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Double Image Encryption Method Based on Double Encryption in Space Domain and Fourier Frequency Domain

A technology of double encryption and encryption method, applied in the field of information security, to achieve the effect of easy copying and printing, high encryption efficiency and high security

Active Publication Date: 2015-08-19
JIAXING NIYA OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the study found that this encryption method has security flaws. When two encryption keys are known, the attacker can use the iterative amplitude-phase recovery algorithm to obtain most of the plaintext information.

Method used

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  • Double Image Encryption Method Based on Double Encryption in Space Domain and Fourier Frequency Domain
  • Double Image Encryption Method Based on Double Encryption in Space Domain and Fourier Frequency Domain
  • Double Image Encryption Method Based on Double Encryption in Space Domain and Fourier Frequency Domain

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Embodiment Construction

[0044] The specific implementation of method of the present invention is as follows:

[0045] (1) The encryption process of the image (such as figure 1 shown) in the following steps:

[0046] (i) f 1 (x, y), f 2 (x, y) are two normalized original images, where (x, y) represents the coordinates of the spatial domain, and a random amplitude plate M with a uniform probability distribution on the interval [0, 1] is generated by the computer;

[0047] (ii) Using M against f 1 (x, y), f 2 (x, y) is encrypted in the airspace, and the encrypted result is a complex amplitude function C(x, y), where the amplitude part A(x, y) of C(x, y) is f 1 The encrypted result of (x, y), the phase part P(x, y) is f 2 The encryption result of (x, y), that is, A(x, y)=PT{C(x, y)}=sinθ 1 (x, y), P(x, y)=AT{C(x, y)}=exp[iθ 2 (x, y)], where PT{} represents the amplitude or phase cut operation, that is, removes the phase information of the complex amplitude, AT{} represents the phase operation, th...

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Abstract

The invention discloses a spatial domain and Fourier frequency domain double encryption-based dual image encryption method. The method comprises the following two major steps: 1, encrypting, i.e., encrypting two normalized original images in spatial domain by using a random amplitude plate generated by a computer to obtain an encrypted result, i.e., complex amplitude, and encrypting the encrypted result in frequency domain by using a random phase plate generated by the random amplitude plate; 2, decrypting, i.e., recovering the random amplitude plate and the image obtained by encryption in spatial domain by using two private keys, and decrypting in spatial domain by using the random amplitude plate to obtain a decryption result, i.e., two original images. The method is used for encrypting and decrypting images; only the random amplitude plate is used for encrypting the images in spatial domain and frequency domain during decryption, and simultaneous encryption of a plain text and encryption key information is realized; the double encryption in spatial domain and frequency domain is adopted in the image encryption method, and two private keys are generated during the encryption, so that the safety of the system is high.

Description

【Technical field】 [0001] The invention relates to the technical field of information security, in particular to an image encryption method. 【Background technique】 [0002] With the rapid development of computer technology and network technology, great changes have taken place in people's working and living styles, and a large amount of information is transmitted and exchanged in the network in the form of images every day. When the images being transferred and exchanged involve important confidentiality or personal privacy, in order to ensure the security of the information, the images must be encrypted in advance. As an effective means of digital image information protection, digital image encryption technology has been widely used. Spatial scrambling technology, pixel transformation technology and digital watermarking technology are the three main security encryption technologies for digital images. In recent years, the research on data encryption technology based on opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/32
Inventor 汪小刚陈均朗戴朝卿
Owner JIAXING NIYA OPTOELECTRONICS CO LTD
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