Signal App
Signal App server side is questionable
- phone number
- contact sync
- server side logging (who talked to whom).
Server side audit and inspection is needed.
Most people quote a court hearing, where Signal didn't reveal metadata, but this alone could be is misleading projection of more-secure-than-it-is.
Signal App Server side self-hosting guide
2025-09-12
"Risky Backup feature introduced. Desktop version was already vulnerable to key copy."
Full video review here
Tor is another such more-secure-than-it-is exposed in book -
Surveillance Valley