Hierarchical multiple-image encryption based on the cascaded interference structure and vector stochastic decomposition algorithm. (August 2018)

• Record Type: Journal Article
• Authors: Zhang, Xue; Meng, Xiangfeng; Wang, Yurong; Yang, Xiulun; Yin, Yongkai; Li, Xianye; Peng, Xiang; He, Wenqi; Dong, Guoyan; Chen, Hongyi
• Is Part Of: Optics and lasers in engineering. Volume 107(2018)
• Page Start: 258
• Page End: 264
• Publication Date: 2018-08
• Subjects: Image encryption -- Digital image processing -- Interference; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2018.04.002
• Languages: English
• ISSNs: 0143-8166

Abstract

Highlights: The hierarchical multiple-image encryption based on the cascaded interference structure and vector stochastic decomposition algorithm is proposed. It realizes different level of accessibility to the secret data for different encryption levels with the same cascaded cryptosystem. It removes the silhouette problem in the traditional two-beam interference cryptosystem, and achieves high quality of the decrypted images. Abstract: A new kind of hierarchical multiple-image encryption method based on the cascaded interference structure and vector stochastic decomposition algorithm is proposed. In this method, by using the nonequal modulus decomposition and vector stochastic decomposition algorithm, the K th-level secret image modulated by a random phase distribution is analytically encoded into a K th-level phase-only mask (POM) key and the ( K −1)th-level complex amplitude field whose real amplitude is the ( K −1)th-level secret image. Then, served as the input condition, the generated complex amplitude field is further encoded into a ( K −1)th-level POM key and the ( K −2)th-level complex amplitude, and so on, until the 1st-level complex amplitude field is decomposed into two POMs: one is the 1st-level key, and the other is the ciphertext. When decryption occurs, only when the high-level users simultaneously obtain all the phase keys, the correct sequential orders of phase keys, and the correct geometrical parameters, all the secret images are retrieved successfully. Both theoretical analysis and numerical simulations verify the feasibility of this method.