Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 61, Issue SE, Pages -Publisher
IOP Publishing Ltd
DOI: 10.35848/1347-4065/ac506b
Keywords
Physically Unclonable Function; Printed Electronics; percolation conduction
Categories
Funding
- New Energy and Industrial Technology Development Organization (NEDO) [JPNP16007]
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The researchers proposed a simple circuit structure for a printable physically unclonable function (PUF) to enhance the security level of electronic devices. By adjusting the manufacturing conditions, the average conduction probability of the PUF elements could be controlled. However, the printing variations made the actual appearance pattern of the conduction elements completely random. Statistical evaluation showed that the randomly generated conduction pattern had enough potential to be used as a PUF security system.
We suggested a printable physically unclonable function (PUF) with a simple circuit structure, to provide a low-cost PUF for improvement in the security level of electronic devices. An element of our contact-type printable PUF was constructed of a conductive filler layer and a pair of electrodes formed by printing. The contact-type printable PUF was based on an open- or short-circuit information of elements induced by a percolation conduction phenomenon of the conductive filler layer. An average conduction probability of the elements could be controlled by adjusting the manufacturing conditions, but an actual appearance pattern of the conduction elements became completely random by the influence of the uncontrollable printing variations. We fabricated a thousand elements for each printing condition to evaluate the PUF performance statistically and obtained a random conduction pattern with a conduction probability of 48.3%. Therefore, our contact-type printable PUF had enough potential to be used as a PUF security system.
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