Theoretische Grundlagen der Kommunikationstechnik

Invitation To A Talk by Prof. Suhas Diggavi, Ph.D., University of California Los Angeles (UCLA), USA

Time15 December 2017, 04:00 p.m.  
LocationRoom MAR 0.003, Marchstr. 23, 10587 Berlin  
TitleFoundations of security in cyber-physical systems  


Cyber-physical systems (CPS) such as automobiles, electrical grids,transportation networks and water networks, are increasingly controlled through (distributed) cyber-systems, which make them vulnerable to attacks. To secure CPS systems, just protecting bits (cyber-security) is insufficient: a sensor attack can feed wrong inputs to sensors and thus manipulate the physical signals before they get converted to bits.  By drawing insights from error correction, we develop CPS defense strategies that leverage the physical dynamics of CPS to protect against attacks.  We demonstrate such strategies for the state estimation problem in the presence of attacks on sensors and actuators. We characterize the resilience of the system, which corresponds to the maximum number of attacks that can be tolerated while successfully reconstructing the state from observations. When there is measurement and process noise, these ideas enable design of (optimal) MMSE estimation under adversarial attacks.  We also propose computationally feasible state estimators for these problems.  For the problem of designing output-feedback controllers that stabilize the system, we show that a principle of separation between estimation and control holds, even when there are adversarial attacks. We also develop ideas on how to develop secure active sensing, which could protect against individual sensor attacks in the context of anti-lock brake (ABS) sensors. We conclude the talk with a new notion of distortion security which is suitable for security for CPS systems, and show that it can also potentially enable lightweight security.

Parts of this talk are joint work with S. Mishra, Y. Shoukry, H. Fawzi, Y.Yona, M. Showkatbaksh, N. Karamchandani, G. Agarwal, C. Tsai, C. Fragouli, P. Tabuada, and M. Srivastava



Suhas N. Diggavi received a B. Tech. degree in electrical engineering from the Indian Institute of Technology, Delhi, India, and the Ph.D. degree in electrical engineering from Stanford University, Stanford, CA. After completing his Ph.D., he was a Principal Member Technical Staff in the Information Sciences Center, AT&T Shannon Laboratories, Florham Park, NJ. After that he was on the faculty of the School of Computer and Communication Sciences, EPFL, where he directed the Laboratory for Information and Communication Systems (LICOS). He joined UCLA as Professor of Electrical Engineering in 2010. He is a recipient of the 2006 IEEE Donald Fink prize paper award, 2005 IEEE Vehicular Technology Conference best paper award and the Okawa foundation research award. He was an associate editor for Communication Letters and was a guest editor for a special issue in the IEEE Journal on Special Topics in Signal Processing. He is currently an associate editor for the ACM/IEEE Transactions on Networking and the IEEE Transactions on Information Theory (Shannon theory).