In an ever-increasing competitive environment, companies must maintain the quality of their production and services. Hence, machinery or equipment that is critical to production and providing services must be maintained with minimum downtime or a near zero-break down rate. The concept of Web-based maintenance helps to detect faulty equipment at an early stage without the constraints of distance. It provides a convenient platform for maintenance personnel to evaluate the performance of machines even when they are distant. As the Internet is an open environment, its traffic or on-line communication can be easily intercepted. Users who do not adequately protect their Internet communication are exposed to risk. This paper intorduces a Web-based maintenance system with security considerations. With the assistance of several security measures, the data security of our Web-based maintenance system has been enhanced. The data can be transferred safely and the accuracy of the results can be verified. Our Web-based maintenance system works more securely in comparison to conventional Web-based maintenance systems that have been reported thus far.