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Space domain image encryption and decryption method based on modern cryptosystem

A modern cipher, encryption and decryption technology, applied in the field of airspace image encryption and decryption, to achieve the effect of increasing difficulty, improving image encryption and decryption efficiency, and high autocorrelation

Active Publication Date: 2021-05-28
TIANJIN NAVIGATION INSTR RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the application process of information hiding technology, the research found that simply using various information hiding algorithms to hide secret information, the attacker is likely to extract the secret information easily

Method used

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  • Space domain image encryption and decryption method based on modern cryptosystem
  • Space domain image encryption and decryption method based on modern cryptosystem
  • Space domain image encryption and decryption method based on modern cryptosystem

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Embodiment Construction

[0061]The present invention will be described in further detail below in conjunction with the drawings and specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0062] A Method of Encryption and Decryption of Airspace Image Based on Modern Cryptosystem

[0063] Step 1: Convert RGB color image to grayscale image

[0064] Get the grayscale image of the truecolor image.

[0065] 1) The commonly used formula for converting an RGB color image to a grayscale image is;

[0066] Gray ij =R ij *0.299+G ij *0.587+B ij *0.114………………(2)

[0067] 2) For high-pixel and large-size true-color images, a large number of floating-point calculations consumes a lot of processor resources. In order to improve the calculation speed, quickly obtain grayscale images, and avoid using floating-point calculations, this method directly performs bit operations on the values. The 16th power of 2 is 65536, so t...

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Abstract

The invention relates to a spatial domain image encryption and decryption method based on a modern cryptosystem. The method comprises the following steps: step 1, converting an RGB color image into an original grey-scale image; step 2, carrying out encryption processing on the image; 2.1, five secret key graphs are selected, and the coefficients of the secret key graphs are set; 2.2, encrypting the original grey-scale map by using the five secret key maps to obtain a new grey-scale map; 2.3, performing XOR processing on the new grey-scale map to obtain a transmission image; and step 3, decrypting the image: 3.1, carrying out inverse XOR processing on the received transmission image to obtain a grey-scale map; and 3.2, decrypting the image according to a key graph and a coefficient of a pre-agreed key library to obtain an original grayscale image. According to the method, the original image is encrypted, decrypted and restored.

Description

technical field [0001] The invention belongs to the field of information technology, and relates to a method for encrypting and transmitting image information, in particular to an airspace image encryption and decryption method based on a modern cryptosystem. Background technique [0002] Image information is vivid and vivid, thus becoming an important means for human beings to express information. But at the same time, it is also faced with the fact that information is leaked, tampered and counterfeited. At present, ensuring the security of information has become a research hotspot in information technology. In the application process of information hiding technology, the study found that simply using various information hiding algorithms to hide secret information, the attacker is likely to extract the secret information easily. Therefore, certain encryption operations can be performed on the secret information before information hiding. Then hide it in the carrier infor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/467H04N21/2347H04N21/4405
CPCH04N19/467H04N21/2347H04N21/4405Y02D30/50
Inventor 赵申卫周智楠韩旭董弘健马兰
Owner TIANJIN NAVIGATION INSTR RES INST
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