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Published April 9, 2014 | Supplemental Material + Submitted
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Reconfigurable random bit storage using polymer-dispersed liquid crystal


We present an optical method of storing random cryptographic keys, at high densities, within an electronically reconfigurable volume of polymer-dispersed liquid crystal (PDLC) film. We demonstrate how temporary application of a voltage above PDLC's saturation threshold can completely randomize (i.e., decorrelate) its optical scattering potential in less than a second. A unique optical setup is built around this resettable PDLC film to non-electronically save many random cryptographic bits, with minimal error, over a period of one day. These random bits, stored at an unprecedented density (10 Gb/mm^3), can then be erased and transformed into a new random key space in less than one second. Cryptographic applications of such a volumetric memory device include use as a crypto-currency wallet and as a source of resettable "fingerprints" for time-sensitive authentication.

Additional Information

Authors (RH & SA) contributed equally to this work.

Attached Files

Submitted - 1403.2419v1.pdf

Supplemental Material - Supplementary_text.pdf


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