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But it's not that simple if the client is running as a relaying node as well, is it? The mixture of client traffic and relay traffic would make traffic analysis
by justsee 16y ago
But it's not that simple if the client is running as a relaying node as well, is it? The mixture of client traffic and relay traffic would make traffic analysis much more difficult.
Of course if you're that interesting that your ISP is doing traffic analysis on your connection you quite possibly have more pressing security issues.
- gwern 16y agoMerely reduces the statistical power, doesn't make the inferences go away completely. And there may be techniques for filtering out relayed material - perhaps relay traffic emerges from the node quickly enough that an observer can then figure out what entering traffic was just being relayed and remove it from consideration (always a concern with a high-performance mix network since you can't randomize retransmission as strongly as you could with email mix networks like Mixmaster where you could wait hours, without rendering it unusable) or relay traffic is constant enough that one can assume any 'spikes' are the user's traffic.
- mike-cardwell 16y agoRelay traffic should be easy enough to identify and filter out. If you think about it, all incoming relay traffic is mirrored on the way out. Obviously it's re-encrypted, but the amount and direction of data remains the same. It adds complexity to the attack, but doesn't negate it completely.