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

From: David Wagner (
Date: Sat Oct 14 2000 - 12:09:04 EST

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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