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Message: [QUOTE="Zhi-Qiang Ni[MSFT], post: 4285794"] Hi Chuck, Please post your code how to use aspnet_regiis to create a machine encryption key. When you use aspnet_regiis to encypt the section of web.config, you aassign DataProtectionConfigurationProvider. The DataProtectionConfigurationProvider uses the Windows Data Protection API (DPAPI) underneath the covers. This provider a machine-specific secret key for encryption and decryption work. Because the DataProtectionConfigurationProvider relies on a machine-specific key. So it store in %windir%\system32\Microsoft\Protect\S-1-5-18. I do't find a way to view it. But when you assign RSA Key Container with aspnet_regiis, you can use the following way to export the custom RSA key container to an XML file. [URL]http://msdn.microsoft.com/en-us/library/f5cs0acs.aspx[/URL] [URL]http://msdn.microsoft.com/en-us/library/2w117ede.aspx[/URL] Please refer the following link: [URL]http://msdn.microsoft.com/en-us/library/zhhddkxy.aspx[/URL] [URL]http://odetocode.com/Articles/418.aspx[/URL] [/QUOTE]