Dynamic random secret key encryption and decryption method of digital image

A dynamic random and key encryption technology, which is applied in the fields of information security and image processing, can solve problems such as complexity, high key security, lack of key encryption principles, etc., and achieve high security effects

Inactive Publication Date: 2015-05-06
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The analysis shows that in the existing public literature, in the research on the encryption method of optical digital images, there is still a lack of image encryption and decryption methods with complex key encryption principles and high key security.

Method used

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  • Dynamic random secret key encryption and decryption method of digital image
  • Dynamic random secret key encryption and decryption method of digital image
  • Dynamic random secret key encryption and decryption method of digital image

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with embodiment.

[0033] A dynamic random key encryption and decryption method for a digital image is characterized in that it comprises the following steps,

[0034] Encryption steps:

[0035] (1) Generate and encrypt the image 100 f ( x , y , n ) of the same size are uniformly distributed in the interval (- p, p ] of random phase matrix f ( x , y ,0), n =1,2,3,..., n is the serial number of the transmitted image, the same below;

[0036] (2) with matrix f ( x , y ,0) is the source matrix, generating two dynamic random phase masks based on the 4f system. These two masks change dynamically with the transmission image, and their random phases are generated according to the following formula

[0037]

[0038] in, G ( x , y , k ) is a Gaussian distribution random matrix with mean 0 and standard deviation 1, It is a normal distribution matrix, where s=D l x n , n =1,2,3,.....

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Abstract

Disclosed is a dynamic random secret key encryption and decryption method of a digital image. The dynamic random secret key encryption and decryption method of the digital image designs a dynamic secret key based on optical vortexes on the basis of a typical double random phase encryption 4f system, and can achieve high security information encryption and decryption transmission of a dynamic image stream.

Description

technical field [0001] The invention relates to a digital image encryption and decryption method, belonging to the fields of information security and image processing. Background technique [0002] Cryptographic technology based on optical theory and methods is a new generation of cryptographic theory and technology that has started to develop internationally in recent years. Compared with traditional mathematics-based computer cryptography, optical cryptography has many advantages such as multi-dimensionality, large amount of information, multiple degrees of freedom, and inherent parallel data processing capabilities. [0003] In terms of using optical methods to encrypt and decrypt data, in 1995 P. Refregier and B. Javidi first proposed an optical method for data encryption through double random phase encoding in a standard 4f optical signal processor. The basic principle of this method is: place an uncorrelated random phase mask on the input plane and the Fourier spectru...

Claims

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Application Information

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IPC IPC(8): H04N1/32H04N1/44
CPCH04N1/3216H04N1/32272
Inventor李新忠台玉萍康大伟甄志强张利平尹更新
OwnerHENAN UNIV OF SCI & TECH