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Re: following on from today's discussion
A simple example of modifying traffic:
http://www.schneier.com/blog/archives/2006/08/stealing_free_w.html
http://www.ex-parrot.com/~pete/upside-down-ternet.html
Could be easily applied to Tor exit point too.
However, sniffing is not a problem if you are visiting only public
webistes (do not exchange any personal information), But traffic
injection could be.
Remember Penet remailer? They were accused to help distribute child
pornography. It was not true, and it was proved so later. But Penet
admin decided to shut down the service anyway because of public preasure.
I am a little worried, that "someone" will try to destroy Tor network by
sniffing, injecting, downloading child pornography/hacking through Tor
and doing other nasty things...
I was thinking about a solution to prevent traffic injection in
non-encrypted public websites. What about having TWO conection open and
do some kind of checking if the content is the same (maybe access the
content from two different locations and do some MD5 check). I know the
idea is hard to implement, since website can serve different content for
each location or every second, and this could also mean double load of
Tor network. But maybe someone will develop my idea into the usable
form... If not, feel free to drop it away.
bye, Matej