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Hybrid Boolean Networks as Physically Unclonable Functions

Physically Unclonable Function (PUF) based on an ultra-fast chaotic network known as a Hybrid Boolean Network (HBN) implemented on a FPGA.

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Abstract:
“We introduce a Physically Unclonable Function (PUF) based on an ultra-fast chaotic network known as a Hybrid Boolean Network (HBN) implemented on a field programmable gate array. The network, consisting of N coupled asynchronous logic gates displaying dynamics on the sub-nanosecond time scale, acts as a `digital fingerprint’ by amplifying small manufacturing variations during a period of transient chaos. In contrast to other PUF designs, we use both N-bits per challenge and obtain N-bits per response by considering challenges to be initial states of the N-node network and responses to be states captured during the subsequent chaotic transient. We find that the presence of chaos amplifies the frozen-in randomness due to manufacturing differences and that the extractable entropy is approximately 50% of the maximum of N2 N bits. We obtain PUF uniqueness and reliability metrics μ inter = 0.40±0.01 and μ intra = 0.05±0.00, respectively, for an N=256 network. These metrics correspond to an expected Hamming distance of 102.4 bits per response. Moreover, a simple cherry-picking scheme that discards noisy bits yields μ intra <; 0.01 while still retaining ~ 200 bits/response (corresponding to a Hamming distance of ~ 80 bits/response). In addition to characterizing the uniqueness and reliability, we demonstrate super-exponential scaling in the entropy up to N=512 and demonstrate that PUFmeter, a recent PUF analysis tool, is unable to model our PUF. Finally, we characterize the temperature variation of the HBN-PUF and propose future improvements." Find the open access technical paper here. Published 03/2021.

N. Charlot, D. Canaday, A. Pomerance and D. J. Gauthier, “Hybrid Boolean Networks as Physically Unclonable Functions,” in IEEE Access, vol. 9, pp. 44855-44867, 2021, doi: 10.1109/ACCESS.2021.3066948.



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