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  • The Tor Project
  • Core
  • ArtiArti
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  • #62

Implement connection padding (link protocol 5)

Tor has a link padding mechanism to avoid some kinds of flow-based traffic analysis. We should probably implement it some time, but it isn't as critical as some of the other stuff.

Likely subtasks:

  • Reschedulable timed-event API (may be shared somewhat with #180 (closed))
  • Track time of last send activity on each channel (est 2h)
  • Ability to launch a task to run the padding algorithm on a live channel. (6h)
  • Launch padding algorithm on certain live channels, according to padding-spec rules. (4h)
  • Padding negotiation; reduced padding negotiation. (8h)
  • Pad by default when link protocol >= 5 is in use. (2h)
  • Implement all network parameters in padding-spec section 2; pass them around as appropriate. (4h)
  • Some way to make sure padding is turned off when very dormant? (6h)
  • Discuss and clarify any ambiguities we find in padding-spec section 2. (8h)
Edited Aug 18, 2022 by Ian Jackson
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