this post was submitted on 10 Nov 2023
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There can be an infinite amount of certificates for a single domain.
When you setup a connection to a website you basically get a response back that has been signed with a certificate.
Your Browser / OS has a list of certification authorities that it deems trustworthy.
So when you get the response the browser checks if the certificate was issued by a trusted CA.
Now, if the EU forces browsers to trust their CA they can facilitate a man-in-the-middle attack.
In this instance they will intercept the TLS Handshake and give you back a response that was signed by their certificate. Your Browser deems the certificate valid and sets up a secure tunnel to the EUs Server.
From then on they can forward packets between you and the real website while being able to read everything in cleartext