The document describes a proposed Root Security Firewall (RS Firewall) application for Android devices. RS Firewall aims to improve Android security by monitoring other applications' network permission access and allowing the user to grant or revoke these permissions. It maintains a list of installed applications and their network permission status. The user can control network access through a simple checkbox interface. RS Firewall also logs application permission histories to help users identify and block potentially harmful permissions. It aims to provide more transparency and user control over how applications access the key vulnerability of networks on Android devices.