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FIDO Passkeys

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FIDO Passkeys

Summary

Passkeys are a modern, phishing-resistant way to log in without passwords. Instead of typing a password, your device verifies you (via Face ID, fingerprint, or PIN) and then proves your identity to the website cryptographically. Passkeys work on iPhone, Android, Windows, and Mac—and they sync securely across all your devices.

How Passkeys Work

  1. Setup: When you sign up for a service, your device creates a pair of cryptographic keys—a public key (registered with the website) and a private key (stored securely on your device).
  2. Login: When you sign in later, the website sends your device a challenge. Your device signs it with the private key after you verify with Face ID, fingerprint, or PIN.
  3. Verification: The website checks the signature against the public key. If it matches, you’re in. No password is ever sent or stored.

Why Passkeys Are Better Than Passwords

  • No phishing: A passkey created for your bank’s website won’t work if you’re lured to a fake copy—the cryptographic binding to the domain makes this impossible.
  • No password fatigue: You don’t need to remember or type anything. Just use your phone’s Face ID or fingerprint.
  • No resets: Forgotten passwords and “reset my password” emails become a thing of the past.
  • Cross-device: Sign in to your laptop using the passkey stored on your phone—even if you just bought a new phone, passkeys transfer automatically.

How to Get Started

  1. Use passkeys when offered: Most modern services (Microsoft, Google, Apple, banks, retailers) now offer “Sign in with passkey” as an option. Try it next time you create an account.
  2. Keep your phone secure: Your phone IS your password now. Use a strong device PIN (6+ digits) or biometric authentication.
  3. Fall back to passwords: If a service doesn’t support passkeys yet, use a password manager with a unique, random password instead.

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