"You got it?" I said, once we were both seated and nursing hot chocolates. I got caffeinated marshmallows; he got Thai ghost pepper-flavored -- though that was mostly marketing, no way those marshmallows were over a couple thousand Scovilles.
"I encrypted it with your public key," he said, handing me a folded up paper. I unfolded it and saw that it had been printed with a stegoed QR code, hidden in a Victorian woodcut.
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