What Are Passkeys? A Practical Guide for Businesses Moving Beyond Passwords

Passkeys are a safer, faster way to sign in without passwords. Here’s what they mean for Microsoft 365 users, business security, and phishing-resistant authentication.

Passwords have been the default way to sign in for decades, but they are also one of the weakest points in business cybersecurity.

People reuse passwords across accounts, save them in unsafe places, and sometimes type them into convincing fake login pages without realising it.

Passkeys are designed to solve that problem. They replace passwords with a secure sign-in method that uses your device, such as your phone, laptop, fingerprint, face scan, or PIN.

For businesses, especially those using Microsoft 365, passkeys are becoming an important part of passwordless authentication and phishing-resistant multi-factor authentication.

In this guide, we explain what passkeys are, why they are harder to attack than passwords, and how your business can start using them without disrupting staff.

What is a passkey?

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 stays locked on your device and never leaves it.

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 how most break-ins start.
• There’s no password to steal in a breach. The website only keeps your public key, which is useless on its own. If the company gets hacked, there’s no password list to grab and try on your other accounts.
• 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.

Who supports passkeys?

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 across all your devices and you’re covered if you lose one.

 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 synced passkey takes about 3 seconds, against roughly 69 seconds for 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 so nobody gets locked out along the way.

What to watch out for when rolling out passkeys

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.

Passkeys: frequently asked questions

Are passkeys safer than passwords?

Yes. They can’t be phished, there’s no password for a hacker to steal in a data breach, and there’s nothing to reuse or forget. 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 your other devices. If it was device-bound and you have no backup, you’d use a recovery method to get back in, which is why setting up a second passkey or device in advance 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.

Need help enabling passkeys for Microsoft 365?

If your business uses Microsoft 365 and wants to reduce password risk, Techtron can help you plan and roll out passkeys, Microsoft Entra authentication methods, Conditional Access, and safer account recovery processes.

Ready to improve your sign-in security? Contact Techtron to review your Microsoft 365 security setup and create a practical passwordless authentication roadmap for your team.