If they did, then the device is functioning exactly as designed. This is not a "break" or a "hack". 10/
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Replying to @matthew_d_green
If you're judging implantable device security, the question you should ask is: can I send a shock command *from a distance*... 11/
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Replying to @matthew_d_green
... without first making close (<10cm) physical contact with the patient. If the answer is "no", then the device is working as intended. 12/
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Replying to @matthew_d_green
And last point: "we think we could extend the range someday" is not an answer. It usually means the researchers don't understand RF. 13/
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Replying to @matthew_d_green
In practice, most implantable devices use an inductive (EM) channel for initial contact. These have 1/R^3 signal strength dropoff. 14/
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Replying to @matthew_d_green
Unlike ordinary RF which has 1/R^2 signal strength dropoff. Extending EM range is not as easy as just "build a slightly bigger antenna". 15/
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Replying to @matthew_d_green
EM and RF are the same thing, I assume you mean a magnetic field?
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Replying to @captain_test
I mean inductive coupling. That's correct. Most manufacturers call it "EM" as opposed to "RF".
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Replying to @matthew_d_green
Well, inductors do couple with radiation, as in a loop antenna or the common AM antenna.
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Replying to @NYarvin @matthew_d_green
The trick that implantable devices use is to operate at low frequencies (less than a MHz), where transmission is hard.
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At low frequencies, unless you have a huge antenna you get a lot of near field without much far field.
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Replying to @NYarvin @matthew_d_green
So your basic point is correct, but "near field" vs "far field" is the proper technical terminology, not RF vs inductive.
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Replying to @NYarvin
Ha, I never said *I* understand RF either ;) But good to know I'm not fundamentally wrong.
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End of conversation
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