We're going to be sharing sensitive information with a group of friends. It's not just about end-to-end encryption, but also user authentication and group management are crucial. In such scenarios, what methods should we focus on? Besides ensuring end-to-end encryption, how do you recommend managing authorization in group messaging? What additional measures can be taken to protect ourselves from attacks?
What methods should be used for secure messaging?
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For safe use with friends, I wholeheartedly recommend **Signal**. It's open-source, messages are end-to-end encrypted (including calls and video chats), and you can create groups with participant verification (QR codes or secure links). The best part is that even though the app tries to minimize data collection, you're not relying on sketchy cloud servers.
If you want more control, I've tested **Matrix (with Element)** for a client project. You can host your own server (or use a trusted host) to manage users and groups yourself. The encryption is solid, and you can add bots for moderation. The downside is that it requires a bit more tech-savviness to set up. In both cases, disable cloud backups and enable biometric locking.