Passkeys Explained: Why You Should Ditch Passwords

For decades, we have relied on a flawed system to protect our digital lives. We create complex passwords, forget them, reset them, or worse, reuse the same password for every account. Tech giants like Google, Apple, and Microsoft are finally pushing a solution that aims to kill the password for good. They call it the passkey.

What Is a Passkey?

A passkey is a digital credential that allows you to sign in to apps and websites without typing a single character. Instead of a string of letters and numbers that you have to memorize, a passkey is a cryptographic entity stored securely on your device.

When you use a passkey, your device acts as the key to your account. You unlock access using the same method you use to unlock your phone, such as a fingerprint, face scan (like Face ID), or a device PIN.

Technically, passkeys are built on the WebAuthn standard developed by the FIDO Alliance. This is an open industry association whose mission is to develop authentication standards that help reduce the world’s over-reliance on passwords. Because it is an open standard, it works across different operating systems and browsers, including Chrome, Safari, and Edge.

How Passkeys Work: The "Key Pair" Concept

To understand why passkeys are superior to passwords, you have to understand the mechanics of public-key cryptography. When you create a passkey for an account, such as your Google or Amazon account, the system generates a unique pair of distinct keys:

  1. The Public Key: This is sent to the website or app server. It is like a padlock that anyone can see.
  2. The Private Key: This stays securely on your device. It never leaves your phone or computer.

When you try to log in, the website presents a mathematical puzzle (a “challenge”) encrypted with the public key. Your device detects this challenge and asks for your permission to solve it. Once you verify your identity with your biometric scan or PIN, your device uses the Private Key to solve the puzzle and send the answer back.

The website confirms the answer fits the lock and lets you in. Crucially, the website never sees or receives your private key.

Why Google and Apple Want You to Switch

The push for passkeys is not just about convenience; it is about eliminating the massive security holes inherent in passwords.

1. Total Immunity to Phishing

Phishing attacks are the number one cause of data breaches. In a typical attack, a hacker sends you a fake link that looks like the real login page for PayPal or your bank. If you type your password into that fake site, the hacker steals it.

With passkeys, phishing is impossible. The passkey protocol binds the credential to the specific domain (website address). Your iPhone or Android device knows that google.com is not the same as g00gle.com. If you land on a fake site, your device will simply refuse to offer the passkey because the digital handshake fails.

2. Eliminating Server-Side Breaches

If a hacker breaches a company’s database, they often steal millions of user passwords. Even if those passwords are encrypted, sophisticated hackers can often crack them.

If a hacker breaches a server that uses passkeys, they steal nothing of value. They only get the “Public Keys.” These are useless without the corresponding Private Keys, which remain safely on the users’ physical devices.

3. Speed and Friction

Google data suggests that sign-in times with passkeys are 50% faster than using passwords. There is no typing, no mistyping, and no waiting for a two-factor authentication (2FA) SMS code to arrive.

Major Brands Leading the Charge

Adoption is accelerating rapidly. Google has already made passkeys the default sign-in option for personal Google Accounts. Other major platforms currently supporting passkeys include:

  • Amazon: You can set up a passkey in your “Login & Security” settings to shop without a password.
  • WhatsApp: Added support for iOS users to log in back into their accounts.
  • Uber & Uber Eats: Allows for quick booking and ordering without credential fatigue.
  • eBay & PayPal: Both were early adopters of FIDO standards.
  • TikTok: Rolled out support to enhance account security.
  • Nintendo: Recently added passkey support for accessing Nintendo Accounts.

What If I Lose My Device?

This is the most common fear regarding passkeys. If the key is on the phone, and the phone is gone, is the account gone?

Fortunately, the tech giants have solved this through cloud synchronization:

  • Apple Users: Passkeys are stored in the iCloud Keychain. If you lose your iPhone, you simply buy a new one and sign in with your Apple ID. Your passkeys will automatically sync to the new device. It is end-to-end encrypted, meaning even Apple cannot see your keys.
  • Android/Google Users: Passkeys are backed up to the Google Password Manager. If you get a new Android phone, signing into your Google account restores your access to your other passkeys.
  • Third-Party Managers: Password managers like 1Password, Dashlane, and Bitwarden now support passkeys. This is often the best option for people who switch between iPhone and Android frequently, as these apps sync your keys across all platforms regardless of the operating system.

Using Passkeys Across Different Devices

A common hurdle is logging into a computer using a passkey stored on a phone. For example, logging into a website on a Windows laptop using a passkey stored on an iPhone.

This is handled via Cross-Device Authentication (CDA). When you try to log in on the computer, the website will display a QR code. You scan this code with your phone’s camera. Your phone and the computer verify they are close to each other using Bluetooth (to prevent remote attacks), and then your phone authorizes the login.

Frequently Asked Questions

Can I still use a password if I want to?

Yes. Currently, most services treat passkeys as an alternative, not a mandatory replacement. If your device battery dies or you cannot use your passkey, you can usually fall back to a password or another recovery method.

Does Google or Apple get my fingerprint?

No. Your biometric data (fingerprint or face map) never leaves your device. The biometric scan only unlocks the “Private Key” inside the phone’s secure enclave. The server only receives a mathematical confirmation that the key was unlocked.

Do passkeys expire?

Generally, no. Unlike passwords that IT departments often force you to change every 90 days, passkeys remain valid until you delete them or revoke access from the account settings.

What happens if I want to share a login, like for Netflix?

Passkeys are harder to share than passwords, which is a feature for security but a bug for convenience. However, managers like 1Password and Apple’s Family Sharing now allow you to securely share specific passkeys with trusted contacts.

Are passkeys the same as Two-Factor Authentication (2FA)?

Passkeys actually replace both the password and the 2FA method. Because the passkey requires possession (your phone) and inherence (your fingerprint), it satisfies strong multi-factor authentication requirements in a single step.