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.

Posts from this topic will be added to your daily email digest and your homepage feed. The Aqara U200 is a retrofit door lock with a separate keypad and a fingerprint reader. It may also be the first ...

It used to be that to get into your home, you needed a key. If you lost that key, you either had to call a locksmith (or maybe your landlord) or break into your own home. If you happened to be 10-year ...