Bob Fehrenbach wrote:

>  PGP (Pretty Good Privacy) is readily available.  In addition to its
> public key encryption it will do conventional encryption.

  I understand it is more correct to say that it will do Public Key
Encryption in addition to "conventional".  Apparently it performs PKE
not on the target file, but on a symmetric encryption key used to
encrypt the target file, then sends the "conventionally" encrypted file
plus the PKE-encrypted "conventional" key.  Why?  The PKE is very slow.

>  And it's free!

  Now that's the best point!

  Cheers,
        Paul B.