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Dissertation Defense - A K M Nuhil Mehdy

June 15 @ 3:00 pm - 5:00 pm MDT

Dissertation Defense info for A K M Nuhil Mehdy

Title: Modeling and Analyzing User’s Privacy Disclosure Behavior to Generate Personalized Privacy Policies

Program: Doctor of Philosophy in Computing

Advisor: Dr. Hoda Mehrpouyan, Computer Science

Committee Members: Dr. Casey Kennington, Computer Science, Dr. Jyh-haw Yeh, Computer Science, and Dr. Michael Ekstrand, Computer Science


Privacy and its importance to society have been studied for centuries. While our understanding and continued theory building to hypothesize how users make privacy disclosure decisions has increased over time, the struggle to find a one-size solution that satisfies the requirements of each individual remains unsolved. Depending on culture, gender, age, and other situational factors, the concept of privacy and users’ expectations of how their privacy should be protected varies from person to person. The goal of this dissertation is to design and develop tools and algorithms to support personal privacy management for end-users. The foundation of this research is based on ensuring the appropriate flow of information based on a user’s unique set of personalized rules, policies, and principles. This goal is achieved by building a context-aware and user-centric privacy framework that applies insights from the users’ privacy decision making process, natural language processing (NLP), and formal specification and verification techniques. We conducted a survey (N=401) based on the theory of planned behavior (TPB) to measure the way users’ perceptions of privacy factors and intent to disclose information are affected by three situational factors embodied hypothetical scenarios: information type, recipients’ role, and trust source. To help build usable privacy tools, we developed multiple NLP models based on novel architectures and ground truth dataset, that can precisely recognize privacy disclosures through text by utilizing state-of-the-art semantic and syntactic analysis, the hidden pattern of sentence structure, tone of the author, and metadata from the content. We also designed a methodology to formally model, validate, and verify personalized privacy disclosure behavior based on the analysis of the users’ situational decision-making process. A robust model checking tool (UPPAAL) is used to represent users’ self-reported privacy disclosure behavior by an extended form of finite state automata (FSA). Further, reachability analysis is performed for the verification of privacy properties through computation tree logic (CTL) formulas. Most importantly, we study the correctness, explainability, usability, and acceptance of the proposed methodologies. This dissertation, through extensive amounts of experimental results, contributes several insights to the area of user-tailored privacy modeling and personalized privacy systems.