Georgios Portokalidis

I am an Associate Professor in the Department of Computer Science at Stevens Institute of Technology. I obtained my PhD in Computer Science from Vrije Universiteit Amsterdam on February 2010 and then moved to work as a postdoctoral researcher at Columbia University. I also hold an MSc and BSc in Computer Science from Leiden University and University of Crete, respectively.

My research interests are mainly around the area of software systems and security. Specifically, in the past I have worked on low-level software security, honeypots, taint analysis (information-flow tracking), analysis of binary software, run-time and compile-time software instrumentation, control-flow integrity, code-reuse attacks, Tor, and user authentication. For more information check out my CV and my Google Scholar Profile.

If you are a strong programmer and always curious to learn how things work under the hood, I'm always looking for students to join my group. Prospective PhD students can email me and submit an application to Stevens. Stevens is at an amazing location and it is a great place to do impactful research: ranked #37 in Computer Security in the USA . Opportunities for MS and undergraduate students are also available. More info under openings.


Email: georgios + domain name
Twitter: @portokalidis
Phone extension: 8311

Gateway South Building, Room 329
Department of Computer Science, Stevens Institute of Technology
1 Castle Point Terrace, Hoboken, NJ 07030


March '21 Our paper "Towards Optimal Use of Exception Handling Information for Function Detection" is to appear in DSN 2021.

Feb '21 The web page for CS-492 Operating Systems is now up.

Dec '20 Our paper "Large-Scale Debloating of Binary Shared Libraries" appears in Digital Threats: Research and Practice (DTRAP)

Aug '20 The web page for CS-576 Systems Security is now up.

Aug '20 Our paper "SoK: All You Ever Wanted to Know About x86/x64 Binary Disassembly But Were Afraid to Ask" was accepted for publication in the proceedings of the IEEE Symposium on Security and Privacy 2021.

Aug '20 Our paper "Speculative Probing: Hacking Blind in the Spectre Era" was accepted for publication in the proceedings of the ACM Conference on Computer and Communications Security 2020.

Research Highlights

Selected Publications

SoK: All You Ever Wanted to Know About x86/x64 Binary Disassembly But Were Afraid to Ask
Chengbin Pang, Ruotong Yu, Yaohui Chen, Eric Koskinen, Georgios Portokalidis, Bing Mao, and Jun Xu
To appear in Proceedings of the IEEE Symposium on Security and Privacy, San Francisco, CA, May 2021

Nibbler: Debloating Binary Shared Libraries
Ioannis Agadakos, Di Jin, David Williams-King, Vasileios P. Kemerlis, and Georgios Portokalidis
Proceedings of the Annual Computer Security Applications Conference (ACSAC), San Juan, Puerto Rico, December 2019 (22.6%)

Position-independent Code Reuse: On the Effectiveness of ASLR in the Absence of Information Disclosure
Enes Göktaş, Benjamin Kollenda, Philipp Koppe, Eric Bosman, Georgios Portokalidis, Thorsten Holz, Herbert Bos, and Cristiano Giuffrida
Proceedings of the IEEE European Symposium on Security and Privacy, London, United Kingdom, April 2018 (22.9%)

Techu: Open and Privacy-preserving Crowdsourced GPS for the Masses
Ioannis Agadakos, Jason Polakis, and Georgios Portokalidis
Proceedings of the ACM International Conference on Mobile Systems, Applications, and Services (MobiSys), Niagara Falls, NY, USA, June 2017 (18%)

Location-enhanced Authentication using the IoT
Ioannis Agadakos, Per Hallgren, Dimitrios Damopoulos, Andrei Sabelfeld, and Georgios Portokalidis
Proceedings of the Annual Computer Security Applications Conference (ACSAC), Los Angeles, CA, USA, December 2016 (22.8%)

NaClDroid: Native Code Isolation for Android Applications
Elias Athanasopoulos, Vasileios P. Kemerlis, Georgios Portokalidis, and Angelos Keromytis
Proceedings of the European Symposium on Research in Computer Security (ESORICS), Heraklion, Crete, Greece, September 2016 (21%)

Selected Grands and Awards

PI (lead), "ABIDES: Adaptive BInary Debloating and Security", ONR, $3,243,244 (Stevens ~$1M), September 2017 - August 2020

PI, "Adapting Static and Dynamic Program Analysis to Effectively Harden Debloated Software" ONR, $467,543, March 2016 - May 2020

PI, "Trails: Efficient Data-Flow Tracking Through HW-assisted Parallelization", DARPA, $462,419, September 2016 - August 2019

Best student paper award at the 2015 Annual Computer Security Applications Conference (ACSAC)

PhD Students


Vidya Lakshmi Rajagopalan (January 2019 - present)

Konstantinos Kleftogiorgos (September 2018 - present)


Ioannis Agadakos (January 2015 - December 2018)



Enes Goktas (May 2019 - present)


Dimitrios Damopoulos (2013 - 2015)