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Are attacks like these still possible? I've read here on HN that hardware makers are isolating the baseband processor as much as possible to prevent attacks like these. Surely there are countermeasures?

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Most modern phones have signed firmware for everything, so the FBI would have to go to the manufacturer and court order them to hand over the signing key. Or take advantage of a leaked key.

What I meant was chips are increasingly being isolated at the hardware level so that they cannot access other peripherals directly. This would make them resistant to compromised firmware attacks.

People are discussing that in this thread:

https://news.ycombinator.com/item?id=33958252

It looks like the implementation isn't perfect yet but it's a start.

I really wouldn't be surprised if some three letter agency hasn't shown up to every one of the major chip manufactures out there and forced them to install backdoors for them.

intel's ime is a perfect example

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