Week 6: Secure Messaging

Secure Messaging Your text messages are not private. SMS travels through your carrier unencrypted. They can read every message, store them indefinitely, and hand them to law enforcement without a warrant. WhatsApp claims “end-to-end encryption” but shares metadata with Facebook—who you talk to, when, how often, your location. iMessage is better, but only between Apple devices, and iCloud backups often store your messages unencrypted on Apple’s servers. Real privacy requires end-to-end encryption with open-source, audited software. ...

Week 6: Private Messaging, Encrypted Email, and Metadata Hygiene

🎯 Goal Learn how to communicate securely using end-to-end encrypted messaging, GPG-encrypted email, and metadata minimization. Explore Signal, Matrix, OTR, and email tools. Understand operational privacy trade-offs. 1. Secure Messaging Protocols Overview Protocol E2EE Decentralized Metadata Safe CLI Available Signal ✅ ❌ (centralized) ❌ (requires phone number) ✅ (via signal-cli) Matrix (Olm) ✅ ✅ ⚠️ (servers can log) ✅ (nheko, gomuks, etc) XMPP + OTR ✅ ✅ ✅ (self-hosted possible) ✅ (profanity, mcabber) Tox ✅ ✅ (P2P) ✅ ✅ (toxic) 2. Signal CLI Setup Install signal-cli For Debian-based distros: ...