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Introduction to XML Signatures

As mentioned, an XML Signature can be used to sign any arbitrary data, whether it is XML or binary. The data is identified via URIs in one or more Reference elements. XML Signatures are described in one or more of three forms: detached, enveloping, or enveloped. A detached signature is over data that is external, or outside of the signature element itself. Enveloping signatures are signatures over data that is inside the signature element, and an enveloped signature is a signature that is contained inside the data that it is signing.

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