I’m on the lookout for a chat application that prioritizes privacy, available for desktop or web use. It should feature end-to-end encryption, enable users to export entire chat histories, and provide the option to delete all messages in bulk later on.
Twice as true for any client!
The best thing a server can do is simply be a temporary relay before messages get to those clients. And the messages themselves should be undecipherable. (I’m probably preaching to the choir here, but for those who don’t know, that’s how apps like Signal work.)