File Encryption Script Update on Bluehost

I need an experienced developer to update my file encryption script (scrypt) to the latest version without disrupting user data. The script is already updated, but I need it uploaded to the new version and hosted on the first version.

Key Requirements:
- Ensure all current features are retained, including:
- User authentication
- Data recovery
- Access logs
- Expert knowledge in file encryption
- Previous experience with Bluehost
- Ability to perform the task without affecting user data

Please note, this task needs to be handled delicately to maintain the integrity of user data and system functionalities.