Compressive sensing theory-based correlated imaging optical encryption method

Abstract

A compressive sensing theory-based correlated imaging optical encryption method is provided. The compressive sensing theory-based correlated imaging optical encryption method includes the following steps of: (1) encryption: a random modulation signal is adopted as a key, and picture-text information to be encrypted is adopted as a plaintext, and correlation imaging is performed on the key and the plaintext so as to obtain a series of encrypted information, that is a ciphertext; (2) transmission: when information is transmitted, a transmitter and a receiver both share the key, and the ciphertext is transmitted between the transmitter and the receiver; and (3): decryption: compressive sensing calculation is performed on the key and the ciphertext in the decryption, and plaintext information is reconstructed. According to the compressive sensing theory-based correlated imaging optical encryption method of the invention, the key is distributed in a one-time pad manner, the randomness of the key enhances the randomness of the ciphertext, and therefore, the difficulty of deciphering is increased. A compressive sensing algorithm can reconstruct the plaintext under the situation of few sampling times, and therefore, calculation complexity of correlation calculation is decreased, and a new method is provided for correlated imaging optical encryption, and at the same time, more encrypted information can be transmitted under the same calculation times.

Description

technical field [0001] The invention relates to an associated imaging encryption method, in particular to an associated imaging optical encryption method based on the principle of compressed sensing. Background technique [0002] The theoretical basis for correlative imaging optical encryption is the second-order coherence of heat and light. Taking correlative imaging as an example, in general imaging schemes, the transmitted or reflected light field of an object directly carries the spatial information of the object, and imaging detection is inseparable from the object; although correlative imaging also requires detection of the transmitted or reflected light field of the object, the Detectors and objects for spatially resolved measurement tasks can be separated. Therefore, if the light field carrying object information is randomly disturbed, it is difficult to obtain a clear object image with the traditional imaging scheme; while correlation imaging can still obtain a cle...

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Problems solved by technology

Therefore, the obtained plaintext is greatly affected by the number of associated calculations, and the amount of calculation is large, which is not conducive to the decryption of optical encryption.

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