Tempest (codename)

Tempest is the codename for a set of tests and standards used to make sure that electronic devices don't leak secret information through sound, light, and other forms of energy. It's like a game: people put a secret number inside a device, and the challenge is to make sure that number cannot be figured out through sound, light, or any other energy. If the number gets out, then the device has failed the test. Tempest helps make sure that devices are secure, so your information stays safe.