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optical Image encryption and decryption Considering Wireless Communication Channels

JOURNAL OF INFORMATION PROCESSING SYSTEMS 2014年第2期10卷 215-222页

作者： Cho, Myungjin Lee, In-Ho Hankyong Natl Univ Dept Elect Elect & Control Engn Anseong 456749 South Korea

In this paper, we discuss optical encryption and decryption considering wireless communication channels. In wireless communication systems, the wireless channel causes noise and fading effects of the transmitted information. optical encryption technique such as double-random-phase encryption (DRPE) is used for encrypting transmitted data. When the encrypted data is transmitted, the information may be lost or distorted because there are a lot of factors such as channel noise, propagation fading, etc. Thus, using digital modulation and maximum likelihood (ML) detection, the noise and fading effects are mitigated, and the encrypted data is estimated well at the receiver. To the best of our knowledge, this is the first report that considers the wireless channel characteristics of the optical encryption technique.

关键词： optical encryption and decryption Wireless Communication Channels

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optical double-image cryptosystem based on interference principle and spatial encoding

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Optik 2025年 329卷

作者： Khalf, Hawraa A. Mohammed, Emad A. Department of Physics College of Science University of Basrah Iraq General Directorate of Education in Missan Ministry of Education Iraq

We propose a novel optical double-image encryption and decryption method by integrating a cryptosystem based on the optical interference principle with a spatial encoding technique. This proposed integration overcomes the silhouette problem of the discloser of input image information;thus, it increases the security level of the overall process. Not only the security is increased but also the capacity for signal hiding is fulfilled for cryptosystems based on interference. In this work, the two Angio retina images, which are very effective for verification purposes, are considered as input images to validate the authorization of the two biometric users. An attack analysis is performed to check the robustness of the proposed cryptosystem. The performance and effectiveness of the system are verified by numerical simulations. © 2025 Elsevier GmbH

关键词： Double-image Interference optical encryption and decryption Silhouette problem Spatial encoding

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A novel four image encryption approach in sparse domain based on biometric keys

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MULTIMEDIA TOOLS AND APPLICATIONS 2023年第15期82卷 22889-22904页

作者： Verma, Gaurav He, Wenqi Peng, Xiang Gautam Buddha Univ Sch Informat & Commun Technol Greater Noida 201312 India B K Birla Inst Engn & Technol Dept Elect & Commun Engn Pilani 333031 Rajasthan India Shenzhen Univ Coll Phys & Optoelect Engn Key Lab Optoelect Devices & Syst Minist Educ & Guangdong Prov Shenzhen Peoples R China

In this paper, a novel four-image encryption method using biometric keys based on a compressive phase retrieval algorithm is proposed. In the encryption procedure, each input image to be encrypted is initially encoded in sparse data by using a phase retrieval algorithm, which is further combined with a distinct biometric phase mask key. This approach increases the non-linearity of the encryption process and also offers an additional layer of system security against unauthorized attacks. In the system, multiple phase keys from a single biometric hologram by changing the reconstruction parameters during the numerical reconstruction process are generated. The digital nature of the key generation process makes it available at encryption and decryption stages. In addition, the advantage associated with the proposed scheme is related to achieve in reducing space for data storage and transmission over a communication channel. The algorithms to implement the proposed scheme are discussed, and the results of the numerical simulations have presented the effectiveness of the proposed four-image encryption scheme that exhibits better performance in comparison to the reported methods.

关键词： optical encryption and decryption Fourier transform And phase retrieval algorithm

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An optical asymmetric encryption scheme with biometric keys

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OPTICS AND LASERS IN ENGINEERING 2019年第May期116卷 32-40页

作者： Verma, Gaurav Liao, Meihua Lu, Dajiang He, Wenqi Peng, Xiang Sinha, Aloka Shenzhen Univ Coll Optoelect Engn Minist Educ & Guangdong Prov Key Lab Optoelect Devices & Syst Shenzhen 518060 Peoples R China Indian Inst Technol Delhi Dept Phys New Delhi 110016 India

In this paper, an asymmetric cryptosystem for optical image encryption using biometric keys is proposed based on the phase retrieval algorithm and the phase-truncated Fourier transforms (PTFT) scheme which addresses the issue of key distribution with enhanced security in the optical encryption process. In the proposed system, the encryption keys include optically generated biometric keys and the random phase mask keys of the PTFT scheme, while the decryption keys are kept as the private key in terms of the binary key and the generated phase-only mask of the PTFT scheme. If a person is authorized to retrieve the biometric keys by providing the fingerprint hologram and reconstruction parameters at the receiver stage, then the proposed system satisfies the criteria of asymmetric cryptography with information authentication approach. The biometric key features, by using the digital holography are kept secure and is utilized in both the encryption and decryption operations so that the authenticity of the ciphertext by using the biometric keys can be verified during the decryption process. Numerical simulations are carried out to test the effectiveness and validity of the proposed system.

关键词： optical encryption and decryption Authentication Digital holography Asymmetric cryptosystem Fingerprint biometric key

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Chaos-based optical cryptosystem with key management

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JOURNAL OF OPTICS-INDIA 2024年 1-15页

作者： Verma, Gaurav LNM Inst Informat Technol Dept Commun & Comp Engn Jaipur 302031 Rajasthan India

optical-based cryptosystems have been a promising area of research for secure and reliable data transfer via communication networks in recent years. This paper introduces an optical cryptosystem with enhanced security for image encryption that combines an optical phase retrieval technique with a chaotic map. In the process, a modified phase retrieval technique is used to transform the plaintext into phase-only data, and a pixel scrambling transform is applied to disorganize the phase data. To secure the encoding procedure, chaotic phase mask keys combined with scrambled phase data are used. Additionally, an operation of phase-truncated Fourier transform is applied to produce the ciphertext. The chaos and pixel scrambling transform parameters are required to recover the input data during the decryption process. Moreover, if the person who is exchanging the parameters has system access, the decryption process proceeds in a way that ensures authentication. The proposed cryptosystem makes it easier to implement optical encryption and decryption processes for digital and hardware platforms. The simulation experiment results demonstrate that this idea offers strong security against unauthorized attempts and other possible threats in addition to reliable performance.

关键词： Fourier transform Image security Chaotic phase mask optical encryption and decryption

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Fast optimization of binary encrypted hologram based on error correction method in optical security systems

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optical REVIEW 2007年第5期14卷 290-296页

作者： Nakayama, Keizo Ohtsubo, Junji Kinki Univ Sch Sci & Engn Osaka 5778502 Japan Shizuoka Univ Fac Engn Hamamatsu Shizuoka 4328561 Japan

In practical optical security systems we must consider various circumstances for reading and decrypting encrypted holograms. Binarization of the hologram is best suited for such applications because of the ease of handling encrypted data. However, the decrypted image is greatly degraded by binarization. Therefore, optimization of a binary hologram is essential in using such a technique. In this paper, we propose a fast optimization method of a binary encrypted hologram to obtain a good reconstruction based on the error correction algorithm. In the proposed method, multiple pixels of the binary hologram are simultaneously flipped for the optimization according to the priority for the correction. The time for the optimization is only 3% of that of the simulated annealing method. (C) 2007 The optical Society of Japan.

关键词： optical security systems optical encryption and decryption optimization of binary hologram

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Optimization of binary hologram degraded by periodic lattice structure of liquid-crystal device panel in real optical security systems

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optical REVIEW 2007年第5期14卷 266-270页

作者： Ohtsubo, Junji Fujimoto, Ayano Shizuoka Univ Fac Engn Hamamatsu Shizuoka 4328561 Japan

A numerically generated encryption pattern in practical optical security systems is processed through real display devices such as electronically addressed spatial liquid-crystal devices (LCDs). The pattern to be encrypted must be therefore congenial with electronic inter-faces. In usual fact, the quality of a decrypted image in a practical system is greatly degraded due to the mismatch between the desired encryption pattern and the generated pattern without consideration of the device structures, such as lattice structures of LCDs. We take into account lattice structures for the displays of encryption and key patterns in real optical security systems and apply a simulated-annealing like method for the optimization of an encrypted binary hologram. We successfully demonstrate the decryption of holograms by this method. (C) 2007 The optical Society of Japan.

关键词： optical security system optical encryption and decryption optimization of binary hologram joint Fourier transform

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optical encryption of personal identification information using orthogonal code

Optical encryption of personal identification information us...

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Conference on Optics and Photonics in Global Homeland Security II

作者： Islam, Mohammed Nazrul Alam, Mohammad S. Univ S Alabama Dept Elect & Comp Engn Mobile AL 36688 USA

ISBN: (纸本)0819462594

optical information processing techniques have been developed for information security and fraud deterrent applications. Several encryption methods have been proposed in the literature, which includes optical double randomphase encryption, polarization encoding, encryption and verification using a multiplexed minimum average correlation energy phase-encrypted filter. All these reports employed a pseudo-random number for the code. But as such numbers are not uncorrelated, the security is not guaranteed because a wrong code may also extract some of the features of the coded information. The objective of the paper is to develop an optical security system employing orthogonal code for protection of personal identification information. As the orthogonal codes have zero or minimum cross-correlation depending on the offset between the codes, a wrong code can not decrypt any information. Here a simple encryption technique is proposed in spatial domain, where the input images are first spread in one dimension using an optical lens and then multiplied by the respective code. Finally, the individual encrypted images are superimposed on a common spatial domain. The individual images can then be decrypted by correlating the received signal with the respective address code. Computer simulation results show that any information containing binary characters can be encrypted and then decrypted successfully. The encrypted images are found to be secure, because no unwanted reproduction is possible without having the appropriate code. The technique also offers an efficient use of the storage or transmission capacity. Therefore, the proposed optical encryption technique can be applied to securing personal identification or similar information.

关键词： optical security orthogonal coding optical inforination processing optical encryption and decryption

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Double random phase encoding using phase reservation and compression

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JOURNAL OF OPTICS 2014年第2期16卷 025402-25401页

作者： Chen, Wen Chen, Xudong Natl Univ Singapore Dept Elect & Comp Engn Singapore 117583 Singapore

In recent years, various studies have been conducted to illustrate the vulnerability of double random phase encoding (DRPE). In this paper, we propose a novel method via phase reservation and compression to enhance DRPE security. Only a compressed phase distribution is available in the CCD plane, and the amplitude component is not available or requested for optical decryption. Since only noise-like distributions can be obtained by using the correct security keys during optical decryption, a nonlinear correlation algorithm is further applied for authenticating the decrypted image. It is demonstrated that valid conditions for attack algorithms are broken and high security can be achieved for the DRPE system.

关键词： optical encryption and decryption double random phase encoding phase reservation phase compression information authentication

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Generalized description of double random phase encoding by Collins diffraction transformation

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JOURNAL OF OPTICS 2019年第1期21卷 015703-015703页

作者： Kwak, Chong Hoon Javidi, Bahram Yeungnam Univ Dept Phys Kyongsan 712749 South Korea Univ Connecticut Dept Elect & Comp Engn Storrs CT 06269 USA

We present a generalized theory for describing encryption and decryption by using the double random phase encoding (DRPE) technique under the framework of the Collins diffraction transform formalism. The theory covers to a variety of diffraction domain which includes the Fourier domain (conventional 4f-optical processor), the Fresnel domain and the fractional Fourier transform (FRFT) domain. From the theoretical basis developed in this work, we present novel optical DRPE systems such as Gaussian imaging DRPE, inverse operation DRPE and Fresnel diffraction DRPE systems, which are plausible to implement. It is shown that the maximum number of degrees of freedom (or independent design parameters) of proposed DRPE system increases four times, when compared with the conventional 4f-optical system, which guarantee much more secure encryption and decryption.

关键词： optical encryption and decryption Collins diffraction transformation double random phase masks

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