Phase-Only Encryption and Single Path Decryption System Using Phase-Encoded Exclusive-OR Rules in Fourier Domain |
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Authors: | Chang-Mok Shin Soo-Joong Kim |
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Institution: | (1) School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sangyuk-Dong, Buk-Gu, Daegu, 702-701, Republic of Korea |
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Abstract: | A phase-only encryption scheme using phase-encoded exclusive-OR (XOR) rules in a Fourier plane and a single path decryption
system are presented. To generate phase-only encrypted data, a zero-padded original image, multiplied by a random phase image,
is Fourier transformed and its real-valued data is encrypted with key data by using phase-encoded XOR rules. Since the original
information is encrypted on the Fourier plane, the proposed encryption is more tolerant to loss of key information by scratching
or cutting than previous XOR encryption in a space domain. A decryption is simply performed based on 2-f setup with spatial
filter by Fourier transform for multiplication phase-only encrypted data with phase-only key data. Due to single path architecture
without a reference wave, the proposed system is resistant to mechanical vibrations and fluctuation. Numerical simulations
have confirmed the validity of the proposed encryption scheme and simple decryption architecture. |
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Keywords: | optical security system Fourier transform random phase encoding |
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