The Silent Data Disaster Hiding in Your Passkeys

If you think your passkeys are just a safer way to log in, you might be in for a rude awakening. A growing number of tech companies are using passkeys not just for authentication, but also to encrypt your most sensitive data—and that’s creating a ticking time bomb for millions of users.

The Hidden Risk Nobody’s Talking About

Passkeys were supposed to be the phishing-resistant future of authentication. They work great for that. But here’s where things get dangerous: some services are now using passkeys with the PRF (Pseudo-Random Function) extension to encrypt your data—including message backups, documents, crypto wallets, and more.

The problem? When you delete that passkey, thinking it’s just another login credential, you might be permanently destroying access to irreplaceable data.

A Real-World Nightmare Scenario

Meet Erika. She enabled encrypted backups in her favorite messaging app, using her passkey to protect precious photos of loved ones who have passed away. A year later, while cleaning up her credential manager, she deletes what looks like an old, unused passkey. No warning. No indication of what she’s losing.

When she gets a new phone and tries to restore her backup, she’s greeted with a devastating message: her passkey is gone, and so are her memories. Forever.

The UI Problem

This isn’t theoretical. Here’s what users actually see when deleting passkeys across major platforms:

Apple Passwords: A simple “Delete” button with no mention of potential data loss

Google Password Manager: Same story—clean interface, zero warnings about encrypted data

Bitwarden: Even password managers designed for security aren’t highlighting this risk

How is an average user supposed to understand that clicking “Delete” might erase photos of deceased relatives, encrypted property deeds, or their entire digital currency holdings?

Why This Matters Now

The PRF extension exists in WebAuthn for legitimate reasons—primarily to help credential managers unlock their vaults more securely. But the moment companies started using it to encrypt user data, they created a massive vulnerability.

Credential managers have multiple recovery options: master passwords, per-device keys, recovery keys, social recovery. But when a passkey is used purely for data encryption, there’s often no backup plan.

The Industry’s Wake-Up Call

This isn’t just one person’s concern. Security experts are increasingly worried about this trend. The identity industry needs to make a critical choice: either stop using passkeys for encryption entirely, or implement serious safeguards.

What Needs to Happen Immediately

For credential managers: Add prominent warnings when users attempt to delete passkeys with PRF enabled. Show exactly what data could be lost.

For services using this approach: Create clear documentation explaining the dual use of passkeys, provide upfront warnings during setup, and implement recovery options that don’t rely solely on the passkey.

The Bottom Line

Passkeys are revolutionary for authentication. But overloading them with encryption responsibilities creates a fragile system where a single mistake can result in permanent data loss. In an age where our digital memories and assets are increasingly valuable, this isn’t just a technical issue—it’s a potential crisis waiting to happen.

The tech industry needs to act now before millions of users learn this lesson the hard way.

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