Communications

Messaging, email, and the metadata problem, what end-to-end encryption protects and what it structurally cannot.

Communication privacy has two layers: the content of what you say, and the record of who you talked to, when, and how often. Modern encryption has largely solved the first layer for anyone willing to choose the right tools. The second layer (metadata) is harder, less discussed, and in many investigations more valuable than content.

These pages cover both, and are blunt about where email in particular cannot be fixed.

Messaging What end-to-end encryption guarantees, how the mainstream messengers differ, and the settings that matter after you pick one.
Email Email cannot be made private end-to-end in practice. What encrypted providers actually protect, and how aliasing limits the damage.
Communication Metadata Who you talked to, when, and how often, why the envelope is often worth more than the letter, and what actually reduces it.