Author: Wang, Peifeng
Title: Optical information authentication via nonlinear correlation based on computer-generated hologram
Advisors: Chen, Wen (EIE)
Degree: M.Sc.
Year: 2019
Subject: Hong Kong Polytechnic University -- Dissertations
Image processing -- Digital techniques
Data encryption (Computer science)
Information technology -- Security measures
Department: Faculty of Engineering
Pages: iii, 52 pages : color illustrations
Language: English
Abstract: Based on the computer-generated hologram, many optical cryptosystems have been developed for information security. The basic idea of optical information security is to prevent the hack during image transmission. Encrypting the primary image is the most central part of the cryptosystem. After the encryption process, information of the primary image is hidden and not visually distinguished. Then the encrypted data is further sent to the decoder to decrypt the information. Finally, the whole or partial information of the primary image would be exposed, which is used for acomparison with the primary image to calculate the similarity or correlation between them. Many algorithms, such as double random phase encoding, have been developed for encryption. With the technical update iteration, phase retrieval, as a typical encryption technique, has been widely used in optical encryption and authentication.The phase retrieval is chosen as the main encryption method in this dissertation, and a new simple encryption method is proposed. The existing research about optical authentication techniques still does not fully satisfy practical applications, such as a lack of in-depth robustness analysis. Therefore, the demonstration of optical information authentication via nonlinear correlation based on the computer-generated hologram is highly desirable to resolve the existing problems. In this dissertation, a comprehensive robustness analysis is conducted to evaluate the proposed phase-modulated optical cryptosystem, and a new simple encryption method is developed.
Rights: All rights reserved
Access: restricted access

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