When sending messsages to a Mix we need to use padding so all of them have different sizes

An statistical disclosure attack observes communication frequencis over time to determine the probability of a future communication

A typical defense against n-1 attacks is the use of dummy traffic

A Mixnet uses a layered encryption scheme to combine more than one Mix

Dummy traffic is usually modelled with an exponential distribution

A Stop-and-go Mix adds a random delay to each message

The average time for a message to be transmitted by a Threshold Mix is lower than by a Pool Mix

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

When a Pool Mix accumulates a given number of messages, it outputs a randomly subset of messages

In a Threshold Mix with a threshold T, the anonymity set has cardinality T