When I use my phone to pay for things in a shop, there's surely a lot of complicated security going on, and a bit of ugly technology is even exposed when it dis

When I use my phone to pay for things in a shop, there's surely a lot of complicated security going on, and a bit of ugly technology is even exposed when it displays a QR code for the cashier to scan. But nowhere ever did it ask me any questions that required me to learn any weird technical concepts. I never had to choose a number of bits or know anything about what a "key" is. As soon as a user sees these things, they have to either make a random guess or go off for hours teaching themselves what it means. It's a complete fail. The words "PGP/MIME" should never appear on a PGP email plugin! When you send a regular file attachment, you don't have to specify the MIME type. It's all silent and hidden.