For thousands of years, if you wanted to send a secret message, there was basically one way to do it. You’d scramble the message using a special rule, known only to you and your intended audience.

For the past two weeks, I’ve been unlocking my front door without ever touching a keypad, fingerprint reader, smartphone, or physical key, thanks to a new smart lock. It’s the first lock I’ve ...

My sister got locked out of her house for the third time in six months last spring. She called from her porch, frustrated and embarrassed, waiting for a locksmith to charge $200 for ten minutes of ...