siliconhell

I will pay 20 tokens to the person who posts the first correct reply to this

You want to send a valuable object to a friend. You have a box which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than large enough to have a lock attached. But your friend does not have the key to any lock that you have. How do you do it? Note that you cannot send a key in an unlocked box, since it might be copied


The answer uses a similiar technique to many of today public/private encryption techniques.