What is authentication in general and multi-factor authentication in particular?
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Multifactor authentication (MFA) is a type of authentication that uses two or more authentication factors to assure the authenticity of an entity in a given communication. MFA may include factors such as something you know (password/passphrase, personal identification number (PIN)), something you have (cryptographic identification devices such as smartcards, tokens) or something you are (biometric characteristics likewise fingerprints, face/iris/retina scans).
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