【導(dǎo)讀】本畢業(yè)設(shè)計(jì)研究的是DES算法實(shí)現(xiàn)及應(yīng)用。選擇該課題的意義在于：為了防。止信息不被非法訪問或竊取,實(shí)現(xiàn)達(dá)到該目的功能軟件。DES算法是對稱的加密。算法，具有速度快，執(zhí)行效率高等優(yōu)點(diǎn)，它是由IBM公司研制的一種加密算法.塊.保密通信模塊提供了一個(gè)基于C/S結(jié)構(gòu)的保密通信示例。了對DES算法的加解密演示功能。文本文件加密模塊提供了對文本文件加密并保。密接口和一個(gè)解密接口，對其進(jìn)行了封裝，以便在其他場合可以提供加解密功能。事件類型執(zhí)行不同的功能模塊。程負(fù)責(zé)處理加密消息的發(fā)送，接收線程負(fù)責(zé)處理加密消息的解密和顯示。用場合示例演示，實(shí)現(xiàn)方式和方法以及在此過程中運(yùn)用到的計(jì)算機(jī)知識。所編寫的程序?qū)崿F(xiàn)了本文的描述。

　　

【正文】 d(請輸入你的密鑰最大 4 個(gè)漢字或者 8 個(gè)英文字母 ,16)。 (this)。()。lab=new Label(輸 入你的密鑰 :)。 confirm=new Button(確定 )。 cancel=new Button(取消 )。(this)。 (this)。(lab)。(text)。(confirm)。(cancel)。add(p)。 validate()。 addWindowListener(new WindowAdapter() { public void windowClosing (WindowEvent e) {dispose()。} })。} //constructor public void actionPerformed(ActionEvent e) {if(()==confirm){ if(().trim().length()8{ (this, 你 的 輸 入 超 過 范 圍 默 認(rèn) 取 前 4 位,Warning,)。 =().trim().substring(0,4)。 dispose()。 }else 圖 34 簡單密匙管理功能模塊 第 21 頁 共 23 頁 {=().trim()。 dispose()。}} if(()==cancel){dispose()。}}}//class 結(jié) 論 本文首先介紹了密碼學(xué)的發(fā)展，密碼學(xué)的分類，以及不同體制下密碼算法的不同運(yùn)用情形和運(yùn)用場合和各自的優(yōu)缺點(diǎn)。其后又針對本文的任務(wù) 詳細(xì)介紹了DES 算法原理，實(shí)現(xiàn)方式，運(yùn)用場合，應(yīng)用背景，主要的流程等。數(shù)據(jù)加密是防止機(jī)密信息不被竊取和非法訪問的一個(gè)重要手段 ,是密碼學(xué)的主要內(nèi)容。文中分析了 DES 算法的基本原理 ,通過對本課程設(shè)計(jì)的實(shí)現(xiàn)，系統(tǒng)的了解了如何根據(jù)需要構(gòu)造一個(gè)可執(zhí)行的軟件實(shí)現(xiàn)，實(shí)現(xiàn)方式，處理流程，在其中系統(tǒng)的運(yùn)用計(jì)算機(jī)相關(guān)知識達(dá)到工程實(shí)際的需要，以及在遇到問題時(shí)如何尋求一個(gè)合理的解決途徑和解決方案，為以后步入社會(huì)參加實(shí)際工作做好準(zhǔn)備和鋪墊 。 參考文獻(xiàn) [1] 耿詳義． JAVA2實(shí)用教程 [M].北京：清華大學(xué)出版社， 2020。 [2] Anonymous．網(wǎng)絡(luò)最高安全技術(shù)指南 [M].北京：機(jī)械工業(yè)出版社， 1998。 [3] 陳魯生．現(xiàn)代密碼學(xué) [M].北京：科學(xué)出版社， 2020。 [4] 劉文濤．網(wǎng)絡(luò)安全開發(fā)包 [M].北京：電子工業(yè)出版社， 2020。 [5] 羅朝盛 . Visual basic 程序設(shè)計(jì)教程 [M]. 北京：人民郵電出版社， 2020。 [6] 曹衍龍 . Visual basic [M]. 北京：人民郵電出版社， 2020。第 22 頁 共 23 頁 致 謝 本次課題在完成過程中得到了來自各方面的支持。在此我要特別感謝 我的指導(dǎo)老師劉永紅老師和韓斌老師。在我的設(shè)計(jì)過程中他給了我很多的理論和實(shí)際指導(dǎo)，給了我很大的支持，使得本次設(shè)計(jì)能夠順利完成。還要感謝在設(shè)計(jì)過程中給予我極大幫助的我的好朋友和好同事，正是有了他們的幫助本次設(shè)計(jì)能夠取得較好的效果。 最后向在百忙之中評審本文的各位專家、老師表示衷心的感謝！ 作者簡介 姓 名： 田大勇 性別： 男 出生年月： 19830607 民族： 漢 Email: 第 23 頁 共 23 頁 聲 明 本論文的工作是 2020年 2月至 2020 年 6月在成都信息工程學(xué)院 網(wǎng)絡(luò)工程 系完成的。文中除了特別加以標(biāo)注地方外，不包含他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得成都信息工程學(xué)院或其他教學(xué)機(jī)構(gòu)的學(xué)位或證書而使用過的材料。除非另有說明，本文的工作是原始性工作 。 關(guān)于學(xué)位論文使用權(quán)和研究成果知識產(chǎn)權(quán)的說明： 本人完全了解成都信息工程學(xué)院有關(guān)保管使用學(xué)位論文的規(guī)定，其中包括： （ 1）學(xué)校有權(quán)保管并向有關(guān)部門遞交學(xué)位論文的原件與復(fù)印件。 （ 2）學(xué) ?？梢圆捎糜坝　⒖s印或其他復(fù)制方式保存學(xué)位論文。 （ 3）學(xué)校可以學(xué)術(shù)交流為目的復(fù)制、贈(zèng)送和交換學(xué)位論文。 （ 4）學(xué)?？稍试S學(xué)位論文被查閱或借閱。 （ 5）學(xué)?？梢怨紝W(xué)位論文的全部或部分內(nèi)容（保密學(xué)位論文在解密后遵守此規(guī)定）。 除非另有科研合同和其他法律文書的制約，本論文的科研成果屬于成都信息工程學(xué)院。 特此聲明！ 作者簽名 : 年 月 日 第 24 頁 共 23 頁 Anyway, I was here in Amber some years ago. Not doing much of anything. Just visiting and being a nuisance. Dad was still around, and when I noticed that he was getting into one of his grumpy moods, I decided it was time to take a walk. A long one. I had often noticed that his fondness for me tended to increase as an inverse function of my proximity. He ga ve me a fancy riding crop for a goingaway presentto hasten the process of affection, I suppose. Still, it was a very nice cropsilverchased, beautifully tooledand I made good use of it. I had decided to go looking for an assemblage of all my simple pleasures in one small nook of Shadow. It was a long rideI will not bore you with the detailsand it was pretty far from Amber, as such things go. This time, I was not looking for a place where I would be especially important. That can get either boring or difficult fairly quickly, depending on how responsible you want to be. I wanted to be an irresponsible nonentity and just enjoy myself. Texorami was a wide open port city, with sultry days and long nights, lots of good music, gambling around the cloc k, duels every morning and inbetween mayhem for those who couldn39。t wait. And the air currents were fabulous. I had a little red sail plane I used to go sky surfing in, every couple of days. It was the good life. I played drums till all hours in a basement spot up the river where the walls sweated almost as much as the customers and the smoke used to wash around the lights like strea ms of milk. When I was done playing I39。d go find some action, women, or cards, usually. A nd that was it for the rest of the night. Damn Eric, anywayl That reminds me again . . . He once accused me of cheating at cards, did you know that? And that39。s about the only thing I wouldn39。t cheat at. I ta ke my card playing seriously. I39。m good and I39。m also luc ky. Eric was neither. The trouble with him was that he was good at so many things he woul dn39。t admit even to himself that there were some things other people could do better. If you kept beating him at anything you had to be cheating. He started a nasty argument over it one nightcould have gotten seriousbut Gerard and Caine broke it up. G ive Caine that. He took my part that time. Poor guy . . . Hell of a way to go, you know? His throat . . . Well, anyhow, there I was in Texorami, making music and women, winning at cards and jockeying around the sky. Palm trees and nightblooming wallflowers. Lots of good port smellsspices, coffee, tar, saltyou know. Gentlefolk, merchants, and peons the same straights as in most other places. Sailors and assorted travelers passing in and out. Guys like me living around the edges of things. I spent a little over two years in Texorami, happy. Really. Not much contact with the others. Sort of postcard like hellos via the Trumps every now and then, and that was about it. Amber was pretty much off my mind. All this changed one night when I was sitting there with a fu ll house and the guy across from me was trying to make up his mind whether or not I was bluffing. The Jack of Diamonds began talking to me. Yes, that is how it started. I was in a weird frame of mind anyway. I had just finished a couple very hot sets and was still kind of high. A lso, I was physically strung out from a long day39。s gliding and not much sleep the night before. I decided later that it must be our mental quir k associated w ith the Trumps that made me see it that way when someone was trying to reach me and I had cards in my handany cards. Ordinarily, of course, we get the message empty handed, unless we are doing the calling. It could have been that my subconsciouswhich was