Abstract
As an open source server-side scripts language, PHP is used more and more widely by Web developers now. Protecting PHP code from being plagiarized is also a hot research issue especially with the rapid development of dynamic web industry and people’s copyright protection consciousness. Usually the developers use PHP encoders to encrypt the PHP codes before selling them out. There are several different kinds of PHP encoders with different performances. In this paper, we analyze and compare the security level of some well-known encoders. From a fully new aspect, we try to analyze the output of the encoders with the random statistical tests, which is never done before. Also, we demonstrate the soundness of our method. We figure out the test suite which is most suitable for PHP encoders and explain the reasons. Finally, we carry out the experiments and draw a conclusion about the security of the PHP encoders based on our results
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