Security Keys
Security keys are physical hardware devices used for strong authentication, typically implementing the FIDO2/WebAuthn standards to provide phishing-resistant multi-factor authentication (MFA) or passwordless login. They connect via USB, NFC, or Bluetooth and generate cryptographic keys on-device to verify user identity without exposing secrets to servers or networks. This enhances security by replacing or supplementing traditional passwords with hardware-based verification.
Developers should learn about and use security keys when building or securing applications that require high-assurance authentication, such as financial services, healthcare systems, or enterprise platforms, to protect against phishing, credential theft, and account takeover attacks. They are particularly valuable for implementing passwordless authentication flows, securing admin access, or complying with regulations like NIST guidelines, as they offer a user-friendly yet robust alternative to SMS-based or app-based MFA.