Seyed Hossein Ahmadinejad

Identity Management Consultant

I am an Identity Management Consultant at Nulli Secundus Inc.. I work on identity management solutions including Federation, Access Management, Identity Provisioning, etc. I recently received my PhD in Computer Science from University of Calgary. The title of my PhD dissertation was A View-Based Protection Model to Prevent Inference Attacks by Third-Party Extensions to Social Computing Platforms. I used to be a member of Institute for Security, Privacy and Information Assurance (ISPIA), and iCORE Information Security Laboratory (The iCIS Lab).
My family, and relatives call me Hossein, but my colleagues know me by Seyed, just to avoid confusion.

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Work Experience

    • Identity Management Consultant
      • Jun 2015-present @ Nulli Secundus Inc., Calgary, AB Canada

        • Design identity solution architecture; Deploy identity management solutions including Federation, Access Control, Identity Provisioning, Directory Services, etc.

    • Security & Privacy Research Assistant
      • Sep 2010-Oct 2015 @ University of Calgary, Calgary, AB Canada

        • Designed and developed a Facebook third-party extension (in Javascript/AJAX/MySQL) that automate inferring users' inaccessible information, such as their partner's name, hometown, etc., from their public information; demonstrated a subtle privacy threat associated to extensions to social computing platforms (more info in my webpage).
        • Proposed a view-based information-sharing framework for extension API of social computing platforms to protect user profiles against inference attacks; awarded four consecutive Department Research Awards and a Google Research Award for this project.
        • Develop a secure wrapper (in Python and Haskell), with a content-based and fine-grained authorization mechanism, for social computing platforms API, to allow users to share a transformation of their profiles with 3rd-party extensions.

    • Python/Java/SQLite Developer
      • Aug 2014-Jan 2015 @ NovelSec Inc., Calgary, AB Canada

        • Develop a highly secure cloud solution, called SkyShare, to enable users of cloud services to securely use such services with no need of encryption keys; enhanced speed and security compared to the existing popular cloud solutions such as DropBox and GoogleDrive (Prototype ready for download at for Windows, Mac, and Linux).
        • Designed and developed an Android task manager application; gained Android development experience, from supporting different versions of Android API and devices to offering in-app purchases (available in Google Play at

    • Java/Javascript/Ajax/MySQL Developer
      • Feb 2010-Nov 2012 @ Yas Arghavni Co., Tehran, Iran

        • Designed and developed a web application for real-time monitoring of financial electronic transactions which is currently used by one of the largest banks in Iran; visualized real-time status of different types of electronic transactions.

    • C#.Net/MS SQL Developer
      • Jun 2006-Jul 2008 @ Aflak Novinkar Engineering Co., Tehran, Iran

        • Designed and developed several financial management solutions including Payroll, Accounting, Component Handling, and Chain Store Management; directly worked with end users to assess their requirements; provided long-term maintenance and support services.

    • Teaching Assistant/Instructor
      • Jan 2010-Jan 2014 @ University of Calgary, Calgary, AB Canada

        • Taught both basic and advanced concepts of computer science including, Software Engineering, Introduction to Problem Solving, and Programming Paradigms; enthusiastic in working with students on their innovative ideas as their course projects.


  • University of Calgary, Calgary, AB Canada

    Computer Science
    GPA: 4.0/4.0

    Proposed solutions in order to prevent 3rd-party extensions to Social Network Systems (SNSs) from inferring users' inaccessible information from their accessible information. This types of privacy violation is called SNS API inference attacks.

  • Tarbiat Modares University, Tehran, Iran

    Computer Engineering 2007-2010

    Proposed a new approach to correlating alerts raised by intrusion detection systems, and construct attack scenarios.

Research Interests

  • Mountain View

Honors & Awards

    • Sep 2010-Apr 2014 Department Research Award, University of Calgary, Calgary, Alberta Canada.

    • Apr 2012-Apr 2013 Best Poster Award, NSERC Internetworked Systems Security Network (ISSNet) Workshop, Kingston, Ontario Canada.

    • Sep 2011 Computer Science Alumni Chapter Graduate Scholarship, University of Calgary, Calgary, Alberta Canada.

    • Feb 2010 Research Award, Iran Telecommunication Research Center (ITRC), Tehran Iran.


    • S. H. Ahmadinejad, and P. Fong, “Unintended disclosure of information: Inference attacks by third-party extensions to Social Network Systems”, Computers & Security, vol. 44, pp. 75-91, 2014. (ISI impact factor: 1.158)

    • S. H. Ahmadinejad, and P. Fong, “On the Feasibility of inference attacks by third-party extensions to social network systems,” in Proceedings of the 8th ACM Symposium on Information, Computer and Communications Security (ASIACCS 2013), Hangzhou, China, May 2013, pp. 161-166.

    • S. H. Ahmadinejad, M. Anwar, and P. Fong, “Inference attacks by third-party extensions to social network systems,” in Proceedings of the 3rd IEEE International Workshop on Security and Social Networking (SESOC'11) (published as part of the Proceedings for the 2011 IEEE International Conference on Pervasive Computing and Communications Workshops - PERCOM Workshops), March 2011, pp. 282 –287.

    • S. H. Ahmadinejad, S. Jalili, and M. Abadi, “A hybrid model for correlating alerts of known and unknown attack scenarios and updating attack graphs,” Computer Networks, vol. 55, no. 9, pp. 2221 – 2240, 2011. (ISI impact factor: 1.201)

    • S. H. Ahmadinejad and S. Jalili, “Correlating alerts into compressed graphs using an attribute-based method and time windows,” in Security Technology, ser. Communications in Computer and Information Science. Springer Berlin Heidelberg, 2009, vol. 58, pp. 18–25

    • S. H. Ahmadinejad and S. Jalili, “Alert correlation using correlation probability estimation and time windows,” in 2009 International Conference on Computer Technology and Development. IEEE, 2009, pp. 170–175

    • M. Khaksar, S. H. Ahmadinejad, N. T. Neishaboori, A Security Model for Electronic City Based on Service-Oriented Architecture Security Standards. 2nd Conference On Electronic City, Tehran, Iran (2009) 1641-1649.

Co-curricular Activities

    • Sep 2013 Flood Relief Volunteer, Disaster & Humanitarian Relief, High River, AB Canada.

    • Sep 2012-Present Fundraising volunteer, Persian Gulf Club Charity Foundation, Calgary, AB Canada.

    • Sep 2012-Aug 2013 VP-Communication, Computer Science Graduate Society, University of Calgary, Calgary, AB Canada.

    • Sep 2011 Mentor, International Students and Study Abroad (CISSA), University of Calgary, Calgary, AB Canada.

    • Sep 2004-Sep 2005 Co-Founder, Scientific Association for Computer Engineering, Arak University, Arak Iran.

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My Address

#401 - 1228 Kensington Road NW Calgary, AB, Canada T2N 3P7

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