http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/proposals/251-netflow-padding.html
If X is a random variable uniform from 0..R-1 (where R=high-low), then the
random variable Y = max(X,X) has Prob(Y == i) = (2.0*i + 1)/(R*R).
Then, when both sides apply timeouts sampled from Y, the resulting
bidirectional padding packet rate is now a third random variable:
Z = min(Y,Y).