What is Two-Factor Authentication?

It is an authentication process where two of three recognized factors are used to identify a user: Something you know - usually a password, passcode, passphrase or PIN. Something you have - a cryptographic smartcard or token, a chip enabled bank card or an RSA SecurID-style token with rotating digits Something you are - fingerprints, iris patterns, voice prints, or similar

Taxonomy of Computer Security

Computer security is frequently associated with three core areas, which can be conveniently summarized by the acronym “CIA” standing for Confidentiality — Ensuring that information is not accessed by unauthorized persons; Integrity — Ensuring that information is not altered by unauthorized persons in a way that is not detectable by authorized users; Authentication — Ensuring that users are the persons they claim to be.