Re: Counter Mode: Proposed Way Forward

[Russ Housley <housley@vigilsec.com>]

Paul:

We could do that, but I am hoping that people will be interested in CCM 
once the new ESP gets rolling.  CCM uses the flags field, but it cannot be 
zero.  This would make it very easy for an implementation to support CCM 
and this counter mode specification too.

Russ

At 12:52 PM 11/27/2002 -0500, Paul Koning wrote:
> >>>>> "Russ" == Russ Housley <Housley> writes:
>
>  Russ> ...
>  Russ> I propose the replacement of the truncated SPI with the 24 most
>  Russ> significant bits form the IKE nonces.  I propose that the
>  Russ> initiator use 24 bits from its own nonce, and the responder use
>  Russ> 24 bits from its own nonce. ...
>
>  Russ> Unless I hear an uproar on the list, I will update the draft to
>  Russ> reflect this way forward.
>
>Sounds good.
>
>How about losing the flags field, since it appears to serve no
>purpose, and using 32 bits of nonce?
>
>         paul