题目：Exploiting Mobile Social Behaviors for Sybil

时间：2014年12月29日(周一)上午10:00-11:00

地点：玉泉校区老行政楼108学术会议室

报告人：Dr. Rongxing Lu Nanyang Technological University

Introduction：

In this talk, we will discuss a Social�based Mobile Sybil Detection (SMSD) scheme to detect Sybil attackers from their abnormal contacts and pseudonym changing behaviors. First, we define four levels of Sybil attackers in mobile environments according to their attacking capabilities. Then, we exploit mobile users’ contacts and their pseudonym changing behaviors to distinguish Sybil attackers from normal users. To alleviate the storage and computation burden of mobile users, the cloud server is introduced to store mobile user’s contact information and to perform the Sybil detection. Furthermore, we utilize a ring structure associated with mobile user’s contact signatures to resist the contact forgery by mobile users and cloud servers. In addition, investigating mobile user's contact distribution and social proximity, we propose a semi�supervised learning with Hidden Markov Model to detect the colluded mobile users. Security analysis demonstrates that the SMSD can resist the Sybil attackers from the defined four levels, while the extensive trace�driven simulation shows that the SMSD can detect these Sybil attackers with high accuracy.

Bio：

Rongxing Lu has been an assistant professor at the School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore, since May 2013. Before that, he worked as a Postdoctoral Fellow at the University of Waterloo from May 2012 to April 2013. Rongxing Lu was awarded the most prestigious ʺGovernor Generalʹs Gold Medalʺ, when he received his PhD degree from the Department of Electrical & Computer Engineering, University of Waterloo, Canada, in 2012; and won the 8th IEEE Communications Society (ComSoc) Asia Pacific (AP) Outstanding Young Researcher Award, in 2013. He is presently a member of IEEE Communications Society. His research interests include big data security and privacy, cloud and fog computing security, smart grid security, and applied cryptography. He has published extensively in his areas of expertise (with H�index 36 from Google Scholar currently), and was the recipient of the Best Paper Awards of IEEE WCNC 2013, IEEE ICCC 2013, BodyNets 2010, ICCCN 2009, and Chinacom 2008. He has been on the editorial boards of several international referred journals, e.g., IEEE Networks, and currently serves the technical symposium co�chair of ICNC’15, and many technical program committees of IEEE and others international conferences, including IEEE Infocom, Globecom, and ICC.