Is two-factor authentication (2FA) as secure as it seems?

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Two-factor authentication (2FA) was invented to add an extra layer of security to the—now considered old-fashioned and insecure—simple login procedure of entering a username and password. One of the most well-known examples of 2FA is when you try to log into a familiar website from a different machine or from a different location, which results in a different IP.

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