Image encryption system, image decryption system, image encryption method and image decryption method

An encryption system and image technology, applied in transmission systems, digital transmission systems, encryption devices with shift registers/memory, etc., can solve problems such as being easily cracked, and achieve long-term information protection effects

Active Publication Date: 2016-11-09
SHANGHAI IRAY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an image encryption and decryption system and an image encryption and decryption method to solve the problem that there are loopholes that are easy to be cracked in the prior art because only one layer of encryption is used

Method used

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  • Image encryption system, image decryption system, image encryption method and image decryption method
  • Image encryption system, image decryption system, image encryption method and image decryption method
  • Image encryption system, image decryption system, image encryption method and image decryption method

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Embodiment 1

[0061] see figure 1 , the present invention provides a kind of image encryption system, described image encryption system comprises: cellular automaton 11, and described cellular automaton 11 is suitable for generating the pseudo-random chaotic sequence that is equal to image data with key as seed; The automaton 11 produces complex structures and processes by the simple interaction of a large number of basic constituent units; the pseudo-random chaotic sequence is a digital sequence that has good randomness and can be repeated according to certain rules; the first encryption module 12, The first encryption module 12 is connected to the cellular automaton 11, and is adapted to reversibly mix the pseudo-random chaotic sequence with the corresponding bits of the plaintext of the image data to obtain first encrypted data; The first encryption module 12 is to encrypt the value of the image data itself; the scrambling mapping table generating module 13, the scrambling mapping table ...

Embodiment 2

[0066] see image 3 , the present invention also provides an image encryption method, the image encryption method comprising:

[0067] S20: using the cellular automaton to generate a pseudo-random chaotic sequence with the same length as the image data with the key as the seed;

[0068] S21: Perform reversible information mixing of the pseudo-random chaotic sequence and the plaintext of the image data to obtain first encrypted data;

[0069] S22: Generate a scrambling mapping table according to the pseudo-random chaotic sequence;

[0070] S33: Divide the first encrypted data into multiple data blocks according to the key length, and reorganize the data blocks according to the scramble mapping table to obtain scrambled second encrypted data.

[0071] As an example, reversible information mixing is performed on the pseudo-random chaotic sequence and corresponding bits of the plaintext of the image data to obtain the first encrypted data.

[0072] As an example, in the step S2...

Embodiment 3

[0078] see Figure 4 , the present invention also provides an image decryption system, the image decryption system is connected to the image encryption system described in Embodiment 1, and is suitable for performing the first encryption data and the second encryption data obtained by the image encryption system Decryption, the image decryption system includes: a cellular automaton 31, the cellular automaton 31 is suitable for using a key as a seed to generate a pseudo-random chaotic sequence equal in length to the image data; a scrambling mapping table generation module 32, the setting The random mapping table generation module 32 is connected with the cellular automaton 31, and is adapted to generate a random mapping table according to the pseudo-random chaotic sequence; the first decryption module 33, the first decryption module is connected with the image encryption system and The scrambling mapping table generating modules are connected and adapted to divide the second en...

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Abstract

The invention provides an image encryption system, an image decryption system, an image encryption method and an image decryption method. The image encryption system comprises a cellular automaton, a first encryption module connected with the cellular automation, a scrambling mapping table generation module connected with the cellular automation, and a second encryption module connected with the first encryption module and the scrambling mapping table generation table. Reversible information mixing is carried out at paintext of pseudorandom chaos sequences and image data, thereby, after a numerical value of the image data is encrypted, the data encrypted at the first time is divided into a plurality of data blocks, and the data blocks are recombined according to a scrambling mapping table so as to scramble positions of the data encrypted at the first time, thus, intensity of information chaord is greater, and ciphertext digital sequences are more irregular; that attackers cannot calculate the pseudorandom sequences for the first time encryption through public algorithm details is ensured, technical bugs of the existing algorithm technology are remedied, and long-term information protection for users used to encrypting multiple sets of data with the same key is realized.

Description

technical field [0001] The invention belongs to the technical field of digital image processing and data encryption, and in particular relates to an image encryption and decryption system and an image encryption and decryption method. Background technique [0002] In the existing image encryption technology, a commonly used encryption method is to use the pseudo-random chaotic sequence and the original data of the image to reversibly mix the corresponding positions, so that the mixed data also has random characteristics to achieve the purpose of encryption and decryption. When using the same pseudo-random chaotic sequence to perform inverse transformation and restore it to plaintext. [0003] This encryption method has the risk of being cracked when specific conditions are strictly met. These conditions are: [0004] 1. Users are not used to changing passwords, and use the same key to encrypt image data; [0005] 2. Among the data encrypted with the same key, there is a se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04L9/06
Inventor 宁海涛
Owner SHANGHAI IRAY TECH
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