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Many of the cryptographic classes seen so far require a key containing random bytes. For obvious reasons, the more random the key is, the more secure the encryption. For a robust encryption mechanism, however, you can t just use the System.Random class to generate random keys because this class generates sequences of values that are reproducible and aren t random enough for cryptographic purposes. Instead, you should use the RNGCryptoServiceProvider class, which wraps the CryptoAPI library. Using this class to generate a random sequence of bytes is trivial:

After you format the characters and paragraphs in a publication the way you want them, you can adjust the layout to accommodate the text. In a brochure that is designed to be folded, you might nd that you need to continue text from a text box on one panel to a text box on a different panel. Publisher does not automatically ow text from box to box the way Word ows text from page to page. You have to explicitly link text boxes to tell Publisher where it should ow the text. This gives you control over the continuation of articles from page to page. You create and break links and move between linked text boxes by clicking the buttons on the Connect Text Boxes toolbar.

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Dim rng As New RNGCryptoServiceProvider Dim bytes(63) As Byte rng.GetBytes(bytes)

You can also explicitly request that no byte in the sequence be zero:

The range of items that you can add to your project depends on how many other Microsoft Visual Studio components you have installed You might have more items available than those shown in Figure 5-2 If you select the Sprite Font item, you can create a sprite font reference When you do this, you find that XNA Game Studio has filled in the Name information at the bottom of the dialog box with SpriteFont1spritefont This is the name that you use within your program to refer to this item of font content We are going to use this for now, but in later games, you might want to change it to a name that has a bit more meaning When Visual Studio builds the BigClockContent project, it reads an existing font on your Windows PC to build the SpriteFont that is used when the game runs.

Dim bytes2(1023) As Byte rng.GetNonZeroBytes(bytes2)

Another common way to generate a key to be used for encryption purposes is to derive it from a textual password. For example, you can ask your user for a readable password such as ILoveDotNet and your program generates a seemingly random sequence of bytes using some sort of transformation over each character in the string. This technique makes an attacker s job much harder while letting the end user use a human-readable password. You can easily transform a human-readable password into an apparently disordered sequence of bytes by means of a PasswordDerivedBytes object. The constructor for this object takes a string and a Byte array. This byte array is known as the salt and it has more or less the same purpose that initialization vectors have with symmetric encryp tion algorithms: they help hide any pattern in the input data.

If you want to arrange text in two or more columns, it is not necessary to create multiple text boxes: You can format a text box to display its contents in columns. To create columns, you click anywhere in the text box, click the Columns button on the Standard toolbar, and then click the number of columns you want (up to four). Publisher sets up the columns and ows the text from one to another automatically. To ne-tune a multi-column layout, right-click a column, click Format Text Box, click the Text Box tab, and click Columns to display the Columns dialog box. You can then change the number of columns and adjust the spacing between them. In the Columns dialog box, you can divide a text box into a maximum of 63 columns. To draw a line between the columns, on the Colors And Lines tab of the Format Text Box dialog box, click the No Lines button under Presets, and then click the Center Vertical Line button in the Preview area. You can then specify a line color, choose dotted, dashed, double, or triple lines, and specify the line thickness.

Dim Dim Dim Dim password As String = ILoveDotNet"

salt() As Byte = {3, 45, 78, 123, 9, 77}