Computer User Authentication

Authentication is the action of identifying your digital identity. Get educated on passwords, encryption keys, facial recognition and fingerprint scanners.

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You've probably used two-step verification for secure logins, but is that SMS code really keeping your information safe?

By Jongkil Jay Jeong, Ashish Nanda & Syed Wajid Ali Shah

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?

By Jonathan Strickland

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?

By Jonathan Strickland


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

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.

By Tom Harris

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.

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

By Jeff Tyson


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.