Two-factor authentication is a strong authentication method where the user provides two types of identification. Two-factor authentication combines something you know (a PIN or a password) with something you have (a physical device, such as a YubiKey). The physical device must be capable of interacting with a computer and transmitting a unique ID. The YubiKey works with any computer that can support a USB keyboard, and can uniquely identify itself with the one-time password it generates, making it an excellent device for two-factor authentication.

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