this post was submitted on 10 Aug 2024
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Privacy
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Relevant context
Signal might be one of the most audited pieces of software in existence. Any criticism is likely either coming from or is supported by countries that fear encryption such as China, Russia and Iran.
The big downsides of Signal are that it requires a phone number and that is depends on Signals servers. That is it. You messages are completely safe as all messagers use the same underlying cryptography.
The audits mean nothing for a server domiciled in a Five-Eyes country. Signal has your phone number, and the other phone numbers you talk to (social connection graphs), and it is 100% illegal for them to tell you that they've been issued a national security letter divulging that information.
The entire protocol is build under the assumption that you do not need to trust the servers. Let the NSA have then, it doesnt matter. On the other hand 95% of Matrix users are hosted on Matrix.org which was not only hacked several times, but would be an ideal target for any agency to compromise. Its naiive to belive the big Matrix hosts arent compromised. The only effective defense is to build your system around the assumption that the server is compromised, which is what Signal did.