Millions of developers use desktop Macs and Linux machines without any biometric auth. We're building a tiny wireless fingerprint key to fix that.

If you use a Mac mini, Mac Studio, or a MacBook in clamshell mode with an external keyboard, you know the pain: no Touch ID. Apple’s only solution is a $199 Magic Keyboard — and if you prefer a mechanical keyboard, you’re completely out of luck.

Linux users have it even worse. fprintd exists, but good hardware options are scarce.

The problem

Every time you:

• Unlock your screen
• Run sudo / ssh
• Approve a system dialog
• Sign a Git commit

…you type a password. Dozens of times a day.

Our solution

immurok is a tiny wireless device with a capacitive fingerprint sensor. It connects via Bluetooth LE and replaces passwords with a single touch:

• Screen unlock — touch the sensor, screen unlocks
• sudo & PAM — custom PAM module intercepts auth prompts
• SSH agent — sign commits and SSH into servers with your fingerprint
• Open source — the macOS app and PAM module are fully auditable

Security first

Your fingerprint template never leaves the device. Authentication uses ECDH P-256 key exchange and HMAC-SHA256 signed messages. There’s no cloud, no account, no telemetry — everything works offline over Bluetooth.

We’ll be sharing more technical deep-dives on the BLE protocol, PAM integration, and firmware architecture in upcoming posts. Stay tuned.