[tor-bugs] #9166 [Tor]: Write a UTP-based channel implementation
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Sun Aug 4 14:20:08 UTC 2013
#9166: Write a UTP-based channel implementation
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Reporter: nickm | Owner:
Type: defect | Status: new
Priority: normal | Milestone: Tor: unspecified
Component: Tor | Version:
Keywords: tor-relay utp | Parent: #9165
Points: | Actualpoints:
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Comment(by yawning):
I've also linked this on #tor-dev, but eventually libutp will need to be
changed.
Security analysis of the micro transport protocol with a misbehaving
receiver
http://openaccess.city.ac.uk/1967/1/cyberc12%2Dflorian%2Dpaper%20pdf.pdf
Of particular note is:
{{{
Therefore a good countermeasure against the delay attack yields to a
complete redesign of the LEDBAT congestion control. That is why we
don not[sic] propose a countermeasure against this attack and point
here to further research.
}}}
LEDBAT by design will yield to competing traffic anyway, so it's not the
right congestion control algorithm for Tor. Implementing Reno+SACK
shouldn't be too difficult as a starting point (a more modern algorithm
like CUBIC could also be used).
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9166#comment:16>
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