Topic · Keys, wallets and accounts
What is a passkey, and does it help with crypto security?
- Quick fact 1
Passkeys are a FIDO standard for signing in without a password, using a key pair stored on your device.
Source: FIDO Alliance: Passkeys
- Quick fact 2
CISA describes FIDO-based authentication as phishing-resistant MFA.
Source: CISA fact sheet: Implementing phishing-resistant MFA (Oct 2022)
- Quick fact 3
Text-message codes can be intercepted in SIM swap attacks.
The short lesson
A passkey lets you sign in to a website or app without a password. Your phone or computer keeps a private key, and the site keeps the matching public key. When you sign in, your device proves it has the key, usually after your fingerprint, face or PIN.
The big benefit is phishing resistance. A passkey is tied to the real website’s address. A fake login page cannot use it, even if you are fooled. Passwords and texted codes do not have that protection.
Where passkeys help with crypto
- Exchange and email accounts. If your exchange or email offers passkeys, they can block the most common account takeovers. Your email matters because it resets everything else.
- Replacing SMS codes. Text codes are exposed to SIM swaps.
Where they do not
A passkey protects an account login. It does not protect a self-custody wallet’s seed phrase, and it cannot stop you from approving a bad transaction. Those still need your own checks.
Next, read What is 2FA in crypto?
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Related terms
Go deeper in Lesson 9: What hurry and secrets look like
More in Keys, wallets and accounts
Common questions
Is a passkey better than an authenticator app?
For phishing, yes. CISA calls FIDO-based sign-in phishing-resistant. An authenticator app is still much better than SMS.
Can I lose a passkey?
Yes, if you lose the device and have no synced copy or backup sign-in method. Set up recovery options.
Does a passkey protect my hardware wallet?
No. It protects account logins. Your seed phrase and transaction checks are separate.
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Reviewed and sources
Written and reviewed by Joshua Baskin, founder. Last reviewed . How we check facts · Report an error
Education only. Not investment, tax or legal advice. We do not pick coins.