Liquid surface oscillations for a time-dependent random-phase security system

David R. Schipf; Wei-Chih Wang

doi:10.1117/12.2291299

29 January 2018 Liquid surface oscillations for a time-dependent random-phase security system

David R. Schipf, Wei-Chih Wang

Proceedings Volume 10559, Broadband Access Communication Technologies XII; 1055908 (2018) https://doi.org/10.1117/12.2291299
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

A novel optical encryption technique that uses oscillations on a liquid lens surface and random phase masks to encode images is presented. Excited liquid surface patterns can encode optical wave fronts, making the optical transfer function of the system a function of time. This allows for possible protection against known and chosen plaintext attacks and potentially enables more flexible realizations of random phase mask security systems. However, the periodic nature of liquid surface oscillations and the geometry of the patterns can potentially place constraints on the efficacy of such a system. Simulation results show that the entropy of encrypted images depends on the liquid surface mode shape and the recording duration of the encrypted image. Additionally, it is shown that mistiming the liquid system during decryption gives significant error in the recovered images. The simulations presented here use a model of a commercial available liquid lens, giving the possibility for future comparison with experimental results.

Citation Download Citation

David R. Schipf and Wei-Chih Wang "Liquid surface oscillations for a time-dependent random-phase security system", Proc. SPIE 10559, Broadband Access Communication Technologies XII, 1055908 (29 January 2018); https://doi.org/10.1117/12.2291299

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KEYWORDS

Liquids

Image encryption

Liquid lenses

Computer security

Fourier transforms

Computer simulations

Optical transfer functions

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