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Verifying an XML Signature
Verify the signature of the element
Recalculate the digest of the element (using the digest algorithm specified in the element)
Use the public verification key to verify that the value of the element is correct for the digest of the element

If this step passes
Recalculate the digests of the references contained within the element and compare them to the digest values expressed in each element's corresponding element.
PPT Version