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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

The security analysis and improved scheme of random phase encoding technique

Xu Wu, Jiasheng Hu

Published Jan 26, 2006• 0 citations
Publisher

Abstract

The robustness and security of random phase encoding technique are analyzed. We study the tolerance to data loss of the decrypting key for binary text and a grayscale image. To enhance the security, an improved phase coding scheme based on the chaos theory is proposed. The proposed optical setups for image decryption are depicted. The analyses show that the improved scheme can effectively improved the security.

DOI
10.1117/12.668184

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The robustness and security of random phase encoding technique are analyzed. We study the tolerance to data loss of the decrypting key for binary text and a grayscale image. To enhance the security, an improved phase coding scheme based on the chaos theory is proposed. The proposed optical setups for image decryption are depicted. The analyses show that the improved scheme can effectively improved the security.
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In this paper, we demonstrate a security system by using optical interference and phase retrieval algorithm (PRA) techniques. The modified PRA is proposed to encode the target image into random phase distribution. Optical and digital methods can be used for decryption. By using this method, silhouette elimination is realized. In addition, due to this simplified system design, the iterative rate is improved and the optical decryption realization is easier. Validity and performance of the proposed system are demonstrated by means of numerical simulations. The system encryption capacity as to both binary and gray images is numerically investigated. Then, the decryption procedure is demonstrated by optical experiment means and the decryption result is given.
In this paper, we proposed an optical security system based on a gray-image exclusive-OR encryption using multi-phase separation and phase-wrapping method. For encryption, a gray image is sliced into binary images, which have the same pixel value, and these images are encrypted by modified XOR rules with binary random images. The XORed images and the binary images respectively combined and converted into full phase images, called an encrypted image and a key image. For decryption, when the encrypted image and key image are used as inputs on optical elements, Practically due to limited controllability of phase range in optical elements, the original gray image cannot be efficiently reconstructed by these optical elements. Therefore, by decreasing the phase ranges of the encrypted image and key image using a phase-wrapping method and separating these images into low-level phase images using multi-phase separation, the gray image can be reconstructed by optical elements which have limited control range. The decrytion process is simply implemented by interfering a multiplication result of encrypted image and key image with reference light. The validity of proposed scheme is verified and the effects, which are caused by phase limitation in decryption process, is analyzed by using computer simulations.
We propose a security-enhanced double-random phase encryption (DRPE) scheme using orthogonally encoded image and electronically synthesized key data to cope with the security problem of DRPE technique caused by fixed double-random phase masks for encryption.In the proposed scheme, we adopt the electronically synthesized key to frequently update the phase mask using a spatial light modulator, and also employ the orthogonal encoding technique to encode the image and electronically synthesized key data, which can enhance the security of both data.We provide detailed procedures for encryption and decryption of the proposed scheme, and provide the simulation results to show the encryption effects of the proposed scheme.