A common defense for statistical disclosure attacks is the use of dummy traffic to generate constant communication patterns

In a n-1 attack, the attacker attempts to send 1 message to the Mix when it is empty

A Mixnet is vulnerable to passive global adversaries

The use of dummy traffic does not necessarily increases privacy in a Threshold Mix

When a Stop-and-go Mix accumulates a given number of messages, it outputs all of them at the same time

The average time for a message to be transmitted by a Threshold Mix or a Pool Mix is the same

In general, a Thread Mix provides more privacy than a Pool Mix

When a Pool Mix accumulates a given number of messages, it outputs all of them at the same time

In a Threshold Mix with a threshold T=4, the anonymity set has a cardinality of 8

A Threshold Mix keeps all the messages until the number of messages reaches a given threshold