Multifactor Authentication
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def
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proving identity using more than one distinct authentication factor
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factors
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something you know — a password, PIN, or pattern
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something you have — a smart card, USB security key, hardware/software token, or your phone (SMS code)
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something you are — biometric authentication (fingerprint, iris scan, voice print); usually stores a mathematical representation rather than the raw biometric; difficult to change if compromised
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somewhere you are — location-based factors, e.g. IP address or GPS/mobile location services (imperfect, but adds signal)
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related
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