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Generate symmetric encryption keys from a password when you rely on users to transfer the secret key The biggest challenge of using symmetric encryption is securely transferring the shared secret between the encryptor and decryptor Reading a 128-bit key (32 characters when expressed in hexadecimal) over the phone is time consuming and error-prone People are, however, accustomed to exchanging passwords over the phone Passwords are often a single word or a phrase; however, the best passwords are random numbers, letters, and other characters Even the most complex random password will still be easier to exchange than a 128-bit (or longer) key Unfortunately, unless it is a very, very long password, it will also be less secure Although an attacker would need to attempt a maximum 2128 encryption keys to find a 128-bit encryption password, a 10-character complex password would require only about 256 combinations.

security.Tokens.Add(userToken);

registers its user name, domain name and, depending on the operating system version, any services it may be running. Windows XP clients that are WINS-enabled usually register more NetBIOS names than other WINS-enabled clients. Windows XP clients can register names for the Server service, the Replicator service, Messenger service, the Computer Browser service, and additional services. Figure 7-6 illustrates the WINS database entries for a WINS-enabled client workstation running Windows XP.

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Furthermore, because most passwords are not cryptographically random, the attacker could further reduce the number of guesses required by using a password dictionary You cannot directly use passwords as encryption keys, but you can use the SystemSecurityCryptographyPasswordDeriveBytes class to turn a password into a key This is particularly useful when a shared secret has already been established between an encryptor and a decryptor For example, if you create a custom authentication mechanism and your application is privy to the user s user name and password, you could concatenate the user s own user name and password to derive the same key at both the encryptor and decryptor PasswordDeriveBytes requires three values in addition to the user s password: a salt value, an initialization vector, and the number of iterations used to generate the key Ideally, all these values are randomly generated.

private void secureMethod()

Changing any of these values produces a different key, requiring you to use the same values at both the encryptor and.

1. Log on to Computer1 as Administrator. 2. Open the Network Connections window. 3. If the MyISP connection is active in the Network Connections window, right-click MyISP and select Disconnect. 4. After the dial-up connection has finished disconnecting, right-click MyISP and select Properties. The MyISP Properties dialog box opens. 5. Click the Advanced tab. 6. In the Internet Connection Sharing area, select the Allow Other Network Users To Connect Through This Computer s Internet Connection check box. 7. Click OK. The Network Connections dialog box opens. 8. Read the text in the box, and then click Yes. At this point, the local computer is assigned an IP address of 192.168.0.1. You might temporarily lose network connectivity while these changes are being made. 9. Log on to Computer2 as Administrator. 10. Restart Computer2.

1. Which of the following are required to start a background process with the Back groundWorker component (Choose all that apply.) A. Calling the RunWorkerAsync method B. Handling the DoWork event C. Handling the ProgressChanged event D. Setting the WorkerSupportsCancellation property to True 2. Which of the following are required to cancel a background process with the BackgroundWorker component (Choose all that apply.) A. Set the WorkerSupportsCancellation property to True. B. Implement code to actually stop the process. C. Call the CancelAsync method. D. Set the CancellationPending property to True. 3. Which of the following are required to report the progress of a background pro cess with the BackgroundWorker component (Choose all that apply.) A. Call the ReportProgress method. B. Handle the ProgressChanged event. C. Poll the IsBusy property. D. Set the WorkerReportsProgress property to True.

Personal computer with a 600 MHz Pentium III compatible or faster processor; 1 GHz or faster processor recommended 512 MB of RAM or more; 1GB or more recommended 8 GB of available hard disk space

1. Open your completed lab from Lesson 1 or load the Lab 1 solution from the folder on the companion CD. 2. Open Form1. In the Designer, drag a MenuStrip control from the Toolbox to the top panel of the ToolStripContainer. 3. Add a top-level tool strip menu item named &File to the menu strip. 4. Add the following sub-menu items to the File tool strip menu item: &Open, &Print, P&rint Preview, &Save, and &Exit. 5. From the Toolbox, drag an OpenFileDialog component onto the form. 6. In the Designer, double-click OpenToolStripMenuItem to open the code window to the OpenToolStripMenuItem_Click event handler. Add the following code to this method:

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