> How would this work without extra storage for the IV?
And Chris Wedgewood replied:
> The IV could be a function of the block number and some secret.
Um, not good enough. The IV should involve some per-disk secret, just
on general principles, but it has to change every time the data in the
block changes, i.e. the IV for a particular block on a particular
drive using a particular key should not be fixed.
See the SFS docs for how to do it.
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