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Asymmetric double-image encryption and decryption method based on chaos and cascade DFrRT

An encryption method and asymmetric technology, applied in the field of virtual optical information encryption and decryption, can solve the problems of low security of symmetric cryptosystem, easy to attack linear system, etc., to enhance nonlinearity and disorder, resist conventional attacks, The effect of enhancing security

Inactive Publication Date: 2014-09-17
XIAN UNIV OF TECH
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Problems solved by technology

[0008] The purpose of the present invention is to propose an encryption method based on chaos and cascaded DFrRT asymmetric double images, which solves the problems of low security of symmetric cryptosystem and easy attack of linear system existing in the prior art

Method used

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  • Asymmetric double-image encryption and decryption method based on chaos and cascade DFrRT
  • Asymmetric double-image encryption and decryption method based on chaos and cascade DFrRT
  • Asymmetric double-image encryption and decryption method based on chaos and cascade DFrRT

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[0103] see figure 1 , with two 256×256 grayscale original grayscale images f 1 and f 2 , first put f i (i=1,2) normalized, and then concatenate the two images horizontally into an expanded image f of size 256×512 e . Scrambling the expanded image f using i times of cat map mapping e , where, by two initial values ​​χ 01 , χ 02 ,y 0 (K represents the number of chaotic numbers to be discarded) The chaotic sequence s generated by the logistic mapping 1 and s 2 As the initial value p of the cat map map i and q i , get the scrambled image f′ e , the scrambled image f′ e Use the inverse operation of step 1 to decompose to get two new images f′ i (i=1,2). Generate two phase masks by generating a phase mask procedure and Based on the image f' 1 . put f' 2 with phase mask Convolution is performed on the obtained complex matrix based on Logistic mapping, and the random transformation of discrete fractions with order α is obtained to obtain the transformed result h...

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Abstract

The invention discloses an asymmetric double-image encryption method based on chaos and cascade DFrRT. The encryption method comprises the steps that two original gray level images are normalized and connected into an extension image in the horizontal direction; next, the extension image is scrambled by i times of cat mapping, and then the extension image is decomposed into two new images; two phase masks are generated through the image f'1, and the image f'2 and one phase mask are subjected to convolution; Logistic mapping is conducted on an obtained complex matrix, and a conversion result is obtained through DFrRT conversion with the order of alpha; the amplitude of the complex matrix is extracted, and the amplitude and the other phase mask are subjected to convolution; Logistic mapping is conducted on an obtained second complex matrix, and a conversion result is obtained through DFrRT conversion with the order of beta; the amplitude of the second complex matrix is extracted, and then a final ciphertext image is obtained. The invention further discloses a corresponding decryption method. By means of the asymmetric double-image encryption and decryption method, the nonlinearity and disorder of a plaintext image in a spatial domain and a transformation domain are enhanced, and conventional attacks can be well resisted.

Description

technical field [0001] The invention belongs to the technical field of virtual optical information encryption and decryption methods, and relates to an encryption method of an asymmetric double image based on chaos and cascaded DFrRT. decryption method. Background technique [0002] With the transmission of a large amount of digital information on the Internet, multimedia information has become an important means of information exchange for people. The widespread application of informatization brings convenience but also poses security risks. Image information has become an important carrier of information transmission because of its vivid image. Optical information processing has the advantages of large capacity, fast speed, parallelism, etc., and is widely used in digital image encryption, so information encryption has attracted widespread attention. [0003] In the mid-1990s, Refregier and Javidi proposed a dual random phase encoding technology based on the input plane a...

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Application Information

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IPC IPC(8): G06T1/00
Inventor 隋连升刘青文芦海伟刘本庆
Owner XIAN UNIV OF TECH
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