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using System; namespace ProgrammingCSharpWeb { public partial class DisplayShippers : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e)

{

}

if (!IsPostBack) { rblShippers.SelectedIndex = 0; }

}

To decrypt the ciphertext to obtain the plaintext, we simply reverse the process. In our example ciphertext phhw ph dw fhqwudo sdun, the first letter is a p. Since the key is 3, it corresponds to an m in the plaintext. Even though Eve may be able to see the ciphertext message, she may not be able to decrypt the message if she does not know the key. However, the substitution cipher is a very old, easily breakable cipher, and is now used at most for children s games on the backs of cereal boxes. In most languages, English included, there is a natural frequency with which letters occur. For instance, even in the short message meet me at central park, the letter e is the most frequently appearing letter, followed by t. This happens to also be true for the text of the US Declaration of Independence and the text of this book. Given the natural frequency of letters in the English language, an attacker could determine the key for a substitution cipher by figuring out the most frequently appearing letter in the ciphertext and counting the number of letters between it and e. The attacker can verify her hypothesis by also counting the number of letters between the second most frequently appearing letter and t. A good encryption algorithm should not be vulnerable to such statistical attacks that try to exploit frequencies or patterns of letters in ciphertext. A good encryption algorithm produces text that appears completely random, in which each letter is just as likely to appear as any other letter, regardless of the contents in the plaintext. At the bit level, the probability that any particular bit is either 1 or 0 in the ciphertext should be 1/2 for a good encryption function.

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Listing 7-9. GetItems JavaScript Function Prototype // Pass the requested url to base class function and get the formatted XML. RSSClass.prototype.getItems = function (url){ // Retrieves items from the specified RSS feed. // // url (required): The URL of the RSS feed. this.__checkValidation(url); var returnResponse = environment.getXml(url); return this.__formatResponseDataRSSItem(returnResponse); };

}

protected void btnOrder_Click(object sender, EventArgs e) { lblMsg.Text = "Thank you " + txtName.Text.Trim() + ". You chose " + rblShippers.SelectedItem.Text + " whose ID is " + rblShippers.SelectedValue; }

Summary

In this chapter, we saw how to create a simple ASP.NET web application using Web Forms. We bound a list of radio buttons to a database table, and added server-side event handlers that respond to a user s interaction with a web page.

In this section, we briefly cover some notation that we will use in this and in following chapters. We use m to denote plaintext, and c to denote ciphertext. We also use F and F 1 to refer to mathematical functions for encryption and decryption, respectively. We use k to denote the key. The encryption function F requires a plaintext message, m, and an encryption key as input, and produces a ciphertext message c as output. We denote the relationship between the encryption function, the plaintext, the ciphertext, and the key as F(m,k) = c. The decryption function F 1 requires a ciphertext message, c, and a decryption key as input, and produces a plaintext message as output. Similarly, F 1(c,k) = m. A symmetric cipher is an encryption and decryption function for which F 1(F(m,k),k) = m. If Alice wants to send m to Bob confidentially, she computes c = F(m,k), and then sends c to Bob. When Bob receives c, he computes m = F 1(c,k). The cipher is said to be symmetric because the same key is used for both encryption and decryption.

Windows Forms offers a way to build Windows desktop applications using the NET Framework This may sound rather familiar if you re reading the chapters in order surely WPF does that The two technologies do overlap, but they work very differently Windows Forms is essentially a wrapper around the classic Win32-based UI: when you create a Windows Forms text box, you get an ordinary Windows text box with a NET wrapper That s not true in WPF in order to escape the limitations of the Win32 UI its controls are all rebuilt from scratch So while they go to great lengths to look and behave like their Win32 counterparts, they re not based on them (And Silverlight can run on Mac OS X, so it s clearly not dependent on any of the Windows common controls either.

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