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As their truck roared down the highway, Sophie explained to Jim that the cryptex was Da Vinci's solution to the dilemma of sending secure messages over long distances.
"We require a password," Sophie said, pointing out the dials. "A cryptex works much like a combination lock. If you align the dialls in the proper position, the lock slides open. This cryptex has five lettered dials. When you rotate them to their proper sequence, the tumblers inside align, and the entire cylinder slides apart."
"What about the inside?"
"Once the cylinder slides open, you have access to a hollow central compartment, which can hold a scroll of paper on which is the information you want to keep private."
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