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(How) can a modem spy on you?
(self.privacy)
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this post was submitted on 06 Sep 2024
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Privacy
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In an absolute sense, yes a modem can spy on you by hijacking requests and redirecting them to controlled locations. We use TLS to prevent this, even stronger with technologies like HSTS.
Does this happen in real life though? More then you think, but less of an impact then you think.
Some US providers will hijack DNS requests and redirect them to their own DNS servers, but this can be solved with DOH or DOT.
TLS interception is a thing but it requires the device you are using (phone, PC, tablet, laptop) to have a root certificate installed that the ISP also controls. Almost all browsers will only install root certificates from root certificate providers with good standing and have no quarm in untrusing the root certificate if things go badly.