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An example would be when a SAML assertion is signed and then carried somewhere in a SOAP message.However, in the environment described above, problems can arise even when using Exclusive Canonicalization.The following capabilities are particularly useful. However, we have encountered a variety of issues relating to the use of XML Signature and XML Encryption both separately and in combination. While real problems in the field have been rare to date, it is our expectation that as applications begin to take advantage of the capabilities of these specifications and the ones that use them, problems will become more frequent.
Consider signing this with Exclusive Canonicalization, including the foo prefix in the Inclusive Namespaces Prefix List.
If an intermediary introduces the use of this namespace prefix in an ancestor, then the signature will break because xmlns:foo will be canonicalized with the To Be Signed element instead of the Data element.
We have been shipping our implementations of XML Signature and XML Encryption in our products for several years now.
This paper reflects our experiences in implementing these standards, our customers experiences in using them and our experiences defining other standards which normatively reference them.
In practice, application software which understands if and where qnames have been used in content and security software responsible for performing Canonicalization are distinct layered components.