What are security keys?
Security keys are physical devices, often in the form of USB, near-field communication (NFC), or Bluetooth tokens, that act as a strong authentication factor for online accounts and services. Instead of relying on passwords alone, a security key uses cryptography — a public and private key pair — to verify a user’s identity, making it one of the most secure methods of multi-factor authentication (MFA).
Why are security keys more secure than traditional methods?
Passwords can be stolen through phishing, keylogging, or data breaches, and even one-time passwords (OTPs) are vulnerable to interception via social engineering or SIM-swap attacks. Security keys mitigate these risks by requiring possession of a physical device that stores cryptographic credentials. Authentication happens locally between the key and the service provider, preventing sensitive data from being exposed or reused.
How are security keys used in practice?
When logging in to a protected service, a user inserts or taps their security key, which verifies their identity through a cryptographic challenge. Many modern implementations, such as FIDO2 and WebAuthn, also support passwordless authentication, where the security key itself replaces the need for a traditional password.
Example
A banking customer logging into their online portal is prompted to authenticate. Instead of entering an SMS OTP, they insert their USB security key into their laptop. The system instantly verifies their identity, protecting them from phishing and other common fraud attacks that static authentication measures often fail to block.
Additional resources:
Keywords:
Security keys | MFA | Passwordless authentication
Security keys are physical devices, often in the form of USB, near-field communication (NFC), or Bluetooth tokens, that act as a strong authentication factor for online accounts and services. Instead of relying on passwords alone, a security key uses cryptography — a public and private key pair — to verify a user’s identity, making it one of the most secure methods of multi-factor authentication (MFA).
Why are security keys more secure than traditional methods?
Passwords can be stolen through phishing, keylogging, or data breaches, and even one-time passwords (OTPs) are vulnerable to interception via social engineering or SIM-swap attacks. Security keys mitigate these risks by requiring possession of a physical device that stores cryptographic credentials. Authentication happens locally between the key and the service provider, preventing sensitive data from being exposed or reused.
How are security keys used in practice?
When logging in to a protected service, a user inserts or taps their security key, which verifies their identity through a cryptographic challenge. Many modern implementations, such as FIDO2 and WebAuthn, also support passwordless authentication, where the security key itself replaces the need for a traditional password.
Example
A banking customer logging into their online portal is prompted to authenticate. Instead of entering an SMS OTP, they insert their USB security key into their laptop. The system instantly verifies their identity, protecting them from phishing and other common fraud attacks that static authentication measures often fail to block.
Additional resources:
- Use case deep dive: Passwordless authentication
Keywords:
Security keys | MFA | Passwordless authentication
