MISC

2004年

Effect of random phase mask on input plane in photorefractive authentic memory with two-wave encryption method

ADVANCED OPTICAL AND QUANTUM MEMORIES AND COMPUTING
  • A Mita
  • ,
  • A Okamoto
  • ,
  • H Funakoshi

5362
開始ページ
61
終了ページ
68
記述言語
英語
掲載種別
DOI
10.1117/12.528717
出版者・発行元
SPIE-INT SOC OPTICAL ENGINEERING

Two-wave encryption method has the feature that the output data are transformed into white-noise data with extremely low intensity in the retrieving process with the incorrect key. In this method, the random phase mask on the input plane plays important roles in prohibiting decryption from a white-noise data to the original image by the blind deconvolution method. Blind deconvolution method is for obtaining the original image from white-noise data by iterative operation. Without this mask, when unauthorized users observe the output beam by using CCD in the readout with the plane wave, the completely same intensity distribution as that of Fourier transform of the original image is obtained. Therefore the encrypted image will be decrypted easily. However in using this mask, even if unauthorized users observe the output beam using the same method, the encrypted image cannot be decrypted because the observed intensity distribution is dispersed at random by this mask. Thus the high security authentic memory system can be realized by using this mask. In the double phase encryption method, data can be protected by transforming the original data into white-noise data with two random phase masks on the object beam. Our encryption method has the additional function that unlawful access is easily detectable because the output beam intensity significantly falls down by unlawful access. However it has not been investigated about randomness of this mask required to make this encryption method operate efficiently. In this report, we investigate the randomness of this mask required to realize the high security memory system by simulation with various input plane phase masks. We show the security of this encryption method can be drastically improved as the correlation coefficient between the original image and the output image decreases from 0.3 to 0.1.

リンク情報
DOI
https://doi.org/10.1117/12.528717
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000222821100007&DestApp=WOS_CPL
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=3543111404&origin=inward
ID情報
  • DOI : 10.1117/12.528717
  • ISSN : 0277-786X
  • Web of Science ID : WOS:000222821100007

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