Re: dm-crypt, new IV and standards

From: Jean-Luc Cooke
Date: Mon Mar 08 2004 - 15:16:00 EST

Agreed. Good catch David.


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.

Suite 4560 CTTC
1125 Colonel By Dr.
Ottawa ON, K1S 5B6
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at