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What you are looking for is an Additional Decryption Key (ADK).Quote:> Is it possible for me to create a private key that only I can use
> to sign messages, but that I and another individual can use to
> decrypt messages?
ADK's support non-repudiation, but the presence of an ADK on your
*personal* key means that the owner of the ADK can decrypt your
inbound messages, and, if you always encrypt to your own key, your
outbound messages as well. If I remember correctly, PGP will warn a
user if it sees an ADK on someone's public key before it encrypts to
that public key, which means that people who encrypt to you will see
that their message may be read by someone else.
ADK's are mentioned in the PGP User's Guides, but documented only in
the PGP Administrator's Guide; the 7.x and 8.x PGP software requires
the "enterprise" level to get the PGP admin program. I don't know if
the 6.5.x versions support ADK or not. I don't know if GnuPG
supports ADK's or not.
Here is a google-found link to a .ru domain copy of the PGP admin
guide for 8.0 (not 8.0.2):
That .pdf matches my own copy of the documentation on my own hard
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> Is it possible for me to create a private key that only I can use to sign
> messages, but that I and another individual can use to decrypt messages?
Of course, this would require all correspondents to have both
public keys and to use them appropriately. This could be
indicated in the user IDs.
David E. Ross
Concerned about someone snooping into your E-mail?
Use PGP. See my <http://www.rossde.com/PGP/>
For those using CodeWarrior with the STL portion of the C++ Standard
Library, I have released a CodeWarrior-specific version of my
STL Error Decryptor Freeware. This Perl-based tool post-processes
error diagnostics to reduce the hairy template-expanded data types
to more closely resemble their user source code origins.
Recent enhancements include compatibility with CodeWarrior 8 under
both Windows and Unix/OS X. The download site is:
The tool is currently works only with the command-line tools, but
helper scripts are provided for use under both Windows and Unix.
I'd be happy to assist Metrowerks in building IDE support for Error
Decryption into their graphical development tools, but I suspect they'd
need to see some interest from their users before blessing such a
project. So, if you'd like to see built-in STL Error Decryption in a
future CodeWarrior IDE, make some noise...