I am a PhD student at Q2S NTNU since Jan 2009, supervised by Professor Svein J. Knapskog.

• Security economics, Cybercrime Analytics
• Web Security, Mobile computing, Distributed systems, Certification
• Usable Security, Crowdsourcing
• Game theory, Behavioral Economics

• Asymmetric Conflict in Information Security: Phishing as Guerrilla Warfare (in submission)
• Is this App Safe? A Large Scale Study on Application Permissions and Risk Signals (web) (to appear in WWW 2012)
• Community-based Web Security: Complementary Roles of the Serious and Casual Contributors (to appear in CSCW 2012) (paper)
• Colonel Blotto in the Phishing War (ppt, paper, DOI), GameSec (Nov 2011)
• Analyzing the Gold Star Scheme in a Split Tor Network (paper), SecureComm (Sep 2011)
• Analyzing the Incentives in Community-based Security Systems (ppt, paper, DOI), SESOC (in conjunction with IEEE PerCom) (Mar 2011)
• Re-Evaluating the Wisdom of Crowds in Assessing Web Security (ppt, paper, DOI), Financial Crypto (Feb 2011)
• Use of Ratings from Personalized Communities for Trustworthy App. Installation (ppt, paper, web), NordSec (Oct 2010)
• Exploring the Use of Explicit Trust Links for Filtering Recommenders: A Study on Epinions.com (DOI), Journal of Information Processing (July 2011)
• Does Trust Matter for User Preferences? A study on Epinions ratings (ppt, DOI), IFIPTM (Jun 2010)

• Economics of Info Security (ppt), Lecture @ Digitale telenett - Teleforum pÃ¥ Kursdagene by Tekna (Trondheim) (Jan 2012)
• On the Wisdom of Crowds for Security, Talk @ Nokia Research Centre (Palo Alto) (Jun 2011)
• A note on Security Economics (ppt), Talk @ Nokia Research Centre (Helsinki) (Aug 2009)

• On the Socio-Economic Issues of Web and Application Certification (abstract) (Dec 2010)
• Splitting the Tor Network: Potential Challenges Considering the Gold Star Approach (poster, 1st prize), NordSec (Oct 2010)
• Certification Intermediaries and the Alternative (poster), Financial Crypto (Jan 2010)
• Collaborative Software Scrutiny (ppt), Rump session @ WEIS (Jun 2009)
• Why Johnny does not Encrypt (poster), IWSCN (May 2009)

• Visiting Student Researcher to iSchool @ University of California, Berkeley (Jan–Jul 2011) (worked with Professor John Chuang)
• Research visit to Nokia Research Centre, Helsinki (Aug 2009) (worked with Andreas Heiner and N. Asokan)

• MSc (Technology), Security & Mobile Computing (Distinction), Helsinki University of Technology (TKK), Finland
• MSc (Information Technology), Royal Institute of Technology (KTH), Sweden
• BSc (Computer Engineering, Honors), National University of Singapore (NUS), Singapore

• National Computer Systems (Singapore) (consultant)
• Nokia Research Centre (Helsinki) (trainee: Summer 2007, Spring+Summer 2008)

• Rendezvous - a framework for personalized application ratings
• Friends-App-Rating (FAR) - a Facebook app plus a FireFox extension for rating Facebook applications (adapted from initial implementation by Jo Mehmet Øztarman as part of his MSc study)

• chia (at) q2s (dot) ntnu (dot) no
• +47 7359 2618 (o) / +47 4033 1962 (m)