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Selective satellite image compression encryption method based on Chacha20 and CCSDS

An encryption method and satellite image technology, applied in the field of image processing, can solve the problems of satellite image encryption effect, small impact on compression performance, low encryption efficiency, large amount of satellite image data, etc.

Inactive Publication Date: 2016-06-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a selective satellite image compression based on ChaCha20 and CCSDS for the problems of large amount of satellite image data, high value and difficulty in re-acquisition, high encryption strength requirements, poor adaptability of existing encryption algorithms, and low encryption efficiency. Encryption method to achieve good satellite image encryption effect, strong adaptability, and little impact on compression performance

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  • Selective satellite image compression encryption method based on Chacha20 and CCSDS
  • Selective satellite image compression encryption method based on Chacha20 and CCSDS
  • Selective satellite image compression encryption method based on Chacha20 and CCSDS

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0058] Based on the Microsoft VisualStudio2010 integrated development environment, programming development is carried out on a desktop computer with Intel(R) core(TM) i5-3470 3.20GHz and 4GB memory. Select the CCSDS_BPE bit plane encoder to compress and encode in units of segments, and the encoding options are set to: BitPlaneStop=0, StageStop=3, SegByteLimit=0, S=256, and the sub-band weighting coefficients are set as standard coefficients. In this example, six satellite images are selected for encryption simulation experiment, among which the size of marstest and lunar is 512×512, the size of coastal_b1, coastal_b2 and coastal_b7 is 1024×1024, and the size of coastal_b8 is 2048×2048. Use MATLAB2010b to draw graphics.

[0059] Take the marstest image with a size of 512×512 as an example to illustrate the specific encryption steps.

[0060] St...

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Abstract

The invention provides a selective satellite image compression encryption method based on Chacha20 and CCSDS. Aiming the characteristics of a satellite image, the method comprises the steps: firstly carrying out the three-stage two-dimensional discrete wavelet transformation through employing a 9 / 7 integral wavelet in a CCSDS image compression algorithm, and obtaining a DC coefficient and an AC coefficient after transformation; secondly generating a ChaCha20 initial byte stream through the head information in a coding item and a 512-bit initial secret key and ChaCha20 Hash; thirdly carrying out the summation and modular operation of a chaos initial secret key and a plaintext image normalization value through the byte stream generated by PWLCM (Piecewise Linear Chaotic Map) and the ChaCha20 initial byte stream, and generating a ChaCha20 byte stream; fourthly carrying out the XOR encryption of the ChaCha20 byte stream and the DC coefficient and AC coefficient (the father and son coefficients in each block) and all AC coefficient symbol bites; finally enabling the encrypted DC and AC coefficients to be coded and compressed, and completing the compression and encryption of the satellite image. The generation of the ChaCha20 byte stream is related with the to-be-encrypted satellite image and a compression coding parameter, thereby improving the encryption adaptability.

Description

technical field [0001] The invention relates to an image processing method, mainly a satellite image compression and encryption method. Background technique [0002] Satellite images are not limited by national boundaries and regions, and contain rich observation data and intelligence information, which have a profound impact on the global economy, politics, and military affairs. However, there are certain hidden dangers of leaks in the process of storage, transmission, and use. Satellite image encryption technology has important theoretical significance and engineering application value. Compared with general digital image compression and encryption, the satellite image data volume is large, and limited by the transmission bandwidth, it is necessary to compress the satellite image to form a coded data stream before transmission and storage. Therefore, the traditional image compression and encryption algorithm cannot be extended to satellite images. Achieve the best compres...

Claims

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Application Information

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IPC IPC(8): H04N19/63H04N19/46H04N19/122
CPCH04N19/122H04N19/46H04N19/63
Inventor 张绍武宋金林梁颖
Owner NORTHWESTERN POLYTECHNICAL UNIV
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