Multi-level Policy-aware Privacy Analysis

Maksym Yerokhin
The NAPLES (Novel Tools for Analysing Privacy Leakages) project is a research initiative conducted as a collaboration between Cybernetica AS and the University of Tartu, with funds of the Brandeis program of the Defense Advanced Research Projects Agency (DARPA). The research project has produced the theory and a set of tools for the analysis of privacy-related concerns, to determine the potential leakage of the data from the information systems. Specifically, PLEAK is a tool that takes as input business processes specified with the Business Process Model and Notation (BPMN), where model
entities are associated with privacy-enhancing technologies, in order to enable the analysis of privacy concerns at different levels of granularity. With the time, the NAPLES project has produced several analyzers. Such analyzers target SQL
collaborative workflows, that is, BPMN collaborative models that specify the steps of computation that correspond to SQL manipulation statements over the data objects representing the SQL data sources. The simple disclosure analysis performs a high-level data reachability analysis that reveals potential
data leakages in the privacy-enhanced model of a business process: it tells whether a data object is visible to a given party. Other analyzers, such as the Leaks-When and the Guessing Advantage ones, provide finer-grained, qualitative and quantitative measures of data leakage to stakeholders.
My work was part of the NAPLES project and my contributions are manifold. First, I added the concept of Global and Local privacy policies in the SQL collaborative workflows, which endow a party of the business process with access rights to the selected SQL entities with defined constraints. Second,
I designed an integrated multi-level approach to the disclosure analysis: from the high-level declarative disclosure (What data might leak?) to the conditional disclosure (When does data leak?) and quantitative measure (How much does data leak?). This approach is based on existing tools of PLEAK for privacy
analysis. However, I refined these tools to accept more unified set of inputs and integrated the privacy policies with the Leaks-When and Guessing Advantage analyzers. Finally, I developed a case study, which has been used for showcasing the aforementioned integrated multi-level approach to the disclosure analysis, and that has been used as a proof-of-concept for NAPLES tools.
Graduation Thesis language
Graduation Thesis type
Master - Software Engineering
Pille Pullonen, Luciano García-Bañuelos
Defence year