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.

We use keys and locks all the time, but how do they work? There are many types of lock, but the most common is called a Pin Lock. Tears for boys stabbed to death in 'heinous' attack CBS News says it ...

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 ...

A healthy inventory of biometric smart locks — with or without physical keys — can improve security for customers looking for the convenience of a fingerprint sensor.