Laurence Bull, Peter Stanski and David McG. Squire,
Content Extraction Signatures using XML Digital
Signatures and Custom Transforms On-Demand.
Tech. Rep. 2002/129, School of Computer Science and Software Engineering,
Monash University, 900 Dandenong Road, Caulfield, Victoria 3145, Australia, 2002.
In this paper we describe our work in developing custom transform algorithms to expand the functionality of an XML Signature to include Content Extraction Signature functionality. This functionality includes extraction policy verification into the XML Signature Core Validation. Also included is a custom revocation mechanism. We also describe our implementation for non-XML content where the custom transforms are dynamically loaded demonstrating that custom signing and verification is not constrained to a `closed system'. Through the use of dynamic loading we show that a verifier can still verify a custom XML Signature compliant signature even though a custom signature was produced.