitalik quoting Satoshi who expanded upon Leslie L?
Vitalik was quoted by trustnodes.com with a
solution but later had emended via twitter the idea was from Leslie L.
in the same article trustnodes.com linked to a post of Satoshi where he explains the idea.
same idea with two paths from Vitalik to Leslie L and Satoshi. interesting IMO.
the
idea is about to improve the fault tolerance of a consensus algorithm to more than 50 percent (keyword: 51% attack).
If you add even more assumptions (specifically, you require observers to also be actively watching the consensus, and not just downloading its output after the fact), you can increase fault tolerance all the way to 99%.
EDIT: new topic -->
https://bitcointalk.org/index.php?topic=4883276