http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/proposals/344-protocol-info-leaks.html
It is
unknown how long such attacks take, but it is a function of the number of
users under consideration, and their connection durations. The research interest here is in determining what can be done to increase the
amount of time these attacks take, in terms of increasing connection duration,
increasing the number of users, reducing the total number of Guard relays,
using a UDP transport, or changing...