Messaging reliability explained: encrypted calls, WebRTC, multi-device sync, offline delivery, internet shutdowns and reconnect recovery.
The network is part of every conversation. These guides look at what happens when a call starts, a device reconnects, an app moves to the background, or a connection disappears.
Explore message delivery, offline outboxes, group calls and multi-device recovery. The articles separate privacy protections from the connectivity a messenger still needs.
What happens when my connection drops?
How are calls and message delivery different?
How does multi-device recovery work?
A guide to preparing accounts and devices, scheduling contact, choosing fallback routes and protecting information—without promising an always-connected messenger.
Encrypted voice calls and encrypted video calls are not sealed by the same machinery that seals a chat message. Messages live in a store-and-forward world, so they are encrypted with a ratcheting protocol before they ever touch a server; live media must survive packet loss and latency budgets measur
What do hashes, APK signatures, test vectors and reproducible builds prove? A method for recording tests with precise limits for Livara’s Proof Lab.
If your unlocked phone is stolen, take device locking and session revocation seriously. Learn the limits of post-compromise security and why a new message does not automatically eject the thief.
A padlock beside a chat proves nothing about the entire call. Assess media, signalling, the other person’s identity and recording mode separately.
Online status, delivery, reading and typing are different signals. Learn about their individual settings and the limits of what you can infer from them.
Prekeys let a sender start an encrypted session before the recipient reconnects. Learn how hybrid key establishment works and where its guarantees stop.
How can encrypted chats be searchable? Compare local indexes and encrypted-search designs, troubleshoot missing history and check what a server may learn.
Understand how encrypted messaging works across devices, why servers can store ciphertext, and why identity recovery is not the same as restoring chat history.
Understand the separate roles of WebRTC signaling and media encryption, why metadata remains visible and how server recording changes a call’s privacy boundary.
Compare FCM and direct background sync by payload exposure, routing metadata, delivery delays and battery tradeoffs—without assuming either is anonymous.
Understand encrypted identity backups, recovery secrets and server trust. Restoring a login or identity key does not automatically restore old chat history.
