[tor-bugs] #22963 [Core Tor/Tor]: Make relay integrity digests harder to guess by padding cells with random bytes

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#22963: Make relay integrity digests harder to guess by padding cells with random
bytes
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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:  security      |  Actual Points:
Parent ID:  #22948        |         Points:
 Reviewer:                |        Sponsor:
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Comment (by teor):

 We could random pad the unused bytes in RELAY_DATA cells, because we're
 unlikely to extend them.

 But any other types are really hard to random-pad, because we want that
 space to add future fields in, and zero is a useful default.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22963#comment:2>
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