I’ve been referring a lot of people lately to the steps to sign a XAP. So I decided to post an excerpt I wrote about signing Silverlight XAP files in the Silverlight 4 Whitepaper on Channel 9 here to help spread the word. The signing process is important if you are creating an elevated trust out of browser application because it helps:
* Reassure your users that the application is authentic
* Allow updates to elevated trust applications
Elevated trust out-of-browser applications enable developers to take advantage of platform features that are inaccessible to sandboxed Silverlight applications. You can digitally sign your XAP files to reassure end users of the authenticity of an application’s publisher and that the code’s integrity is intact. This feature only applies to trusted apps; sandboxed XAPs may be signed but doing so will have no effect on it.
Read more: JohnPapa.net
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