Passkeys, passwords, and 2FA: how they work together
Understand when passkeys replace passwords and why a second factor still matters for many accounts.
Passkeys
Passkeys use public-key cryptography. The service stores a public key while your device or password manager protects the private key. They are designed to resist phishing because authentication is tied to the legitimate website.
Passwords
Passwords remain universal and easy to transfer between systems, but users must protect them from reuse, phishing, and leaks. Unique passwords and a manager or reliable generation method reduce risk.
Two-factor authentication
A second factor adds a barrier when a password is stolen. Authenticator apps and hardware security keys are generally stronger than SMS, though SMS can still be better than no second factor.
Recovery is part of security
Store backup codes safely and keep recovery email and phone details current. Strong authentication that locks out the legitimate owner is not a complete security plan.
A practical strategy
Use passkeys where available, unique passwords elsewhere, and strong two-factor authentication for important accounts. Kardix can help generate credentials, but it does not replace the broader account-security stack.