Criticisms
There are criticisms directed at the architecture of XML security in general, and at the suitability of XML canonicalization in particular as a front end to signing and encrypting XML data due to its complexity, inherent processing requirement, and poor performance characteristics. The argument is that performing XML canonicalization causes excessive latency that is simply too much to overcome for transactional, performance sensitive SOA applications.
These issues are being addressed in the XML Security Working Group.
Another issue is that without proper policy the use of XML Dsig in SOAP and WS-Security can lead to vulnerabilities.
Read more about this topic: XML Signature
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