GnuPG and PGP 5.0 compatibility problem

[vedaal at hush.com]

>Message: 6
>Date: Fri, 13 Jul 2007 22:42:37 +0200
>From: Stefan Oltmanns <stefan-oltmanns at gmx.net>
>Subject: GnuPG and PGP 5.0 compatibility problem

>I got a problem with GnuPG and PGP 5.0:
>Also PGP 5 accepts my key, it is not possible for PGP 5 to encrypt 
>with 
>my key. It?s not even displayed in the selection dialog when I try 
>to 
>encrypt something (it shows identities correct in key list (but 
>expiration not)).
>
>I read in the FAQ that PGP 5.0 does not accept ElGamal keys of 
>type 20, 
>but my key doesn?t seem to be of that type (--list-packets says 
>"version 
>4, algo 16, created 1153340019, expires 0")
____^^^^^^^^

what is algo 16?

standard current open pgp algorithms go up to algo 10 (twofish)
for cipher algorithms, and algo 11 (sha224) for hash algorithms

>There seem to be another problem, do you have any idea how to 
>solve it?

just in case the algo '16' was a typo,
maybe consider the following:

am assuming the key was generated under the gnupg default settings,
which would mean it would use cast5 as the cipher algo, which 'is' 
compatible with pgp 5

*but*

the default setting for gnupg is to use the newer secret key 
protection,
which is not compatible with any (standard) pgp version before 8

try:
[1] delete the key from pgp 5
[2] remove the passphrase from the key in gnupg
[3] re-import the key into pgp5, and set the passphrase in pgp5
[4] re-set the passphrase in gnupg

and see if that works

also,
pgp5 accepts rsa keys only up to 2048
so if your key is a bigger rsa key, that is another reason why it 
won't work


vedaal

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