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> Why worry about E2E encryption, in theory just need a cert issued from a vast array of CAs or intermediates.

Certificate Transparency thankfully means this is a tool a government could only use once if at all, and then they've burned an entire CA.

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Isn't certificate transparency opt-in, so any trusted CA could be a potential attack route.

Browsers now require it to consider a certificate valid. Firefox, Chrome, and Safari all require a certificate to include proof of being logged in CT logs.

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