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[tor-bugs] #24987 [Core Tor/Tor]: Implement prop#269 "Hybrid Handshakes" (composition module)

#24987: Implement prop#269 "Hybrid Handshakes" (composition module)
-------------------------+-------------------------------------------------
     Reporter:  isis     |      Owner:  (none)
         Type:           |     Status:  new
  enhancement            |
     Priority:  Medium   |  Milestone:  Tor: 0.3.4.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  post-quantum, cryptography, tor-
     Severity:  Normal   |  circuit, handshakes
Actual Points:           |  Parent ID:  #24985
       Points:           |   Reviewer:
      Sponsor:           |
  Sponsor3               |
-------------------------+-------------------------------------------------
 As part of #24985, we'll need to implement
 [https://gitweb.torproject.org/torspec.git/tree/proposals/269-hybrid-
 handshake.txt prop#269]. This should probably be in two parts:

  1) Implement a new module which, given function pointers to two
 handshakes (one classic and the other post-quantum secure) which follow
 some prescribed API, compose the handshakes together to produce a final
 shared secret
  2) Implement "hybrid null" (as it's called in the proposal), which here
 I'm calling "ntor2"

 This ticket is about part 1.  It depends upon #24986 as well.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24987>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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