His research interests are in many areas of computer security. He has published a monograph and over 270 refereed technical papers.

His research has been sponsored by NSF, ARO, AFOSR, DARPA, DHS, DOE, AFRL, NSA, TTC, CISCO, and HP. He has served as a program (co-)chair or general (co-)chair for over 10 international conferences (e.g., Asia CCS 2010, CNS 2018) and workshops (e.g., ACM MTD 2016). He chaired the Steering Committee of SecureComm during 2008-14. He has served on over 100 program committees and reviewed papers for numerous journals. He is an associate editor for IEEE TDSC. He is a recipient of the DOE Early Career Principle Investigator Award. He has co-led the effort to make Penn State a NSA-certified National Center of Excellence in Information Assurance Education and Research. He has advised or co-advised over 34 PhD dissertations to completion.