QFilter: Fine-Grained Run-Time XML Access Control via NFA-based Query Rewriting Bo Luo, Dongwon Lee, Wang-Chien Lee, Peng Liu The Pennsylvania State University, University Park, PA 16802, USA email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org ABSTRACT At present, most of the state-of-the-art solutions for XML access controls are either (1) document-level access control techniques that are too limited to support fine-grained security enforcement; (2) view-based approaches that are often expensive to create and maintain; or (3) impractical proposals that require substantial security-related support from underlying XML databases. In this paper, we take a different approach that assumes no security support from underlying XML databases and examine three alternative fine-grained XML access control solutions, namely primitive, pre-processing and post-processing approaches. In particular, we advocate a pre-processing method called QFilter that uses Non-deterministic Finite Automata (NFA) to rewrite user's query such that any parts violating access control rules are pruned. We show the construction and execution of a QFilter and demonstrate its superiority to other competing methods. systems (e.g. Apache), is to allow specification and control of data access at the document (or file) level. However, this simple solution is not sufficient for today's XML applications, where data access needs to be performed at
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