Bitcoin Magazine
How CoinJoin Anonymity Can Be Undermined Using Clustering
Anonymity is the end goal when studying privacy, and it’s useful to think of de-anonymization as a game.
We imagine an adversary with some access to information, and it tries to guess correctly who among a set of candidates was responsible for some event in the system. To defend against the adversary winning, we need to keep it guessing, which could either mean limiting its access to information or using randomness to increase the amount of information it needs to succeed.
Many readers will be familiar with the game of “Guess Who?”. This game could be described as a turn-based composition of two instances of the more general game “twenty questions.” In “twenty questions,” you secretly choose an element from a given set, and your opponent tries to guess it correctly by asking you up to 20 yes-or-no questions. In “Guess Who?” both sides take turns playing against each other, and th
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