Locksmithing: A 3D-printed key that can’t be copied | The Economist

KEYS have been around for a long time. The earliest, made from wood, date back to the ancient Egyptians. The Romans improved them by making them from metal. But there, more or less, they have stayed.

A key is still, basically, a piece of metal sporting a series of grooves, teeth and indentations which, when inserted into a keyway, line up to move pins and levers to lock or unlock a mechanism.

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