[tor-bugs] #8742 [Tor]: Byte history leaks information about local usage/hidden services
Tor Bug Tracker & Wiki
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Fri Apr 19 15:21:46 UTC 2013
#8742: Byte history leaks information about local usage/hidden services
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Reporter: alphawolf | Owner:
Type: defect | Status: new
Priority: normal | Milestone: Tor: unspecified
Component: Tor | Version: Tor: 0.2.4.12-alpha
Keywords: byte-history stats tor-hs privacy tor-relay | Parent:
Points: | Actualpoints:
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Comment(by alphawolf):
Replying to [comment:1 nickm]:
> Directory caches also write more than they read.
True... but in this case I happen to know that his particular relay has
had a DirPort open for months, and began hosting a hidden service/relaying
local network traffic around Apr-7. The divergence of read/write bytes is
pretty obvious at that point. Prior to that date there is only a slight
bias to more write traffic. Accepting that other directory caches might
have a more pronounced bias, I still believe the attack I describe would
be successful, as the attacker could create a divergence pattern that
would be otherwise unlikely. It would of course require testing to
confirm.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8742#comment:2>
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