Asymmetric multi-image encryption method based on Logistic chaotic mapping

An encryption method and chaotic mapping technology, applied in the field of image processing, can solve the problems of insufficient security, small key space, low image encryption efficiency, etc., and achieve the effect of expanding the key space
CN108833736AInactive Publication Date: 2018-11-16XIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN UNIV OF TECH
Publication Date
2018-11-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an asymmetric multi-image encryption method based on Logistic chaotic mapping. The method comprises the following steps: 1) providing an encrypted plain text image fi by assuming the image amount as P and the size of each image as M*N pixels, performing interference adding on the image fi by using two symmetrically coupled same logistic mappings, thereby obtaining an interference-added image f'I; 2) retrieving POF of each interference-added image f'I by using an iteration process in the FrFT domain,, wherein the POF retrieval process is an iteration process between twogray images; 3) modulating POFs of all interferce-added images as an intermediate stage, namely, modulating all POFSs as a complex matrix G, wherein the size of the complex matrix G is same as each original image; and 4) extending the complex matrix G to the final ciphertext in a chaotic diffusion model. The method disclosed by the invention has high security under chosen-plaintext attack.
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Description

technical field

[0001] The invention belongs to the technical field of image processing, relates to image encryption based on asymmetric technology, and relates to an asymmetric multi-image encryption method based on Logistic chaotic mapping. Background technique

[0002] With the rapid popularization of computers and the Internet, image security issues have received widespread attention in various fields. Optical-based processing technology has high security for image encryption. Since Refregier and Javidi proposed an optical image encryption algorithm based on random encoding of input plane and Fourier plane, many optical encryption schemes have emerged. First, optical systems can provide many degrees of freedom, such as wavelength, focal length, and distance between lenses; second, they have inherent capabilities such as parallel processing and fast computational speed in various applications.

[0003] Although most optical schemes have excellent properties such as paral...

Claims

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