[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3230: Consider switching from AES CTR to AES XTS

[Tahoe-LAFS]

#3230: Consider switching from AES CTR to AES XTS
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  code     |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 After discussion with #cryptography-dev about random access AES CTR
 support in the `cryptography` library, it sounds like a better move would
 be for Tahoe-LAFS to switch this primitive to AES XTS instead.  AES XTS is
 designed with random access in mind.

 Obviously there are more factors to consider than *just* ease of random
 access.  The outcome of this ticket should be an enumeration and
 consideration of all such factors along with a decision about whether they
 indicate sticking with AES CTR or switching to AES XTS.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3230>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage