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Optical Engineering • Open Access

Asymmetric double-image encryption method by using iterative phase retrieval algorithm in fractional Fourier transform domain
Author(s): Liansheng Sui; Haiwei Lu; Xiaojuan Ning; Yinghui Wang

Paper Abstract

A double-image encryption scheme is proposed based on an asymmetric technique, in which the encryption and decryption processes are different and the encryption keys are not identical to the decryption ones. First, a phase-only function (POF) of each plain image is retrieved by using an iterative process and then encoded into an interim matrix. Two interim matrices are directly modulated into a complex image by using the convolution operation in the fractional Fourier transform (FrFT) domain. Second, the complex image is encrypted into the gray scale ciphertext with stationary white-noise distribution by using the FrFT. In the encryption process, three random phase functions are used as encryption keys to retrieve the POFs of plain images. Simultaneously, two decryption keys are generated in the encryption process, which make the optical implementation of the decryption process convenient and efficient. The proposed encryption scheme has high robustness to various attacks, such as brute-force attack, known plaintext attack, cipher-only attack, and specific attack. Numerical simulations demonstrate the validity and security of the proposed method.

Paper Details

Date Published: 4 March 2014
PDF: 11 pages
Opt. Eng. 53(2) 026108 doi: 10.1117/1.OE.53.2.026108
Published in: Optical Engineering Volume 53, Issue 2
Show Author Affiliations
Liansheng Sui, Xi'an Univ. of Technology (China)
Haiwei Lu, Xi'an Univ. of Technology (China)
Xiaojuan Ning, Xi'an Univ. of Technology (China)
Yinghui Wang, Xi'an Univ. of Technology (China)

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