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Mechanism for resisting targetted backdoors in Tor

At the PET workshop (http://petworkshop.org/2006) I gave a brief talk
on a simple idea relating to Tor. One known weakness of open source
software is that, even if the source is well auditied, an attacker
could still implant a backdoor in the version downloaded by one
person, and have a very low chance of detection.

I suggested a mechanism for allowing users to detect if they were the
victim of such a targetted attack. The threat is very specialised and
the solution is not foolproof but I hope it will be of interest.

I describe the basics of the idea in this blog post:
Also, there are more details in the comments.

I would be happy to receive any questions or comments.


w: http://www.cl.cam.ac.uk/users/sjm217/

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