encrypting received faxes before emailing

Hi:
I have a need to encrypt received faxes before emailing them.
Can anyone point me into the right direction to do this?

My initial thoughts are to monitor a 'fax received' variable and when
ascerted, I'd kick off a script tht would pick  up the received fax, run
zip (with a predefined password) and when the zip file is created, send it
to the mail program.

Any pointers would be appreciated....a pointer to if this has been done
before much more appreciated.

thanks

John