What Is a YubiKey? Understand the Hardware Security Key.

A YubiKey is a compact hardware device designed to provide an extra layer of security to online accounts. It can be used as the single authentication factor (passwordless authentication) or as a second factor in two-factor authentication (2FA), where, in addition to your password (something you know), you also need the YubiKey (something you have).

YubiKeys leverage protocols like Universal 2nd Factor (U2F), Fast Identity Online (FIDO) protocols, and public-key cryptography to enhance security. Unlike traditional 2FA methods that might use a code sent to your phone, the YubiKey is a physical token. You plug it into your device or tap it if Bluetooth- or NFC-enabled, and press the button on the key to authenticate.

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• Authentication Protocols: YubiKeys support OTP, U2F, FIDO, and public-key encryption, catering to a broad range of security needs.
• WebAuthn Compatible: As part of the FIDO2 project, YubiKeys work seamlessly with WebAuthn, allowing developers to integrate them into web applications for secure user authentication.
• Versatility: Whether it's logging into an email account or accessing a corporate database, YubiKeys provide a reliable form of user verification.

• Registration: Users first register their YubiKey with a service, creating a unique cryptographic relationship.
• Authentication: To access a service, users insert their YubiKey into their device and press the button, sending a secure login signal.

• Phishing Protection: By linking credentials to a specific website, YubiKeys prevent phishing attacks.
• User-Friendly: Offers one-touch login, simplifying the authentication process.
• Multiple Registrations: Users can register multiple YubiKeys for backup, reducing the risk of lockouts.

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• A YubiKey enhances online security by serving as a physical authentication device. It verifies the user's identity when accessing services, requiring physical presence and a simple button press.

• The choice depends on specific needs. YubiKeys offer robust, physical token-based security across various platforms. Passkeys, part of the WebAuthn framework, provide a seamless digital authentication experience. Both have unique advantages.

• No, YubiKeys don't use or store biometric data like fingerprints. They rely on cryptographic methods for user verification, activated by physical contact or Bluetooth / NFC.

• Yes, YubiKeys are designed with advanced security features. They use strong cryptographic methods to ensure that user authentication data is not vulnerable to interception or cloning. Their physical nature also adds an additional layer of security compared to purely digital methods.

• No, a YubiKey does not store passwords. Instead, it uses cryptographic keys to authenticate users. This means your actual passwords in 2FA scenarios remain confidential and are not stored on the YubiKey, enhancing security.