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this clothesline in Long Island New York  was the U.S government's first ever system   for transmitting top secret data it was the  Revolutionary War and the Americans needed   a way to get information from New York City to  George Washington's headquarters in Morristown   New Jersey without the British intercepting it  so they wrote down 763 words assigned each a   number between 1 and 763 and bada bing bada boom  you've got the worst Cipher in military history   but whatever people's brains were too riddled with  dysentery or something and somehow this seemed to   do the trick these encrypted letters would travel  along this route from New York City to here in   Setauket where they would be stashed in one of  five locations a local woman and a strong would   then hang up a black Petticoat on her clothesline  to signal to nearby ships that the letter was   ready to be picked up with between one and five  white handkerchiefs to indicate which location   the letter was hidden in from there the letter  would then be secretly picked up and make the   rest of the journey to Morristown unfortunately  we're no longer allowed to distribute information   about British warships and the US Department  of Defense has since updated its methods for   securely transmitting government secrets today the  US uses three different networks each designed for   different levels of classification to send  sensitive data across the globe here's how   they work the first and least secure of the three  is called necromant the non-classified Internet   Protocol router Network basically nevernet is  a private interconnected network of government   computers that is attached through secure gateways  to the rest of the internet technically you could   access it using the same connection you're using  to watch this video but you probably wouldn't get   very far think of it like a gated community they  might be connected to the wider system of roads   but if you go there without the right credentials  you'll wind up in prison or shot you can't access   never Nets unless you're part of a government  agency or approved government contractor that's   giving you access but it's used pretty widely and  isn't monitored too closely none of the data on   nippernet is technically classified it's just  stuff that the government doesn't want floating   around in public data like tax records internal  schedules or these photos of paddle boarding   for data that's actually classified and not  just too titillating for public consumption   the Department of Defense uses a network  called sipper net or with a secure Internet   Protocol router Network this is the network that  deals with any information that's been labeled   confidential or secret the first two levels of DOD  classification examples of confidential or secret   information might be say lists of War reserves  scientific studies relevant to military Tech   information about enemy weaknesses this video of  two U.S Apache helicopters firing on civilians   that got leaked when supernet was compromised in  2010. oh whoops how did that get in there...