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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 26 — Sep. 10, 2000
  • pp: 4783–4787

Optical encryption system with a binary key code

Takanori Nomura and Bahram Javidi  »View Author Affiliations


Applied Optics, Vol. 39, Issue 26, pp. 4783-4787 (2000)
http://dx.doi.org/10.1364/AO.39.004783


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Abstract

A double-random-phase optical encryption system that uses a binary key code is proposed. The key code is generated as a binary computer-generated hologram. The binary key code can be displayed on a binary spatial light modulator (SLM) such as a ferroelectric liquid-crystal display. The use of a binary SLM enables us to renew the key at high speed. A joint transform correlator based on a photorefractive crystal in the Fourier domain is used to perform shift-invariant encryption and decryption. Computer simulations of the effects of using a binary encoded key code instead of a complex amplitude key code are shown. Preliminary optical experimental results are presented to demonstrate the effectiveness of the proposed system.

© 2000 Optical Society of America

OCIS Codes
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.4550) Fourier optics and signal processing : Correlators
(070.4560) Fourier optics and signal processing : Data processing by optical means
(090.1760) Holography : Computer holography
(200.3050) Optics in computing : Information processing
(200.4740) Optics in computing : Optical processing

History
Original Manuscript: August 16, 1999
Revised Manuscript: June 12, 2000
Published: September 10, 2000

Citation
Takanori Nomura and Bahram Javidi, "Optical encryption system with a binary key code," Appl. Opt. 39, 4783-4787 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-26-4783


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