[tahoe-lafs-trac-stream] [tahoe-lafs] #2018: padding to hide the size of plaintexts

[tahoe-lafs]

#2018: padding to hide the size of plaintexts
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     Reporter:  zooko    |      Owner:
         Type:           |     Status:  new
  enhancement            |  Milestone:  undecided
     Priority:  normal   |    Version:  1.10.0
    Component:  code-    |   Keywords:  confidentiality privacy compression
  encoding               |  newcaps
   Resolution:           |
Launchpad Bug:           |
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Comment (by zooko):

 Comments from Marsh Ray:

 * I like the length hiding idea. Be sure the pad length gets derived from
 the key via a strongly one-way path.
 * Would file access patterns reveal the amount of padding? Would it ever
 make sense to distribute padding over the whole file?
 * "you might use 32*ceil(log₂(F)) to hide F a little better"

 from https://twitter.com/marshray/status/354028204446584832

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2018#comment:4>
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