TW201640391A - A discrete chaotic synchronization of real-time imaging system and its chaotic synchronization signal method - Google Patents

Abstract

A discrete chaotic synchronization of real-time imaging system adapted to receive a digital image information, and includes an image encryption module, and an image decryption module. The image encryption module includes a encrypted calculator, an encryption signal generator, and a encryption dynamic private key generator. The image decryption module includes a decryption calculator, a decryption signal generator, and a decrypt dynamic private key generator. Wherein the image encryption module and the image were a decryption module embedded devices, by digital information transmission and video signal encryption and decryption calculation.

Description

Discrete chaotic synchronization real-time image system and its chaos Signal synchronization method

The invention relates to an instant image system and method, in particular to a discretization chaotic synchronization real-time image system and a chaotic signal synchronization method thereof.

In the past, chaotic systems are analogous chaotic systems, all of which use general electronic circuits, using resistors, capacitors, inductors, and operational amplifiers. However, the biggest disadvantage of using analog systems is the aging of the components themselves. The temperature stability and other factors change the stability of the circuit, and due to the butterfly effect characteristics of the chaotic system itself, it seriously affects the stability of the system, which leads to the possibility of synchronous control failure.

For example, China Patent No. M339162 "A chaotic encryption device based on mobile medical treatment" is a first-order chaotic encryptor with fast encryption speed but low encryption strength and second-order chaos with slow encryption speed but high encryption strength. The cryptographic action medical medical chaos encryption device.

The encryption mechanism of the prior art mainly encrypts the biomedical medical signal values such as the electrocardiogram/brain wave map, and achieves the visually invisible encryption function, encrypts the signal bit stream of the plurality of mobile medical transmission media, and introduces chaotic encryption of different degrees. The concept of a device, in which a voice signal with a large amount of data is fast, a first-order chaotic encryption with a fast encryption speed but a low encryption strength is used, and an image signal and a heart with high security requirements are used. Electrographic signals, brain wave signals, medical texts such as medical records, body temperature, pulse measurement values, etc., and second-order chaotic encryption with slow encryption speed but high encryption strength.

However, the early chaotic imaging system still has the following disadvantages in its use:

First, the parts are aging

Early chaotic systems use analog-like chaotic systems, which are implemented on circuit boards that utilize general electronic circuits. When the electronic components age after a period of time, the initial values change to produce a butterfly effect, which affects system stability. Synchronous control is invalid.

Second, unable to perform more complicated calculations

The image encryption and decryption calculation of the early chaotic system uses a continuous system. The more complicated the key is encrypted, the more electronic components must be used, the system cost increases, and the complex chaotic system is more prone to errors during decryption, making the traditional image The chaotic system has a chance to be cracked.

Therefore, how to improve the early use of analog signals, and realize the electronic components (resistors, capacitors, inductors, and operational amplifiers), the appearance of parts aging, and the error does not expand and the failure to successfully decrypt the image, it becomes a related technician The goal of hard work is urgent.

In view of the above, an object of the present invention is to provide a discretization chaotic synchronization real-time image system, which is suitable for receiving an image digital information, and includes an image encryption module and an image decryption module.

The image encryption module includes an encryption calculator that receives the digital information of the image, an encrypted terminal signal generator that generates a digital chaotic signal, and an encrypted dynamic private key that receives the digital chaotic signal and generates an encrypted dynamic private key. The encryption calculator receives the encrypted dynamic private key And calculate an image encryption signal. The image decryption module includes a decryption calculator that receives the image encrypted signal, a decryption signal generator that receives the digital chaotic signal and generates a synchronous chaotic signal, and receives the synchronous chaotic signal and generates a decrypted dynamic private The decryption dynamic private key generator of the key receives the decrypted dynamic private key and calculates a decoded image information that is the same as the image digital information. The image encryption module and the image decryption module are respectively an embedded device, and the information transmission and the image encryption and decryption signal are calculated by digitization.

A further technical means of the present invention is that the digital chaotic signal generated by the encrypted signal generator is a discretized digital signal, and the synchronous chaotic signal generated by the decrypted signal generator is also a discretized digital signal.

Another technical means of the present invention is that the decryption signal generator has a synchronization control unit that synchronizes the synchronization chaotic signal with the digital chaotic signal to enable the decryption calculator to calculate the correct decoded image. News.

Another object of the present invention is to provide a chaotic signal synchronization method for a real-time image system with discretization chaotic synchronization described above, which comprises the following steps:

First, step (a) is performed to define a dynamic equation of the discretized chaotic signal. Then, in step (b), the state variables of the encrypted end signal generator and the decryption end signal generator are respectively brought into the dynamic equation, and an encrypted chaotic equation and a decrypted chaotic equation are obtained. Then, step (c) is performed to define an error state, and the chaotic equation of the encryption end is subtracted from the chaotic equation of the decryption end to obtain a differential dynamic equation. Next, step (d) is performed to define a conversion plane, and the differential dynamic equation is converged to 0 by the sliding mode to stabilize the state error response. Finally, in step (e), the synchronization control unit detects the digital chaotic signal and enters a sliding mode to synchronize the synchronous chaotic signal with the digital chaotic signal.

According to still another technical means of the present invention, in the step (a), the dynamic equation of the scattered chaotic signal is: x _d (k+1)T=x _d (KT)+Hg(x _d (KT) )); y _d (KT) = Cx _d (KT).

Another technical means of the present invention is that in the above step (c), the error state is e(k) = x _s (k) - x _m (k).

Another technical means of the present invention is that in the above step (d), the conversion surface is s(k)=e _s (k)+ce ₁ (k), and the differential dynamic equation is converged by the sliding mode to The equation of 0 is as follows:

A further technical means of the present invention is that in the above step (e), the synchronous control unit is of the following equation: u(k) = -f ₁ (e(k)) - αs(k).

Another technical means of the present invention is that the chaotic signal synchronization method further includes a step (f), the encrypted dynamic private key generator receives the digital chaotic signal of the encrypted end signal generator, and the decrypted dynamic private key generator Receiving the synchronization chaotic signal of the decryption end signal generator to synchronize the encrypted dynamic private key with the decrypted dynamic private key.

Another technical means of the present invention is that the chaotic signal synchronization method further includes a step (g) of encrypting the image digital information into the image encryption signal by using the encrypted dynamic private key, the decryption calculator The image encrypted signal is decrypted into decoded image information by using a decrypted dynamic private key.

The beneficial effect of the invention is that the chaotic image system of the traditional electronic component is changed into an embedded device which is calculated by software control, and the algorithm is rewritten to discretize the chaotic signal, and the chaotic real-time image encryption and decryption system is discretized. Convenient to any chaotic system, and because of the special properties of singular attractors in chaotic systems, even with the same chaotic system, initial values, synchronous controller design methods, and encryption algorithms Different, and generate different encryption and decryption signals, deepen the complexity of signal decryption, so the system can increase the stability and security of image encryption and decryption.

2‧‧‧Image Digital Information

3‧‧‧Image Encryption Module

31‧‧‧Encryption Calculator

311‧‧‧Image encryption signal

32‧‧‧Encrypted signal generator

321‧‧‧Digital chaotic signals

33‧‧‧Encrypted Dynamic Private Key Generator

331‧‧‧Encrypted dynamic private key

4‧‧‧Image Decryption Module

41‧‧‧Decryption Calculator

411‧‧‧Decoding image information

42‧‧‧Decryption signal generator

421‧‧‧Synchronized chaotic signals

422‧‧‧Synchronous control unit

43‧‧‧Decrypted Dynamic Private Key Generator

431‧‧‧Decrypted dynamic private key

801~807‧‧‧Steps

1 is a schematic diagram of a device, illustrating a first preferred embodiment of a discretization chaotic synchronization real-time image system and a chaotic signal synchronization method thereof; FIG. 2 is a flow chart illustrating a method for discretizing chaotic synchronization of the present invention. A second preferred embodiment of the image system and its chaotic signal synchronization method; FIG. 3 is a response diagram illustrating the second preferred embodiment using a computer software to simulate the Lorentz response of the second preferred embodiment FIG. 4 is a response diagram illustrating a response diagram of the second preferred embodiment implemented in Lorentz of the embedded device; FIG. 5 is a computer simulation diagram illustrating that the second preferred embodiment is implemented in Figure 6 is a computer simulation diagram illustrating the response of the second preferred embodiment to an error state of the embedded device; and Figure 7 is a computer simulation diagram A response diagram of the synchronization control unit implemented in one of the embedded devices is illustrated in the second preferred embodiment.

The details of the related patents and the technical contents of the present invention will be apparent from the following detailed description of the preferred embodiments of the accompanying drawings.

It should be noted that, before the detailed description, similar elements are denoted by the same reference numerals.

1 is a first preferred embodiment of a discretization chaotic synchronization real-time image system and a chaotic signal synchronization method thereof. The first preferred embodiment is a discretization chaotic synchronization real-time image system, which is applicable to Receiving an image digital information 2, and comprising an image encryption module 3 and an image decryption module 4.

The image encryption module 3 includes an encryption calculator 31 that receives the image digital information 2, an encrypted terminal signal generator 32 that generates a digital chaotic signal 321 , and receives the digital chaotic signal 321 and generates an encrypted dynamic private key. The encrypted dynamic private key generator 33 of 331 receives the encrypted dynamic private key 331 and calculates an image encrypted signal 311.

The image decryption module 4 includes a decryption calculator 41 that receives the image encryption signal 311, a decryption signal generator 42 that receives the digital chaotic signal 321 and generates a synchronization chaotic signal 421, and receives the synchronization chaotic signal 421. And a decryption dynamic private key generator 43 for decrypting the dynamic private key 431 is generated. The decryption calculator 41 receives the decrypted dynamic private key 431 and calculates a decoded image information 411 which is the same as the image digital information 2.

The image encryption module 3 and the image decryption module 4 are respectively an embedded device, and the information transmission and the image encryption and decryption signal are calculated by digitization. The embedded device is a computer system with digital computing capabilities, usually requiring digital calculations, and is the primary device included in controlling hardware or mechanical components. Many of the systems that are common today are controlled by embedded devices, which are as complex as a single chip, with multiple components, peripherals, and networks installed in a large chassis or enclosure. For example: Soekris net4801 embedding The device is suitable for web applications. The embedded device has a wide variety and is widely used in commercially available products, and its technical field can be obtained and utilized by ordinary people. Since the hardware technology of the embedded device itself is not the focus of the case, here I will not repeat them in detail.

The present inventors have emphasized that although the present invention uses an embedded device (UDOO) that generally has image transmission and reception and transmission and reception, a new encryption algorithm is rewritten for the internal execution program to make the encryption message. The digital chaotic signal 321 generated by the number generator 32 is a discretized digital signal, and the synchronous chaotic signal 421 generated by the decryption signal generator 42 is also a discrete digital signal.

The decryption terminal signal generator 42 has a synchronization control unit 422 for synchronizing the synchronization chaotic signal 421 with the signal of the digital chaotic signal 321 for enabling the decryption calculator 41 to calculate the correct decoded image information 411.

The encrypted dynamic private key generator 33 of the image digital information 3 receives the dynamic digital chaotic signal 321 generated by the encrypted terminal signal generator 32, and generates the encrypted dynamic private key 331, since the encrypted terminal signal generator 32 is used. The discretized digital signal is calculated, so the encrypted dynamic private key 331 has different information with time. When the image digital information 3 receives the image digital information 2, the encrypted calculator 31 will digitize the image. The information 2 is logically operated with the encrypted dynamic private key 331 to obtain the image encrypted signal 311.

Because the image encryption signal 311 is directly encrypted during playback, the normal image cannot be played. In this case, the image encryption signal 311 and the digital chaotic signal 321 can be transmitted. The information transmission method can use wireless technology or can be used. Wired transmission technology, because the technology of information transmission is not the focus of the present invention, will not be described here.

It is worthwhile to note that the digital chaotic signal 321 is a discretized digital signal, and the characteristics of the chaotic (Chaos) singular attractor make the chaotic system pay great attention to the initial conditions, even if the same chaotic decryption device is used. Due to the initial value, the algorithms for encrypting and decrypting in the writing program are different, and there are different results, so even if the information is transmitted by a third party during the information transmission, it cannot be successfully decrypted.

The decryption signal generator 42 of the image decryption module 4 receives the digital chaotic signal 321 , and the synchronization control unit 422 generates a synchronization chaotic signal 421 synchronized with the image encryption signal 311 , and the decrypted dynamic private key generator is enabled. 43 produces the correct decryption dynamic private key 431, when When the decryption calculator 41 receives the image encryption signal 311, the image encryption signal 311 and the decryption dynamic private key 431 are logically operated to restore the image digital information 2 and obtain decoded image information 411.

When the decryption calculator 41 of the image decryption module 4 generates the correct decoded image information 411, the decoded image information 411 can be connected to any video player to dial the correct image information, and the present invention is For the encryption and decryption of the digital image map, the processing speed of the embedded device only needs to reach more than 16 images per second, so as to achieve smooth image, and since the embedded device is composed of integrated circuits, The user can choose to execute an embedded device with a faster calculation speed, which can improve the resolution of the image and improve the smoothness of the image playback.

2 is a second preferred embodiment of a discretization chaotic synchronization real-time image system and a chaotic signal synchronization method thereof. The second preferred embodiment is a chaotic method using the discretization chaotic synchronization real-time image system. The signal synchronization method includes steps 801-807.

First, step 801 is performed to define a dynamic equation of the discretized chaotic signal. The dynamic equation of chaotic continuous type is as follows (1):

Where g(x(t)) is a nonlinear vector and (A, B) is controllable. The discrete-time chaotic system can be obtained according to the above formula (1) and can be expressed as follows: (2): x _d (k+1)T=x _d (KT)+Hg(x _d (KT)) y _d (KT)= Cx _d (KT) (2)

Where G=e ^AT ; H=[GI _n ]A ^-1 B.

The inventors exemplify the Lorenz system, in which the continuous system is described as (3):

Where a=10, b=8/3, c=28, in order to simplify the design, the above equation (3) is rewritten to satisfy the matrix of (1) as follows: (4):

If the sampling time is 0.001 seconds, the discrete system obtained by (2) can be obtained as follows: (5):

Referring to Figure 3, the inventors used MATLAB to simulate the state response of the singular attractor under the Lorenz model system. Among them, it is also implemented in many chaotic systems. The X and Y axes in the graph are respectively The relationship between X _d1 , X _d2 , and X _d3 in the discretized digital signal is represented by three graphs.

Referring to FIG. 4, the state response diagram of the improved discrete chaotic system written by the inventor and written into the embedded device (UDOO) is similar. The X and Y axes in the figure are respectively the discrete digital signals. The correlations between X _d1 , X _d2 , and X _d3 are represented by three graphs, respectively. Comparing Figure 3 with Figure 4, the response graphs of the two are not far from each other, indicating that the chaotic calculation method is changed to a discretized digital signal, and it is feasible to implement on an embedded device.

Next, in step 802, the state variables of the encrypted end signal generator 32 and the decryption end signal generator 42 are respectively brought into the dynamic equation, and an encrypted chaotic equation (6) and a decrypted chaotic equation (7) are obtained. ).

The chaotic equation of the encryption end is as follows (6): x _{md 1} ( k +1)=0.99 x _{md 1} ( k )+0.01 x _{md 2} ( k ) x _{md 2} ( k +1)=0.028 x _{md 1} ( k )+0.999 x _{md 2} ( k )-0.001 x _{md 1} ( k ) x _{md 3} ( k ) x _{md 3} ( k +1)=0.997 x _{md 3} ( t )+0.001 x _{md 1} ( k ) x _{md 2} ( k ) (6)

The chaotic equation of the decryption end is as follows (7): x _{sd 1} ( k +1)=0.99 x _{sd 1} ( k )+0.01 x _{sd 2} ( k ) x _{sd 2} ( k +1)=0.028 x _{sd 1} ( k )+0.999 x _{sd 2} ( k )+ u ( k ) x _{sd 3} ( k +1)=0.997 x _{sd 3} ( t )+0.001 x _{sd 1} ( k ) x _{md 2} ( k ) (7)

Where x _m =[x _md1 , x _md2 , x _md3 ] and x _s =[x _sd1 , x _sd2 , x _sd3 ] are the state variables of the main servant system, respectively.

Then, in step 803, an error state (8) is defined, and the chaotic equation of the encryption end is subtracted from the chaotic equation of the decryption end to obtain a differential dynamic equation (9), wherein the error state is as follows: (8): e ( k) )= x _s ( k )- x _m ( k ) (8)

From (6)-(8), we can derive the differential dynamic equation of the following error system: e ₁ ( k +1)=0.99 e ₁ ( k )+0.01 e ₂ ( k ) e ₂ ( k +1) =0.028 e ₁ ( k )+0.999 e ₂ ( k )+0.001 x _{md 1} ( k ) x _{md 2} ( k )+ u ( k ) e ₃ ( k +1)=0.997 e ₃ ( t )+0.001 x _{Md 2} ( k ) e ₁ ( k ) (9)

It is clear that the problem of discretization chaotic synchronization is to discuss how to stabilize the differential dynamic equation (9) and design an appropriate synchronization control unit 422u(k) to make the encryption end chaotic equation (7) and the decryption end. The state error response between the chaotic equations (8) is stable, which is the following equation (10):

Where e(k)=[e ₁ (k)e ₂ (k)e ₃ (k)] ^T .

Next, in step 804, a conversion plane (11) is defined, and the differential dynamic equation (9) is converged to 0 by using a sliding mode to stabilize the state error response. The conversion plane is as follows: (11): s ( k )= e ₂ ( k )+ ce ₁ ( k ) (11)

Where s R, and c is the parameter of choice satisfying |0.99-0.01c|<1. When the system enters the sliding mode s(k)=e ₂ (k)-ce ₁ (k)=0, the error system (9a) dynamically satisfies the following equation (12): e ₁ ( k +1)=(0.99- 0.01 c ) e ₁ ( k ) (12)

The sliding mode used in the second preferred embodiment is a control method, which mainly generates two or more subsystems in a controlled system, and then uses some deliberately added switching conditions to generate a sliding mode for achieving The target is controlled in a stable and ideal state, and since the control technique of the sliding mode is already very mature and well known to those of ordinary skill in the art, it will not be described in detail herein.

Then, in step 805, the synchronization control unit 422 detects the digital chaotic signal 321 and enters a sliding mode to synchronize the synchronous chaotic signal 421 with the digital chaotic signal 321.

Since c satisfies |0.99-0.01c|<1, e ₁ (k) will converge to 0, and the system s(k)=e ₂ (k)+ce ₁ (k)=0 in the sliding mode, so e ₂ (k) will also converge to 0. When both e ₁ (k) and e ₂ (k) converge to 0, the equation (9) is degenerated to e ₃ (k+1)=0.997e ₃ (t), That is, e ₃ (t) will converge to 0 to converge the differential dynamic equation (9) to zero. And the synchronization control unit 422 is designed as follows (13): u(k)=-f ₁ (e(k))-αs(k) (13)

Where f ₁ (e(k))=(0.028-0.01c)e ₁ (k)+(0.01c-0.001)e ₂ (k)+0.001x _md1 (k)x _md3 (k) (14)

In the simulation test, the inventor set the value to x _m (0)=[1-1-1] ^T , x _s (0)=[-0.50.6-0.5] ^T , and select c=49 to satisfy |0.99-0.01c|<1, so the conversion surface s(k) can be designed as follows: s ( k )= e ₂ ( k )+49 e ₁ ( k ) (15)

At the same time, the synchronization control unit 422 is designed as follows: u ( k )=- f ₁ ( e ( k ))- αs ( k ); where α = 0.2 (16)

Referring to Figures 5, 6, and 7, the results of the inventor simulation test, wherein Figure 5 is a response diagram of the conversion surface s(k), the X-axis is time (t), and the Y-axis is the conversion surface s(k) Figure 6 is a response diagram of the error state e(k), the X-axis is time (t), the Y-axis is the error state e(k): e ₁ , e ₂ , and e ₃ ; Figure 7 is the synchronous control unit The response graph of 422u(k), the X axis is time (t), and the Y axis is the synchronization control unit 422u(k); the encrypted end signal generator 32 and the decryption end signal generator 42 are clearly indicated in the drawing. As expected, the error converges to zero to synchronize the digital chaotic signal 321 with the synchronous chaotic signal 421.

Next, in step 806, the encrypted dynamic private key generator 33 receives the digital chaotic signal 321 of the encrypted end signal generator 32, and the decrypted dynamic private key generator 43 receives the synchronous chaotic signal 421 of the decrypted end signal generator 42 to The encrypted dynamic private key 331 generated by the encrypted dynamic private key generator 33 is synchronized with the decrypted dynamic private key 431 generated by the decrypted dynamic private key generator 43.

The encrypted dynamic private key generator 33 must convert the digital chaotic signal 321 into an encrypted dynamic private key 331 of an image matrix of the same size as the image digital information 2. The decrypted dynamic private key generator 43 must synchronize the synchronization. The signal 421 is converted into a decrypted dynamic private key 431 of an image matrix of the same size as the image encryption signal 311 to facilitate subsequent steps.

Finally, in step 807, the encryption calculator 31 encrypts the image digital information 2 into the image encryption signal 311 by using the encrypted dynamic private key 331. The decryption calculator 41 uses the decrypted dynamic private key 431 to synchronize the image encryption signal 311. Decrypted into decoded image information 411.

The image digital information 2 is a plurality of digital image images. When the encryption calculator 31 receives the image digital information 2, The image digital information 2 is logically operated with the encrypted dynamic private key 331 to obtain the image encrypted signal 311 and transmitted. The encrypted dynamic private key 331 is changed according to the digital chaotic signal 321 at any time, so that the image is encrypted. 311 has the effect of confidentiality.

When the decryption calculator 41 receives the image encryption signal 311, the image encryption signal 311 and the decryption dynamic private key 431 are logically operated. Since the step 806 has the decrypted dynamic private key 431 and the encrypted dynamic private The key 331 is synchronized, so the decrypted dynamic private key 431 can correctly restore the image encrypted signal 311 to the decoded image information 411, and store the decoded image information 411 in the display capable of displaying the image.

Finally, the inventor would like to emphasize that since the embedded device is a semiconductor wafer using an executable program, the products of the current integrated circuit are more and more advanced, and the calculation performance is more and more powerful, and the digital calculation of the present invention can be performed. Immediately after calculation, the designer can also select a more complex encryption equation and convert it into discrete digital information for execution in the embedded device. Of course, a relatively confidential image encryption signal 311 can be obtained, which is not afraid of leakage of image data.

It can be seen from the above description that the discretization chaotic synchronization real-time image system and the chaotic signal synchronization method of the present invention do include the following advantages:

First, extend the life of the device

The invention converts the continuous chaotic signal into a digitized discretized digital signal, and realizes in the embedded device, and improves the error value, component aging, temperature and humidity, etc. of the electronic component itself in the conventional electronic circuit. An error occurs and image encryption and decryption cannot be performed correctly.

Second, more confidential

Due to the faster execution speed of the integrated circuit, the computing function of the embedded device is very powerful. A very complicated calculation can be performed in a short time, and the more complicated encrypted dynamic private key 331 can be used in the design, so that the third party to the image encryption signal 311 is less likely to decode, and the effect of confidentiality is deepened.

Third, make the picture smoother

Since the image digital information 2 is composed of a plurality of digital image images, the faster the execution speed of the embedded device, the more images can be processed per second, which not only makes the displayed image smoother, but also It can improve the resolution of the image and make the image clearer.

In summary, the present invention performs a novel implementation method similar to the chaotic image encryption and decryption control system conventionally used in electronic circuits. First, the analog chaotic signal is discretized, and the discretized digital signal is obtained, which is in the embedded device. The implementation can not only improve the service life of the traditional electronic circuit and the error condition between the electronic components, but also improve the calculation speed to make the decoded image information 411 more smooth and clear, so that the invention can be achieved. The purpose.

However, the above is only the two preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change of the patent application scope and the description of the invention is Modifications are still within the scope of the invention.

2‧‧‧Image Digital Information

3‧‧‧Image Encryption Module

31‧‧‧Encryption Calculator

311‧‧‧Image encryption signal

32‧‧‧Encrypted signal generator

321‧‧‧Digital chaotic signals

33‧‧‧Encrypted Dynamic Private Key Generator

331‧‧‧Encrypted dynamic private key

4‧‧‧Image Decryption Module

41‧‧‧Decryption Calculator

411‧‧‧Decoding image information

42‧‧‧Decryption signal generator

421‧‧‧Synchronized chaotic signals

422‧‧‧Synchronous control unit

43‧‧‧Decrypted Dynamic Private Key Generator

431‧‧‧Decrypted dynamic private key

Claims (10)

A discretization chaotic synchronization real-time image system, which is adapted to receive an image digital information, and includes: an image encryption module, comprising an encryption calculator that receives the digital information of the image, and an encrypted terminal signal that generates a digital chaotic signal And an encrypted dynamic private key generator for receiving the digital chaotic signal and generating an encrypted dynamic private key, the encryption calculator receiving the encrypted dynamic private key and calculating an image encrypted signal; and an image decryption module, including a decryption calculator that receives the image encryption signal, a decryption signal generator that receives the digital chaotic signal and generates a synchronous chaotic signal, and a decryption dynamic private key that receives the synchronous chaotic signal and generates a decrypted dynamic private key The decryption calculator receives the decrypted dynamic private key and calculates a decoded image information that is the same as the image digital information; wherein the image encryption module and the image decryption module are respectively an embedded device, and are digitally The transmission of information and the calculation of image encryption and decryption signals are carried out. According to the instant image system of the discretization chaotic synchronization described in claim 1, wherein the digital chaotic signal generated by the encrypted signal generator is a discretized digital signal, and the synchronization chaos generated by the decryption signal generator The signal is also a discrete digital signal. An instant image system for discretizing chaotic synchronization according to claim 2, wherein the decryption signal generator has a synchronization control list The element synchronizes the synchronization chaotic signal with the signal of the digital chaotic signal to enable the decryption calculator to calculate the correct decoded image information. A chaotic signal synchronization method for discretizing chaotic synchronization real-time image system according to any one of claims 1 to 3, and comprising the following steps: (a) defining a dynamic equation of a discretized chaotic signal; (b) The state variables of the encrypted end signal generator and the decryption end signal generator are respectively brought into the dynamic equation, and an encrypted chaotic equation and a decrypted chaotic equation are obtained; (c) an error state is defined, and the Obtaining a differential dynamic equation by subtracting the chaotic equation of the decryption end from the chaotic equation of the encryption end; (d) defining a conversion plane, and converging the differential dynamic equation to 0 by using the sliding mode to stabilize the state error response; and (e) The synchronization control unit detects the digital chaotic signal and enters a sliding mode to synchronize the synchronous chaotic signal with the digital chaotic signal. According to the chaotic signal synchronization method of claim 4, wherein in the step (a), the dynamic equation of the scattered chaotic signal is: x _d (k+1)T=x _d (KT)+Hg (x _d (KT)); y _d (KT) = Cx _d (KT). The chaotic signal synchronization method according to claim 5, wherein in the step (c), the error state is e(k)=x _s (k)−x _m (k). According to the chaotic signal synchronization method of claim 6, wherein in the step (d), the conversion plane is s(k)=e _s (k)+ce ₁ (k), and the sliding mode is The equation for the differential dynamic equation to converge to 0 is as follows: According to the chaotic signal synchronization method of claim 7, wherein in the step (e), the synchronization control unit is the following equation: u(k)=-f ₁ (e(k))-αs(k ). According to the chaotic signal synchronization method of claim 8, further comprising a step (f), the encrypted dynamic private key generator receives the digital chaotic signal of the encrypted end signal generator, and the decrypted dynamic private key generator receives the The synchronization chaotic signal of the end signal generator is decrypted to synchronize the encrypted dynamic private key with the decrypted dynamic private key. According to the chaotic signal synchronization method of claim 9, further comprising a step (g), the encryption calculator encrypts the image digital information into the image encryption signal by using the encrypted dynamic private key, and the decryption calculator uses The synchronous decryption dynamic private key decrypts the image encrypted signal into decoded image information.