In the physical realm, we have the physical analog which is simply locks and keys. And the idea that a universal key that would be use only by the the good guys and only for emergencies is one that will still find supporters. Those supporters are fucking idiots.
Want to know why people who want to give government universal keys to everything for “just in case” are fucking idiots? Here’s why.
TSA approved keys to TSA approved locks, available to anyone for the taking: https://theintercept.com/2015/09/17/tsa-doesnt-really-care-luggage-locks-hacked/
New York City “master key” available for all to dublicate: http://nypost.com/2015/09/20/the-8-key-that-can-open-new-york-city-to-terrorists/
Now if that doesn’t explain why the FBI directors call for an “encryption backdoor” raises red flags for the people who are paying attention. To refresh your memory, this is the same FBI that has had their director publicly lobby to defeat encryption: http://www.nytimes.com/2015/11/19/us/politics/fbi-director-repeats-call-that-ability-to-read-encrypted-messages-is-crucial.html and the same FBI that tried to do an end run around Congress to force Apple to provide a hacking tool to break the encryption on iPhones: http://bgr.com/2016/02/26/apple-fbi-iphone-hack-backdoor/
What does this mean to you? Well, the Social Security number was never intended to be used for identification, and the Patriot Act was only supposed to be used against terrorists. But now the SS number is identification and the Patriot Act is used to prosecute drug crimes. http://www.motherjones.com/kevin-drum/2014/10/patriot-act-warrants-used-more-drugs-terrorism
The lesson is clear, the government cannot be trusted to keep a “special” tool in reserve for “extraordinary situations” because it is just too easy for the government to make everything an exception to the rule. If anyone would like to argue that we can trust the government to exercise restraint, please feel free as the comment section is open.