A security key is a physical device that provides additional authentication for a user trying to access a service. It is part of multifactor authentication, which requires two or more verification factors to increase account security. Physical tokens can be various devices, such as key fobs or smart cards, but security keys are specifically designed for digital authentication, often connecting through an interface like USB, NFC, or Bluetooth, without revealing what interface a security key uses.
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What are common types of security keys used in multifactor authentication?
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How does multifactor authentication enhance security compared to single-factor authentication?
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What are the potential vulnerabilities or weaknesses of using security keys?