Worcester Polytechnic Institute

Upcoming Seminar: Sandip Kundu

Thursday, February 12 at 3pm in AK 233:

Improving Uniqueness and Modeling Attack Resistance of Strong PUFs
Presenter: Sandip Kundu (UMass Amherst)


Hardware authentication is fundamentally concerned with establishing the authenticity of smart tags or system components including the provenance of ICs throughout its lifecycle. Physically Unclonable Functions (PUFs) are promising for low-cost authentication since they are based on inherent random physical disorder that cannot be cloned – even by their manufacturer. In principle, a set of challenge-response pairs unique to a PUF characterizes its behavior that makes low-cost unique identification possible. Strong PUFs are a subclass of PUFs that possess an extremely large input-output space, potentially denying an adversary the ability to mount a cloning attack. Despite its promise, Strong PUFs currently do not live up to the expectations due to low uniqueness that arise from correlation in manufacturing process variations, ability of an attacker to model the behavior of a PUF from observing a limited set of challenge-response pairs, ability of multiple agents from manufacturer, distributor to system integrator to mine the CRP data at various points in the supply chain and unreliability of PUF responses over its range of operating conditions and over its lifetime.

In this talk we will describe a solution to the low PUF uniqueness based on actual PUF testing, where non-unique parts will be identified and be subjected to ex post-facto recovery by repair, similar to memory repair techniques. The testing problem is complicated by the fact that a PUF response must be compared against all previous unique PUF responses without increasing test time or cost. We propose multi-index hashing to speed-up this process and show practicality of the solution. We address the modeling attack problem by a novel non-linear circuit design solution that simultaneously improves modeling attack resistance, reliability and uniqueness.

Sandip Kundu is a Professor at the University of Massachusetts at Amherst. Prior to joining academia, he spent 17 years in industry: first as a Research Staff Member at IBM Research Division and then at Intel Corporation as a Principal Engineer. He has published over 200 research papers in VLSI Design and Test and holds several key patents including ultra-drowsy sleep mode in processors, and has given more than a dozen tutorials at various conferences.

Applied Cryptology Seminar
The seminar features presentations of hot topics within the
interdisciplinary field of cyber-security.

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