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Question
Andy and Patrick are staying in different rooms in the same hotel. Andy needs to give a gold pendant to Patrick, but spies are trying to assassinate Andy and Patrick so neither of them can leave their room. The only way they can transfer objects is by using the bellhops. Both Andy and Patrick have a safe with a large clasp that can be secured with a padlock. Both Andy and Patrick have a padlock and a corresponding key. (So 1 gold pendant, 2 safes, 2 padlocks, and 2 keys.) But the bellhops are thieves. Anything that is not padlocked in the safe will be stolen by the bellhops - including any unlocked padlocks, the keys or the pendant. How can Andy transfer the gold pendant to Patrick without it being stolen? (where both sides have encryption capability, and where unsecured items are taken away rather than just copied?)
Good Luck!
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