WO2013167087A2

WO2013167087A2 - Encryption method, server, decryption method, terminal and encryption/decryption system

Info

Publication number: WO2013167087A2
Application number: PCT/CN2013/080305
Authority: WO
Inventors: 李�昊
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-05-24
Filing date: 2013-07-29
Publication date: 2013-11-14
Also published as: CN104184921B; CN104184921A; WO2013167087A3

Abstract

Disclosed is an encryption method. The encryption method comprises: obtaining a binary image as an original image; arranging the original image according to a coordinate sequence to generate a first one-dimensional array; obtaining the panel number of a terminal; according to the panel number of the terminal, encrypting the first one-dimensional array to generate a second one-dimensional array; and in accordance with the coordinate sequence, enabling the second one-dimensional array to generate an encryption image. Also disclosed at the same time are a decryption method, a server, a terminal and an encryption/decryption system. The present invention can be applied to the digital image anti-counterfeiting technology of terminal products, and the application is simple.

Description

Encryption method and server, decryption method and terminal, and encryption and decryption system

Technical field

The present invention relates to the field of images, and more particularly to an encryption method and server, a decryption method and terminal, and an encryption and decryption system. Background technique

As an important branch of information security technology, digital watermarking technology has been widely applied and in-depth research. It embeds an invisible mark into a multimedia information product without causing perception, identifying the original author's ownership of the work or verifying the integrity of the information.

As the terminal market continues to grow and develop, it is increasingly important to strengthen the protection of property rights of terminal products. However, in the prior art, digital image anti-counterfeiting technology is more complicated. Summary of the invention

In view of this, the main purpose of the embodiments of the present invention is to provide an easy-to-use encryption method, a server, a decryption method, a terminal, and an encryption and decryption system, which can perform anti-counterfeiting authentication, low-cost application, and low cost on digital images of terminal products. And safe and reliable.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides an encryption method, where the method includes:

Obtaining a binary image as the original image;

Arranging the original images in a coordinate order to generate a first one-dimensional array;

Obtaining a board number of the terminal corresponding to the original image;

Encrypting the first-dimensional array according to the board number of the terminal to generate a second One-dimensional array

The second one-dimensional array is generated in an encrypted image in a coordinate order.

In the above solution, the encrypting the first-dimensional array according to the board number of the terminal to generate a second one-dimensional array includes:

Generating a one-dimensional chaotic sequence according to the board number of the terminal;

And performing binarization processing on the one-dimensional chaotic sequence according to the board number of the terminal to generate a binary sequence;

The binary sequence is XORed with the first one-dimensional array to generate a second one-dimensional array.

In the above solution, the generating a one-dimensional chaotic sequence according to the board number of the terminal, including: generating an initial value according to a board number of the terminal;

According to the initial value, iteratively according to the formula ^^ ^^-^, to obtain a one-dimensional chaotic sequence x(k);

Where ^ is the bif rcation parameter, ^{0 ≤ ≤ 4} ; k is the sequence number of the iteration number; is the element of the one-dimensional chaotic sequence; '· is the serial number of the element; , ¹ , ² ...; ^x . Is the initial value.

In the foregoing solution, the generating an initial value according to the board number of the terminal, including: acquiring a number on the predetermined number of digits N in the board number, and combining to generate a first value;

And summing the key values M and 10 ^N corresponding to the board number to obtain a second value; the key value M is a natural number greater than or equal to 0 and less than or equal to 2 ^N ;

Dividing the first value by the second value results in the initial value.

In the above solution, the two-dimensional chaotic sequence is binarized according to the board number of the terminal, and a binary sequence is generated, including:

Obtaining a threshold value τ corresponding to the board number of the terminal, 0< τ <1; Il if x(k)≥r

L(k)= i

According to the threshold, the formula is calculated: I ⁰ if ^{x(k) <r};

^L ( ^k ) is a binary sequence; x(k) is a one-dimensional chaotic sequence.

An embodiment of the present invention further provides a decryption method, where the method includes:

Extracting an encrypted image;

Arranging the encrypted images in a coordinate order to generate a first one-dimensional array;

Obtaining, according to the board number of the terminal corresponding to the encrypted image, a branching parameter corresponding to the board number of the terminal and a threshold corresponding to the board number of the terminal;

Decrypting the first-dimensional array according to the branching parameter and the threshold, to generate a second one-dimensional array;

Generating the original image in the coordinate order of the second one-dimensional array;

The original image is displayed.

In the above solution, the decrypting process is performed on the first-dimensional group according to the branching parameter and the threshold, to generate a second one-dimensional array, including:

Generating a one-dimensional chaotic sequence according to the branching parameter;

And performing, according to the threshold, binarizing the one-dimensional chaotic sequence to generate a binary sequence; performing an exclusive-OR operation on the binary sequence with the first one-dimensional array to generate a second one-dimensional array.

In the foregoing solution, the generating a one-dimensional chaotic sequence according to the branching parameter includes: generating an initial value according to a board number of the terminal;

According to the initial value, iteratively according to the formula ^^ ^^-^), to obtain a one-dimensional chaotic sequence x(k);

Where ^ is the branching parameter, ^{0 ≤} ^ ^{≤ 4} ; k is the number of iterations; is the element of the one-dimensional chaotic sequence; '· is the serial number of the element; '^. , ¹ , ² ...; ^x . Is the initial value.

In the above solution, the generating an initial value according to the board number of the terminal includes: Obtaining a number on the predetermined number of digits in the board number, combining to generate a first value; obtaining a key value M corresponding to the board number from the server;

And summing the key value corresponding to the board number with 10 ^N to obtain a second value; the key value is a natural number greater than or equal to 0 and less than or equal to 2 ^N ;

Dividing the first value by the second value results in the initial value.

In the above solution, performing the binarization processing on the one-dimensional chaotic sequence according to the threshold to generate a binary sequence, including:

If x(k)≥r

If x(k)<r

^L ( ^k ) is a 0-1 sequence; x(k) is a one-dimensional chaotic sequence; τ is a threshold, 0 < τ < 1.

The embodiment of the present invention further provides a server, where the server includes: a first acquiring unit, a first generating unit, a second acquiring unit, a second generating unit, and a third generating unit; wherein, the first acquiring unit, Configured to obtain a binary image as the original image;

The first generating unit is configured to arrange the original images in a coordinate order to generate a first

- dimension arrays;

The second acquiring unit is configured to acquire a board number of the terminal corresponding to the original image, and the second generating unit is configured to perform encryption processing on the first-dimensional array according to a board number of the terminal, and generate The second one-dimensional array;

The third generating unit is configured to generate the encrypted image in the coordinate order of the second one-dimensional array.

The embodiment of the present invention further provides a terminal, where the terminal includes: an extracting unit, a first generating unit, an obtaining unit, a second generating unit, a third generating unit, and a display unit; wherein the extracting unit is configured to extract Encrypted image;

The first generating unit is configured to arrange the encrypted images in a coordinate order to generate a first-dimensional array;

The obtaining unit is configured to: according to the board number of the terminal corresponding to the encrypted image, from the server Obtaining a branching parameter corresponding to the board number of the terminal and a threshold corresponding to the board number of the terminal; the second generating unit is configured to: according to the branching parameter and the threshold,

- the dimension array is decrypted to generate a second one-dimensional array;

The third generating unit is configured to generate the original image in the coordinate order of the second one-dimensional array.

In the above solution, the terminal includes: a display unit configured to display the original image. An embodiment of the present invention further provides an encryption and decryption system, where the system includes: a terminal and a server;

The server is configured to acquire a binary image as an original image; arrange the original images in a coordinate order to generate a first-dimensional array; and obtain a board number of the terminal corresponding to the original image; according to the board number of the terminal, Encrypting the first-dimensional array to generate a second one-dimensional array; and generating the encrypted image by the second one-dimensional array according to a coordinate order;

The terminal is configured to extract an encrypted image; the encrypted image is arranged in a coordinate order to generate a first-dimensional array; and the branch corresponding to the board number of the terminal is obtained from the server according to the board number of the terminal a parameter and a threshold corresponding to the board number of the terminal; decrypting the first-dimensional array according to the branching parameter and the threshold, to generate a second one-dimensional array; and the second one-dimensional array The original image is generated in the order of the coordinates.

The foregoing technical solutions of the embodiments of the present invention have the following advantages: The encryption method and the server, the decryption method, the terminal, and the encryption and decryption system provided by the embodiments of the present invention generate an encrypted image by using an encryption technology, and then place the encrypted image in the terminal product. In the subsequent process, the encrypted image can be decrypted according to the user instruction, and the decrypted image is displayed, so that the user can perform anti-counterfeiting authentication on the terminal product by viewing the decrypted image. DRAWINGS

1 is a schematic flowchart of an encryption method according to an embodiment of the present invention;

2 is a schematic flowchart of a decryption method according to an embodiment of the present invention; 3 is a schematic structural diagram of a server according to an embodiment of the present invention;

4 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a structure of an encryption and decryption system according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic flowchart of an application scenario according to an embodiment of the present invention;

7 is a schematic diagram of an original image according to an embodiment of the present invention;

FIG. 8 is a schematic diagram showing an effect of an encrypted image encrypted by the original image according to an embodiment of the present invention. FIG. 9 is a schematic diagram of an information table of a database of a server according to an embodiment of the present invention.

detailed description

The technical problems, the technical solutions, and the advantages of the present invention will become more apparent from the following detailed description.

First, the overall idea of the embodiment of the present invention will be described. The embodiment of the invention provides an encryption method and a server, and a decryption method and a terminal. First, the server generates an encrypted image by using an encryption technology, and then places the encrypted image in the terminal product. In the subsequent process, the terminal performs the encrypted image according to the user instruction. The decrypted image is displayed, and the decrypted image is displayed, so that the user can perform anti-counterfeiting authentication on the terminal product by viewing the decrypted image. The key for decrypting the encrypted image is obtained by the terminal and the server during the interaction process.

As shown in FIG. 1 , an encryption method is performed according to an embodiment of the present invention, where the method includes: Step 11: acquiring a binary image as an original image;

Step 12: Arranging the original images in a coordinate order to generate a first one-dimensional array; Step 13: acquiring a board number of the corresponding terminal of the original image;

Step 14, according to the board number of the terminal, encrypting the first-dimensional array to generate a second one-dimensional array;

Step 15. Generate the encrypted image in the coordinate order of the second one-dimensional array. The step 14 of performing encryption processing on the first-dimensional array according to the board number of the terminal to generate a second one-dimensional array includes:

Step 141: Generate a one-dimensional chaotic sequence according to the board number of the terminal.

Step 142: Perform binarization processing on the one-dimensional chaotic sequence according to the board number of the terminal, to generate a binary sequence.

Step 143: XOR the binary sequence with the first-dimensional array to generate a second one-dimensional array.

The step 141 of generating a one-dimensional chaotic sequence according to the board number of the terminal includes: Step 1411: Generate an initial value according to the board number of the terminal;

Step 1412, according to the initial value, according to the formula ^x ' ₊ i = ^^ - ^x ' ), to obtain a one-dimensional chaotic sequence x (k);

Where ^ is the branching parameter, ^{0 ≤} ^ ^{≤ 4} ; k is the sequence number of the iteration number; is the element of the one-dimensional chaotic sequence; is the serial number of the element; '' = ( , ² ; ^x is the initial value.

For example, suppose 〃 = 4, ^χ . =0·7, by iterative formula, X ( 4 ) = ( 0.84, 0.5376 , 0.99434496, 0.0224922420903936 ) is obtained.

The step 1411 of generating an initial value according to the board number of the terminal includes: Step 14111: Acquire a number on the predetermined number of bits in the board number, and combine to generate a first value. For example, get the last six digits of the board number to form the first value.

Step 14112, the corresponding key on the number plate with 10 ^Ν Μ value are summed to obtain a second value; Μ the key value is greater than or equal to and less than or equal to a natural number of 02 ^v;

Step 14113, dividing the first value by the second value to obtain the initial value.

The step of performing a binarization process on the one-dimensional chaotic sequence according to the board number of the terminal, and generating a binary sequence includes:

Step 1421: Obtain a threshold value τ corresponding to the board number of the terminal, where 0<τ<1; Il if x(k)≥r

L(k)= i

Step 1422, according to the threshold, calculate a formula: L ⁰ if ^x(k ) ^<r ;

^L ( ^k ) is a binary sequence; x(k) is a one-dimensional chaotic sequence.

As shown in FIG. 2, a decryption method is performed according to an embodiment of the present invention, where the method includes: Step 21: extract an encrypted image;

Step 22: Arranging the encrypted images in a coordinate order to generate a first one-dimensional array. Step 23: Obtain, according to the board number of the terminal corresponding to the encrypted image, a branch parameter corresponding to a board number of the terminal, and a location The threshold corresponding to the board number of the terminal;

Step 24: Perform decryption processing on the first-dimensional array according to the branching parameter and the threshold, to generate a second one-dimensional array;

Step 25: Generate the original image according to the coordinate order of the second one-dimensional array;

Step 26, displaying the original image.

Here, the board number of the encrypted image corresponding terminal may be the same as the board number of the terminal corresponding to the original image involved in the foregoing encryption method.

The step 24 of decrypting the first-dimensional array according to the branching parameter and the threshold, and generating a second one-dimensional array includes:

Step 241: Generate a one-dimensional chaotic sequence according to the branching parameter.

Step 242: Perform binarization processing on the one-dimensional chaotic sequence according to the threshold, to generate a binary sequence.

Step 243: XOR the binary sequence with the first-dimensional array to generate a second one-dimensional array.

The step 241 of generating a one-dimensional chaotic sequence according to the branching parameter includes: Step 2411: Generate an initial value according to a board number of the terminal;

Step 2412, according to the initial value, according to the formula ^x ' ₊ i = ^^ - ^x ' ), to obtain a one-dimensional chaotic sequence x (k); Where, is the branching parameter, ^{0 ≤} ^ ^{≤ 4} ; k is the sequence number of the iteration number; is the element of the one-dimensional chaotic sequence; '· is the serial number of the element; '^. , ¹ , ² ...; ^X . Is the initial value.

The step 2411 of generating an initial value according to the board number of the terminal includes: Step 24111: Acquire a number on the predetermined number of bits N in the board number, and combine to generate a first value;

Step 24112, obtaining a key value M corresponding to the board number from the server;

Step 24113: The key value corresponding to the board number is summed with 10 ^N to obtain a second value; the key value is a natural number greater than or equal to 0 and less than or equal to 2^^;

Step 24114, dividing the first value by the second value to obtain the initial value.

The step 242 of performing the binarization processing on the one-dimensional chaotic sequence according to the threshold to generate a binary sequence is specifically:

If x(k)≥r

If x(k)<r

As shown in FIG. 3, a server is provided in the embodiment of the present invention, where the server includes: a first acquiring unit 31 configured to acquire a binary image as an original image;

The first generating unit 32 is configured to arrange the original images in a coordinate order to generate a first one-dimensional array;

The second obtaining unit 33 is configured to acquire the board number of the terminal corresponding to the original image. The second generating unit 34 is configured to perform encryption processing on the first-dimensional array according to the board number of the terminal, to generate a second One-dimensional array

And the third generation unit 35 is configured to generate the encrypted image in the coordinate order of the second one-dimensional array.

As shown in FIG. 4, the terminal is provided by the embodiment of the present invention, and the terminal includes: an extracting unit 41 configured to extract an encrypted image; The first generating unit 42 is configured to arrange the encrypted images in a coordinate order to generate a first one-dimensional array;

The obtaining unit 43 is configured to obtain, according to the board number of the terminal corresponding to the encrypted image, a branching parameter corresponding to the board number of the terminal and a threshold corresponding to the board number of the terminal;

The second generating unit 44 is configured to perform decryption processing on the first one-dimensional array according to the branching parameter and the threshold, to generate a second one-dimensional array;

And the third generation unit 45 is configured to generate the original image in the coordinate order of the second one-dimensional array.

Preferably, the terminal further includes: a display unit 46 configured to display the original image. In this embodiment, the board number of the original image corresponding terminal and the board number of the terminal corresponding to the encrypted image may be the same value.

As shown in FIG. 5, an encryption and decryption system is provided in an embodiment of the present invention, where the system includes: a terminal 51 and a server 52;

The server 52 is configured to acquire a binary image as an original image; arrange the original images in a coordinate order to generate a first one-dimensional array; obtain a board number of the terminal corresponding to the original image; Encrypting the first-dimensional array to generate a second one-dimensional array; and generating the second one-dimensional array to generate an encrypted image according to a coordinate order;

The terminal 51 is configured to extract an encrypted image; the encrypted images are arranged in a coordinate order to generate a first-dimensional array; and the board number of the terminal is obtained from the server 52 according to the board number of the terminal. a branching parameter and a threshold corresponding to the board number of the terminal; decrypting the first-dimensional array according to the branching parameter and the threshold, to generate a second one-dimensional array; The dimension array generates an original image in coordinate order; the original image is displayed.

The application scenario of the embodiment of the present invention is described below.

The embodiment of the invention provides a built-in image anti-counterfeiting method based on chaotic encryption technology, which can be applied to digital image anti-counterfeiting technology of terminal products, which is simple in application, low in cost, safe and reliable. The terminal can obtain the relevant parameters of the decryption from the server through the wireless network, and complete the authentication process of the copyright information on the terminal. Specifically: First, the chaotic encryption technology is used to generate an encrypted image (black and white image, that is, only two gray scales of 0 and 1), and the encrypted image is placed in the terminal product. Then, the user can perform anti-counterfeiting authentication of the product by means of manual clicking. After the authentication is passed, the authentication result is fed back to the user through the terminal, thereby achieving the purpose of anti-counterfeiting.

As shown in FIG. 6, the embodiment of the present invention includes four processes: a process of generating an encrypted image, a process of acquiring a key data by a user, a decryption process, and a user interface (UI, User Interface) interaction process.

The generation process of the encrypted image is described below.

First, prepare a binary original image (see Figure 7), and then arrange the images in a one-dimensional array in coordinate order. The original image usually has certain meaning information, such as the logo of the operator or equipment supplier or trademark logo information.

Then, according to the initial value corresponding to the product, a one-dimensional chaotic sequence is produced, and the sequence is binarized according to the threshold.

The specific method and principle are as follows: Regression Logistic mapping is a very simple dynamic system in chaotic systems, which is defined as follows: ≤ / ≤ 4 is called the branching parameter, (0, 1). When 3.5699456... < / ≤ 4, the _Logistic mapping works in a chaotic state. That is, by the initial value ^x . The sequence l ''^' ¹ ' ² } generated under the action of the Logistic map is aperiodic, does not converge and is very sensitive to the initial value.

Set a chaotic initial value χθ and μ, and iterate according to formula 1, to obtain chaotic sequence x(k). The initial value can be divided by the last ⁶ digits of the device board number divided by 1XXXXXX. XXXXXX is the key information corresponding to the product (that is, the key value M described above), and the value ranges from 0 to 999999. The last 6 digits of the board number are all 0s, and χθ is 0.5 by default.

Then, using the threshold threshold method to get the 0-1 sequence L(k) (k = l, 2, ..., ΜΙ xM2), the threshold The threshold method is defined as follows:

Where τ is the threshold value, and the value range is 0<τ<1.

Then, the binary watermark image is encrypted by the generated 0-1 sequence L(k) to obtain an encrypted watermark vector sequence. Specifically: Wm = Wa @ L(k) (m=l, 2, ... Ml xM2), @ denotes an exclusive OR operation. As shown in Figure 9, ΧΧΧΧΧΧ, μ, and τ are stored together with the product-specific encryption information and the product board number in the server's network database.

Finally, as shown in Fig. 8, the encrypted one-dimensional vector is restored back to the two-dimensional array (image) according to the coordinates, thus completing the generation of the encrypted image. The generated encrypted image will be placed in the Encrypting File System (EFS) for UI display. In this embodiment, χ0=0.890111, ΧΧΧΧΧΧ=123456, μ=3.7, τ=0.4. The production of the entire encrypted image and the database storage of the key information are all completed during the production phase.

The process of obtaining a key data by a user is described below.

The terminal is connected to the network server to obtain key information corresponding to the product.

The format is as follows:

The terminal sends the data format a Get (Product ID);

The terminal receives the data format, a Receive (product ID, XXXXXX, μ, τ);

After receiving the key request of the terminal, the network server searches for the corresponding key information with reference to the figure, and sends the information to the terminal according to the established format to complete the process of acquiring the key information.

The decryption process is described below.

The decryption process is the reverse process of the encryption process. For details, please refer to the decryption method mentioned above. First, according to the key information obtained from the network database, the last 6 digits of the board number are combined according to the algorithm in the encryption process to obtain a decrypted chaotic sequence. Then, the decrypted binary sequence is obtained by using the threshold threshold method. The original picture is obtained by XORing the decrypted binary sequence with the binary encrypted image in the terminal EFS partition, thereby completing the entire decryption process. The decryption process is the end The end is done independently.

The following describes the UI interaction process:

The user initiates an authentication operation request through the UI interface, and after the terminal decrypts the original image, the authentication result is viewed to view the decrypted original image.

Please refer to Figure 6 for the specific process.

The following is the usage scenario: After the user purchases the terminal product, the product is authenticated by the built-in anti-counterfeiting authentication function, so that the user can intuitively judge the authenticity of the product.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

Claim

An encryption method, the method comprising:

Obtaining a binary image as the original image;

Obtaining a board number of the terminal corresponding to the original image;

Encrypting the first-dimensional array according to the board number of the terminal to generate a second one-dimensional array;

The encryption method according to claim 1, wherein the encrypting the first-dimensional array according to the board number of the terminal to generate a second one-dimensional array comprises:

The encryption method according to claim 2, wherein the generating a one-dimensional chaotic sequence according to the board number of the terminal comprises:

Generating an initial value according to the board number of the terminal;

The encryption method according to claim 3, wherein the generating an initial value according to the board number of the terminal includes: Obtaining a number on the predetermined number of digits N in the board number, and combining to generate a first value; summing the key values M and 10 ^N corresponding to the board number to obtain a second value; the key value M is a natural number greater than or equal to 0 and less than or equal to 2 ^N ;

Dividing the first value by the second value results in the initial value.

The encryption method according to claim 2, wherein the performing the binarization processing on the one-dimensional chaotic sequence according to the board number of the terminal to generate a binary sequence comprises:

Obtaining a threshold value τ corresponding to the board number of the terminal, 0< τ <1;

^L ( ^k ) is a binary sequence; x(k) is a one-dimensional chaotic sequence.

6. A method of decrypting, the method comprising:

Extracting an encrypted image;

The second one-dimensional array is generated in the coordinate order to generate an original image.

The decryption method according to claim 6, wherein the decrypting the first-dimensional array according to the branching parameter and the threshold to generate a second one-dimensional array comprises: Generating a branching parameter to generate a one-dimensional chaotic sequence;

The decryption method according to claim 7, wherein the generating a one-dimensional chaotic sequence according to the branching parameter comprises: Generating an initial value according to the board number of the terminal;

The decryption method according to claim 8, wherein the generating an initial value according to the board number of the terminal includes:

Obtaining a number on the predetermined number of digits N in the board number, and combining to generate a first value; N is a natural number greater than or equal to 1;

Obtaining a key value M corresponding to the board number from the server;

a key value corresponding to the board number and a natural number whose key value is greater than or equal to 0 and less than or equal to 2 ^N ;

Dividing the first value by the second value results in the initial value.

The decryption method according to claim 7, wherein the performing a binarization process on the one-dimensional chaotic sequence according to the threshold to generate a binary sequence includes:

The decryption method according to any one of claims 6 to 10, wherein after the generating the original image by the second one-dimensional array in the coordinate order, the method further comprises:

The original image is displayed.

A server, the server includes: a first acquiring unit, a first generating unit, a second acquiring unit, a second generating unit, and a third generating unit;

The first acquiring unit is configured to acquire a binary image as an original image;

The first generating unit is configured to arrange the original images in a coordinate order to generate a first - dimension arrays;

A terminal, the terminal includes: an extracting unit, a first generating unit, an obtaining unit, a second generating unit, and a third generating unit;

The extracting unit is configured to extract an encrypted image;

The acquiring unit is configured to acquire, according to the board number of the terminal corresponding to the encrypted image, a branching parameter corresponding to the board number of the terminal and a threshold corresponding to the board number of the terminal; the second generating unit, And configuring, according to the branching parameter and the threshold, decrypting the first-dimensional array to generate a second one-dimensional array;

The terminal according to claim 13, wherein the terminal further comprises: a display unit configured to display the original image.

An encryption and decryption system, the system comprising: a server and a terminal; wherein the server is configured to acquire a binary image as an original image; and the original images are arranged in a coordinate order to generate a first one-dimensional array; Obtaining a board number of the terminal corresponding to the original image; performing encryption processing on the first-dimensional array according to a board number of the terminal to generate a second one-dimensional array; and performing the second one-dimensional array according to a coordinate order Generating an encrypted image;

The terminal is configured to extract the encrypted image; and the encrypted image is arranged in a coordinate order a column, generating a first-dimensional array; obtaining, according to a board number of the terminal, a branching parameter corresponding to a board number of the terminal and a threshold corresponding to a board number of the terminal; And the threshold, decrypting the first-dimensional array to generate a second one-dimensional array; and generating the original image by the second one-dimensional array in a coordinate order.