This study proposes a confidential information hiding system for smartphones operating in cloud computing environments. Confidential information or files are transferred to cloud servers to be processed for information hiding by altering the sorting sequence of HTML tag attributes. In this study, two web pages are used as secret-embedded camouflage pages. We use the cloud environment computing capabilities to pair the relative tag attributes between two HTML files to achieve the fast and high-hiding capacity confidential data security protection. In addition, transmission of confidential information between smartphone clients and cloud servers is encrypted to improve data security during transmission. Designed using cloud computing environment architecture, this system performs faster than single-computer-based systems. The increase of the cloud server deployment also increases the processing speed and the secret hiding volume capacity of this system.