Encrypting app.config File

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You cannot encrypt the entire <system.serviceModel> – it’s a configuration section group, which contains configuration sections.

The aspnet_regiis will only encrypt configuration sections – so you need to selectively encrypt those parts you need, like this:

cd C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727
aspnet_regiis.exe -pef "system.serviceModel/bindings" .
aspnet_regiis.exe -pef "system.serviceModel/services" .

etc.

With this, you can encrypt what you need easily – what isn’t too important, can be left in clear text.

Word of warning: since it’s aspnet_regiis, it expects to be dealing with a web.config file – copy your app.config to a location and call it web.config, encrypt your sections, and copy those encrypted sections back into your own app.config.

Or write your own config section encrypter/decrypter – it’s really just a few lines of code! Or use mine – I wrote a small ConfigSectionCrypt utility, come grab it off my OneDrive – with full source (C# – .NET 3.5 – Visual Studio 2008). It allows you to encrypt and decrypt sections from any config file – just specify the file name on the command line.

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