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[Music] encryption is the method of turning something thats understandable into something thats gobbly its a way of locking up information such that unless youve got the key to the lock you cant turn it back into something thats understandable again probably the best thing i just think of a padlock i take my padlock i lock my box up i keep the key and i send it off with the with with the padlock on it that actually brings about small problem though which is how do i get the key to you its almost as difficult a problem as securing the message in the first place because if someone can intercept the key or make a copy of the key then obviously they can unlock the padlock it wasnt really until diffie and hellman came up with they wrote a paper in the late 70s called directions new directions in cryptography and they said how do we stand this problem on its head how do i get that key to you in plain sight such that um you can then unlock this padlock but at the same time nobody els