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grarpamp
Fill / chaff seem needed, otherwise in an all wheat network, input traffic on one side seems to match output traffic on the other side at some point, regardless of storage / delay. Fixed packet sizes seem to help. Fill ratios up to 100% utilization can mask the wheat. Minimum fill is amount needed for plausible deniability that single input can't be mapped to a single output. ie: 10MiB in, must have at least two outputs that received 10MiB.
This stuff has been in daily use since the last millennium. The links below are out of date but should get you started.
Is there any group / list that is actively researching or developing such networks? Or that wants to?
See usenet newsgroup alt.privacy,anon-server
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-- StealthMonger