Cybersecurity
What Is a Passkey? A Safer, Faster Way to Log In Without Passwords
A passkey lets you sign in using the same fingerprint, face, or PIN you already use to unlock your phone, with no password to type or steal. Built on the FIDO standard, passkeys can't be phished because they only work on the real site they were created for, and most major platforms already support them, including Microsoft 365 at no extra cost. This guide explains how passkeys work, why they're safer than passwords, and how to start rolling them out.
Passwords are the weak point in most businesses.
People reuse them across accounts, write them on sticky notes, and type them into convincing fake login pages without realizing it.
Passkeys are the technology built to replace passwords, and they fix the parts that cause the most trouble.
A passkey lets you sign in with the same fingerprint, face scan, or PIN you already use to unlock your phone or laptop. There's no password to type, so there's nothing for an attacker to steal, guess, or trick out of you.
This guide covers what passkeys are, why they're so much harder to attack than passwords, and whether your business should start using them.
What a Passkey Is
A passkey replaces your password with your device's own security.
Instead of typing a password, you prove it's you the same way you unlock your phone: a fingerprint, a face scan, or a PIN.
When you set up a passkey for a website, your device creates two matching keys. The private key never leaves your control, and the website only ever gets proof that you have it, never the key itself. The public key is stored by the website.
When you sign in, the site sends a challenge that only your private key can answer, your device answers it once you confirm with your fingerprint or PIN, and you're in. The website never sees a password, because there isn't one. This approach comes from a standard called FIDO, which Apple, Google, and Microsoft all build on.
Why Passkeys Are Harder to Attack Than Passwords
A password is a secret you share with the website every time you log in, and that's exactly what attackers go after. A passkey has no shared secret. That one difference fixes the biggest problems with passwords.
- They can't be phished. A passkey only works on the real website it was created for. Land on a convincing fake, and the passkey simply won't work, so there's nothing to hand over. That matters, because phishing is one of the most common ways attackers get in.
- There's no password to steal in a breach, once passwords are actually turned off as a way to sign in or recover the account. The website only keeps your public key, which is useless on its own, so a hack there doesn't hand attackers a password list. Until passwords and password-based recovery are fully retired, though, whichever of those is still active alongside a passkey remains just as stealable and phishable as before.
- Nothing to reuse or forget. Each passkey is unique to one site and made automatically, so reused and weak passwords stop being a problem.
Older methods like text-message codes and app approval prompts can still be tricked out of people. Passkeys close that gap.
Where You Can Use Passkeys Already
Support has spread fast. You can already sign in with passkeys to Microsoft, Google, and Apple accounts, plus a growing list of banks, password managers, and business tools. Apple, Google, and Microsoft have built passkeys into their phones, laptops, and browsers, so the device in your pocket can already store and use them.
There are two types worth knowing.
A synced passkey is backed up to your Apple, Google, or Microsoft account, so it works on any of your devices signed into that same account and you're covered if you lose one of them.
A device-bound passkey stays on a single device, like a physical security key you plug in, which is the most locked-down option and a common pick for sensitive accounts.
Should Your Business Use Passkeys
For most businesses, yes, and you can start small. There's no need to switch everything overnight or drop passwords on day one.
If you use Microsoft 365, passkeys are already available through Microsoft Entra. Staff can sign in with a passkey stored in the Microsoft Authenticator app, a security key, or their own device. Google Workspace supports them too.
They're also just faster. Microsoft says signing in with a passkey is about 3 times faster than a password, and roughly 8 times faster than a password plus a traditional MFA code. Across a whole team, that adds up.
Here's how you can start using passkeys.
- 1. Turn passkeys on for your most sensitive accounts first: administrators, finance, and anyone who can move money or change systems.
- 2. Let everyone else add a passkey as a faster, safer way to sign in, alongside their normal login at first.
- 3. Make sure each person has a backup, like a second device or a security key, so a lost phone doesn't lock anyone out.
Your IT provider can switch this on and run the rollout to keep lockout risk low along the way.
What to Watch Out For
Passkeys aren't magic, and a few things are worth planning for.
- Account recovery. If someone loses the only device with their passkey and has no backup, they can get locked out. A synced passkey or a second registered device fixes this, but you have to set it up ahead of time.
- Not everything supports them yet. Support is growing fast, but some older systems and smaller vendors still rely on passwords, so you'll run both side by side for a while.
- Shared devices and logins. Passkeys are tied to a person and their device, so any shared computers or shared accounts need their own plan.
Cyber One Solutions can help you turn on passkeys for your most sensitive accounts and plan a rollout that keeps lockout risk low. If you're not sure where your business stands today, contact us and we'll take a look.
Frequently Asked Questions
What is a passkey in simple terms?
It's a way to log in using your fingerprint, face, or PIN instead of a password. Your device proves it's you to the website, so no password is typed or stored for that sign-in. If the account still has a password enabled alongside it, such as during a transitional rollout, that password remains a separate, unaffected part of the account until it's turned off.
Are passkeys safer than passwords?
Yes. They can't be phished, there's nothing to reuse or forget, and once passwords are actually retired as a sign-in or recovery option, there's no password left for a hacker to steal in a breach. Security agencies like CISA recommend FIDO-based logins, which is what passkeys are, as the strongest widely available option.
What happens if I lose the device with my passkey?
If it was a synced passkey, it's backed up to your Apple, Google, or Microsoft account and still available on any other device signed into that same account. If it was device-bound and you have no backup, recovery depends on whether that service has an account-recovery option set up in advance, and you could be locked out if it doesn't, which is why setting up a second passkey or device ahead of time matters.
Does Microsoft 365 support passkeys?
Yes. Passkeys are available through Microsoft Entra at no extra cost, including the free tier. Staff can use a passkey in the Microsoft Authenticator app, a security key, or their device.
Do passkeys replace multi-factor authentication?
A passkey can count as multi-factor authentication on its own. Unlocking it needs both your device (something you have) and your fingerprint, face, or PIN (something you are or know), so it covers two factors in one step and can replace the old password-plus-text-code routine.