Re: dm-crypt, new IV and standards

[Jean-Luc Cooke]

Agreed.  Good catch David.

JLC

On Wed, Mar 03, 2004 at 09:40:05PM +0000, David Wagner wrote:
> 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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