Background
Anonymity networks have been developed and many have introduced methods of proving the anonymity guarantees that are possible, originally with simple Chaum Mixes and Pool Mixes the size of the set of users was seen as the security that the system could provide to a user. This had a number of problems; intuitively if the network is international then it is unlikely that a message that contains only Urdu came from the United States, and vice-versa. Information like this and via methods like the predecessor attack and intersection attack helps an attacker increase the probability that a user sent the message.
Read more about this topic: Degree Of Anonymity
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