This is my school, a job, use symetric key and the mac to a chat program to send the message encryption and decryption. Prepared using the c#. Stand-alone test, open the two instances in which a point and then listen, the other hostname fill localhost, and then point connection. 2 you can chat with each other to send information as well.

ChattingSystemWithSecurityFunction\chatting with security\Backup\Chat\App.ico
..................................\......................\......\....\AssemblyInfo.cs
..................................\......................\......\....\Chat.cs
..................................\......................\......\....\Chat.csproj
..................................\......................\......\....\Form1.cs
..................................\......................\......\....\Form1.resx
..................................\......................\......\....\Properties\Resources.Designer.cs
..................................\......................\......\....\..........\Resources.resx
..................................\......................\......\Chat.sln
..................................\......................\......\Chat.suo
..................................\......................\Chat.suo
..................................\......................\chatting with security\App.ico
..................................\......................\......................\AssemblyInfo.cs
..................................\......................\......................\chatting with security.cs
..................................\......................\......................\chatting with security.csproj
..................................\......................\......................\main.cs
..................................\......................\......................\main.resx
..................................\......................\chatting with security.sln
..................................\......................\UpgradeLog.XML
..................................\......................\_UpgradeReport_Files\UpgradeReport.css
..................................\......................\....................\UpgradeReport.xslt
..................................\......................\....................\UpgradeReport_Minus.gif
..................................\......................\....................\UpgradeReport_Plus.gif
..................................\kankan.docx
..................................\chatting with security\Backup\Chat\Properties
..................................\......................\......\Chat
..................................\......................\chatting with security\bin
..................................\......................\......................\obj
..................................\......................\......................\Properties
..................................\......................\......................\Resources
..................................\......................\Backup
..................................\......................\chatting with security
..................................\......................\_UpgradeReport_Files
..................................\chatting with security
ChattingSystemWithSecurityFunction

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