Hello and welcome to the Wednesday, May 17, 2020, edition of the Sansonet Stormer's Stormcast.

My name is Johannes Ulrich, and today I'm recording from Jacksonville, Florida.

Jesse today wrote about the effectiveness of Faraday bags.

These are bags that are supposed to block wireless

signals and doing so they are protecting, for example, your electronic device from connecting

to Wi-Fi or cell phone networks, but they're also often sold to protect, for example,

credit cards from being skimped.

In order to do this test, Jesse used Flipper Zero.

Flipper Zero, if you're not familiar with it, it's this little handheld tool that basically has multiple radius built in.

It's not the most effective or most sensitive device to, for example, detect RFID, but it's pretty good.

And of course, it is a likely device to be used by your average attacker.

So far, if a particular device does not block the flipper zero, it's probably not going to block any more

sophisticated device. Now, one tricky part about these fireday bags or blocking electromagnetic

waves in general is that the type of protection that you need often depends on the frequency

that you're trying to block. And of course,

with these different devices, there are a wide variety of frequencies being used. On the low end,

you have like these proximity cards that are often used sort of for door opening and such.

And on the higher end, you then have Wi-Fi and cell phone signals.

What Jesse found is that the bag that he tested, which, at least according to the way it sort of

looks on Amazon, is one of the little bit higher quality bags, did not manage to block any of the proximity cards and fobs.

It did block the credit cards or credit card could not be read.

Bluetooth, it interfered with it, but didn't completely cut it out.

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