Mr. Santiago Montoya Profile

Santiago Montoya

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Proceedings Article | 19 September 2018 Paper

Experimental noise-free information recovery via reference beam encryption

John Alexis Jaramillo Osorio, John Fredy Barrera Ramírez, Santiago Montoya, Alejandro Mira-Agudelo, Alejandro Velez Zea, Roberto Torroba

Proceedings Volume 10721, 107212E (2018) https://doi.org/10.1117/12.2321349

KEYWORDS: Fourier transforms, Lanthanum, Computer security, Interferometry, Glasses, Diffusers, CMOS cameras, Spatial light modulators, Image quality, Free space optics

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Optical encryption is an open and prolific field with a continual growth. Several cryptosystems as the 4f encrypting system, joint transform correlator (JTC), joint free space cryptosystem (JFSC) and the fractional JTC (FrJTC) cryptosystem have demonstrated high-performance data protection. The experimental implementation of each architecture shows different performances, opening a wide area of research. In this work we experimentally implement an interferometric cryptosystem in which the encryption key is a ground glass diffuser (GGD) located in the reference arm. In the object arm, the information to be encoded is displayed in a spatial light modulator placed in contact with another GGD representing the input object plane. In the setup a lens brings the Fourier transform of the input object plane. In the cryptosystem, the encryption process is achieved by the interference between the Fresnel transform of the key and the Fourier transform of the input object plane. This interference pattern is registered by a CMOS camera. The free propagation distance z between the key plane and the output plane determines the correct Fresnel transform of the key in the register plane. Then, for the decryption process, both the encrypted data and the information of the Fresnel transform of the key in the correct distance are necessary. In order to test the capabilities of the cryptosystem, we implemented experimentally QR codes as an information container making possible a protocol for a noise-free information recovery. The experimental results show the viability and applicability of the proposal.

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