Re: A patch to loop.c for better cryption support

[David Wagner]

IV's should never be repeated (per key).  If you are using CBC mode,
they should not be just a counter, either (for different reasons).

A simple implementation technique is simply to use the encryption of
a block number / sector number / counter as your IV.  This ensures that
IV's don't repeat and that they all look cryptographically random.
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