How to open the box? - Thinkingames
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How to open the box?
Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached and you have several locks with keys. However, your friend does not have the key to any lock that you have. How do you send the valuable object, locked, to your friend - so it may be opened by him?
Send the box with a lock attached and locked. Your friend attaches his own lock and sends the box back to you. You remove your lock and send it back to your friend. He may then remove the lock he put on and open the box.
How to open the box?
Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached and you have several locks with keys. However, your friend does not have the key to any lock that you have. How do you send the valuable object, locked, to your friend - so it may be opened by him?
Send the box with a lock attached and locked. Your friend attaches his own lock and sends the box back to you. You remove your lock and send it back to your friend. He may then remove the lock he put on and open the box.
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