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Box, Locks and Keys (Posted on 2003-07-18) Difficulty: 4 of 5
You want to send a valuable object to a friend securely. You have a box which can be fitted with multiple locks, and you have several locks and their corresponding keys. However, your friend does not have any keys to your locks, and if you send a key in an unlocked box, the key could be copied en route.

How can you send the object securely?

See The Solution Submitted by Ravi Raja    
Rating: 3.4167 (12 votes)

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re: Possible Solution | Comment 5 of 19 |
(In reply to Possible Solution by DJ)

Yes, this is not only the traditional answer, but the "key" to secure encryption of electronic documents. Since each of you choose an encryption code key that you share with no one else, no one can decrypt any of the three encrypted versions (your encryption, bothe encryptions, your friend's encryption.)
  Posted by TomM on 2003-07-18 19:39:45

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