[tor-bugs] #18638 [Tor]: Write a proposal for PK handshake that uses more client resources than server.

Tor Bug Tracker & Wiki blackhole at torproject.org
Fri Mar 25 21:37:17 UTC 2016


#18638: Write a proposal for PK handshake that uses more client resources than
server.
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:
         Type:  task          |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Tor           |    Version:
     Severity:  Normal        |   Keywords:  dos
Actual Points:                |  Parent ID:
       Points:  medium/large  |   Reviewer:
      Sponsor:  SponsorU-can  |
------------------------------+--------------------------------
 Our current handshakes (TLS, TAP, ntor, and ) all have resource
 asymmetries: a client can send junk with very little effort, and thereby
 cause a server to spend more CPU.  We could instead look for ways to make
 sure that a client cannot force servers to spend X resources without
 themselves spending something in vicinity of X resources.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18638>
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