Countersurveillance with a Faraday Bag

Countersurveillance with faraday bag

Surveillance can be categorized into physical and technical surveillance. To mitigate technical surveillance, a common advice is to keep your phone at home when you go out.

But if you really need to take your phone with you, what should you do?

Learn what is a Faraday bag and how to use it to prevent your phone from receiving and emitting traceable signal for countersurveillance in this article.

What is a Faraday Bag?

Faraday bag from Mission Darkness
Faraday bag from Mission Darkness

Faraday bag is a bag lined with thin metal sheets or meshes, in order to block electromagnetic waves from passing in and out from the bag.

The way Faraday bag works is the same with Faraday cage. When an electromagnetic wave contacts the metal sheets, electrostatic induction happens and an opposing electrical field would be created, thus devices inside the bag are unaffected by the electromagnetic wave.

Therefore, Faraday bag can stop electric devices inside from receiving and sending signals, preventing anyone to track you with the signal of your devices.

Depending on the metal used by the bag, most of the Faraday bags can block cellular signal(2G, 3G, 4G), Wi-FI, Bluetooth, GPS, RFID, NFC and radio signal.

Since Faraday bag can prevent items inside the bag from emitting and receiving any signal, it can also be used to prevent EMP attack as well.

Faraday cage in a museum
A Faraday cage

Countersurveillance with a Faraday bag

If you believe that you are being watched, you have to assume that you are being watched both physically and technically.

Put your phone or any device that would receive and emit signals into the Faraday bag to ensure you will not be tracked technically. After that, you can try to evade their physical surveillance.

Besides, you can also keep another phone in your Faraday bag(make this a secret!) and use it when it is really necessary. This phone is less likely to be tracked and you can contact anyone you want without those following you knowing.

None

A few layers of aluminum foil and a small, sealable bag.

DIY your Faraday Bag

This tutorial will teach you how to make your own Faraday bag

Step 1: Line the bag with aluminum foils

Line the bag with aluminum foils. Fix their position with tape or anything you want. The thicker the lined metal layer, the harder for electromagnetic waves from passing in and out from the bag.

Step 2: Test your DIY Faraday bag

Put your phone inside your DIY Faraday bag, seal it and try calling and messaging it. If the phone does not ring and you receive messages you sent only after you take it out from the bag, then the bag is working as you wish.

FAQs

What is a Faraday bag?

Faraday bag is a bag lined with thin metal sheets or meshes, in order to block electromagnetic waves from passing in and out from the bag.

What signals and electromagnetic fields can be blocked by Faraday bags?

Depending on the metal used by the bag, most of the Faraday bags can block cellular signal(2G, 3G, 4G), Wi-FI, Bluetooth, GPS, RFID, NFC and radio signal.

Can I DIY my own faraday bag?

Absolutely. The easiest way to make your own faraday bag is to put a few layers of aluminum foil inside a small, sealable bag to block electromagnetic fields.

Reference

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