http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/proposals/116-two-hop-paths-from-guard.html
First I will describe the details of the strategy, as well as possible
avenues of attack. Then I will list advantages and disadvantages. Then, I
will discuss some possibly safer variations of the strategy, and finally
some implementation issues.
Details:
Suppose Alice is an entry guard, and wants to construct a two hop circuit.