Bitmap based cryptographic access control for restricted views of XML documents

With the proliferation of more and more mobile devices for data access, there seems to be a great deal of demand in filtering the web content according to the user´s choice or according to the capabilities of the client terminal. For this purpose, the so called restricted views of XML documents, created dynamically are very helpful. In the present paper, we combine the bitmap based access control approach with cryptography, to generate the ePath level access control using a two dimensional access control matrix itself instead of using three dimensional security cubes. In our approach redundant storage space needed at the server for saving the various (statically generated) restricted views of the XML documents are avoided. As cryptography is also utilized in our access control mechanism, it is likely to be secure than the bitmap based access control models.