**What is an MFA device?**
MFA devices are physical or virtual tools used to generate one-time passwords (OTPs) for Multi-Factor Authentication (MFA). These devices add an extra layer of security to the authentication process by requiring users to provide a temporary code along with their regular username and password.
1. **Authenticator App**: An authenticator app is a software application installed on a mobile device that generates one-time passwords (OTPs) for Multi-Factor Authentication (MFA). These OTPs are typically time-based and change periodically, providing an additional layer of security beyond just a username and password during the login process.
2. **Security Key**: A security key is a physical device used for Multi-Factor Authentication (MFA) authentication. It is often in the form of a USB device or a Bluetooth-enabled token. Security keys use public-key cryptography to authenticate users, offering a highly secure method for access control, especially for services and applications where strong security is essential.
3. **Hardware TOTP Token**: A hardware TOTP (Time-Based One-Time Password) token is a physical device that generates OTPs based on the TOTP algorithm. TOTP tokens typically have a small screen that displays the current OTP, and they synchronize their internal clocks with a server to ensure that the OTPs are valid within a specific time window.