Unconventional Physical Unclonable Functions for IoT Security
ECE Conference room 2515 (via Lifts 25-26)


Physical Unclonable Function (PUF) has emerged as an inexpensive security primitive to overcome the device identification and authentication problems by its radically different way of interrogating hardware without the permanent presence of a secret key. The security of PUF rests in the intrinsic complexity and irreproducibility of a random physical disorder system instead of a hard-to-solve mathematical problem. Device signature generated by PUF cannot be physically replicated even by the original manufacturer due to the uncontrollable nature of manufacturing process variations. As the secret information can only be generated when the PUF is powered on, active manipulation of circuit structure will cause dysfunction of its challenge-response mechanism and become tamper evident. As unique and unclonable chip identifiers, PUFs find its niche in active hardware metering, which enables chip designers to lock and unlock the circuit functionality to gain post-fabrication control of their intellectual property and clone detection. Besides, rich variety of post-CMOS technologies, such as Phase Change Memory and Spin Transfer Torque Magnetic Random Access Memory, offer new challenges and opportunities to PUF system design. Last but not least, sensors and artificial intelligence are integral parts of an IoT ecosystem for life-changing applications. Integration of PUF credentials into sensor or machine learning circuits without compromising their original operations holds strong promises in addressing forensic and security problems in IoT. 



Chip Hong Chang received the B.Eng. (Hons.) degree from the National University of Singapore, in 1989, and the M. Eng. and Ph.D. degrees from Nanyang Technological University (NTU), Singapore, in 1993 and 1998, respectively. He served as a Technical Consultant in industry prior to joining the School of Electrical and Electronic Engineering (EEE), NTU, in 1999, where he is currently an Associate Professor. He holds joint appointments with the university as Assistant Chair of Alumni of the School of EEE from June 2008 to May 2014, Deputy Director of the 100-strong Center for High Performance Embedded Systems from 2000 to 2011, and Program Director of the Center for Integrated Circuits and Systems from 2003 to 2009. He has coedited four books, published ten book chapters, around 100 international journal papers (two-thirds are IEEE) and more than 170 refereed international conference papers. His research interests include hardware security, residue and unconventional number systems, low-power arithmetic circuits, digital filter design and digital image processing. He has delivered several keynotes and more than 40 invited colloquia, including tutorials at the 2017 Asia and South Pacific Design Automation Conference (ASP-DAC 2017) and 2017 IEEE International Symposium on Circuits and Systems (ISCAS 2017). He is the recipient of the 2006 NTU Research Outstanding and Award Recognition Scheme, 2007 British High Commission Collaboration Development Award for Microelectronics and Embedded Systems and Canada Microsystems Strategic Alliance of Quebec Collaboration Development Award, co-recipient of the PrimeAsia-2010 Gold Leaf and Silver Leaf Certificates, and coauthor of the finalist of AsianHOST 2017 Cisco best paper award, ISCAS 2015 best student paper award competition and VLSI 95 best paper award.


Dr. Chang has served as Associate Editor for the IEEE Transactions on Circuits and Systems-I from 2010–2012, IEEE Transactions on Very Large Scale Integration (VLSI) Systems since January 2011, IEEE Access since March 2013, IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems since January 2016, IEEE Transactions on Information Forensic and Security since January 2016, Springer Journal of Hardware and System Security since June 2016, Microelectronics Journal since May 2014, Integration, the VLSI Journal from 2013–2015, Editorial Advisory Board Member of the Open Electrical and Electronic Engineering Journal from 2007–2013, and the Editorial Board Member of the Journal of Electrical and Computer Engineering from 2008–2014. He also guest edited several journal special issues including IEEE Transactions on Circuits and Systems-I and IEEE Transactions on Dependable and Secure Computing, and served in the organizing and technical program committees of more than 50 international conferences (mostly IEEE). He is a Fellow of the IEEE and the IET.

ECE Conference room 2515 (via Lifts 25-26)