Nektarios Leontiadis

About me

I am a Threat Research Scientist at FacebookI joined the team in 2014, right after obtaining my PhD from Carnegie Mellon University.  Since then, I has been working on providing a better understanding of the threat ecosystem targeting Facebook users. This understanding involves building and refining signals of compromise, as well as evaluating Facebook's user remediation systems. I investigate threats targeting our platform and our users, in an effort to understand the underlying mechanics and economics of the illicit activities. 

In August 2014 I received a PhD in Engineering and Public Policy (EPP) from Carnegie Mellon University. Research-wise, I worked on empirical measurements and economic modeling of online crime, towards structuring effective countermeasures. This is evident in my PhD thesis Structuring Disincentives for Online Criminals. In this effort I was fortunate to be advised by Nicolas Christin and funded by CyLab.

Recent publications

  • S.Farooqi, F. Zaffar, N. Leontiadis, Z. Shafiq. Measuring and Mitigating OAuth Access Token Abuse by Collusion Networks. In Proceedings of the 17th Internet Measurement Conference (IMC'17). London, UK. November 2017.
    [to appear]

  • L. DeKoven, S. Savage, G. Voelker, and N. LeontiadisMalicious Browser Extensions at Scale: Bridging the Observability Gap between Web Site and Browser. In Proceedings of 10th USENIX Workshop on Cyber Security Experimentation and Test (CSET'17). Vancouver, Canada. August 2017. [paper]

  • N. Leontiadis, and A. Hutchings. Scripting the crime commission process in the illicit online prescription drug tradeJournal of Cybersecurity2015.

  • N. Leontiadis, T. Moore, and N. Christin. A Nearly Four-Year Longitudinal Study of Search-Engine Poisoning. In Proceedings of the 21st ACM Conference on Computer and Communications Security (CCS'14). Scottsdale, Arizona. November 2014.

  • N. Leontiadis, and N. Christin. Empirically measuring WHOIS misuse. In Proceedings of the 19th European Symposium on Research in Computer Security (ESORICS'14). Wroclaw, Poland. September 2014.

  • N. Leontiadis. Structuring Disincentives for Online Criminals. PhD Thesis. Carnegie Mellon University. August 2014.
    Nominated for the ACM Doctoral Dissertation award. 
    [thesis (main link)thesis (alt link)]

  • N. Leontiadis, and N. Christin. WHOIS Misuse Study. ICANN, March 2014.

  • N. Leontiadis, T. Moore, and N. Christin. Pick Your Poison: Pricing and Inventories at Unlicensed Online Pharmacies. In Proceedings of the 14th ACM Conference on Electronic Commerce (EC'13), pages 621-638. Philadelphia, PA. June 2013.

  • T. Moore, N. Leontiadis, and N. Christin. Fashion Crimes: Trending-Term Exploitation on the Web. In Proceedings of the 18th ACM Conference on Computer and Communications Security (CCS'11), pages 455-466. Chicago, IL. October 2011.

  • N. Leontiadis, T. Moore, and N. Christin. Measuring and Analyzing Search-Redirection Attacks in the Illicit Online Prescription Drug Trade. In Proceedings of the 20th USENIX Security Symposium (USENIX'11), pages 281-298. San Francisco, CA. August 2011.

Academic service

  • Facebook Fellowship and Emerging Scholar Award Committee member (2015-2018)
  • Facebook Secure the Internet Grant Committee member (2018).
  • 13th IEEE Symposium on Electronic Crime Research (eCrime 2018). PC Member
  • ACM Transactions on Privacy and Security. Reviewer (2018)
  • 2018 Network and Distributed System Security Symposium (NDSS). PC Member
  • 26th USENIX Security Symposium 2017. Posters PC Member
  • 12th Symposium on Electronic Crime Research (eCrime) 2017. PC member.
  • Journal of Qualitative Criminal Justice and Criminology. Reviewer.
  • 25th USENIX Security Symposium 2016. PC member.
  • 46th Annual IEEE/IFIP International Conference on Dependable Systems and Networks (DNS) 2016. PC member.
  • 15th Workshop on the Economics of Information Security (WEIS) 2016. PC member.
  • ACM Transactions on Information and System Security (TISSEC). Reviewer.
  • 7th Workshop on Simplifying Complex Networks for Practitioners (SIMPLEX) 2014. PC member.
  • 23rd USENIX Security Symposium 2014. External reviewer.
  • 27th Computer Security Foundations Symposium (CSF) 2014. External reviewer.
  • 6th Workshop on Simplifying Complex Networks for Practitioners (SIMPLEX) 2014. PC member.
  • 35th IEEE Symposium on Security and Privacy (Oakland) 2014. External reviewer.
  • 12th Workshop on the Economics of Information Security (WEIS) 2013. External reviewer.

My PGP key details:

2048R/A8D6F5EC 2011-10-06
Fingerprint = 85E1 A087 B5C9 901B 7045 433B 381B EC5E A8D6 F5EC 
The key

my photo should appear here