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Reply-block based pseudonym systems are broken? [Was: Re: SURB-Format]

Hello,


On Mon, 18 Jun 2007, Len Sassaman wrote:
However, reply-block based pseudonym systems are broken, completely. If
that might influence your direction with this, you may want to consider
those problems.

Nick's work in The Pynchon Gate (WPES, 2005) demonstrates that nym
servers, even SURB-based ones, that are based on mixes and reply blocks
fall victim to intersection attacks within a month's worth of traffic
*sent to the nym*. (Probably even more quickly now, based on the rise of
spam in the last few years.)

(See Section 4.2 of that paper, available here:
http://www.cosic.esat.kuleuven.be/publications/article-620.pdf )
link:
 http://archives.seul.org/mixminion/dev/Jun-2007/msg00001.html


How trivial is this type of attack?  What does this mean for the current state and future of MixMaster and MixMinion?  What is the dev stage of "The Pynchon Gate"?

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