81–90 of 205 posts
This is a super cool blog post. However I think it alludes to a much larger problem. For many products today, it’s very difficult or impossible for most people to verify the product works. For a network switch, there are free and open source tools like iPerf to test and verify speeds are as advertised. For a faraday box, you have to go through all these steps (and knowledge learned) just to be able to test these. Wha…
> "Wrap it in tin foil" is perhaps the most common advice [...] Unfortunately the results were extremely inconsistent [...] 90 dB attenuation in one test would produce only 50 dB the next time [...] You would have no way to tell whether you've managed to fold and seal it adequately well On the other hand, aluminium foil is incredibly commonly available, if not in a kitchen draw, it will be at the nearest shop. Althou…
Microwave ovens make for poor Faraday cages. The problem is that you only need 30-60dB to "keep the power in" while you probably want at least 100dB to "keep the signals out." You can test this: put your phone in the microwave and try to call it. Over the years I have had about a 75% success rate. Other household appliances tend to be even worse; any gaps in metallic seals effectively turn into slot antennas and let…
DO NOT MICROWAVE YOUR PHONE.
The test involves placing your phone in the microwave and closing the door without turning the microwave on. I'd unplug the microwave before trying this.
This is a super cool blog post. However I think it alludes to a much larger problem. For many products today, it’s very difficult or impossible for most people to verify the product works. For a network switch, there are free and open source tools like iPerf to test and verify speeds are as advertised. For a faraday box, you have to go through all these steps (and knowledge learned) just to be able to test these. Wha…
Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems. - Jamie Zawinski via Coding Horror [0]
To your point, maybe Zawinski's aphorism is broader than regexp.
The quote investigation [1] linked from CH is well worth reading.
0. https://blog.codinghorror.com/regular-expressions-now-you-ha...
Perhaps it sounds like overkill, but it’s the only way I seem to be able to fully isolate the devices.
That said, I’d probably just buy a bag... but I’ve been trying to keep it with what I have lying around the house.
I really like Snowden's recommended Faraday cage for phones or other devices of similar size: two drink-shaker cups[1]. Drink shakers are cheap and widely available. The average hotel room in any medium/large hotel chain probably includes a shaker as a standard item as part of the minibar. The simple two-cup style (as seen in [1]) is preferred over the fancier "strainer top" style because you can press the two cups t…
Maybe the hotels you stay in, Bond, James Bond.
Earlier quoted context omitted.
I assume for the same reason you ground your home, building up charges is a great way for Bad Things to happen.
Why would a phone pouch/box build up great charge? You don't ground your home because of charge buildup either - grounding is there to decrease the chance a thunderbolt will run through precious things, like house walls, people, electric wiring etc.
My understanding is that a Faraday Cage, of any size, relies on a proper grounding system to work at all so these boxes and rfid blocking pockets etc all seem to be tinfoil hats parading as space age metamaterials.
This is a super cool blog post. However I think it alludes to a much larger problem. For many products today, it’s very difficult or impossible for most people to verify the product works. For a network switch, there are free and open source tools like iPerf to test and verify speeds are as advertised. For a faraday box, you have to go through all these steps (and knowledge learned) just to be able to test these. Wha…
It's supposed to be called the Federal Trade Commission.
These agencies seem to test one vector while ignoring everything else. I don't trust them.
https://www.consumerreports.org/food-safety/your-herbs-and-s...
I really like Snowden's recommended Faraday cage for phones or other devices of similar size: two drink-shaker cups[1]. Drink shakers are cheap and widely available. The average hotel room in any medium/large hotel chain probably includes a shaker as a standard item as part of the minibar. The simple two-cup style (as seen in [1]) is preferred over the fancier "strainer top" style because you can press the two cups t…
“Security Mints - sweet & secure”.
Maybe a kickstarter?
> "Wrap it in tin foil" is perhaps the most common advice [...] Unfortunately the results were extremely inconsistent [...] 90 dB attenuation in one test would produce only 50 dB the next time [...] You would have no way to tell whether you've managed to fold and seal it adequately well On the other hand, aluminium foil is incredibly commonly available, if not in a kitchen draw, it will be at the nearest shop. Althou…
Microwave-ovens definitely don't leak below 2.4 GHz. Any frequency above that is a non-issue for microwave-oven operator safety. It also wouldn't be an issue for any communication device transmitting below 2.4 GHz. If you want to shut down 5 GHz communication then a microwave-oven would be leaky. 60 GHz: it shouldn't matter since it needs LoS anyway. Also, remember to ground your faraday cages.