Pretty Good Privacy is a kind of software used for Email encrypting. This paper expounds its algorithm and running principle. PGP's trust model and the functions of each component in PGP Message are analyzed. Meanwhile, the paper deeply illuminates the whole procedure of sending and receiving PGP message. In the end, PGP's applications are presented, and its security is briefly discussed.
Presently, the network teaching system has become very important teaching method in college. This paper discusses the development background of network video teaching service system. Web Service technology is used to change the video teaching platform in the background. It solves the problem that the colleges don't repeat development system, analyzes the function and performance requirements of the services provided by system, and designs the function module.
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