You cannot unlock WhatsApp encryption directly as it is designed to secure it. However, to access your encrypted messages: 1. Make sure you have your phone number and WhatsApp account. 2. Use your device's biometric or passcode unlock. 3. Restore a backup from Google Drive (Android) or iCloud (iOS) if you have one. Remember, WhatsApp encryption is end-to-end, meaning only you and the recipient can read the message.