1. # a very handy HowTo wrt gpg: http://www.aplawrence.com/Basics/gpg.html
  2. # a very handy HowTo wrt gpg can be found at http://www.aplawrence.com/Basics/gpg.html, and its reference manual at http://www.gnupg.org/gph/en/manual.html
  3. # encrypt a file with the encryption algorithm IDEA using a passphrase: 
     pgp -c plaintext -o ciphertext.pgp
  4. # decrypt a file with the encryption algorithm IDEA using a passphrase: 
     pgp -d ciphertext.pgp