Pb decrypting with PGP 6.5.3 and GnuPG

Mr Griffon griffon9@hotmail.com
Mon, 28 Aug 2000 09:57:39 GMT

Well my goal was not so much to use PGP but to provide a GUI to decode GnuPG 
messages under Windows. So far GPA is Unix only, and GnuPG for Windows is 
command-line only. I did a little app with Delphi to help my users, but they 
still have to type their password under a command line every time they need 
to decode something, which is not good when you do that 100 times a day :(

I know GnuPG has a way to automate decoding with the option passphrase-fd 
but that seems to be only for Unix. So far I quite don't see how to automate 
under Windows (but if someone knows, I'd be cool because making a win32 GUI 
for GnuPG would be really easy and quick with Delphi !)

>PGP does not understand the Blowfish cipher algorithm but die to the
>fact that you created the key with GnuPG, this key indicates GnuPG that
>your decryption software understands Blowfish.
>Blowfish used to be in the first PGP 5 version which I used for
>interoperabilty testing - later versions of PGP removed Blowfish.
>However Blowfish is a legal OpenPGP algorithm. Due to these problems
>I am going to change the preferences to use CAST5 in favor of Blowfish.
>Neither GnuPG nor PGP has currently a simple way to chnage the
>preferences. With GnuPG is is possible but you need to know a little
>bit aboput programming: Edit the file g10/keygen.c, function
>keygen_add_std_prefs() and change the sequence of algorithms given there
>to have CAST5 come before Blowfish:
> Original:
> buf[2] = CIPHER_ALGO_CAST5;
> After your modification:
> buf[0] = CIPHER_ALGO_CAST5;
>then use gpg's edit menu and for example use "expire" to recreate your
>self-signature. In General it is not a good idea to chnage
>implementaions after creating the key; the preferences mechanism
>assumes that you use the same implementations. Negotiating parameters
>in am email system is not rwally possible and preferences are the only
>thing we can do.
>In future we are going to use Twofish and I have checked with the PGP
>creators, that we can interoperate.
>There is also a GnuPG version for Windows available.
> Werner
>Werner Koch GnuPG key: 621CC013
>OpenIT GmbH http://www.OpenIT.de
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