Abstract
The ability of metamaterials to manipulate optical waves in both the spatial and spectral domains has provided new opportunities for image encoding. Combined with the recent advances in hyperspectral imaging, this suggests exciting new possibilities for the development of secure communication systems. While traditional image encryption approaches perform a 1-to-1 transformation on a plain image to form a cipher image, we propose a 1-to-n transformation scheme. Plain image data is dispersed across n seemingly random cipher images, each transmitted on a separate spectral channel. We show that the size of our key space increases as a double exponential with the number of channels used, ensuring security against both brute-force attacks and more sophisticated attacks based on statistical sampling. Moreover, our multichannel scheme can be cascaded with a traditional 1-to-1 transformation scheme, effectively squaring the size of the key space. Our results suggest exciting new possibilities for secure transmission in multi-wavelength imaging channels.
Highlights
The ability of metamaterials to manipulate optical waves in both the spatial and spectral domains has provided new opportunities for image encoding
The images measured on each channel serve as cipher images, from which the intended recipient can recover the original image by using a decryption key
We evaluate the security of the encryption scheme against a more sophisticated attack, one based on statistical sampling of the key space
Summary
The ability of metamaterials to manipulate optical waves in both the spatial and spectral domains has provided new opportunities for image encoding. Our results suggest exciting new possibilities for secure transmission in multi-wavelength imaging channels. Metamaterials can be used to create multiplexed holograms on independently measured wavelength c hannels[28,29,30] This capability suggests intriguing new possibilities for spatial and spectral encryption. Unlike traditional image encryption schemes, which transform the image into a single cipher image[34,35,36,37,38,39,40,41,42] (1-to-1 transformation), our scheme performs a 1-to-n transformation to distribute the image across multiple wavelength channels (see Fig. 1). Our multi-spectral encryption scheme can be cascaded with traditional 1-to-1 image encryption approaches, effectively introducing a new dimension of security in transmission
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