OT: Email signing
Michael H. Warfield
mhw at WittsEnd.com
Tue Jan 31 21:12:15 UTC 2006
On Tue, 2006-01-31 at 14:55 -0600, Michael Yep wrote:
> This did not sign properly
> I got a message : gpg command line and output:,C:\\gnupg\\gpg.exe
> --charset utf8 --batch --no-tty --status-fd 2 --verify,gpg: CRC error;
> c8aba6 - dc3c8a,gpg: quoted printable character in armor - probably a
> buggy MTA has been used
Hmmm... What MUA where you using?
This looks to be a "Content-Transfer-Encoding" issue. If it's not
nested the GPG signature has no MIME "Content-Transfer-Encoding". If
it's nested within an S/MIME signed wrapping, it's been set to and
encoded "Content-Transfer-Encoding: quoted-printable". The encoding is
correct but your MUA failed to unencode it before trying to verify it.
So GPG complains that it ran into a quoted-printable escape, which it
did (but it's certainly not the MTA's fault here). So the question is,
did Evolution make an error when it encoded the GPG signature
quoted-printable or did the receiving MUA make the error when it failed
to honor it. This is exactly the kind of compatibility errors one might
expect.
> Michael H. Warfield wrote:
> > I guess it would have helped if I had actually flipped the S/MIME bit
> > BEFORE hitting send. The previous message did not have the S/MIME
> > signature. This one should. :-( I doubled checked it this time...
> >
> > Mike
> >
> > On Tue, 2006-01-31 at 15:32 -0500, Michael H. Warfield wrote:
> >
> >>On Tue, 2006-01-31 at 23:47 +1030, Tim wrote:
> >>
> >>>On Mon, 2006-01-30 at 23:36 -0600, Arthur Pemberton wrote:
> >>>
> >>>>1) Can I do both SMIME and PGP in my emails?
> >>
> >>>I wouldn't think so. A signature is added to a message as confirmation
> >>>that the message hasn't been tampered with, therefore its based on the
> >>>message contents.
> >>
> >>>Conjecture, because adding a signature adds to the contents: If you
> >>>were to add one then the other, the first signature would try to
> >>>proclaim the message to be okay. The second signature added would try
> >>>to proclaim the message with the first signature, in combination, to be
> >>>okay. But adding the second signature changed the message, so anyone
> >>>trying only to use the first signature (because that's all that their
> >>>client supported) would see the message had been changed (by the second
> >>>signature).
> >>
> >> This message should be signed by both S/MIME and PGP, so, yes, it's
> >>"possible". In this case, the signatures do nest in a nested multipart
> >>MIME hierarchy. The message body is encoded quoted-printable in one
> >>MIME part. The encoded part is then signed and the signature is in
> >>another MIME part. That assemblage is nested in another MIME part which
> >>is then S/MIME signed and that forms another MIME part.
> >>
> >> Message ----
> >> Mime S ----
> >> Mime P ----
> >> Body
> >> Mime P ----
> >> GPG signature on Body
> >> Mime P ----
> >> Mime S ----
> >> S/Mime Signature on Mime P
> >> Mime S ----
> >> Message ----
> >>
> >> Now, why anyone would want to do this, I don't know. But it obviously
> >>is possible and Evolution will, obviously, do it. In theory, this
> >>should work. No guarantees about any and all clients being able to read
> >>and verify it, however. Evolution certainly handles it. I've seen
> >>enough compatibility problems between varying clients just withing pure
> >>PGP/GPG and within pure S/MIME to have any expectations here.
> >>
> >> My S/MIME certificate is signed by the CACert.org, <www.cacert.org>,
> >>root certificate. Maybe we'll see who can verify either with what...
> >>
> >> Mike
> >>--
> >>fedora-list mailing list
> >>fedora-list at redhat.com
> >>To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
> >>
>
> --
> Michael Yep
> Development / Technical Operations
> RemoteLink, Inc.
> (630) 983-0072 x164
>
> GPG Public Key
> http://pgpkeys.mit.edu:11371/pks/lookup?op=get&search=0x126439D9
>
--
Michael H. Warfield (AI4NB) | (770) 985-6132 | mhw at WittsEnd.com
/\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/
NIC whois: MHW9 | An optimist believes we live in the best of all
PGP Key: 0xDF1DD471 | possible worlds. A pessimist is sure of it!
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