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Before you can encrypt and decrypt messages by using symmetric encryption, both the encryptor and decryptor must have the same key. You can t use just any piece of data as a key, however. Symmetric encryption algorithms must use keys of a specific length, as listed earlier in Table 8-1. Therefore, you cannot simply set the Key property to a user-provided password. You can, however, generate a valid key based on a user-provided password. Alternatively, you can use the randomly generated, highly secure key automatically created by the .NET Framework. If you rely on the .NET Framework to generate an encryption key for you, you must ensure that the key is transferred to the decryptor as securely as possible. In the sections that follow, you will first learn to visually display keys to make experimenting with encryption simpler. Then you will learn to generate a random key. Finally, you will learn the guidelines, process, and technique for generating a symmetric key based on a password.

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' VB Dim filePermissions As FileIOPermission = _ New FileIOPermission (FileIOPermissionAccess.Write, _ "C:\Inetpub\NewFile.txt") filePermissions.Assert Try Dim newFile As StreamWriter = New StreamWriter _ ("C:\Inetpub\NewFile.txt") newFile.WriteLine("Lesser privileged applications can save a file.") newFile.Close Finally CodeAccessPermission.RevertAssert End Try // C# FileIOPermission filePermissions = new FileIOPermission(FileIOPermissionAccess.Write, @"C:\Inetpub\"); filePermissions.Assert(); try { StreamWriter newFile = new StreamWriter(@"C:\Inetpub\NewFile.txt"); newFile.WriteLine("Lesser privileged applications can save a file."); newFile.Close(); }

In the Send a File dialog box, click the name of the contact with whom you want to share the file, and then click OK. In the Send a File dialog box, browse to the My Documents\Microsoft Press \Windows XP for Laptops and Tablets\Working\SendingFiles folder, click Cat, and then click Open. MSN Messenger sends a message to the contact asking him or her to accept the file. When he or she accepts, a progress bar appears that indicates the transfer progress of the file.

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Lesson 3: Personalizing Office Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

' VB Dim nv As NameValueCollection = nv.Add("First", "1st") nv.Add("Second", "2nd") nv.Add("Second", "Not First") Dim x As Integer For x = 0 To nv.Count- 1 Step Console.WriteLine(nv(x)) Next ' 1st ' 2nd,Not First New NameValueCollection()

Check physical network connections. Troubleshoot installed networking hardware. Troubleshoot modem hardware.

d. Look at the Options field in each DHCP message. Which two DHCP messages include client configurations for the Domain Name, Router, and Domain Name Server options

Exception logging It is quite common for a developer to want to log an exception at the point that it happened. To satisfy this requirement, the application block provides a method that will log the exception and then indicate whether it needs to be propagate further up the call stack. Also, through the logging mechanism, the different routing options (log file, Event Log, database, and so on) become available.

4. Open the file C:\PracticeMailboxSize in Notepad. 5. Manipulate the data by inserting tab characters so that it lines up in columns. This process should result in a file that looks similar to Figure 11-34.

Before you begin this chapter, you should have a basic familiarity with working in a Windows-based operating system. To complete the practices in this chapter, you must have a computer on which you can install Windows XP Professional.

3. You have completed designing your perimeter network for your company and now need to document the system for improved maintenance and support. What should your documentation include

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