论文总字数：24872字

摘 要

近年来网络科技飞速发展，互联网科技移动设备已经融入到我们生活无处不在，网络改变了生活方式。现在生活中地铁上公交上饭桌上许许多多的年轻人都手里一部手机俗称“低头族”，因为现在网络聊天软件已经越来越完美既可以表达心情结交友谊联系感情也可以拓展人脉网上在做生意、阅读新闻、通信手段、了解他人的近况动态，目前伴随着我们中学时代一直发展到今天的QQ(企鹅)几乎每个手机一族都有一个账号，这个账号就像是茫茫网络这个大海洋中一个人的标示。

进入新世纪的高速社会，聊天软件绑定了个人的生活圈子个人的隐私身份信息等，所以QQ密码变得越来越重要，我们知道事物的发展都有两面性，科技的发展既给人类生活带来了便捷业也带来了网络诈骗等。当你得qq密码忘记了或被非法分子窃取了，你得个人信息将会泄露，同时他人也可以以你的名义进行传播信息，目前伴随着qq上增添了越来越多的功能所以一旦忘记可能要非常麻烦，突然感觉一下子丢失了所有的联络，即使设置过了回答问题等，但一个帐号伴随着我们长年累月时间久了自己都回不记得，一时无法登录帐号会心情会很急躁。

在过去17年间腾讯QQ用户注册量高达十几亿,有效用户也在5-6亿左右,这也符合目前中国的网民数量而且这个数字还在每年激增，伴随着qq的发展催生了许多附加价值比如黄钻、会员、绿钻、广告、有戏币、购物、吃喝玩乐、同城服务等等，由CCID发布的“中国互联网行业最强者在线调查报告”中，“创造社会价值最大”、“社会影响力最大”、“最能创造社会价值”、“股票最有投资价值”、“竞争优势最大”、“未来五年内能竞争取胜”、“企业领导社会影响力最大”等项中，腾讯均居第一，如今的QQ，已经成为一种新兴的沟通方式和文化现象，正在潜移默化而又深刻的改变着人们的思想和生活。而且QQ每年都有升级版本功能越来越强大，这必然使得QQ账号更有价值和人们生活更分不开，一旦密码忘记登录不上qq将是万分着急，在有了一个可以破解密码的软件后，一旦密码忘记可以随时找回，解决急事避免了因为失去许多联系方式和其他损失。

本论文设计的应用软件是以MyEclipse作为集成开发的环境，以JAVA语言作为系统开发的实现语言。

关键词 ：加解密算法； JAVA；MD5

Abstract

In recent years the rapid development of Internet technology, Internet technology for mobile devices has been integrated into the everywhere of our lives, the Internet has changed the way of life. Now living in the subway on the bus on the table Xu many young people are in the hands of a cell phone is commonly referred to as the "bow to the family", because now the network chat software has been more and more perfect not only can express feelings make friendship relationships can also be expanded online connections in business, read news, means of communication, understanding others present. At present, along with our high school age has been developed to today"s QQ (Penguin) almost every mobile phone owners have an account and the account as is the vast network in the ocean of one mark.

Enter new century high society, chat software is bundled the personal life circle of personal identity privacy information, so the QQ password becomes more and more important, we know that the development of things have two sides, the development of science and technology both to human life brought convenient industry also brings the network fraud. When you have QQ password is forgotten or stolen by criminals, you have personal information will be leaked, and others can also spread information in your name, with the QQ add more and more so once forget may be very troublesome, all of a sudden feeling of all of a sudden lost all contact, even if set before answering questions, but an account with us through the months and years long themselves are not remember, temporarily unable to login account will mood will be very impatient.

If you want to elect a can change in China in the 21st century communication life of "made in China" products, so Tencent"s QQ "at the forefront of the candidate. In the past 15 years, Tencent QQ registered users up to ten million, effective users at around 5-6 million, which is consistent with the current number of Internet users and the number is China year surge, along with the development of QQ has spawned many additional value such as membership, green diamond, yellow diamond, advertising, games, shopping, idle away in seeking pleasure. City services, etc., issued by the CCID "China Internet industry best online survey report", "the creation of social value", "social influence", "the most able to create social value", "the stock investment value", "advantage", "the next five years to win the competition", "enterprise leading social influential" in Tencent, ranking first, now QQ, has become a new way of communication and cultural phenomenon, and is influence character by environment of profound changes in people"s life and thought. And QQ every year has upgraded version of the function is more and more powerful, it is inevitable to make QQ account more value and people"s lives more inseparable, once the password forget not log on QQ will be very anxious, with a password cracking software, once the password forget can always get back to solve urgent avoid because of the loss of many links and other losses.

In this paper, the design of application software is based on MyEclipse as integrated development environment, the Java language as system development language

key words：Encryption algorithm;java;MD5

目 录

摘 要 I

Abstract II

第一章 绪 论 2

1.1课题背景 2

1.2研究意义 3

1.3研究内容 3

1.4设计思想 3

1.5组织结构 4

第二章 需求分析 5

2.1可行性分析 5

2.2功能需求 6

2.3性能需求 8

第三章 系统分析设计 9

3.1总体设计 9

3.2系统结构 12

第四章 详细设计与系统实现 14

4.1数据算法 14

4.2类之间关系 20

4.3程序设计考虑 25

第五章 系统测试 28

5.1测试环境 28

5.2测试方法与结果 28

5.3测试总结 29

结 论 30

致 谢 31

参考文献 32

第一章 绪 论

1.1课题背景

现在qq作为一个大众聊天软件几乎每人平均一个账号，所有的联系人朋友圈好友群都在上面，

有的人用它来交友，有的人用它来诉说心理话，有的人通过她谈恋爱，有的人用它来做生意联系生意伙伴，和人们联系很密切，实名认证让qq可以作为一种互联网身份所以一旦密码不记得可能会有很大损失。

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