In order to provide a good practice platform for the program design contestants and algorithm enthusiasts, this paper designs and implements a programming online evaluation system based on cloud platform, which is a web system that can return the test results of the program source codes submitted by users in real time. It realizes the automatic evaluation of the program design training questions. The system is implemented by the way of front-end and backend separation and modular programming. The front-end of the web is implemented by Vue framework, the back-end is implemented by Django framework. The judgment core is written in C language for the sake of improving the efficiency of the system. Sandbox technology is used to ensure the security of the judgment system. Experimental results show that the system can meet the need of daily teaching and competition.

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It is a difficult issue in the anti-virus field about how to detect unknown and packed PE (Portable Executable) viruses effectively, and existing schemes for anti-virus detection are dissatisfactory. Based on an analysis of the logical structures of Windows PE file and PE virus, a new method of PE virus detection is presented here, which exploits fragile software watermarking technique for virus detection. It describes how the new scheme embeds a software watermark into the PE files for virus detection. The experiment shows that the new method has a higher rate in detecting unknown PE virus than some existing ones, and can detect directly the packed PE virus.

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