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

How will biometrics affect our privacy?

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?

'Security Selfies' May Make Passwords Obsolete

How could selfies replace passwords as a security feature? Learn more about selfies and facial recognition tech in this HowStuffWorks Now article. See more »

How will biometrics affect our privacy?

Will biometrics and privacy issues bump heads? Even though biometrics provides virtually foolproof security, will biometric privacy issues be a concern? See more »


CAPTCHA is a security test given to prevent computers from filling out forms on the Internet. Learn more about How CAPTCHA Works. See more »

What is a digital signature?

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

How Fingerprint Scanners Work

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 »

How does a security passcard work?

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

How Encryption Works

How secure is the Internet for sending sensitive information? Learn all about encryption, authentication, hash algorithms and more. See more »

What is a smart card?

What is a "smart card"? Learn how an embedded microprocessor in a smart card can authenticate your computer usage and data. Learn about smart cards. See more »