this post was submitted on 09 Jan 2025
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Privacy
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I'd be curious to hear your criticisms of Signal! While I haven't seen anyone describing it as a "paragon of privacy and security" I do think it is a highly accessible SMS replacement that is also open source, end-to-end encrypted, and operated by a nonprofit.
I wrote a longer one here: https://dessalines.github.io/essays/why_not_signal.html
The short version is, that it's a centralized, US hosted service. All of those are subject to National Security Letters, and so are inherently compromised. Even if we accept that the message content is secure, then signal's reliance on phone numbers (and in the US, a phone number is connected to your real identity and even current address), means that the US government has social connection graphs: everyone who uses signal, who they talk to, and when.
The most obvious one that has been explained to death here is that Signal collects vast amounts of metadata. It's also a centralized service that's operated in the US, and it doesn't even make reproducible builds for the Android client.