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    So, we went away from using passwords as they’re insecure and people stored them in insecure ways. We told people to never write down their password and never ever keep them on post-its next to their monitor. Now we use private keys instead as it’s more secure and they’re a lot bigger. Until someone came up with the brilliant idea to print their private keys as a QR code and put it on a post-it next to his/her monitor.