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?

I was disappointed with the answer which introduces new facts of the friend having locks of his own. An equally valid answer would have been to use a security delivery service. The question becomes one of imagination rather than the logical evaluation of the given facts.

But I enjoyed tackling the question albeit I failed to solve it.

Posted by nellie on 2003-07-27 07:08:11