Today in my surveillance class we're discussing Faraday bags for mobile devices: what threats they can (and most importantly, can't) protect against, the physics involved, and how to measure their effectiveness.
I wrote up a little blog post a while back: https://www.mattblaze.org/blog/faraday/
Should you keep your phone in a Faraday container? Probably not. But Faraday bags are useful to provide assurance against a particular, if narrow, range of threats, and understanding what they do and don't do for you is essential if you're considering using one.
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