They help me find typing errors or any other problems. I told Maple N's value. My mouse technique isn't perfect. And I now told it Charlie's public key. I tend to use long identifying names for variables in situations like this.
Confusion is too easy.
Deborah's public and private keys. This is Charlie's encryption of TOAD using Deborah's public key. Charlie sends this number to Deborah. We get back 20150104, TOAD again. You can practice with various messages until you feel comfortable with this method.