High-performance encryption method and all-optical authentic memory with photorefractive crystal

Akifumi Mita; Atsushi Okamoto; Noriyasu Tsuji; Masatoshi Bunsen

doi:10.1117/12.483363

17 September 2002 High performance encryption method and all-optical authentic memory with photorefractive crystal

Akifumi Mita, Atsushi Okamoto, Noriyasu Tsuji, Masatoshi Bunsen

Proceedings Volume 4930, Advanced Optical Storage Technology; (2002) https://doi.org/10.1117/12.483363
Event: Photonics Asia, 2002, Shanghai, China

Abstract

We propose an all-optical encryption memory using the photorefractive four wave mixing and random phase masks. In our encryption method, the image data are encrypted to white noise by the phase shift patterns added on the signal beam with the image data and the reference beam through the random phase masks. Only reading beam with the phase-conjugated distribution of the reference beam can restore the encrypted data. If the encrypted data are read out by incorrect phase pattern, the output data can't be obtained because of the wavefront mismatch between the recorded hologram and the reading beam. We evaluate the encryption and decryption process by analyzing the diffraction efficiency with consideration of the angular spectrum. We show that high performance encryption that high contrast and high gradation image data can be decrypted accurately and the output data are perfectly dark by using the incorrect decryption key can be realized theoretically.

Citation Download Citation

Akifumi Mita, Atsushi Okamoto, Noriyasu Tsuji, and Masatoshi Bunsen "High performance encryption method and all-optical authentic memory with photorefractive crystal", Proc. SPIE 4930, Advanced Optical Storage Technology, (17 September 2002); https://doi.org/10.1117/12.483363

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