Can't Stop the Encryption
You don't need a computer to do encryption; using computers is merely faster and easier.
I mean you could literally sit down with a copy of the AES specification, an ASCII or Unicode chart, a pencil and some paper and manually encrypt or decrypt any message you wanted as long as you had the appropriate keys and an understanding of the math. I don't know how long it would take, but you could do it.
You can force them to use an unencrypted protocol but you can't force them to send plaintext.
Biting the hand that feeds IT
