Electronic car keys and keyless entry systems make life easier, but they also come with a growing security risk: key cloning and relay attacks. Thieves no longer need to break into your home or physically steal your key — they can clone or amplify the signal and unlock your vehicle silently within seconds.
The good news is that protecting your key is straightforward. Here’s a clear, practical guide on key cloning protection using simple, effective methods.
1. Use a Faraday Pouch or Signal-Blocking Case
One of the fastest-growing forms of theft is a relay attack. Criminals boost the signal from your key to unlock the car remotely.
A Faraday pouch blocks this signal completely and is the simplest, most cost-effective defence.
Look for:
- Dual-layer shielding
- Full closure (Velcro, magnetic, or fold-over seal)
- Tested shield performance for modern keyless systems
This keeps your key invisible to thieves.
2. Store Your Keys Away From Doors and Windows
Most cloning devices work through walls — but only at short range.
Avoid placing keys:
- In the hallway
- Next to doors
- On window sills
- In open-plan spaces near the outside wall
Keeping keys further inside the home (Stored 3–5 metres from any outside access point) makes relay car key attacks much harder.
3. Disable Passive Keyless Entry (If Supported)
Some vehicles allow you to turn off keyless entry entirely while still allowing normal use.
Benefits:
- Stops the key from constantly broadcasting
- Prevents thieves from amplifying the signal
- Greatly increases your vehicle’s security
Check your in-car menu or manufacturer manual.
4. Add a Visible Physical Deterrent
Even with advanced technology, old-school security still works.
A steering lock, pedal lock or gear lock:
- Discourages thieves
- Adds time and noise to the theft attempt
- Makes cloning pointless
This is one of the most underrated car key security upgrades.
5. Consider a Ghost Immobiliser or Secondary System
A Ghost Immobiliser adds a hidden PIN sequence that must be entered before the engine can start.
This means:
- Even a cloned or boosted key won’t start the vehicle
- No signals to intercept
- No visible device to attack
It’s one of the strongest keyless entry theft prevention tools available.
6. Keep Your Vehicle Software Updated
Manufacturers sometimes release security updates that improve:
- Encryption
- Key frequency handling
- Authentication
- Relay resistance
These updates are not always applied automatically — ask your dealer or service centre.
7. Be Cautious About Who Handles Your Key
A modern key can be cloned in under 60 seconds if someone has physical access.
Take extra care at:
- Car washes
- Valet services
- Unfamiliar garages
- Pop-up key-cutting stalls
If someone must take your key, keep it visible or locked in a Faraday pouch.
8. Get Your Key Checked if Something Feels “Off”
If your key:
- Unlocks from far away
- Behaves erratically
- Has a rapidly draining battery
…it may be worth having it checked.
A professional locksmith like LockCo can:
- Test the key’s signal
- Inspect the transponder
- Check for interference
- Advise on upgrades
Peace of mind is worth it.
Final Word
Protecting your electronic car key from cloning is simple when you combine smart habits with the right tools. A Faraday pouch, careful key placement, visible deterrents, and optional immobiliser upgrades all dramatically reduce risk.
🏠 Best Places to Store Your Key
A drawer in the middle of the house
- A cupboard away from external walls
- Upstairs in a bedroom drawer
- Inside a Faraday box/pouch kept in a central location
🚫 Worst Places
- On the hallway table
- Hanging by the front door
- On a kitchen window sill
- Near patio doors
- In the garage near the car
These spots make relay theft easy.
If you need help, advice, or a spare electronic car key, LockCo offers expert support and security solutions to keep your vehicle safe.
🔐 FAQ: Protecting Your Electronic Car Key From Cloning
1. Can thieves really clone my car key without touching it?
Yes. Relay devices can boost your key’s signal from outside your home, allowing thieves to unlock and start your car without ever handling the key itself.
2. How far should I keep my key from doors and windows?
Ideally 2–4 metres (6–12 feet) away from any exterior wall, door, or window — and even better if stored inside a Faraday pouch.
3. Do all cars support disabling keyless entry?
No. Some manufacturers include this option; others don’t. You’ll need to check your vehicle settings or speak to the dealer to confirm.
4. Can a Faraday pouch stop relay attacks completely?
A high-quality Faraday pouch with dual-layer shielding will block the key signal entirely, making relay cloning almost impossible.
5. What should I do if I think my key has been cloned or tampered with?
Contact a professional locksmith immediately. They can test the key, check the signal, and reprogram the system if needed to secure your vehicle.
