FCM vs Background Sync: Android Notification Privacy
Compare FCM and direct background sync by payload exposure, routing metadata, delivery delays and battery tradeoffs—without assuming either is anonymous.
Comparison
THE LIVARA BLOG / PRIVACY & TECHNOLOGY
A more private internet. A little more understood.
Ideas, explainers, and useful questions about encryption, private messaging, and the technology in your everyday life.
Discover the latest ↓UNDERSTAND SECURITY. MAKE ROOM FOR CONVERSATION.A publication by Livara ↗
THE READING ROOM
Fresh perspectives.
Encrypted Attachments: How Keys and Cloud Files Stay Separate
Learn how a messenger encrypts files before upload, delivers attachment keys, verifies downloads and handles the copies encryption cannot take back.
Comparison
Cryptographic Identity Recovery: Keys, Accounts and History
Understand encrypted identity backups, recovery secrets and server trust. Restoring a login or identity key does not automatically restore old chat history.
Field note
Messaging App Subpoenas: Content, Metadata and Limits
What can a messaging provider disclose? Separate server-held records, encrypted content, device access and backups without assuming E2EE means legal immunity.
News
Harvest Now, Decrypt Later: What It Means for Private Messaging
A practical explanation of stored ciphertext, future quantum risk, hybrid key establishment, and what post-quantum messaging cannot protect.
Field note
Post-Quantum Encryption in the Browser: Trust and Limits
How browser messaging can combine WebCrypto and ML-KEM, where web delivery changes trust, and what to verify about keys, updates, performance and storage.
News
SRP Password Authentication: Benefits and Breach Limits
Understand what SRP hides during login, why stolen verifiers still permit password guessing, and how authentication differs from chat encryption and recovery.
Field note
SIM Swaps and Messaging Accounts: Risks and Protection
A stolen phone number can expose SMS login and recovery. Learn what protects messaging accounts, why old chats are a separate question, and what to do next.
News
Hybrid Post-Quantum Ratchets: ML-KEM-768 and P-256
How hybrid chat ratchets combine classical and post-quantum secrets, why epochs affect overhead, and which security and performance claims need evidence.
Field note
Encrypted Group Admin Controls: Membership, History and Removal
Compare group entry, old-message access and removal across six messengers, then use a harmless rehearsal to test the settings your group actually relies on.
Comparison
How to Hide Android Message Previews: Phone, Watch and History
Keep alerts without exposing chat text. Review lock-screen, app and wearable settings, then test what remains visible and stored in notification history.
Guide
Can Public Wi-Fi Read Your Messages? Encryption, Risks and Checks
Understand what a hotspot can see, how HTTPS differs from end-to-end encryption, and what to do about suspicious portals, certificate warnings and device risks.
Field note
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