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

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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