Are Signal Messenger's servers able to see who I'm talking to?
I'm aware of Signal's "no log policy", but I'm wondering if such information is visible to the servers at all. I'm assuming "Sealed sender" is what is supposed to protect this information? If so, how effective is it?
When subpoenaed by the FBI they were only able to give the phone number, time of account creation and time of last connection
It’s impossible to turn over data that we never had access to in the first place. Signal doesn’t have access to your messages; your chat list; your groups; your contacts; your stickers; your profile name or avatar; or even the GIFs you search for.
This would have to be available. The only way to avoid metadata like this is something like onion routing... Session will do that, probably your best bet if you're worried about this.