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    <p>I do not have much experience with obfuscation, however what I do know is there are two methods. </p> <ol> <li>Simply renaming of variables and functions to make it difficult to read the logic when decompiled using Reflector; and </li> <li>The other where program flow is be rearranged. </li> </ol> <p>With name obfuscation the IL code and runtime performance is the same. There is apparently a difference in performance with the second method, however the only benchmarks/articles I can find are for Java. </p> <p>You are deploying to a secure device and file system <s>so there is no need to obfuscate a WP7 application</s>. As Chris pointed out, you can actually get the application package file by intercepting the HTTP request from the marketplace and extracting the GUID as detailed in a <a href="http://www.voidsoft.ro/blog/post/How-to-downloads-app-from-the-WP7-marketplace.aspx" rel="nofollow">blog post by Marius Gheorghe</a>. As Marius explains this is because the XML stream is not encrypted and that the assembly package can be retrieved using a simple request. I would expect Microsoft to patch/fix this soon (and I will mention it to our Microsoft account manager). </p> <p>As for WP7 obfuscation there is a <a href="http://nicksnettravels.builttoroam.com/post/2010/11/16/Code-Obfuscation-and-Windows-Phone-7-Application-Protection.aspx" rel="nofollow">detailed blog post here</a> that should help. </p> <p>...</p> <p>If you want to secure your application, I would spent the time encrypting your persisted data (i.e. save files) so that your users data is secure. That is what did for the WP7 <a href="http://wmpoweruser.com/full-house-poker-this-weeks-xbox-live-title-released/" rel="nofollow">Full House Poker</a> game.</p>
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    1. COYou *do* need to obfuscate. Fire up Fiddler and browse the marketplace with Zune, pull the download URL out of the XML and use it download your xap. Unzip, load dlls in favourite tool and all the code is there. Don't even need to purchase the app.
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      1. USChris Sainty
    2. COReally? I have not published an application/game for 12 months so it has changed since then. Thanks for the information Chris.
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    3. COUpdated my answer with new information. Thanks once again for pointing this out Chris.
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