Abstract
Optical technologies have been widely used in information security owing to its parallel and high-speed processing capability. However, the most critical problem with current optical encryption techniques is that the cyphertext is linearly related with the plaintext, leading to the possibility that one can crack the system by solving a set of linear equations with only two cyphertext from the same encryption machine. Many efforts have been taken in the last decade to resolve the linearity issue, but none of these offers a true nonlinear solution. Inspired by the recent advance in spatial nonlinear optics, here we demonstrate a true nonlinear optical encryption technique. We show that, owing to the self-phase modulation effect of the photorefractive crystal, the proposed nonlinear optical image encryption technique is robust against the known plaintext attack based on phase retrieval. This opens up a new avenue for optical encryption in the spatial nonlinear domain.
Highlights
Light, as a carrier of information, poccesses a number of unique features that can be processed to secure information
In comparison with the linear counterpart [48], the proposed nonlinear encryption engine is more sensitive to the transverse translation of R 2, as one can see from the inset in Fig. 3a that the position mismatch of lx/2 is sufficient to make the decrypted image totally corrupted
3 Conclusion In conclusion, we have experimentally demonstrated for the first time a true nonlinear optical encryption method
Summary
As a carrier of information, poccesses a number of unique features that can be processed to secure information. We focus on the toleration to the misalignment of the random phases along the transverse and longitudinal directions and to the change of nonlinearity strength for decryption with respect to that for encryption.
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