My research interests are primarily about security and privacy, two of the most common questions in any computer system. In particular, I focus on developing access control solution for online social networking/computing systems that helps users enjoy sharing while keeping their data away from inappropriate access.

My PhD dissertation is about access control in online social networks (OSNs), entitled "Access Control for Online Social Networks Using Relationship Type Patterns". The objective of this research is to demonstrate that greater generality and flexibility in policy specification and effective access evaluation can be achieved in OSNs using relationship type patterns.
I am currently working on the following research projects:

1. GE CSU Innovation Challenge
  • Principal Investigator: Yuan Cheng
  • Sponsor: GE Digital, 2017
  • Description: "A challenge designed to spark the interest in the engineering and computer science talent across CSU's to develop projects, products, applications, and solutions utilizing GE's Predix technology for the Industrial Internet."
I was involved in the following research projects:

1. Enhancing Situational Awareness for Emergency Response Using Social Media Provenance
  • Principal Investigator: Ram Krishnan
  • Co-Principal Investigator: Jaehong Park
  • Sponsor: LMI, 2014 - 2015
  • Description: "The major goal of this project is to establish location proximity and relationship proximity between information, users, and events in order to enhance the veracity of information available from social media."

2. Privacy-Enhanced Secure Data Provenance
  • Principal Investigator: Ravi Sandhu
  • Sponsor: National Science Foundation, 2011 - 2016
  • Description: "The scientific objective is to create a framework of theoretical foundations, models, mechanisms and architectures that allow applications to benefit from privacy-enhanced and security use of provenance in a modular fashion."

3. SNGuard: Securing Dynamic Online Social Networks
  • Principal Investigator: Ravi Sandhu
  • Sponsor: National Science Foundation, 2008 - 2012
  • Description: "Our goal is to develop a comprehensive and compelling framework SNGuard (Social Network Guard) that satisfies diverse privacy properties, access control issues, identity management requirements, and usage patterns."