Abstract
In this paper, an asymmetric multiple-image encryption based on equal modulus decomposition (EMD) and frequency modulation is proposed. First, every original image is frequency modulated by its corresponding predesigned phase function. Then a multiplexed spectrum can be obtained by multiplexing the extracted spectrums, which are extracted from the Fourier spectrums of original images via a filtering procedure. After inversely Fourier transforming the multiplexed spectrum, the obtained multiplexed image is further encoded by EMD. Compared with the previous EMD, the scheme gains higher security due to the lack of public keys. The encryption principle is described in detail and various numerical simulation results are presented to demonstrate the feasibility and security of our proposal.
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