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10 October 2020 Cryptanalysis of phase-truncated Fourier-transforms-based optical cryptosystem using an untrained neural network
Wenqi He, Shuixin Pan, Meihua Liao, Dajiang Lu, Qi Xing, Xiang Peng
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Proceedings Volume 11549, Advanced Optical Imaging Technologies III; 115491W (2020) https://doi.org/10.1117/12.2583396
Event: SPIE/COS Photonics Asia, 2020, Online Only
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Abstract
Optical cryptosystem based on phase-truncated-Fourier-transforms (PTFT) is one of the most interesting optical cryptographic schemes due to its unique mechanism of encryption/decryption. Conventional learning-based attack method need a large number of plaintext-ciphertext pairs to train a neural network and then predict the plaintexts from subsequent ciphertexts. In this work, we propose an alternative method of attack on PTFT-based optical asymmetric cryptosystem by using an untrained neural network. We optimize the parameters of a neural network with the help of the encryption model of PTFT-based cryptosystem, hoping to get the ability of retrieving any plaintext from the corresponding unknown ciphertext but without help of the decryption keys. The proposed untrained-neural-network-based attack approach eliminates the requirement of tens of thousands of training images and might open up a new avenue for optical cryptanalysis.
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Wenqi He, Shuixin Pan, Meihua Liao, Dajiang Lu, Qi Xing, and Xiang Peng "Cryptanalysis of phase-truncated Fourier-transforms-based optical cryptosystem using an untrained neural network", Proc. SPIE 11549, Advanced Optical Imaging Technologies III, 115491W (10 October 2020); https://doi.org/10.1117/12.2583396
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KEYWORDS
Neural networks
Cryptanalysis
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