<ul><li>Two-Factor Authentication (2FA) is an essential security measure that requires users to provide two different authentication factors to verify themselves.</li><li>Implementing 2FA can drastically reduce the risk of unauthorized access, even if one authentication factor is compromised.</li><li>Authentication factors can be categorized into three main types: Knowledge factors, Possession factors, and Inherence factors.</li><li>In a typical 2FA setup, the user enters their username and password, and then provides a second factor, such as a code generated by a smartphone app or a hardware token.</li></ul>

Securing Linux Systems with Two-Factor Authentication

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