Faraday Key Fob Security Pouch

[SteveTheStang]

I purchased a couple of these Faraday Key Fob pouches to protect my key fobs.

http://www.idstronghold.com/item.asp?PID=285

These pouches work perfectly! When my key fob is in the pouch I can't unlock or start the car. When I went on my last road trip, we carried the second key fob for the car. I noticed that with it in the car in my wife's purse that anyone could unlock the car at the door handle, but not start the car. Now I keep my keys in these little pouches and all is secure!

These guys shipped to Canada in approx. 6 business days

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[dogiebitt]

If you park your car outside (home or work), these are a must in my opinion. It's so easy to use a cheap home made signal amplifier to unlock and start the car even when the key is out of range.
In a pinch, wrapping it in tinfoil will also have the same effect.

 

[Skye]

I recently purchased some pouches from SLNT; they work as expected.

With the FOB in the pouch, even with the pouch itself open, I cannot open or start the car.

SLNT sells FOB pouches in two sizes: extra small and small. Extra small is enough for one FOB and maybe a key or two. Small is made for two FOBs, or a FOB with a lot of keys.

SLNT isn't the only manufacturer. I'm sure there are others who make fine products.

My area, maybe everywhere, experiences more thefts and break-ins throughout the Holidays. With the season approaching, you might be able to find one you like on sale, while protecting your ride and stuff at the same time.

 

[Johnnybee]

I wish someone would make a small, attractive key box (5-6 hooks) that you could mount on the wall near the front door. I’ve scoured Amazon but all they have are boxes for sitting on a table.

 

[Cobra Jet]

So what is the material that prevents the block of the fob signal?

How does that stop a Pro-Thief from scanning the vehicle's PCM to clone it's signal? Is the signal only transmitted from the fob - I mean, the car also has to have a signal transmission too, correct?

 

[Skye]

So what is the material that prevents the block of the fob signal?

How does that stop a Pro-Thief from scanning the vehicle's PCM to clone it's signal? Is the signal only transmitted from the fob - I mean, the car also has to have a signal transmission too, correct?

I've used ESD bags over the years and are familiar with those, but I've never opened or studied the innards of a faraday pouch. In general, the pouch/bag/cage is made in such a way where the electrical signals attempting to cross through the media are absorbed by it or pass around it and ultimately go to ground. Our buildings at work are designed as huge Faraday cages, like in Enemy Of The State. Outside signals don't come into the work area, but dissipate across the cage and go to ground.

"Faraday bags can be made up of a wide range of materials but the most common are multiple layers of various metallic layers. For example, you can find copper, aluminum and static dissipative polyethene."

https://faradaybag.com/what-is-a-faraday-bag/

"static dissipative polyethene." ESD bags for protecting sensitive electronic components use materials like this. Electrical signals discharge across the bags exterior, not into it.

Regarding the interaction between the PCM and the FOB, it's my belief that a message hashing function is involved. The following videos help explain the use of hashes and keys in the open, while still remaining secure between two parties.

Large prime numbers, modulus math and simple algorithms can create huge hash functions and keys for securing channels or confirming who the other party is.

The physical interaction of signals, it appears to be one-way: from the FOB to the car. The car/PCM receives the message, compares it against what it has on-hand, and allows or denies access.

 

[RagmopInKona]

I'd like a micro switch on the fob, to shut off the signal. Or a combo of buttons, on the fob does it. like to remote start you hit lock then another button twice. Program the things so, for example , you hit the remote start button 4 times it shuts off the signal from the fob. push the remote start button 3 times and the unlock button and it turns the signal back on.

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