[tor-bugs] #8089 [Stegotorus]: Implement the handshake and key exchange as described in the paper
Tor Bug Tracker & Wiki
blackhole at torproject.org
Thu Mar 27 17:29:16 UTC 2014
#8089: Implement the handshake and key exchange as described in the paper
----------------------------+-------------------
Reporter: vmon | Owner: zwol
Type: defect | Status: new
Priority: critical | Milestone:
Component: Stegotorus | Version:
Resolution: | Keywords:
Actual Points: | Parent ID: #8099
Points: |
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Comment (by zwol):
One of the reasons I have been making noises about UDP-based link
protocols is that it would be nice not to need the special one-block
cipher for Stegotorus block headers. If we can transmit the length in
cleartext we can encrypt the rest of the block header using the same
authenticated cipher as the payload. (If the length is encrypted, it
can't be used to determine the offset to the MAC until it itself is
authenticated, or you give the attacker a chosen-ciphertext oracle.) UDP
would give us cleartext block length for free. On the other hand, doing
that might make life harder for steg modules, which now have to conceal a
decidedly-nonrandom length field somewhere.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8089#comment:9>
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