[tor-bugs] #3038 [Tor Directory Authority]: Update dir-spec.txt with microdesc, consensus-flavor info

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#3038: Update dir-spec.txt with microdesc, consensus-flavor info
-------------------------------------+--------------------------------------
 Reporter:  nickm                    |          Owner:  nickm             
     Type:  defect                   |         Status:  needs_review      
 Priority:  major                    |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Directory Authority  |        Version:                    
 Keywords:                           |         Parent:  #4933             
   Points:                           |   Actualpoints:                    
-------------------------------------+--------------------------------------

Comment(by rransom):

 >        [Should we mention that clients don't learn identity keys anymore
 >        with this approach?  Clients only need identity keys for their
 >        entry guards, and in that case they learn the identity key from
 >        the TLS handshake.  But clients couldn't check identity keys of
 >        non-entry nodes with the microdescriptor approach anymore, even
 if
 >        they wanted. -KL]

 The microdesc consensus still contains every relay's identity key
 fingerprint, which (with Tor's current link protocols) is enough for a
 client or relay to verify that it is opening an OR connection to the right
 destination relay.

 Clients have never been able to check the identity keys of relays which
 they do not connect to directly; that's why Tor uses ‘onion keys’ to
 authenticate relays in its circuit-extension handshake protocol.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3038#comment:10>
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