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Security Fundamentals & Crypto · Intermediate

Passkey

FIDO2 discoverable credential that replaces passwords, either synced across devices or bound to one device.

Definition

Passkeys store a private key on the user's device or in a synced credential manager such as iCloud Keychain, Google Password Manager, or a third-party manager. Sign-in requires the user to unlock the device with a biometric or PIN. Device-bound passkeys on security keys offer higher assurance for regulated environments.

Example

A user signs in to a retail site by approving a Face ID prompt for the saved passkey.

Exam tip

Passkeys are phishing-resistant; synced passkeys trade some assurance for recoverability.

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