Design Of Secure Computer System Based On VxWorks

With the development of science and technology, and amplification of sphere of activity for people, the human pursuit of safety and reliability is rising day by day. Especially in the fields of aviation, railroad, rail transit, maglev, safety requirements more stringent. VxWorks is a high-performance real-time embedded operating system developed by theU.S. Windriver. It is widely used in the field of defense, aerospace, communications, consumer electronics, industrial control, automotive electronics and others.According to the field of computer fault tolerance and redundancy, and the the numbers of I/O ports, we design of two different secure computer architecture. And we carried out a detailed design of each program. The first architecture has one output port only, and the second one has three output ports. The software design includes a three-channel synchronization module, receiver module and sending module. For the three modules of the software part of the paper, we designed three different programs of two out of three. And we carried out a detailed design of each program. For synchronization module, every channel will compare with the other two channels, and then gets synchronization status of channels. For the module of sending serial port messages, every channel will compare with the other two channels selectively according the results of comparing. For the module of receiving serial port messages, every channel will compare with the smaller of the other two channels.The design of the three channels for security computer voting system fully performs the same procedure. And the system can fully shield fault signal through two out of three fault-tolerant modes. So the signal security is improved greatly. Finally we build the embedded software test platform. We write test software in the PC and test the entire voting system in lower machine. Through tested, we ensure that the three ways can ensure the security of packet transmission and data operations. And the result proved that the design has high security and reliability. And the result achieves the desired design goal. The overall system makes research guidance for security computer, provides a good design reference for the majority of staff for development and design.