Two-factor authentication (2FA)

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Two-factor authentication (2FA) is a security measure that requires two types of authentication: Usually in the form of something you know (e.g. a password or a PIN) and something you need to check (e.g. a physical key or a mobile device). Only together can you then log on to the system.

2FA is often used in conjunction with one-time passwords (OTP) generated by an app or software as an additional layer of security.

There are three common types of two-factor authentication methods:

  1. One-time passwords (OTP)
  2. Time-based one-time passwords (TOTP)
  3. Hardware token

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