[tor-bugs] #22948 [Core Tor/Tor]: Padding, Keepalive and Drop cells should have random payloads

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#22948: Padding, Keepalive and Drop cells should have random payloads
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 Reporter:  teor                      |          Owner:
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor              |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tor-spec, security-maybe  |  Actual Points:
Parent ID:  #18856                    |         Points:  0.5
 Reviewer:                            |        Sponsor:
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Comment (by arma):

 Replying to [comment:4 teor]:
 > Is there any reason for padding cells to have random payloads?

 Yes, the end-to-end circuit digest includes the payloads of all the cells
 received, and random payloads are not easy to predict. For example, it
 would reduce vulnerability to attacks where one side produces a valid
 digest without actually receiving the cells that it is acknowledging.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22948#comment:6>
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