PGP Interactions Page

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Note to all users

This page is no longer updated, since the original purpose of the page has been nullified by more recent versions of PGP and GnuPG. I'll keep it up as a reference, but I don't have much interest in updating it. Thank you for visiting my site, and thanks to everyone who contributed - a HUGE list.

PGP & Mail Clients

Trying to get started with PGP? Trying to get a friend started with PGP? Switching e-mail clients? Then check out this page to find out about the various PGP plugins available for many different e-mail clients! This is an extensive list, but there are always e-mail clients and plugins we don't know about. (9/26/06 - this list is severely out of date, I know. I'm not interested in maintaining it, especially since I didn't write it in the first place.)

PGP-Basics Forum

New to PGP? Having some trouble understanding how to use PGP? Want some practice signing messages? Join the PGP-Basics forum, hosted by

Current Versions (out of date):


(5/6/2003) GnuPG has released GnuPG 1.2.2.

(12/7/2002) PGP has released PGP 8.0. Sweet!

(10/27/2002) A bugfix release of GnuPG is available.

(10/3/2002) Okay, it's been a really long time. I'm finding that the main purpose of this page (clearing up confusion between version 5 and version 2.x compatibilities) has definitely decreased in importance, so I'm lax about updating it. Anyway, we have the newly formed PGP Corporation talking about releasing PGP Corporate Security 8.0. The folks over at GnuPG haven't been idle, either, with their recent release of GnuPG 1.2.0.

(5/3/2002) Long time no update. Sorry about that, other projects have been keeping me busy, plus there hasn't been many new version of PGP/GPG released. Anyway, GnuPG 1.0.7 is now available and it supports RSA key generation! This is especially good to hear since NAI may not be producing new versions of PGP.

I've been getting a lot of e-mail regarding PGP and Windows XP. I'm not a good person to ask since I don't use Windows XP, but here is a link to a FAQ on the issue: Tom McCune's PGP Questions and Answers.

This page is dedicated to demonstrating which versions of PGP will handle RSA, DH, or both types of keys.

Any additions, subtractions, or corrections should be e-mailed to Thank you! For encrypted messages, here are my DSS/DH key block and RSA key block.


  1. PGP 1.0
  2. PGP 2.x
  3. PGP 4
  4. PGP 4.5
  5. PGP 5.0
  6. PGP 5.0i
  7. PGP 5.5/PGP 5.5i
  8. PGP 6.0
  9. PGP 6.5
  10. PGP 6.5.1 & PGP Command Line
  11. PGP 6.5.2 & PGP 6.5.2a
  12. PGP 7
  13. PGP 7.1
  14. PGP 8.0
  15. GnuPG 1.0.0-1.0.7
  16. GnuPG 1.2.0
  17. Chart summarizing PGP versions
  18. Links to related sites
  19. Sources

PGP and e-mail software


This chart contains a summary of the information on the other pages. Any errors should be noted to

Click on the name of the product to see the corresponding text.

**These versions cannot be exported from the US or Canada, due to export restrictions of strong encryption. In theory.

Product Uses RSA
RSA Keys
Uses DH
DH Keys
Source Notes
** PGP 1.0 YesYesNoNo PPGSDOS & SunOS only
** PGP 2.0
YesYesNoNo PPGS or Viacrypt
** PGP 2.5 YesYesNoNo PPGSIncompatible with older versions
** PGP 2.6.x YesYesNoNo PPGSVery popular, even today
** PGP 2.6.3g YesYesNoNo 4096 RSA keys
PGP 2.6.3ig YesYesNoNo Noel Bell4096 RSA keys
PGP 2.6.3uin YesYesNoNo Georg Bauer8192 RSA keys
PGP 2.6.3CKT YesYesNoNo Cyber-Knights Templarlarge key sizes
PGP 2.6.3ia-multi03-multi06 YesYesNoNo UnknownFree of patented algorithms
** PGP 2.6.4 YesYesNoNo PPGSWon't crash when DSS/DH keys are used
PGP 2.6xui YesYesNoNo See site
** PGP 4.0 YesYesNoNo ViacryptSee text
** PGP 4.5 YesYesNoNo
** PGP 5.0 MIT YesNoYesYes MIT
** PGP 5.0 YesYesYesYes PGPCommercial version
** PGP 5.0 Eudora
NoNoYesYes Eudora
** PGP 5.0 Eudora
YesNoYesYes PGP Up to 5.5.3 supports
RSA keys
PGP 5.0i YesYesYesYes PGPi
** PGP 5.5 Freeware NoNoYesYes PGP
** PGP 5.5 YesYesYesYes PGP Business Security
** PGP 5.5.3 Freeware
and Bundleware
NoNoYesYes PGP
** PGP 5.5.3 Eudora
YesNoYesYes PGP
PGP 5.5.3i YesYesYesYes PGPi
** PGP 5.5.3a (PW) YesYesYesYes P. Wilson Fixes Bug, Easy to use
PGP 5.5.3iCKT YesYesYesYes Cyber-Knights
8192 RSA Keys
PGP 5.5.3iCKT
6/22/98 build
YesYesYesYes Cyber-Knights
Brawny key sizes
PGP 5.5.3iaLP YesYesYesYes LP8192 RSA Keys
PGP 5.5.3fr YesYesYesYes UnknownSee text
** PGP for Personal Privacy 5.5.5 YesNoYesYes NAISame as 5.5.3
** PGP for E-mail and Files 5.5.5 YesYesYesYes NAISame as 5.5.3 Business Security
** PGP Desktop Security, Personal Privacy, and Freeware 6.0.0 DH NoNoYesYes NAI
** PGP Desktop Security 6.0.0 RSA Add-on YesYesYesYes NAI
** PGP Personal Privacy 6.0.0 RSA Add-on YesYesYesYes NAI
** PGP Personal Privacy 6.0.0a DH YesNoYesYes NAI
** PGP Desktop Security 6.0.1 RSA Add-on YesYesYesYes NAI
** PGP Personal Privacy 6.0.1 RSA Add-on YesNoYesYes NAI
** PGP Desktop Security, Personal Privacy, and Freeware 6.0.2 DH MaybeNoYesYes NAIUses CAPI, see text
** PGP Desktop Security and Personal Privacy 6.0.2 RSA Add-on YesYesYesYes NAI
PGP 6.0.2i YesNoYesYes PGPi
PGP 6.0.2iCKT YesYesYesYes Cyber-Knights Templar Build 03 and above has PGPdisk
** PGP Desktop Security 6.5 YesNoYesYes NAIRSA Add-on available
** PGP 6.5.1 & PGP Command Line YesYesYesYes NAI
PGP 6.5.1int/PGP 6.5.1ifr YesYesYesYes PGPi/Fabien Petitcolas
** PGP 6.5.2 & PGP 6.5.2a YesYesYesYes NAI
** PGP Command Line 6.5.2/PGP E-Business Server YesYesYesYes NAI
PGP 6.5.3 YesYesYesYes NAIExportable from USA
PGP 6.5.8 YesYesYesYes NAIExportable from USA
PGP 7.0-7.0.3 YesYesYesYes PGP, Inc.Exportable
PGP 7.1 YesYesYesYes PGP, Inc.Exportable
GPG 1.0.0-1.0.2 Yes *NoYesYes GnuPG* RSA & IDEA Plugins Required
GPG 1.0.3-1.0.6 Yes *NoYesYes GnuPG* IDEA Plugin Required
GPG 1.0.7 YesYesYesYes GnuPG* IDEA Plugin Required
GPG 1.2.0 - 1.2.1 YesYesYesYes GnuPG* IDEA Plugin Required
Product Uses
RSA Keys
DH Keys
Source Notes
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These sites contain other information about PGP.
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Errors in this page are almost definitely mine; I never realized how complicated this was until people started feeding me info! In fact, there was so much info contributed by everyone that I stopped listing what each person sent me, since it was getting too long. These people (mostly from the PGP-Users mailing list) contributed the information:

Jack Repenning Mark Rainer Merz
Alasdair Lindsay Richard Conyngham Greene Curt Clark
Noah Salzman Todd Janto F Dreijer
Justin Cave David Kelvin Roland E. Lipovits
Sidney Skinner Imad R. Faiad David Crick
M. Zadnik Johan Wevers Andrea Ungaro
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Written by RJ Marquette on 12/10/97. Version 2.1.4 4/21/2001.
Copyright © 2000 RJ Marquette.