Are you a computer? If you've ever successfully filled in a CAPTCHA on the Web, you're probably not. So what is this test, and what does it do? See more »

Security passcards are often used to gain entry into areas and buildings with restricted access. Find out what data is kept on an encoded security passcard and how they work. See more »

The growth of the Internet has excited businesses and consumers alike with its promise of changing the way we live and work. But doing business online means there's a whole lot of information that we don't want other people to see. That's where encry See more »

Your fingerprints are not only unique; they're also very hard to fake and even harder to misplace. What better ID to use in a security system? Learn how fingerprint scanners know it's you. See more »

Biometrics provide a unique method of security that's virtually foolproof. Just scan a fingerprint or your retina and you're in. But what could happen if your personal information were stolen? See more »

Digital signatures make sure the documents you send electronically are authentic. Learn about digital signatures and other authentication methods. See more »

A smart card may look like a credit card, but just like people, it's what's inside that counts. Find out how smart cards protect sensitive data. See more »