Re: Counter Mode: Proposed Way Forward

[Russ Housley <housley@vigilsec.com>]

Paul:

>  Russ> Paul: We could do that, but I am hoping that people will be
>  Russ> interested in CCM once the new ESP gets rolling.  CCM uses the
>  Russ> flags field, but it cannot be zero.  This would make it very
>  Russ> easy for an implementation to support CCM and this counter mode
>  Russ> specification too.
>
>It's hard to comment specifically since I don't know what CCM is or
>where to get a spec for it.

See draft-housley-ccm-mode-01.txt.

It has been discussed on the CFRG mail list.  I hope it will be published 
as in Informational RFC.

>Would CCM be a different transform?  I assume yes.  If so, then it has
>its own encoding rules.  There's no reason for transform X to
>incorporate a field that's only used in transform Y (X != Y).

Good point.

Russ