a multi factor authentication requires at least two sets of credentials. This is typically something you know (e. g. a password) and something you own (e. g. a token generator or mobile phone)
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How does Google detect new devices for two factor authentication
When you enable two step verification for google accounts, you get sent a code by SMS to enter in addition to your username and password the first time you log in with a new device.
How do they ...
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1answer
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NFC used in place of contact based smart card two-factor authentication
My organization is trying to move away from contact based smartcards (because our hardware vendor is no longer integrating them into their current systems) to some other form of two-factor ...
