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http://dx.doi.org/10.3807/KJOP.2006.17.3.248

Optical Encryption using a Random Phase Image and Shift Position in Joint Transform Correlation Plane  

Shin, Chang-Mok (School of Electrical Engineering & Computer Science, Kyungpook National University)
Lee, Woo-Hyuk (School of Electrical Engineering & Computer Science, Kyungpook National University)
Cho, Kyu-Bo (School of Electrical Engineering & Computer Science, Kyungpook National University)
Kim, Soo-Joong (School of Electrical Engineering & Computer Science, Kyungpook National University)
Seo, Dong-Hoan (Division of Electrical and Electronics Engineering, Korea Maritime University)
Lee, Sung-Geun (Division of Electrical and Electronics Engineering, Korea Maritime University)
Publication Information
Korean Journal of Optics and Photonics / v.17, no.3, 2006 , pp. 248-255 More about this Journal
Abstract
Most optical security systems use a 4-f correlator, Mach-Zehnder interferometer, or a joint transform correlator(JTC). Of them, the JTC does not require an accurate optical alignment and has a good potential for real-time processing. In this paper, we propose an image encryption system using a position shift property of the JTC in the Fourier domain and a random phase image. Our encryption system uses two keys: one key is a random phase mask and the other key is a position shift factor. By using two keys, the proposed method can increase the security level of the encryption system. An encrypted image is produced by the Fourier transform for the multiplication image, which resulted from adding position shift functions to an original image, with a random phase mask. The random phase mask and position shift value are used as keys in decryption, simultaneously. For the decryption, both the encrypted image and the key image should be correctly located on the JTC. If the incorrect position shift value or the incorrect key image is used in decryption, the original information can not be obtained. To demonstrate the efficiency of the proposed system, computer simulation is performed. By analyzing the simulation results in the case of blocking of the encrypted image and affecting of the phase noise, we confirmed that the proposed method has a good tolerance to data loss. These results show that our system is very useful for the optical certification system.
Keywords
Joint transform plane; Random phase image; Phase shift variable;
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