• Home
  • Search
  • Security issues in heterogeneous data federations
  • https://doi.org/10.7939/r3s14vCopy DOI Icon

Security issues in heterogeneous data federations

Show More
  • Abstract
  • Literature Map
  • References
  • Similar Papers
Abstract

Data federations allow the contents of multiple source databases to be accessed in a consistent manner. Since each source database is typically administered independently, heterogeneity often results, both in terms of how data is represented (i.e., the database schema), and in how controlled access to data is regulated. Typically, each data source exports data in relational format where it is combined into a semi-structured representation (e.g., XML). In this thesis, we address two aspects of securing heterogeneous data federations. The first deals with the accurate translation of access control policies specified over source databases into a single, unified access control policy applicable to the wider data federation. Such a translation involves mapping each local identity to one or federated identities, and ensuring that the semantics of each original source policy are preserved (i.e., that no federated identity receives access to a larger region of federated data than intended by any source policy). We outline an efficient algorithm for automating policy translation. We also underscore the importance of automated translation methods by showing that in many realistic scenarios, verifying that a federated policy satisfies all source policies is intractable. Finally, we contribute an algorithm for minimizing the size of a translated policy. The second problem we address is the prevention of information disclosures at the federated level. A disclosure risk is present when a user is able to combine the result of one or more allowable queries (i.e., queries which are permitted under the federated access control policy) with prior background knowledge in order to obtain a sufficiently high certainty of the answer to a disallowed query. We classify potential disclosure risks based on whether they can be detected at database design-time, or only when the contents of the database are known. We also describe a new measure for evaluating the magnitude of instance-based disclosure risks at query-time. Finally, we discuss the implementation of a prototype system, and conduct experiments that demonstrate the effectiveness and scalability of the proposed solution.

Similar Papers
  • Research Article
  • Citations1

Tilting at Windmills: Reflections on the Establishment of the Journal of Western Archives

  • Jun 11, 2010
  • Journal of western archives
  • Daines +1
  • Research Article
  • Citations2

Democracy and Nation Formation: National Identity Change and Dual Identity in Taiwan, 1991-2011

  • Jan 01, 2013
  • Columbia Academic Commons (Columbia University)
  • Shiau-Chi Shen
  • Research Article
  • Citations3

The Impact of Identity Aspects on EFL Learners' Achievement in Iranian Academic Context

  • Dec 01, 2015
  • SHILAP Revista de lepidopterología
  • Nasser Rashidi +1
  • Supplementary Content
  • Citations1

Dying for Attention: The Role of the Biafran Identity in the Biafran Campaign for Support during the Nigerian Civil War of 1967-70

  • Jan 01, 2011
  • uO Research (University of Ottawa)
  • Joshua P Willms
  • Research Article

Fostering Ethical Professional Identity in Tax: Using the Traditional Tax Classroom

  • Feb 25, 2019
  • Columbia Journal of Tax Law
  • Heather M Field
  • Supplementary Content

This someone: on uniqueness and self-writing

  • Feb 23, 2017
  • Figshare
  • Samuel Meenahan
  • Research Article
  • Citations6

Logging into Diaspora – Media and Online Identity Narratives among Romanians in Ireland

  • Jun 14, 2011
  • Observatorio (OBS*)
  • Gloria Macri
  • Research Article
  • Citations1

Innate and/or expressed identities: Their conceptualization through monumentality, funerary practices and grave goods? Some examples from the megalithic tradition of western France.

  • Oct 15, 2010
  • Journal of Neolithic Archaeology
  • Luc Laporte
  • Research Article
  • Citations9

Communalism and Identity among South Asians in Diaspora

  • Apr 20, 2012
  • heiDOK (Heidelberg University)
  • Crispin Bates
  • Research Article

Exploring Authorial Identity in terms of Voice Intensity and Subject-Positioning in the Argumentative Writings of Male and Female Iranian Advanced EFL Learners

  • Nov 01, 2019
  • SHILAP Revista de lepidopterología
  • Omid Mallahi
  • Research Article

French Colonialism in Algeria and Tunisia: Issues of Consolidation and Legitimacy and Their Implications

  • Jan 01, 2015
  • Revue YOUR Review (York Online Undergraduate Research)
  • Nabila Islam
  • Research Article
  • Citations1

A Putative Model of Transformative Teaching Self

  • Jul 01, 2017
  • SHILAP Revista de lepidopterología
  • Seyyed Mohammad Ali Soozandehfar +1
  • Supplementary Content

Digital identities: Presentation of self through social media

  • May 10, 2018
  • Nastaran Khoshsabk
  • Research Article
  • Citations1

Positioning and repositioning: Linguistic practices and identity negotiation of overseas returning bilinguals in Hong Kong

  • Jan 01, 2008
  • The HKU Scholars Hub (University of Hong Kong)
  • Khy Chen
  • Research Article
  • Citations5

Identities overseas? The long barrows in Denmark and Britain

  • Feb 25, 2010
  • Journal of Neolithic Archaeology
  • Constanze Rassmann
Cactus Communications logo

Copyright 2026 Cactus Communications. All rights reserved.