Secure Drop
Anonymous · Encrypted · No login required
Your message is sealed and anonymous. We cannot identify you. No account or login is needed.
Your message
Max 3 files, 10 MB each
Secure Channel
Anonymous · Bidirectional · Encrypted
Start an anonymous conversation. You'll receive a thread code to check for replies later.
Your message
Max 3 files, 10 MB each
Thread Code
Enter your thread code above to check for replies.
SECURE COMMUNICATION, EXPLAINED

Knowledge you can verify

Source-backed guides to encryption, identity, privacy, and secure communication—written to clarify the tradeoffs, not sell around them.

Weekly editorialOne carefully researched article each week. Every technical claim is reviewed before publication.
LATEST ARTICLE

What End-to-End Encryption Protects—and What It Doesn’t

End-to-end encryption can keep message content away from networks, service providers, and compromised delivery servers. It does not make endpoints, recipients, metadata, or backups automatically safe.

Read the article
SECURE COMMUNICATION, EXPLAINED

How we publish

The same editorial standard applies to every article in the Knowledge Center.

01

Primary sources first

Standards, technical documentation, research papers, and first-party product materials support factual claims.

02

Limits stated plainly

Security controls are described with their boundaries, assumptions, and tradeoffs—not as magic.

03

City of Hats in context

Each article explains how City of Hats handles the issue and links to the relevant feature or trust page.

04

Human approval

Research and drafting may use automation; a named human reviewer approves every publication.

SECURE COMMUNICATION, EXPLAINED

What we will cover

Encryption fundamentalsIdentity & metadataSecure messaging threatsPrivacy engineeringPost-quantum securitySource-backed comparisons

Need product instructions?

The Knowledge Center explains security concepts. The Knowledge Base contains practical City of Hats setup and usage help.

Open the Knowledge Base