Abstract
Abstract Multi-channel information encryption technology has been implemented by optical metasurfaces owing to their superior ability to control the phase, amplitude, wavelength and polarization of incident light. However, current metasurface-based multi-channel encryption technologies suffer from information leakage in non-full channel decoding processes. To better increase the security of the encrypted information, we develop a secret shared phase encoding scheme by combining a visual secret sharing scheme with a metasurface-based phase-encoding technique. Our method achieves its high-concealment through mapping the target image into a set of unrecognizable phase-only keys that are subsequently encoded by a multi-wavelength metasurface. In the decryption process, the secret information can be reconstructed only by decoding and stacking all the wavelength channels of the metasurface. At the same time, chaotic images can be extracted from the other channels without revealing any original information. The simulated results and the theoretical analysis show the strong robustness and high security of our encryption setup, which is sure to find applications in emerging optical encryption schemes.
Highlights
With the increasing importance of information security, numerous cryptographic techniques using optical means by manipulating the features of the optical wave-front of an information-carrying beam have been proposed and developed [1]
Our method achieves its high-concealment through mapping the target image into a set of unrecognizable phase-only keys that are subsequently encoded by a multi-wavelength metasurface
Optical metasurfaces [2,3,4,5,6], the ultrathin synthesized engineering interfaces consisting of sub-wavelength unit cells, are emerging as promising candidates for information security applications owing to their offered superior capability in manipulating phase, amplitude, wavelength and polarization as information security keys
Summary
With the increasing importance of information security, numerous cryptographic techniques using optical means by manipulating the features of the optical wave-front of an information-carrying beam have been proposed and developed [1]. It has been reported that information encryption could be realized by optical metasurface holography [7,8,9,10], which provides an effective way to imprint the secret information by transforming the visible target images into the unrecognizable phase-only distributions based on phase-encoding technology [11,12,13,14]. Information encryption based on multi-channel metasurface encoding approaches can dramatically improve information security owing to combining multiple possible degrees of freedom. Three visible wavelengths of red, green and blue are chosen as three independent channels to encode the target images of the three SKs, respectively These SKs are transformed into the corresponding phase-only keys (POKs) by multiwavelength phase encoding and encoded into the metasurface. Any other illumination sequence would only generate a nonsensical image (or chaotic image) with no valuable information
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
