How does zero-knowledge encryption work?

Your password is used to generate an encryption key locally on your device. This key is used to encrypt your writing before it ever leaves your machine. Since we don't have your password or the derived key, we have zero knowledge of your data.

Does CipherWrite train AI on my writing?

Never. One of our core privacy principles is a 0% AI training policy. Because your writing is encrypted with keys only you hold, it is technically impossible for us to use your work for model training.

What happens if I forget my password?

Because we use zero-knowledge encryption, we cannot reset your password or recover your data if you lose it. Your password is the only key to your data.

Security & Trust

Your Words Are Mathematically Safe.

CipherWrite uses zero-knowledge encryption to ensure that nobody — not hackers, not governments, not even us — can read your writing.

Client-Side Encryption

All encryption happens on your device using AES-256 before data is transmitted. Your plaintext never leaves your machine.

Zero-Knowledge Architecture

Your encryption key is derived from your password using PBKDF2. CipherWrite never has access to your key or your unencrypted data.

No Data Harvesting

We do not scan, analyze, or mine your writing for advertising, analytics, or AI training. Your words are not a product.

Breach Resilience

If our servers were compromised, attackers would find only encrypted blobs. Without your password-derived key, your data is unreadable.

No Tracking or Analytics

We do not use Google Analytics, Facebook Pixel, or any third-party tracking scripts. Your browsing behavior on CipherWrite is private.

Open Security Methodology

Our encryption methodology follows established cryptographic standards. We are transparent about how we protect your data.

How It Works

1You type your words in CipherWrite's editor. Everything stays in your browser's memory.
2When saving, your password generates a unique encryption key using PBKDF2 — this key never leaves your device.
3Your text is encrypted with AES-256 on your device. Only the encrypted blob is transmitted to our servers.
4On another device, you enter your password → the same key is regenerated → your text is decrypted locally. We never see it.

Comparison with Other Apps

Feature	CipherWrite	Google Docs	Notion	Evernote
End-to-End Encryption	✅	❌	❌	❌
Zero-Knowledge	✅	❌	❌	❌
No Data Harvesting	✅	❌	❌	❌
No AI Training	✅	❌	⚠️	❌
Offline Mode	✅	⚠️	⚠️	✅

Have Security Questions?

Check our Help Center or read about why encryption matters for writers.

Start Writing Securely