基于DES加密算法的WORD加密插件的實現

論文字數:9179,頁數:24

摘  要
隨著社會發展，社會進入信息時代。信息技術和信息產業正在改變傳統的生產﹑經營和生活方式，信息已成為社會發展的重要戰略資源。如今，Office辦公文檔已是日常辦公生活中不可缺少的一部分，與此同時伴隨而來的信息安全問題也日益突出。如何確保Word文檔中的內容不被未授權的第三方所知，防止重要信息被隨意改動，成為當務之急。如果在Word工具欄中添加一個加密插件，可以對文檔全部內容或部分內容加密，便能有效防止信息泄漏。
本論文采用VB編寫Word插件，通過采用Windows下的動態鏈接庫技術（DLL），在VC中把DES算法封裝起來做成DLL模塊供VB調用，實現了開發加密插件時對加密函數的調用，提高了加密算法的效率。通過使用該插件在Word中添加的工具按鍵，便能簡單有效地對文檔內容加解密，使用戶在操作WORD文檔時更加方便安全。

關鍵詞：加密插件；信息安全；COM組件；動態鏈接庫

The Implementation of a Word Adding for Encryption Based on DES Encryption Algorithm
Abstract
With the development of the society, we are entering the information times. The traditional method of the product, the management and our life style are changed by the information technology and the information industries. The information has become the important strategic resources for the society development. Now, the Office documents have already become an essential part in people’s daily work, followed with this, the question of information security becomes critical day by day at the same time. How to prevent the content in the Word documents from being known or modified by the unauthorized third party has become an urgent issue. If we can add an encryption plug-in into the word toolbar, which is able to encrypt all or part of the Word document, the information leaking could be prevented efficiently.
The Word adding introduced in this paper is developed with VB, which calls the encryption and decryption functions in a Dynamic Link Library (DLL) that is developed with VC to enhance the efficiency of the encryption algorithm. By using this adding, users can encrypt or decrypt word document locally without leaving the Word.

Key words: Encryption plug-in unit; Information security; COM module; DLL

目  錄

1 引言 1
1.1選題背景 1
1.2選題意義 1
2理論基礎 2
2.1 DES算法描述 2
2.1.1  DES算法框圖 2
2.1.2  DES解密 3
2.1.3  DES算法原理 3
2.2  COM組件簡介 5
2.2.1 組件 5
2.2.2 接口 6
2.2.3 創建 7
2.2.4 復用 8
2.3  插件簡介 8
3 需求分析和方案設計 8
3.1 需求分析 8
3.1.1功能需求 8
3.1.2 開發環境 9
3.2 方案設計 10
4 程序的實現 10
4.1  VC建立DES算法模塊 10
4.1.1 加密導出函數的定義 11
4.1.2解密導出函數的定義 11
4.1.3加解密相關函數的聲名 11
4.2  VB編寫WORD插件 12
4.2.1建立Word插件工程 12
4.2.2 Word代碼的編寫 14
5 測試 16
結    論 17
參考文獻 18
致    謝 19
聲    明 20