Multi-factor authentication is a technique that uses more than one authentication method to increase security. The most commonly used factors are:
- Something you know: username and password
- Something you have: token, smart card, etc.
- Something you are: biometrics (fingerprint or retinal scanners)
These solutions are usually used in high-security environments and can be expensive, as it may involve providing hardware tokens to every user and installing biometric equipment in the organization. If the requirements are not very high, you can also use software tokens that can be installed on mobile . . .
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