A security key is a physical device that provides a second factor of authentication for a user accessing a service. As a "something you have" factor, it is a core component of multifactor authentication (MFA), which requires at least two verification factors to enhance account security. While physical tokens can include devices like key fobs or smart cards, modern security keys typically connect via USB, NFC, or Bluetooth and use advanced cryptographic protocols like FIDO2 to resist phishing attacks.
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How does a security key enhance security in comparison to SMS-based authentication?
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What is FIDO2 and how does it work with security keys?
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What are the different types of connections used by modern security keys?