The keyed optical Hash function based on cascaded phase-truncated Fourier transforms |
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Authors: | Wenqi He Wan Qin Xiangfeng Meng |
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Affiliation: | College of Optoelectronics Engineering, Shenzhen University, Key Laboratory of Optoelectronic Devices and Systems, Education Ministry of China, Shenzhen 518060, China |
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Abstract: | An approach for constructing keyed optical Hash function (KOHF) is proposed, which is based on cascaded phase-truncated Fourier transforms (CPTFTs). The KOHF is created from a two-step one-way encryption process with a secret key imbedded. The non-linearity and one-way functionality is introduced by cascaded optical Fourier transforms with the phase-truncation operations, which could be implemented either digitally or optically. Once two 64-bit keyed Hash values are obtained in the two-step one-way encryption processes, respectively, they are then combined to form a final 128-bit keyed Hash value, which can also be regarded as a message authentication code (MAC). Moreover, the avalanche effect is also evaluated to show the performance of constructed KOHF with a set of numerical experiments. |
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Keywords: | Fourier optics Optical system design Hybrid systems Image processing |
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