A technique to build a secret key in integrated circuits for identification and authentication applications

J.W. Lee, Daihyun Lim, B. Gassend, G.E. Suh, M. van Dijk, S. Devadas
<i title="Widerkehr and Associates"> 2004 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.04CH37525) </i> &nbsp;
This paper describes a technique that exploits the statistical delay variations of wires and transistors across ICs to build a secret key unique to each IC. To explore its feasibility, we fabricated a candidate circuit to generate a response based on its delay characteristics. We show that there exists enough delay variation across ICs implementing the proposed circuit to identify individual ICs. Further, the circuit functions reliably over a practical range of environmental variation such as temperature and voltage.
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