Patent•
Multi-image encryption method based on piecewise linear chaotic map (PWLCM)
30 Mar 2016-
TL;DR: In this paper, a multi-image encryption method based on piecewise linear chaotic map (PWLCM) is proposed to solve the problems that most of the conventional image encryption methods take a single image as an encryption object, and cannot adapt to mass image encryption, and the encryption efficiency is relatively low.
Abstract: A multi-image encryption method based on piecewise linear chaotic map (PWLCM) belongs to the field of information encryption, and aims to solve the problems that most of the conventional image encryption methods take a single image as an encryption object, and cannot adapt to mass image encryption, and the encryption efficiency of the conventional image encryption methods is relatively low. Being different to the conventional image encryption methods, the multi-image encryption method takes multiple images as encryption objects, and adopts the steps of converting the multiple images into a single large image, encrypting the single large image, and converting the encrypted single large image into multiple encrypted images, so as to protect contents in the multiple images. The multi-image encryption method comprises the key steps of combining k interactive images into a large image, encrypting the large image according to PWLCM to obtain an encrypted large image, dividing the encrypted large image into k encrypted images, and naming the k encrypted images sequentially according to a chaotic sequence generated based on PWLCM. Test results show that the method is easy to implement, the encryption effect is favorable, the encryption efficiency and security are high, and communication security of contents of any multiple images can be protected simultaneously.
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Patent•
02 Feb 2018
TL;DR: In this article, a multiple-image encryption method based on DNA coding and chaos is proposed, and the experimental results show that the method has excellent encryption effect and high security and is suitable for the practical application of image encryption.
Abstract: The invention discloses a multiple-image encryption method based on DNA coding and chaos, belonging to the field of information encryption. The massive digital image produced in the large data age should not only ensure the security of the image content, but also have high encryption efficiency. As a new multimedia security technology, the multiple-image encryption has the characteristic of high efficiency. A number of multiple-image encryption methods in the prior art have low encryption efficiency, weak security and obvious distortion in decrypted images, which are difficult to satisfy. Themultiple-image encryption method based on the DNA coding and the chaos comprises the following steps: encoding a number of original images into corresponding DNA sequence matrices; disordering the DNAsequence matrices by means of the chaos sequence; performing the DNA sequence diffusion operation on the disordered results; and obtaining the encrypted image by the DNA decoding operation. The maininnovation is that the invention provides a multiple-image encryption method based on the DNA coding and the chaos. The experimental results show that the method has excellent encryption effect and high security, and is suitable for the practical application of image encryption.
9 citations
Patent•
26 Apr 2017
TL;DR: The mixed primitive and chaos-based multi-image encryption (MIME) as discussed by the authors was proposed for image encryption in the field of information encryption, and it is suitable for actual image encryption applications.
Abstract: The invention discloses a mixed primitive and chaos-based multi-image encryption method and belongs to the field of information encryption. For massive digital images generated in big data era, the security of image contents and relatively high encryption efficiency need to be ensured. The multi-image encryption as a new multimedia security technology has the characteristic of high efficiency. A few multi-image encryption methods at present are low in encryption efficiency, and decrypted images are remarkably distorted and unlikely to be satisfied by people. According to the method, a plurality of original images are combined into a large image, and the large image is segmented into pure primitive sets; pure primitives are confused by utilizing a chaotic sequence and are recombined into a large confused image; and the large confused image is segmented into images with the same sizes as the original images, the images are regarded as encrypted images, and the chaotic sequence is used as a file name of the encrypted images. The main innovation contents are that the mixed primitive and chaos-based multi-image encryption method is provided. An experiment result shows that the method is very efficient and secure, and is suitable for actual image encryption applications.
3 citations
Patent•
13 Sep 2019
TL;DR: In this paper, the Fourier coefficients of the to-be-encrypted image group are generated, and part of the coefficients are selected as the ciphertext and the secret key, so that the encryption storage space is reduced, multiple images are encrypted at the same time, and the encryption efficiency is improved.
Abstract: The invention provides an image encryption method and device, and the method comprises the steps: obtaining a to-be-encrypted image group, and generating a first real number matrix of the to-be-encrypted image group; adjusting the first real number matrix to obtain a second real number matrix; performing Fourier transform on the second real number matrix to obtain a complex number matrix of the second real number matrix and a coefficient of the complex number matrix; and determining a ciphertext and a decryption key of the to-be-encrypted image group based on a preset number of coefficients ofthe complex matrix. According to the embodiment of the invention, the Fourier coefficients of the to-be-encrypted image group are generated, and part of the Fourier coefficients are selected as the ciphertext and the secret key, so that the ciphertext storage space is reduced, multiple images are encrypted at the same time, and the encryption efficiency is improved.
3 citations
Patent•
17 Apr 2020
TL;DR: Wang et al. as discussed by the authors proposed an image encryption method based on a threedimensional composite scrambling model and chaos, which belongs to the field of information encryption and aims at solving the increasingly severe problem of current network transmission security and protecting network interaction image content.
Abstract: The invention discloses an image encryption method based on a three-dimensional composite scrambling model and chaos, which belongs to the field of information encryption and aims at solving the increasingly severe problem of current network transmission security and protecting network interaction image content. In combination with bit plane decomposition, piecewise linear chaotic mapping, two-dimensional zigzag transformation and other technologies, a three-dimensional composite scrambling model is established on the basis of defining block built-in scrambling and block scrambling. Pixel scrambling is carried out on an original image by using the model, and diffusion operation is carried out on the scrambled image by using a mature hyper-chaotic system and exclusive-OR operation to obtainan encrypted image. Experiments show that the algorithm is good in encryption effect, high in security and efficient.
3 citations
Patent•
30 Oct 2018
TL;DR: In this paper, an image encryption method based on an AES (Advanced Encryption Standard) and chaos, belonging to the information security field, is described. But the method comprises the following steps: first, converting a plurality of pixels into a big integer by a sender, so as to reduce the encryption number of times; secondly, encrypting the big integers by virtue of AES and chaos; and finally, configuring an encrypted image using the encrypted big integers.
Abstract: The invention relates to an image encryption method based on an AES (Advanced Encryption Standard) and chaos, belonging to the information security field. Currently, the problem of how to protect thesafety of image contents is collectively concerned by the industrial circle and the academic circle along with the rapid development of multimedia communication techniques. The invention discloses theimage encryption method based on AES and chaos. The method comprises the following steps: firstly, converting a plurality of pixels into a big integer by a sender, so as to reduce the encryption number of times; secondly, encrypting the big integers by virtue of AES and chaos; and finally, configuring an encrypted image by virtue of the encrypted big integers. Experiments show that the method issafe and efficient and has a good encryption effect.
2 citations
References
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Patent•
10 Dec 1996TL;DR: In this article, a simple two-dimensional map is first generalized by the introduction of parameters, and the generalized map is then discretized so that it maps a rectangular matrix of points (pixels in the case of image data) in a bijective manner.
Abstract: The present invention features a method for encrypting and decrypting large amounts of data such as images. A simple two-dimensional map is first generalized by the introduction of parameters. The generalized map is then discretized so that it maps a rectangular matrix of points (pixels in the case of image data) in a bijective manner. Finally, the map is extended to three dimensions to modify the gray levels. The parameters of the map then serve as a ciphering key. The encryption consists of several iterative applications of the map to a block of a plain text message such as an image. The encryption is such that the resultant image is uncorrelated and appears as static on a TV monitor in the absence of a signal. The resultant histogram of the enciphered image becomes essentially uniform. The enciphered data is deciphered by applying an inverse map an identical number of iterations. The inventive method provides both superior speed and improved security over previously used methods of encryption.
68 citations
Patent•
09 Jul 2014
TL;DR: The chaos medical image encryption (CMIA) as mentioned in this paper was proposed for privacy protection, which includes the steps that driving is carried out through three independent logistic chaotic maps, in the scrambling stage, each pixel point in an image is exchanged with another pixel point, and the position of a target pixel point is generated by two logistic maps; key streams used in the diffusion stage are generated by the third logistic map; in the key stream generating process, each key stream element is controlled by plaintext pixels to conduct circulating shifting operation to achieve the aim of relating the key streams
Abstract: The invention relates to a chaos medical image encryption method applied to privacy protection, and belongs to the technical field of image encryption. The chaos medical image encryption method includes the steps that driving is carried out through three independent logistic chaotic maps, in the scrambling stage, each pixel point in an image is exchanged with another pixel point, and the position of a target pixel point is generated by two logistic chaotic maps; key streams used in the diffusion stage are generated by the third logistic chaotic map; in the key stream generating process, each key stream element is controlled by plaintext pixels to conduct circulating shifting operation to achieve the aim of relating the key streams and plaintexts. By means of the medical image encryption method, the scrambling effect and the scrambling speed overall performance are superior to those of an existing scrambling method, and the overall speed of an encryption system is remarkably superior to a common grouping encryption method in the modern cryptography; the cryptography analysis results show that the provided encryption method can effectively resist to various common attack techniques.
16 citations
Patent•
16 Dec 2009
TL;DR: In this article, a color image encrypting method based on a multi-chaos system is proposed, where the gray value of each pixel of an input image is recorded as a two-dimensional matrix P(x,y), S box transformation is performed to the P(h*x+y), and a transformation result is transformed into a pile of pixel groups P(H*x +y), i.e.
Abstract: The invention relates to a color image encrypting method based on a multi-chaos system, which is technically characterized in that the gray value of each pixel of an Input-image is recorded as a two-dimensional matrix P(x,y), S box transformation is performed to the P(x,y), and a transformation result is transformed into a pile of pixel groups P(h*x+y), ie P0, P1, P2, P3, to Pn, and the pixel groups are recorded as a sequence Pi; XOR operation is performed to each value of {XL1'} and {XL2'} and each pixel in Pi, ie Pi'=Pi +XL2'+XL1', thereby finishing the encrypting process The invention has the advantages of large key space, high key sensitivity, good security and strong anti-attack ability The security of the method can be completely independent of the attribute of an image and is especially suitable for the condition with higher security requirement
12 citations
Patent•
22 Apr 2015
TL;DR: The image certainty encryption double-blind secrecy matching method has wide application prospects in the fields of identity authentication, information security and the like as discussed by the authors, and has been used for conducting secrecy matching on an image with randomly disordered pixel positions by means of the characteristic that an instability measuring method can be used for measuring the stability of data streams.
Abstract: The invention discloses an image certainty encryption double-blind secrecy matching method and relates to data instability measuring and image matching technology. The image certainty encryption double-blind secrecy matching method can be used for conducting secrecy matching on an image with randomly disordered pixel positions by means of the characteristic that an instability measuring method can be used for measuring the stability of data streams. The image certainty encryption double-blind secrecy matching method has the advantages that the pixel positions of the image are disordered and encrypted, and under the situation that the random number of the positions is unknown, the image cannot be restored and image content cannot be identified; the encrypted image is difficult to decrypt; under the situation that a secret key is known, the image can be easily restored. The image certainty encryption double-blind secrecy matching method has wide application prospects in the fields of identity authentication, information security and the like.
5 citations
Patent•
22 Apr 2004
TL;DR: In this article, a wavelet conversion is conducted for image data as a first preprocess, G 1 entropy is reduced by code conversion based on distribution as a second pre-process, compression is conducted using chaos compression expansion table and a compression cipher code is generated.
Abstract: PROBLEM TO BE SOLVED: To obtain a high compression rate in compression and expansion of image data without deteriorating an image while securing a sufficient processing speed. SOLUTION: A wavelet conversion is conducted for image data as a first preprocess, G 1 entropy is reduced by code conversion based on distribution as a second preprocess, compression is conducted using chaos compression expansion table and a compression cipher code is generated. The expansion is in the inverse processes of the above processes. COPYRIGHT: (C)2004,JPO
2 citations