PGP/GPG and configuration of Email client mutt to use PGP/GPG on SuSE Linux
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1) gpg --gen-key  (create key pair, defaults are ok)
   ---> ~/.gnupg/
   e.g. Stefan Dirsch <sndirsch@suse.de>

2) gpg --export --armor <username> > public_key.txt
   --> output of public key in ASCII format
   e.g. gpg --export --armor sndirsch > public_key.txt

3) cp /usr/share/doc/packages/mutt/gpg.rc ~/.gpg.rc
   Remove the string "--comment ''" for the entries
    - #create a pgp/mime encrypted attachment
    - #create a pgp/mime encrypted and signed attachment
   and likely all the other entries, if not yet done.

4) adjust ~/.muttrc:
   # gpg stuff
   source ~/.gpg.rc

5) import public keys with:
   gpg --import <filename>
   e.g.. gpg --import public_key.txt

6) Press 'p' instead of 'y' to send a message in mutt. Then chose to encrypt,
   sign oder encrypt+sign (both) the message, then press 'y' to send the 
   message.