> I wonder, in general can we have nice things? Can we finally have a > cryptographic messaging system that protects against intersection > attacks? To that end I've been putting together a reading list so that
If my understanding is correct, the answer is No. No we cannot prevent longterm intersection attacks by using decoy traffic in the katzenpost/loopix system because users will go offline and come back online later which changes the anonymity set size and thus leaks information to a global network observer. I suspect that there are mixnet use cases which are not vulnerable or less vulnerable to this... such that user or application behavior does not form a "session" where users send multiple messages over long periods which can be linked by a passive observer.
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