Exchanging with PGP users

Michael H. Warfield mhw@wittsend.com
Mon Feb 5 19:05:00 2001

On Mon, Feb 05, 2001 at 03:52:00PM +0100, Jan Petranek wrote:

> On Sat, 3 Feb 2001, Subba Rao wrote:

> > I am looking for any information that can allow GnuPG and PGP users to exchange
> > information securely. Is there any plugin or so for GnuPG to send PGP users
> > messages? Some of my friends are well trenched into PGP and shrug off GnuPG.
> > How can I read their messages sent to me? I have GnuPG 1.0.4.

> Actually, you don't need any plugins or stuff like that. Since GnuPG is
> based on OpenPGP and OpenPGP is based on PGP 5.0, all should work out
> fine.

> Indeed, for trial purposes I have tried using pgp 5.0 and gpg 1.04 at the
> same time (both on linux). I was able to
> - generate keys with both programs
> - export the public key from gpg
> - import the public keys to pgp
> - encrypt with pgp to the public key
> - also, to sign it with pgp (using another key, generated with pgp)
> - decrypt with gpg
> - and, best of all, do the whole thing the other way round (encrypt with
> gpg and read with pgp)

> But if your friends are using PGP 5, so you better use the
> force-v3-sigs
> option (as found in .gnupg/options), as it makes gpg behave more
> compliant. If your friends are using pgp2.6x or pgp with IDEA-encryption,
> you should tell them to switch to pgp 5 or later.
Some won't for various and sundry reasons, including paranoia. I haven't tried sending idea encrypted E-Mail, but GnuPG can certainly read E-Mail that has been encrypted by 2.6. It takes added a few flags and loading the idea module, but it does work.
> Hope I could help,

> JanP

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Mike -- Michael H. Warfield | (770) 985-6132 | mhw@WittsEnd.com (The Mad Wizard) | (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!