论文摘要翻译成英文，谢绝用翻译软件翻译的结果！！！

Graduate management in the school is very important, including the title, leading teacher in the topic title verification, students choose, and later the thesis management, defense, etc. Scores Based on this, a red graduate management information system can greatly improve the efficiency of management and provide convenience for the teachers and students of the service. Along with the rapid development of Internet technology, network information management mode become the urgent demand of the graduate management and application service provider (ASP) is a kind of applicable mode. It is based on the main characteristics of a more remote wan service provides basic pattern is B/S structure of thin client, fat, can pertinently server to solve the current problems in the management of graduation. This model not only means the use efficiency of graduation of information management, management fee, and brought the lower internal and external information communication means a major change in work process, management mode, organization structure bring teachers classmate great convenience.
Based on the analysis of ASP, under the precondition of information engineering college by the school as the research object, the graduate management based on ASP under the mode of system structure and function modules are discussed and analyzed. Main job is as follows:
1 the graduate management of general analysis of demand. Which function requirement should be focused on three aspects: school leadership, teachers and students. General process for teachers to submit questions directly by the school leadership, approved by the teachers and students free choice dissertation5 topic. Thesis papers to upload bernal upload to the thesis, teachers and students to download, evaluation of teachers in communication, etc.
2 discusses the mode of system structure and key technology, the thesis adopts B/S model of three layer structure, select the active server pages, and Server2000 SQL database server IIS for key technology.
3 the main function division system structure, main have personnel management, project management, scientific research and management, management, public announcement, and meticulous news management module are analyzed and the data flow, the working process of the system, the more specific functions clearer with maneuverability.
The paper also discussed some disadvantages, but overall, this system for general school graduate management has certain theoretical and practical value.

Abstract

This article summarizes research on cryptology and the interrelated theoretics, especially focus on the famous DES(short for Data Encryption Standard) algorithm. To make the reserch clear and concrete,this article also gives a direction in how to develop a “DES Encoding and Decoding System” using Matlab.
There are three major part in this article.In the first part, the author introduced the history of cryptology and some basic theoretics in this field, including several classical encoding algorithm and how to analyse the secutity of certain given encoding algorithm. In the second part, the article go deep into DES algorithm, the focus including where does DES come from, how to implement a DES algorithm, comparison between DES and RSA, the security analysis of DES, S-box , and the improvement of DES. In the last part, the articale gives a step by step direction in how to develop a “DES Encoding and Decoding System” using Matlab.
After reading and studying this article, you will be clear about how the DES algorithm works and how to develop a software using DES algorithm. And also you will get the idea that the DES algorithm is still playing an important part in the information security industry, and the DES algorithm affect a lot the designing of encoding algorithm.

Key Words: Information security Public-key cryptosystem Cryptology DES Matlab

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