An infrastructure for managing secure update operations on XML data.

Secure exchange of data over the web is becoming more and more important today. By secure data exchange we mean that privacy and integrity are ensured when documents flow among different parties. A key issue in this scenario is how to ensure that web documents, when moving among different parties, are modified only according to the stated access control policies. To cope with such an issue, in this paper we propose a distributed infrastructure that enable subjects to verify, upon receiving a document, whether the update operations performed on the document till that point are correct with respect to the stated access control policies, without interacting, in most cases, with the document server.