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Digital audio signal encryption with a virtual optics scheme

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A novel approach for enciphering digital audio signal is presented in this article. The operating principle of the approach is on the basis of a virtual optics scheme whereby we apply both virtual wavelength and virtual diffraction distance in conjunction with a complex-valued random mask to design multiple-locks and multiple-keys in the course of audio data encryption and decryption. The audio signal is converted into a sound map, thus the encoded sound map can be encrypted as done for an image. Numerical experiment results show that proposed method is with high sensitivity to parameter discrepancy of virtual optical scheme. The correlation analysis of decrypted audio signal in comparison with original signal is also performed to verify the capability of presented virtual optics scheme for audio signal encryption.

Document Type: Research Article


Affiliations: 1: Institute of Optoelectronics, Shenzhen University and Key Laboratory of Optoelectronics Devices and Systems, 518060 Shenzhen, Guangdong Province, P.R. China 2: National Laboratory of Precision Measurement Technology and Instrumentation, Tianjin University, 300072 Tianjin, China 3: Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

Publication date: 2003-05-01

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