I have to get this truck back and get back to Cindy and the boys." Thanks for the help. We really appreciate it." Anytime," Dave replied. Very quietly I heard him add, "I just hope that Liz will be better to you than my sister was." I expect that she will be Dave. Thanks."Dave had a sister and she was with Dad? Now I was confused. I knew that I had to milk the cows soon, but I needed to talk to someone. I quickly followed Dave outside. Dad had stayed inside to help Liz, which gave me my opening."Dave" How can I help you Rich?" By explaining why you never told me that it should be 'Uncle' Dave." What are you talking about?" I heard you in there talking to Dad. The only other girl who could have been your sister would have been Mom." You are becoming a very perceptive young man." Thanks, I think. Have you heard from her?" You would like to meet her don't you?" A little. I just found out what happened a few days ago. I can almost see why you would have kept it a secret. Is she out yet?". Mattie laughed, “We wrote in code, so nobody else could have read it.”“Code?”“Paige’s idea. Before they left in ‘94, she talked to the dad of a friend who taught her how to use a columnar transposition substitution cipher. That’s how we wrote anything secret. But neither her parents or mine opened our letters, so it didn’t really matter.”“Hang on!” I objected. “A twelve-year-old and a fifteen-year-old used cryptography to communicate?”“Sure! And we even changed the key in every message.”I started laughing, “Just wow! How did you pick a key?”“It was always a combination of the two longest words in the plaintext part of the message, removing any repeated characters. It was easier for me, because I used a computer; she had to do hers by hand.”I shook my head in awe, “That’s pretty amazing. It wouldn’t stand up to brute force decryption, but you did everything right, though the key selection could have been stronger. A double transposition would have been better, and if you regularly.
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