Re: dm-crypt, new IV and standards

[David Wagner]

Jean-Luc Cooke  wrote:
>Christophe and I's scheme of IV = firstIV + blockNum
>for initial setup and IV = IV + 2^64 for IV updates will work fine

That's not ideal.  I'd suggest IV = HMAC_k(firstIV, blockNum) or somesuch.
Sequential IV's aren't a good choice with CBC -- they can leak a little
bit of information about the first block of plaintext, in some cases.
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