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In this book, you ve seen several examples in which ASP .NET security works behind the scenes to protect your data. For example, in 20 you learned how ASP.NET uses encryption and hash codes to ensure that the data in the form cookie is always protected. You have also learned how you can use the same tools to protect view state. Unfortunately, ASP.NET doesn t provide a similar way to enable automatic encryption for the query string (which is the extra bit of information you add to URLs to transmit information from one page to another). In many cases, the URL query information corresponds to user-supplied data, and it doesn t matter whether the user can see or modify it. In other cases, however, the query string contains information that should remain hidden from the user. In this case, the only option is to switch to another form of state management (which may have other limitations) or devise a system to encrypt the query string. In the next example, you ll see a simple way to tighten security by scrambling data before you place it in the query string. Once again, you can rely on the cryptography classes provided with .NET. In fact, you can leverage the DPAPI. (Of course, you can do this only if you are not in a server farm environment. In that case, you could use the previously created encryption classes and deploy the same key file to any machine in the server farm.)

The starting point is to build an EncryptedQueryString class This class should accept a collection of string-based information (just like the query string) and allow you to retrieve it in another page Behind the scenes, the EncryptedQueryString class needs to encrypt the data before it s placed in the query string and decrypt it seamlessly on the way out Here s the starting point for the EncryptedQueryString class you need: public class EncryptedQueryString : SystemCollectionsSpecializedStringDictionary { public EncryptedQueryString() { // Nothing to do here } public EncryptedQueryString(string encryptedData) { // Decrypt information and add to // the dictionary } public override string ToString() { // Encrypt information and return as // HEX-encoded string } } You should notice one detail immediately about the EncryptedQueryString class: it derives from the StringDictionary class, which represents a collection of strings indexed by strings.

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One key feature of the MVC architecture, and of Django s slightly modified form, is the notion that sections of code that perform significantly different functions shouldn t know how the others operate. This is called loose coupling. Contrast this with tight coupling, where modules often rely heavily on the internal details of other modules implementations. Tight coupling causes a whole host of problems with long-term code maintenance, as significant changes to one section will invariably affect others. This creates a mountain of extra work for the programmer, having to change code that has little if anything to do with the work that needs to be done. This extra work is unfortunate for not only the programmer; it s often quite costly for the employers as well. It may seem like this principle would advocate that no code should ever know anything about any other code, but that s hardly the case, as a program written like that couldn t actually do anything. Some sections of code will always need to reference others; that s unavoidable. The key is to make sure that the details of one feature are hidden from the others. In Python, loose coupling is typically provided in a number of ways, some of which are shown in the following list. There are countless others, which could fill a book on their own, but the techniques shown here are described in detail in 2.

By deriving from StringDictionary, you gain the ability to use the EncryptedQueryString like an ordinary string collection As a result, you can add information to the EncryptedQueryString in the same way you add information to the RequestQueryString collection Here s an example: encryptedQueryString["value1"] = "Sample Value"; Best of all, you get this functionality for free, without needing to write any additional code So, with just this rudimentary class, you have the ability to store a collection of name/value strings But how do you actually place this information into the query string The EncryptedQueryString class provides a ToString() method that examines all the collection data and combines it in a single encrypted string First, the EncryptedQueryString class needs to combine the separate collection values into a delimited string so that it s easy to split the string back into a collection on the destination page.

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