> ## Documentation Index
> Fetch the complete documentation index at: https://support.locker.io/llms.txt
> Use this file to discover all available pages before exploring further.

# How Does Locker Keep My Data Secure in the Event of a Cyberattack?

> Even if Locker's servers are compromised, your data remains safe thanks to the Zero-Knowledge encryption model.

Thanks to its **Zero-Knowledge** architecture, even if Locker's servers are attacked, intruders cannot read your data.

## How Locker protects your data

1. **Client-side encryption:** All data is encrypted on your device **before** being sent to the server. The server only stores encrypted data.
2. **Master Password never leaves your device:** The encryption key is generated from your Master Password on your device and is never sent to the server.
3. **AES-256-CBC encryption:** The strongest encryption standard available today — it would take billions of years to crack using brute-force methods.
4. **PBKDF2 hashing:** Your Master Password is hashed through multiple iterations before use, protecting against dictionary attacks and rainbow tables.

## If the server is compromised

An attacker would only obtain encrypted data — essentially a meaningless string of characters. Without the Master Password, the data cannot be decrypted.