How to Use Flipper Zero to Test Smart Lock Vulnerabilities

If you own a smart lock or access control system, Flipper is a useful tool for understanding its security. This guide covers testing only systems you own.

Types of Smart Locks and What Flipper Can Test

Testing RFID-Based Locks

1. Read the provided key fob with Flipper (LFRFID → Read)
2. Note the key type and ID
3. Emulate with Flipper — does the lock open?
4. If yes: the lock uses a simple fixed-ID system with no encryption

This is a common vulnerability in cheap access control systems. Many inexpensive RFID locks will open with any cloned fob.

Testing NFC Key Cards

1. Read the card (NFC → Read)
2. Check what data Flipper can access
3. Try to read all sectors — if sectors are open with default keys, the system is weak
4. Test emulation — if it opens the lock with just UID, that's a security issue

What Good Locks Do

• Rolling codes (change with every use)
• Encrypted sectors requiring specific keys
• Mutual authentication (lock and credential verify each other)
• Audit logs (you can see every entry attempt)

Improving Your Own Security

If Flipper can clone your access credential:

• Upgrade to a system using DESFire or MIFARE Plus
• Enable mutual authentication if your system supports it
• Use multi-factor (PIN + card)

Documentation

Keep notes on what you test:

• Lock model, firmware version
• Which attacks worked/failed
• Recommended upgrades