this post was submitted on 07 May 2025
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Privacy
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The direct answer to your question is: verification of the security of the platform that the other party is using is outside of the scope of the Signal protocol. Anything you send to the other party can be taken off of their device. Signal only concerns itself with securing the message over the network and making it hard for an adversary with network dominance to build a social graph. It doesn't protect from all SIGINT.
Additionally, since the server is open source and the protocol is open an publicly documented, it is completely possible to build your own Signal client and give it whatever capabilities that you'd like.
There are several open source packages available that allow you to interface with Signal without using the official Signal client:
https://github.com/AsamK/signal-cli
https://gitlab.com/signald/signald (also, https://signald.org/articles/clients/ )