Add "no peer authentication" to the list of client identification methods in tor-spec
CREATE_FAST is no longer a reliable client discriminator:
If an OR sees a circuit created with CREATE_FAST, the OR is sure to be the first hop of a circuit. ORs SHOULD reject attempts to create streams with RELAY_BEGIN exiting the circuit at the first hop: letting Tor be used as a single hop proxy makes exit nodes a more attractive target for compromise.
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