Zero-knowledge, explained without the jargon

You hear “zero-knowledge” everywhere. Here is what it actually means, what it protects you from, and what it cannot.

Zero-knowledge sounds like marketing. In practice it is a concrete property: we cannot read your data, even if we wanted to.

What the server sees

When you save something, it is encrypted on your device first. The server stores an opaque blob and never sees the key.

• Your keys are derived from a password only you know
• We hold a locked box, not its contents
• A breach of our database leaks ciphertext, not your life

If the company can read your data, a court, an employee or an attacker eventually can too.

What it does not do

Zero-knowledge protects content, not the fact that you have an account. And if you lose your password and recovery key, not even we can help — that is the trade-off.