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What is Two-Factor Authentication?

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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

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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.