[mail-vet-discuss] Proposed "header.b" tag for DKIM signatures

Murray S. Kucherawy msk at cloudmark.com
Wed Mar 24 14:37:43 PDT 2010

> -----Original Message-----
> From: mail-vet-discuss-bounces at mipassoc.org [mailto:mail-vet-discuss-
> bounces at mipassoc.org] On Behalf Of Victor Duchovni
> Sent: Wednesday, March 24, 2010 1:56 PM
> To: mail-vet-discuss at mipassoc.org
> Subject: Re: [mail-vet-discuss] Proposed "header.b" tag for DKIM
> signatures
> On Wed, Mar 24, 2010 at 09:01:46AM -0700, Murray S. Kucherawy wrote:
> > I propose that we need a new tag, "header.b", which will contain the
> > first several characters of the actual digital signature, which is
> pretty
> > much guaranteed to be unique among signatures present.  This will
> allow
> > unambiguous matching of signatures with results.
> I sense some conflict between "pretty much guaranteed" and
> "unambiguous".
> How many signature bytes are you proposing to use?

The spec says a minimum of eight, but enough to be able to be unambiguous.  A few security types around the IETF I've polled about this seem to think that's adequate.

Do you have another suggestion?

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