Optical image encryption method based on row multiplexing compressed ghost imaging and XOR operation

Abstract

The invention provides an optical image encryption method based on row multiplexing compressed ghost imaging and XOR operation. The method includes two processes of optical information encryption andcalculation decryption, for a plurality of images, an encipherer performs sparsification on images to be compressed through integer type wavelet transform and performs scrambling, and the scrambling images are integrated into an xor image through xor operation; the xor image is compressed to a ciphertext image through an improved row multiplexing compressed sensing frame, and ciphertext is published in an open mode; in a compression process, a scrambling key, an xor key and a measurement key are correspondingly generated, and are secretly distributed to different receivers; after receiving thekeys, the receivers utilize the measurement key, the xor key and the scrambling key in sequence to recover an xor image, a scrambling image and a spare image; and finally, a plaintext image is obtained through inverse wavelet transform. The method improves a compressed sensing optical implementation process, reduces key space redundancy, realizes simultaneous encryption and separate decryption ofa plurality of images, effectively enhances encryption capacity of an encryption system, and improves security.

Description

technical field [0001] The invention relates to an optical multiple image encryption method based on line multiplexing compressed ghost imaging and XOR operation, and belongs to the technical field of image encryption. Background technique [0002] In recent years, image encryption technology based on optical information processing has attracted widespread attention. Due to the natural advantages of optical information processing technology, such as parallel data processing capabilities, multi-dimensional coding freedom, and huge key space, it is considered by scholars from all over the world to be a new generation of information security technology. [0003] Compressed sensing, as a new compression acquisition technology in recent years, can realize simultaneous sampling and compression coding of signals, and has been extensively studied in the fields of signal processing and image acquisition. And because it can be conveniently implemented optically using the ghost imagin...

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Problems solved by technology

[0004] However, the currently widely researched optical information security scheme based on compressed ghost imaging has some inherent defects

First of all, ghost imaging based on compressed sensing requires a series of measurement matrices, which makes the encryption system consume a lot of storage and network bandwidth in the process of key storage and distribution.

Secondly, optical encryption methods operate more in the transform domain, and transforms such as fast Fourier transform (FFT) and discrete cosine transform (DCT) are often distributed in real numbers in the transform domain, which is limited by the accuracy of optical devices. cause a huge loss of information

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