I must have left keys to the various places I’ve worked and lived all over the world. You give a key to a friend, or a tradespersons, they may make copies, you forget, it’s a personal security nightmare. But changing locks is sure to keep locksmiths in business.

What about this. A lock that opens with a scanner, reading a key pattern that you can change via wireless. You could setup keys that only work for certain time spans, and even send key images via encrypted email.

Contributed by Rob Smith