Design and implementation of an access control processor for XML documents
Proceedings of the 9th international World Wide Web conference on Computer networks : the international journal of computer and telecommunications netowrking
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Computer Standards & Interfaces
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This paper describes an alternative encryption method for XML [1] which is capable to encrypt single XML Information Set [2] items. It is able to hide the size and the existence of encrypted contents. As a result, it prevents a 'traffic analysis', i.e. it's analogous counterpart for documents. In 2001, the W3C launched the XML Encryption working group which, among other things, defined how to encrypt portions of XML documents [3]. The portion must always be a subtree or a consecutive sequence of subtrees. On the other hand, XML Access Control allows more granular restrictions on what portions on an XML document a client is allowed to see: XML Access Control can remove an ancestor node from a document while leaving a descendant node in the document. This paper describes an encryption system which allows to have these 'deep children' in plaintext while having the ancestors encrypted, i.e. bringing the property from XML Access Control to XML Encryption.