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The tutorial discusses secure messaging, focusing on end-to-end encryption and advanced features like secure ratcheting. It emphasizes the importance of strong security in practical contexts, particularly in group messaging, which is as essential as one-to-one messaging on platforms like WhatsApp, Allo, and Slack. The speaker highlights that group messaging should offer the same security guarantees as one-on-one communications. Additionally, unlike traditional secure connections like TLS or SSH, messaging does not assume all participants are online, as users may connect through various networks, such as hotel Wi-Fi. Overall, the goal is to ensure robust security for all messaging formats.