TWI452890B - Chaotic image encryption method for cloud album - Google Patents

Description

Image chaotic encryption method for cloud photo album

The invention relates to an image chaos encryption method for a cloud photo album, in particular to a method for a user to log in to a cloud photo album server, and to perform an encryption method for transmitting an image to a cloud photo album, by using a chaotic sequence The row and column replacement and mod operation encryption of the multi-primary color element values of the image are respectively performed to enhance the security of the cloud photo album and ensure the privacy and confidentiality of the image uploaded by the user.

According to today's Internet technology, there is a lot of space available on the Internet for professional Internet users to store their own photos or videos in the online photo album. Moreover, due to the Internet Road technology continues to advance, cloud computing concepts are widely used in commercial software, intelligent systems, network services, etc., but also some information security issues; in order to allow users to have privacy and confidentiality in various cloud services And to ensure the security of the multimedia data transmission process, the development of image encryption technology is becoming more and more important.

In general, cloud computing provides the computing power, storage, and service capabilities that users need. The final goal is to facilitate users and greatly reduce the cost of purchasing hardware and software. In addition, cloud computing focuses on three requirements: Providing convenience, the second is to improve the ability, and the third is to reduce expenses; the above three points are also the purpose of the user to use the cloud computing platform, because the cloud computing platform concentrates resources on the server side, reducing the waste and idleness of the client resources, thereby reducing the The client invests in software and hardware, and because the management and maintenance of resources and software are concentrated on the server, it also drops. Low requirements for user system maintenance, so ordinary users can enjoy high-end computing and resource services; and cloud service programs are defined as programs that provide users with cloud computing on the server. To some extent, it has surpassed the limitations of traditional applications. In addition to the basic functions of general applications, it also includes storage and computing capabilities that are not limited by location and platform. As long as users have access to the Internet, You can store your own cloud system or computing program, similar to the web application, but the computing mode is different. The operation of the web application belongs to the operation of a single server, and the cloud computing belongs to multiple servos. The operation of parallel processing.

Furthermore, image encryption is an important aspect of network or cloud transmission. When image data is transmitted from one location to another, it may be desirable to encrypt the image data so that only an authorized recipient can The view; that is, the viewer can not distinguish any meaningful information from the image without first decrypting the encrypted image; however, the current encryption method has a good encryption effect at the beginning. However, after many iterations, the characteristics of the original image gradually appear to reduce the confidentiality; therefore, how to improve the security of the image in the cloud photo album service is an important issue.

Nowadays, the inventor is in view of the fact that the existing cloud photo album encryption method still has many defects in practical implementation, so it is a tireless spirit, and with its rich professional knowledge and years of practical experience, Improvements have been made, and the present invention has been developed based on this.

The main purpose of the present invention is to provide an encryption method for a user to log in to a cloud photo album server to transmit an image to a cloud photo album, and to perform row and column replacement on the values of multiple primary color elements of the image by chaotic sequences. Mod operation encryption, to enhance the security of cloud albums, to ensure the privacy and confidentiality of the images uploaded by users.

In order to achieve the above-mentioned implementation, the inventors have developed the following implementation techniques. First, when a user logs in to the cloud photo album server and transmits an image to the cloud photo album, the image is extracted from at least one of the primary color elements of each pixel. Numerically; then, a nonlinear differential equation module is used to generate a chaotic sequence corresponding to the multi-primary element value of the image pixel; and then, each pixel of the image is replaced by a chaotic sequence; finally, it will be completed Each pixel of the row-column permutation is mod-operated with the chaotic sequence to obtain each pixel point of the encryption, and then each pixel of the encryption is converted into an encrypted image; thereby, the generated chaotic sequence is respectively for the image The primary color element gradation matrix performs row and column permutation and mod operation encryption to enhance the security of the cloud photo album to ensure the privacy and confidentiality of the images uploaded by the user.

In an embodiment of the invention, the multi-primary elements may be selected from the group consisting of color spaces such as RGB, CMYK, YUV, HSV, LAB, XYZ, HSI, and YIQ.

In an embodiment of the invention, the nonlinear differential equation module is a joint chaotic system, and the nonlinear differential equation can be solved by using a fourth-order chirp Kutta method in the numerical analysis method; wherein the joint chaotic system can be The equation is composed of: Where α [0,1] is the system parameter, and x , y , and z are the three state variables of the chaotic sequence; thereby, the state variables and system parameters of the joint chaotic system are very sensitive to time changes, and the trajectory has Unpredictable features, with better encryption, can prevent people from being easily cracked.

In addition, as described above, the image chaotic encryption method of the cloud photo album of the present invention can be applied to hardware or software, where appropriate, or a combination thereof, and thus some aspects or portions thereof may be embedded in practice. A code (ie, a command) in the media, such as a floppy disk, a CD player, a hard disk drive, or any other machine readable storage medium, wherein when the code is loaded and executed by a machine (eg, a computer), The machine will become a device for performing the present invention, and in the case where the code is executed in a programmable computer, the computer device usually includes a processor, a processor-readable storage medium (including volatile or non-volatile A memory and/or storage element), at least one input device, and at least one output device.

The object of the present invention and its structural design and advantages will be explained in the light of the preferred embodiments shown in the following drawings, so that the reviewing committee can have a more in-depth and specific understanding of the present invention.

First, referring to the first figure, which is a flow chart of a preferred embodiment of the image chaotic encryption method of the cloud photo album of the present invention, the image chaotic encryption method of the cloud photo album of the present invention is applied to the user to log in to the cloud. The server server performs the process of transmitting the image to the cloud photo album, and includes the following steps: Step 1 (S1): extracting a value of at least one of the plurality of primary color elements of each pixel of the image; wherein, the multi-primary color element is selected from Groups of color spaces such as RGB, CMYK, YUV, HSV, LAB, XYZ, HSI, and YIQ; for convenience of description, in the present embodiment, the multi-primary elements are red (Red, R), green (Green, G) and blue (B, B) color elements are taken as an example. After reading and understanding the teachings of the present invention, those skilled in the art will know that the multi-primary elements of the present invention may also be CMYK, YUV, HSV, LAB. One of the color spaces, XYZ, HSI, and YIQ, without affecting the implementation of the present invention; Step 2 (S2): generating a multi-primary element value of a corresponding image pixel by a nonlinear differential equation module Chaotic sequence; in this embodiment, nonlinear The differential equation module is a Unified Chaotic System, and the joint chaotic system consists of the following equations: Where α [0,1] is a system parameter, and x , y , and z are three state variables of a chaotic sequence; and the above-mentioned nonlinear differential equation can utilize the fourth-order chirp method in the numerical analysis method (Runge-Kutta 4th Order) Method) to solve; Step 3 (S3): replace each pixel of the image with a chaotic sequence; Step 4 (S4): Perform mod operation on each pixel of the row-column replacement and the chaotic sequence to obtain Each pixel of the encryption; and step five (S5): converting each pixel of the encryption into an encrypted image.

According to the image chaos encryption method of the cloud album described above, the implementation is implemented in a Google App Engine (GAE) cloud computing environment, and uses Java to implement a joint chaotic system-based image encryption technology; GAE is a new service released by Google in 2008. It is based on the concept of cloud computing to help developers build reliable web applications. This service provides a complete software development kit, network and server. Such devices, so developers do not need to consider issues such as network, server management and maintenance, and hardware expansion, as long as the tasks that are to be processed are handed over to the cloud, the final result will be generated from the cloud; When the user logs in to the GAE cloud photo album server and transmits the image to the cloud photo album, it is assumed that the length and width of the image are M and N respectively, that is, the image is from the horizontal N grid points and the vertical direction. M grid points consist of M × N pixels, and a large number of image statistical analysis confirmed that there are close relationships between adjacent pixels in the image, with an average of 8 to 16 horizontal, vertical and Direction between the pixels have high relevance; relevance for this disorder, in order to prevent theft by cracks, x chaotic sequence generated by the chaotic systems combined, y, z, individual images of the R, G, The B-level value is used to chaotic scrambling of the row and column position to improve the security of the encrypted image; wherein, the system parameter α =0, and x , y , and z are 1, 2, and 1 , respectively, as the initial value setting, when the image is performed In the third row (S3), the row and column are replaced by the following double loop: for i=1 to M for j=1 to N... row and column replacement Next j Next i; and each pixel point of the row and column replacement is completed. Perform the mod operation of step four (S4) with the chaotic sequence as follows: for i=1 to M for j=1 to N...mod operation Next j Next i; finally, convert each pixel point that completes encryption into an encrypted picture Therefore, due to the high sensitivity of the joint chaotic system and the unpredictable characteristics of the chaotic trajectory, the chaotic sequences generated are used to perform row-column replacement and mod operation encryption on the R, G, and B gradation matrices of the image, respectively. Excellent encryption and protection against thieves To enhance the privacy of the cloud photo album; it is worth noting that when the image of the cloud photo album is encrypted, the client holding the correct decryption key can browse the encrypted image of the cloud photo album server without holding Users who decrypt the key correctly will not be able to view the image of the server.

In addition, as described above, the image chaos encryption method of the cloud photo album of the present invention may be applied to hardware or software, where appropriate, or a combination thereof, and thus some aspects or portions thereof may be embedded in the method of the present invention. A code (ie, a command) in actual media, such as a floppy disk, a CD player, a hard disk drive, or any other machine readable storage medium, wherein when the code is loaded and executed by a machine (eg, a computer), The device may become a device for performing the present invention, and in the case where the code is executed in a programmable computer, the computer device usually includes a processor and a processor-readable storage medium (including volatile or non-volatile Volatile memory and/or storage element), at least one input device, and at least one output device.

It can be seen from the image chaotic encryption method and the implementation description of the cloud album described above that the present invention has the following advantages:

1. In the Google App Engine cloud computing environment, the image encryption technology based on the joint chaotic system is implemented in Java, and the chaotic sequence generated by the image is used to replace the R, G, B color matrix of the image. And mod operation encryption, strengthen the security of cloud albums, and ensure the privacy and confidentiality of images uploaded by users.

2. The image chaotic encryption method of the cloud photo album of the invention is very sensitive to temporal changes by the state variables and system parameters of the joint chaotic system, and the trajectory has unpredictable characteristics, and has better encryption effect, which can prevent The heart is easily cracked.

In summary, the image chaos encryption method of the cloud photo album of the present invention can achieve the expected use efficiency by the above disclosed embodiments, and the present invention has not been disclosed before the application, and has completely met the requirements. The provisions and requirements of the Patent Law.爰Issuing an application for a patent for invention in accordance with the law, and asking for a review, and granting a patent, is truly sensible.

The illustrations and descriptions of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; those skilled in the art, which are characterized by the scope of the present invention, Equivalent variations or modifications are considered to be within the scope of the design of the invention.

(S1)‧‧‧Step one

(S2)‧‧‧Step 2

(S3) ‧ ‧ Step 3

(S4)‧‧‧Step four

(S5) ‧ ‧ step five

First Figure: Flowchart of the steps of a preferred embodiment of the present invention

(S1)‧‧‧Step one

(S2)‧‧‧Step 2

(S3) ‧ ‧ Step 3

(S4)‧‧‧Step four

(S5) ‧ ‧ step five

Claims (7)

An image chaos encryption method for cloud photo albums, when the user logs in to the cloud photo album server, the following steps are included when transmitting the image to the cloud photo album: Step 1: extracting at least one pixel per pixel of the image The value of the primary color element; Step 2: generating a pair of chaotic sequences of the values of the plurality of primary color elements of the image pixel by a nonlinear differential equation module; Step 3: using each chaotic sequence of the image as the chaotic sequence Performing row and column replacement; step 4: performing mod operation on each pixel of the row and column replacement with the chaotic sequence to obtain each pixel point of encryption; and step 5: converting each pixel of the encryption into an encrypted image. For example, the image chaotic encryption method of the cloud photo album described in the first application of the patent scope, wherein the nonlinear differential equation module is solved by a numerical analysis method. For example, the image chaos encryption method of the cloud photo album described in claim 2, wherein the numerical analysis method is a Runge-Kutta 4th Order Method. The image chaos encryption method of the cloud photo album according to any one of claims 1 to 3, wherein the nonlinear differential equation module is a Unified Chaotic System. For example, the image chaos encryption method of the cloud photo album described in claim 4, wherein the joint chaotic system is composed of the following equations: ; among them, α [0,1] is a system parameter, and x , y , and z are the three state variables of the chaotic sequence. The image chaos encryption method of the cloud photo album according to claim 1, wherein the multi-primary color element is selected from the group consisting of RGB, CMYK, YUV, HSV, LAB, XYZ, HSI, and YIQ color space. . A computer readable medium having computer executable instructions for performing the method of any one of claims 1 to 6 when the computer executes the computer executable instructions.