Secure Communications using Nonlinear Silicon Photonic Keys
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by
Brian C. Grubel, Bryan T. Bosworth, Michael R. Kossey, A. Brinton
Cooper, Mark A. Foster, Amy C. Foster
2017
Abstract
We present a secure communication system constructed using pairs of nonlinear
photonic physical unclonable functions (PUFs) that harness physical chaos in
integrated silicon micro-cavities. Compared to a large, electronically stored
one-time pad, our method provisions large amounts of information within the
intrinsically complex nanostructure of the micro-cavities. By probing a
micro-cavity with a rapid sequence of spectrally-encoded ultrafast optical
pulses and measuring the lightwave responses, we experimentally demonstrate the
ability to extract 2.4 Gb of key material from a single micro-cavity device.
Subsequently, in a secure communications experiment with pairs of devices, we
achieve bit error rates below 10^-5 at code rates of up to 0.1. The PUFs'
responses are never transmitted over the channel or stored in digital memory,
thus enhancing security of the system. Additionally, the micro-cavity PUFs are
extremely small, inexpensive, robust, and fully compatible with
telecommunications infrastructure, components, and electronic fabrication. This
approach can serve one-time pad or public key exchange applications where high
security is required
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