Passkeys Explained: Going Passwordless to Beat Credential Phishing
After a month of reading how attackers steal passwords, relay MFA codes and hijack sessions, it is worth ending on some good news: there is a login that defeats nearly all of it. Passkeys, the consumer-friendly form of FIDO2 authentication, remove the password and the one-time code entirely, and with them the two things phishing is designed to capture.
The short version: a passkey is a cryptographic credential bound to the genuine website and stored on your device. There is no password or code to type, steal, share or read out over the phone, and it simply will not work on a look-alike site. That makes it resistant to phishing, adversary-in-the-middle relays and credential reuse alike.
Why passkeys beat credential phishing
A passkey works through public-key cryptography. When you register, your device keeps a private key and the service keeps the matching public key; signing in proves you hold the private key without ever transmitting a reusable secret. Crucially, the passkey is tied to the exact web address it was created for. On a fake look-alike page it simply refuses to authenticate, so the adversary-in-the-middle relay that defeats ordinary MFA has nothing to capture and nothing to replay.
What this shuts down
Because there is no shared secret, whole categories of attack fall away at once: there is no password to phish or reuse, no code to read out to a vishing caller, and no prompt to spam in an MFA-fatigue attack. It is the closest thing to a single control that neutralises the most common routes to account takeover.
How to roll passkeys out
Start with the highest-value accounts
Prioritise administrators, finance and executives, the accounts attackers want most, then widen coverage across the workforce.
Make them the easy default
Adoption succeeds when the secure path is the convenient one. Enable passkeys in your identity platform and guide staff through set-up so it feels effortless.
Keep a phishing-resistant fallback
Where a device does not yet support passkeys, prefer FIDO2 security keys over codes, and avoid falling back to weak recovery methods that reintroduce the risk.
Do not stop training
Passkeys are powerful, but rollout takes time and attackers will target whatever accounts remain on older MFA. Keep running realistic simulations and make it easy to report a suspicious email throughout the transition.
The bottom line
Passkeys tackle credential phishing at its root by removing the secret there is to steal. They are not a reason to abandon awareness training, but rolled out sensibly, high-value accounts first and as the easy default, they turn the attacker’s favourite prize into something that no longer exists.
Phishing Tackle offers the tools businesses need to strengthen their human risk strategies, with multi-platform testing, real-time behavioural insights, and actionable data to keep your organisation ahead of modern cyber threats.
Contact us today to learn how Phishing Tackle can help safeguard your organisation from the growing array of cyber risks.
