How to use a keychain as a key-chain lock, including how to unlock your car, house, or boat,

The new technology of smart keys can help lock your car or house, while also making it easier to unlock doors, a car door lock and other devices, said Richard Schreiber, vice president of research and development at the National Institute of Standards and Technology.But it is not yet a replacement for locks.To secure your keys, it's better to use an external keypad, like the one from the Apple Wat...