PGP 5.x and GnuPG

L. Sassaman
Thu, 16 Mar 2000 17:50:50 -0800 (PST)

Hash: SHA1

On Fri, 17 Mar 2000, Trevor Smith wrote:

> I've been reading through web resources on GnuPG and can't find a
> definitive answer to an issue that seems to me to be THE issue for
> any current PGP 5.x user interested in switching to GnuPG. The issue
> is basic interoperability between PGP and GnuPG and, I believe, is
> summed up in these four questions:
> 1. Can GnuPG encrypt messages using a public key generated by PGP
> 5.x?
> 2. Can PGP 5.x encrypt messages using a public key generated by
> GnuPG?
If is is a v3 key.
> 3. Can PGP 5.x verify the authenticity of messages which have been
> GnuPG signed?
> 4. Can GnuPG verify the authenticity of messages which have been PGP
> 5.x signed?
> Also, do the answers to the above questions change if "PGP 5.x" is
> substituted with "even more recent versions of PGP"?
Yes. GnuPG and PGPcommandline 6.x and up all have the capability to generate a more enhanced key format, which confuses PGP 5. Anyone using PGP 5 should think about upgrading to PGP 6.5.2 or GnuPG 1.0.1, in order to be fully compatable with today's keys, as well as take advantage of the new features that these products offer.
> >From my readings on GnuPG and OpenPGP, I am guessing the answer to
> all the above questions is yes. However, it seems bizarre to me that
> nowhere in my reading did I find a statement similar to, "GnuPG is
> completely compatible with PGP 5.x." If this is the case, I think
> this should be the first piece of information in any GnuPG
> documentation.
The reason is mainly the v3 vs. v4 key types. Note that PGP5 is not OpenPGP compliant.
> Am I missing something?
> --
> Trevor Smith |
> PGP public key available at:
> PGP Public Key Fingerprint= A68C C4EC C163 5C0A 6CFA 671F 05D4 0B30 318B AFD6
__ L. Sassaman System Administrator | "All of the chaos Technology Consultant | Makes perfect sense..." icq.. 10735603 | pgp.. finger:// | --Joe Diffie -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.1c (GNU/Linux) Comment: OpenPGP Encrypted Email Preferred. iD8DBQE40Y+BPYrxsgmsCmoRAkOTAJ9aennZbE2tlkKpsGqkA5VhpsBdbgCgpNvJ u6i4g7/ObyM9GkmVakaF4/I= =ASL0 -----END PGP SIGNATURE-----