Quote:
Originally Posted by baryl
That's similar to a lock riddle:
Suppose you live in a country where you don't trust the postal service. They will always open and steal contents. You have to send your friend a package with a lock on the outside but you cannot send the key. How does your friend unlock the package?
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My friend has to send me the lock first and keep the key so he allready has the key. Then i will send the content locked with the lock he send me...