this post was submitted on 21 Jan 2024
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Privacy
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afaik, most if not all modern browsers and clients in e.g. apps, use Diffie-Hellman key exchange in TLS.
Some Apps go even further and implmement certificate pinning, only allowing a set of specific certificates the server is allowed to "present".
You can only break it by an active Man in the middle attack, presenting your own Diffie-hellman parameters toeachother and signing them with a certificate the client trusts (we can probably assume US agencies have access to some CA keys and can do this)
I dont think this is very feaseable on a large scale as you'd need to intercept every interesting connection, break the handshake, risking detection, and further proxy and process the whole traffic.
Metadata will be more juicy en mass than the content and easier to obtain with less risks.