CN118590589A - Image encryption method, device and related products - Google Patents

Abstract

The present application discloses an image encryption method, device and related products. The image to be encrypted is preprocessed to obtain the red channel array, green channel array and blue channel array corresponding to the image to be encrypted; the red channel array, green channel array and blue channel array are subjected to channel scrambling processing to obtain the channel scrambled array corresponding to the image to be encrypted; the channel scrambled array corresponding to the image to be encrypted is encrypted according to the image encryption rule set to obtain the encrypted image. It can be seen that in the present application, the red channel array, green channel array and blue channel array corresponding to the image to be encrypted are scrambled, that is, the red channel array, green channel array and blue channel array are mixed into a channel scrambled array, avoiding the method of separately encrypting the red channel array, green channel array and blue channel array in the related art, so that the present application improves the security of image encryption by performing channel scrambling operations.

Description

Image encryption method, device and related products

Technical Field

The present application relates to the field of image encryption technology, and in particular to an image encryption method, device and related products.

Background Art

With the rapid development and popularization of multimedia related technologies and network communication technologies, images in various fields are increasingly used in information dissemination. However, some images usually contain personal privacy and sensitive information, which need to be encrypted before transmission to ensure the security of the image during transmission. In related technologies, traditional encryption algorithms (such as AES, RSA, IDEA, etc.) are usually used to encrypt images. Since images are a special data format and have a large amount of highly redundant data, the encrypted images obtained by traditional encryption algorithms can still be easily identified, resulting in low security of image encryption.

Therefore, how to improve the security of image encryption is a key issue that technicians in this field are concerned about.

Summary of the invention

Based on the above problems, the present application provides an image encryption method, device and related products, aiming to improve the security of image encryption. The embodiments of the present application disclose the following technical solutions:

In a first aspect, the present application discloses an image encryption method, comprising:

Acquire an image to be encrypted and an image encryption rule set, wherein the image encryption rule set is used to encrypt the image to be encrypted;

Preprocessing the image to be encrypted to obtain a red channel array, a green channel array, and a blue channel array corresponding to the image to be encrypted;

Performing channel scrambling processing on the red channel array, the green channel array and the blue channel array to obtain a channel scrambled array corresponding to the image to be encrypted;

The channel scrambled array corresponding to the image to be encrypted is encrypted according to the image encryption rule set to obtain an encrypted image.

Optionally, the red channel array includes a first red channel and a second red channel, the green channel array includes a first green channel and a second green channel, and the blue channel array includes a first blue channel and a second blue channel;

The scrambling process is performed on the red channel array, the green channel array, and the blue channel array to obtain a channel scrambled array corresponding to the image to be encrypted, including:

splicing the first red channel in the red channel array, the first green channel in the green channel array, and the first blue channel in the blue channel array to obtain a first scrambled array;

splicing the second red channel in the red channel array, the second green channel in the green channel array, and the second blue channel in the blue channel array to obtain a second scrambled array;

The first scrambled array and the second scrambled array are concatenated to obtain a channel scrambled array corresponding to the image to be encrypted.

Optionally, before the channel scrambling array corresponding to the image to be encrypted is processed according to the image encryption rule set to obtain the encrypted image, the method further includes:

Get the image encryption key generated by the random number generator;

Performing group processing on the channel scrambled array to obtain a plurality of groups to be encrypted;

A plurality of image subkeys are obtained according to the image encryption key and the plurality of groups to be encrypted, wherein the number of the plurality of groups to be encrypted is the same as the number of the plurality of image subkeys.

Optionally, the multiple groups to be encrypted include a target group to be encrypted, and the processing of the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set to obtain the encrypted image includes:

Dividing the target to-be-encrypted group to obtain an n-2th bit group and an n-1th bit group, where n is greater than or equal to 3;

The n-2th bit group and the n-1th bit group are encrypted according to the image encryption rule set and the multiple image subkeys to obtain an encrypted image.

Optionally, before encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the multiple image subkeys to obtain the encrypted image, the method further includes:

extracting an n-2th image subkey corresponding to the n-2th bit group and the n-1th bit group from the multiple image subkeys;

The step of encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the multiple image subkeys to obtain an encrypted image includes:

The n-2th bit group and the n-1th bit group are encrypted according to the image encryption rule set and the n-2th image subkey to obtain an encrypted image.

Optionally, encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the n-2th image subkey to obtain an encrypted image includes:

Encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the n-2th image subkey to obtain an nth bit group;

Performing expansion processing on the n-2th image subkey to obtain the n-1th image subkey corresponding to the n-1th bit group and the nth bit group;

Encrypting the n-1th bit group and the nth bit group according to the image encryption rule set and the n-1th image subkey to obtain an n+1th bit group;

An encrypted image is obtained according to the nth bit group and the (n+1)th bit group.

Optionally, after obtaining the encrypted image according to the nth bit group and the n+1th bit group, the method further includes:

Parsing the encrypted image to obtain the nth bit group and the n+1th bit group;

Performing reverse iterative processing on the nth bit group and the n+1th bit group to obtain the n-2th bit group and the n-1th bit group;

The image to be encrypted is obtained according to the n-2th bit group and the n-1th bit group.

In a second aspect, the present application discloses an image encryption device, comprising:

An image rule acquisition unit, used to acquire an image to be encrypted and an image encryption rule set, wherein the image encryption rule set is used to encrypt the image to be encrypted;

The image processing unit to be encrypted is used to pre-process the image to be encrypted to obtain a red channel array, a green channel array and a blue channel array corresponding to the image to be encrypted;

A scrambled array obtaining unit, used for performing channel scrambling processing on the red channel array, the green channel array and the blue channel array to obtain a channel scrambled array corresponding to the image to be encrypted;

The encrypted image obtaining unit is used to encrypt the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set to obtain an encrypted image.

Optionally, the scramble array obtaining unit is specifically used for:

splicing the first red channel in the red channel array, the first green channel in the green channel array, and the first blue channel in the blue channel array to obtain a first scrambled array;

splicing the second red channel in the red channel array, the second green channel in the green channel array, and the second blue channel in the blue channel array to obtain a second scrambled array;

The first scrambled array and the second scrambled array are concatenated to obtain a channel scrambled array corresponding to the image to be encrypted.

Optionally, the device further comprises:

An image key acquisition unit, used to acquire an image encryption key generated by a random number generator;

A unit for obtaining a group to be encrypted, used for performing group processing on the channel scrambling array to obtain a plurality of groups to be encrypted;

The image subkey obtaining unit is used to obtain a plurality of image subkeys according to the image encryption key and the plurality of groups to be encrypted, wherein the number of the plurality of groups to be encrypted is the same as the number of the plurality of image subkeys.

Optionally, the encrypted image obtaining unit includes:

a to-be-encrypted group division unit, configured to divide the target to-be-encrypted group into an n-2th bit group and an n-1th bit group, wherein n is greater than or equal to 3;

The bit group encryption unit is used to encrypt the n-2th bit group and the n-1th bit group according to the image encryption rule set and the multiple image subkeys to obtain an encrypted image.

Optionally, the device further comprises:

a first image subkey extraction unit, configured to extract an n-2th image subkey corresponding to the n-2th bit group and the n-1th bit group from the plurality of image subkeys;

The bit group encryption unit is specifically used for:

The n-2th bit group and the n-1th bit group are encrypted according to the image encryption rule set and the n-2th image subkey to obtain an encrypted image.

Optionally, the bit group encryption unit is further used for:

Encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the n-2th image subkey to obtain an nth bit group;

Performing expansion processing on the n-2th image subkey to obtain the n-1th image subkey corresponding to the n-1th bit group and the nth bit group;

Encrypting the n-1th bit group and the nth bit group according to the image encryption rule set and the n-1th image subkey to obtain an n+1th bit group;

An encrypted image is obtained according to the nth bit group and the (n+1)th bit group.

Optionally, the device further comprises:

An encrypted image parsing unit, used for parsing the encrypted image to obtain the nth bit group and the n+1th bit group;

a group reverse iteration unit, configured to perform reverse iteration processing on the nth bit group and the n+1th bit group to obtain the n-2th bit group and the n-1th bit group;

The to-be-encrypted image obtaining unit is used to obtain the to-be-encrypted image according to the n-2th bit group and the n-1th bit group.

In a third aspect, an embodiment of the present application provides an electronic device, including:

Memory for storing computer programs;

A processor is used to implement the steps of the image encryption method in the first aspect when executing the computer program.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the image encryption method in the first aspect are implemented.

Compared with the prior art, this application has the following beneficial effects:

In the present application, an image to be encrypted and an image encryption rule set are first obtained; thereafter, the image to be encrypted is preprocessed to obtain a red channel array, a green channel array and a blue channel array corresponding to the image to be encrypted, and channel scrambling processing is performed on the red channel array, the green channel array and the blue channel array to obtain a channel scrambled array corresponding to the image to be encrypted; finally, the channel scrambled array corresponding to the image to be encrypted is encrypted according to the image encryption rule set to obtain an encrypted image.

It can be seen that in the present application, the red channel array, green channel array and blue channel array corresponding to the image to be encrypted are scrambled, that is, the red channel array, green channel array and blue channel array are mixed into a channel scrambled array, and the encryption of the image to be encrypted is implemented using the image encryption rule set. In this way, the method of performing separate encryption of the red channel array, the green channel array and the blue channel array in the related art is avoided. In this way, the present application improves the security of image encryption by performing channel scrambling operations and encryption operations of the image encryption rule set.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic diagram of image encryption provided in the related art;

FIG2 is a flow chart of an image encryption method provided by an embodiment of the present application;

FIG3 is a flow chart of channel scrambling of an image encryption method provided in an embodiment of the present application;

FIG4 is a flowchart of an iterative process of an image encryption method provided in an embodiment of the present application;

FIG5 is a full flow chart of image encryption of an image encryption method provided in an embodiment of the present application;

FIG6 is a schematic diagram of the structure of an image encryption device provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

It should be noted that the image encryption method, device and related products provided by the present application are used in the field of image encryption technology. The above are only examples and do not limit the application field of the method and device names provided by the present application.

As described above, with the rapid development and popularization of multimedia related technologies and network communication technologies, images in various fields are increasingly used in information dissemination. However, some images usually contain personal privacy and sensitive information, which need to be encrypted before transmission to ensure the security of the image during transmission.

In the related technology, traditional encryption algorithms are usually used to encrypt images, wherein the traditional encryption algorithms in the related technology are usually encryption algorithms such as AES, RSA, IDEA, etc., which are usually used to encrypt text data or binary data. As an image is a special data format, when the image is encrypted using traditional encryption algorithms such as AES, the key space is small and the encryption algorithm has a weak ability to resist attacks, resulting in low security of image encryption.

As shown in FIG1 , FIG1 is a schematic diagram of image encryption provided in the related art, FIG1 (a) is the image to be encrypted, and FIG1 (b) is the encrypted image obtained by using the traditional encryption algorithm. It can be seen that the general outline of FIG1 (a) can still be identified through FIG1 (b), that is, the encrypted image obtained by the traditional encryption algorithm can still be easily identified, resulting in low security of image encryption. Therefore, how to improve the security of image encryption is a key issue that those skilled in the art are concerned about.

Therefore, the inventor proposed the technical solution of the present application, first obtaining the image to be encrypted and the image encryption rule set, then preprocessing the image to be encrypted to obtain the red channel array, green channel array and blue channel array corresponding to the image to be encrypted, and performing channel scrambling processing on the red channel array, green channel array and blue channel array to obtain the channel scrambled array corresponding to the image to be encrypted, and finally encrypting the channel scrambled array corresponding to the image to be encrypted according to the image encryption rule set to obtain the encrypted image.

It can be seen that in the present application, the red channel array, green channel array and blue channel array corresponding to the image to be encrypted are scrambled, that is, the red channel array, green channel array and blue channel array are mixed into a channel scrambled array, and the encryption of the image to be encrypted is implemented using the image encryption rule set. In this way, the method of performing a single encryption of the red channel array, the green channel array and the blue channel array respectively in the related art is avoided. In this way, the present application greatly improves the obfuscation procedure of image encryption by performing channel scrambling operations and encryption operations of the image encryption rule set, thereby improving the security of image encryption.

The method provided in the embodiment of the present application can be executed by software on a terminal device. The terminal device can be, for example, a mobile phone, a tablet computer, a computer, etc. The software can be, for example, system software.

In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

The following is an example of an image encryption method provided by the present application.

Referring to FIG. 2 , which is a flow chart of an image encryption method provided in an embodiment of the present application, as shown in FIG. 2 , the method includes:

S201: Obtain an image to be encrypted and an image encryption rule set.

In this step, the image to be encrypted includes a plaintext RGB image to be encrypted, and the image encryption rule set is randomly generated according to the second-order balanced Moore nearest neighbor cellular automaton rule. The image encryption rule set is used to encrypt the image to be encrypted in the subsequent process, that is, to iteratively process the encrypted image. The number of image encryption rules in the image encryption rule set in the present application can be 64, and the number of image encryption rules is the same as the number of cells in the subsequent bit grouping, which is not specifically limited here.

S202: Preprocess the image to be encrypted to obtain a red channel array, a green channel array, and a blue channel array corresponding to the image to be encrypted.

In this step, the pixel value of the image to be encrypted can be extracted to obtain all the pixel values in the image to be encrypted. Since each pixel value is composed of a red channel value, a green channel value, and a blue channel value, a color image can be generated by combining these three channels. After that, the present application can combine the red channel values, green channel values, and blue channel values corresponding to all pixel values to obtain a red channel array, a green channel array, and a blue channel array corresponding to the image to be encrypted.

S203: Perform channel scrambling processing on the red channel array, the green channel array and the blue channel array to obtain a channel scrambled array corresponding to the image to be encrypted.

In this step, a red channel can be extracted from the red channel array, a green channel can be extracted from the green channel array, and a blue channel can be extracted from the blue channel array, and the red channel, green channel and blue channel can be spliced together to obtain a spliced channel. After that, continue to extract a red channel from the red channel array, extract a green channel from the green channel array, and extract a blue channel from the blue channel array, and splice the red channel, green channel and blue channel together to obtain a spliced channel. And splice the two spliced channels together, so as to repeat the splicing process until all the channels in the red channel array, the green channel array and the blue channel array are extracted.

Specifically, in the present application, the red channel array includes a first red channel and a second red channel, the green channel array includes a first green channel and a second green channel, and the blue channel array includes a first blue channel and a second blue channel. It should be noted that in the present application, the red channel array, the green channel array, and the blue channel array each include two color channels, and in actual applications, the red channel array, the green channel array, and the blue channel array can each include any number of color channels.

The first red channel in the red channel array, the first green channel in the green channel array, and the first blue channel in the blue channel array can be spliced to obtain a first scrambled array, and the second red channel in the red channel array, the second green channel in the green channel array, and the second blue channel in the blue channel array can be spliced to obtain a second scrambled array, and finally the first scrambled array and the second scrambled array are spliced to obtain a channel scrambled array corresponding to the image to be encrypted. In this way, compared with the traditional method of encrypting each channel separately, the channel scrambling method is used in the present application to achieve the obfuscation of the color channels in the image to be encrypted, thereby improving the security of image encryption.

As shown in Figure 3, Figure 3 is a flow chart of channel scrambling of an image encryption method provided by an embodiment of the present application, and Figure 3 shows the process of processing an image to be encrypted with an image size of N×N to obtain a channel scrambled array corresponding to the image to be encrypted. Specifically, the present application obtains three color channel arrays of size N×N (red channel array R(N×N), green channel array G(N×N) and blue channel array B(N×N)) through the image to be encrypted, and then performs channel scrambling processing on the red channel array, the green channel array and the blue channel array to obtain a channel scrambled array of size N×N×3, and the dotted box is a scrambled array obtained by splicing the red channel, the green channel and the blue channel. It can be understood that it can be converted into an array of length N×N×3 in the order of R(1,1)→G(1,1)→B(1,1)→R(1,2)→G(1,2)→B(1,2)→...→R(N,N)→G(N,N)→B(N,N), which is convenient for the subsequent division of the channel scrambled array.

S204: Encrypting the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set to obtain an encrypted image.

First of all, it should be explained that before the present application processes the channel scrambled array corresponding to the encrypted image according to the image encryption rule set and obtains the encrypted image, it can also obtain the image encryption key generated by the random number generator, where the length of the image encryption key is 128 bits to ensure that a sufficiently large key space can be used to resist brute-force key search attacks.

Furthermore, in the present application, the channel scrambled array can be grouped to obtain multiple groups to be encrypted, wherein the size of one group to be encrypted is 128 bits, and each group to be encrypted carries a 32-bit group number. It can be understood that the channel scrambled array can be divided into a 128-bit bit group, and the channel scrambled array can also be divided into a plurality of consecutive 128-bit bit groups. When the channel scrambled array is divided into a plurality of consecutive 128-bit bit groups, the plurality of consecutive 128-bit bit groups can be marked with group numbers to facilitate the expansion of the image key in the subsequent process.

After that, the 32-bit group number n _i corresponding to the multiple groups to be encrypted can be repeated 4 times to form a 128-bit encryption key and an XOR process is performed to obtain an image subkey sk _i corresponding to each group to be encrypted, where i is greater than or equal to 1, and the number of multiple scrambled subarrays is the same as the number of multiple image subkeys, so as to prevent the same original plaintext group data from being encrypted into the same ciphertext group data in the ECB encryption method, ensure one-time one-key, and improve the security of image encryption. In an achievable implementation, when the channel scrambled array is divided into a 128-bit bit group, that is, when the multiple groups to be encrypted include the target group to be encrypted, the 128-bit bit group (target group to be encrypted) can be divided into the n-2th bit group and the n-1th bit group, where the n-2th bit group and the n-1th bit group are both 64-bit bit groups, and n is greater than or equal to 3.

At this time, the image encryption rule set can be used to encrypt the n-2th bit group and the n-1th bit group to obtain an encrypted group corresponding to the group to be encrypted. In another achievable implementation, the encrypted group can be obtained using formula (1), which is specifically embodied as follows:

C ^t = F(C ^t-1 ) ⊕ C ^t-2 Formula (1)

Wherein, C ^t represents an encryption group, F represents an image encryption rule in an image encryption rule set, C ^t-1 represents the current state of the encryption group, and C ^t-2 represents the previous state of the encryption group. It can be understood that in this application, the image encryption rule is mainly used to realize the automaton evolution of cells in the image, so as to generate encryption groups composed of different states at different times by continuously iterating bit groups, thereby realizing the encryption process of the image.

Furthermore, before the present application encrypts the n-2th bit group and the n-1th bit group according to the image encryption rule set and multiple image subkeys to obtain the encrypted image, the n-2th image subkey corresponding to the n-2th bit group and the n-1th bit group can be extracted from the multiple image subkeys, so that the n-2th bit group and the n-1th bit group can be encrypted according to the image encryption rule set and the n-2th image subkey to obtain the encrypted image. In this way, based on the image encryption rule set and the image subkey corresponding to the bit group, the encryption of the bit group is realized.

It should be noted that when the n-2th bit group and the n-1th bit group are encrypted using the image encryption rule set and the n-2th image sub-key, each image encryption rule in the image encryption rule set can be assigned to the cells at the 64 corresponding positions of each bit group, where each bit of the image sub-key sk _i is used to determine whether to use rule R[j] or its corresponding complementary rule for the cell at the current time j of each bit group.

Furthermore, the process of encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the n-2th image subkey to obtain the encrypted image in the present application can also be achieved through the following process: first, encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the n-2th image subkey to obtain the nth bit group, then expanding the n-2th image subkey to obtain the n-1th image subkey corresponding to the n-1th bit group and the nth bit group, and encrypting the n-1th bit group and the n-1th bit group according to the image encryption rule set and the n-1th image subkey to obtain the n+1th bit group, finally determining the encrypted bit group according to the nth bit group and the n+1th bit group, and obtaining the encrypted image based on the encrypted bit group.

It should be noted that the process of obtaining the nth bit group and the n+1th bit group in the present application is an iterative process. The first bit group and the second bit group of the image to be encrypted can be used as the starting basis to continuously iterate the bit grouping to obtain the final bit grouping, so as to achieve obfuscation of the bit grouping during the encryption process and achieve the security of image encryption.

Next, the iterative process of the bit grouping of the present application is described in detail in conjunction with FIG4 . As shown in FIG4 , FIG4 is a flowchart of iterative processing of an image encryption method provided by an embodiment of the present application, and FIG4 shows the process of iterative processing of the bit grouping. Specifically, when the channel scrambled array is divided into a plurality of 128-bit groups to be encrypted, the plurality of groups to be encrypted can be encrypted one by one, and finally the image to be encrypted is determined according to the plurality of encrypted groups to be encrypted.

Further, taking the target group to be encrypted as an example, the image subkey is obtained according to the group number corresponding to the target group to be encrypted and the image encryption key. After that, the first bit group C(0) and the second bit group C(1) in the target group to be encrypted PB are iteratively processed according to the image encryption rule set and the first image subkey SK1 to obtain the third bit group C(2), and the second bit group C(1) and the third bit group C(2) in the target group to be encrypted PB are iteratively processed according to the image encryption rule set and the second image subkey SK2 to obtain the fourth bit group C(3), and the iterative processing work is continuously performed until the n-1th bit group and the nth bit group C(n) in the target group to be encrypted PB are iteratively processed according to the image encryption rule set and the nth image subkey SKn to obtain the n+1th bit group C(n+1), and finally the encryption group CB is determined according to the nth bit group and the n+1th bit group.

It should be noted that, in the iterative process of each group to be encrypted, the image subkey used is determined according to the group to be encrypted, but each iterative process of the group to be encrypted can be subjected to key expansion processing. For example, when iteratively encrypting the i-th group to be encrypted, for each image subkey sk _i , the image subkey after the previous iteration can be shifted 8 bits to the left in each iteration, and the 64 bits of sk _i located in the low order are taken out as the image subkey of the current iteration, thereby realizing the use of different image subkeys for each group to be encrypted, and using different image subkeys through key expansion processing in each iterative process, thereby improving the security and reliability of group encryption.

In this way, the present application generates the final bit group C(n) and the bit group C(n+1) by performing n consecutive iterations on the bit group C(0) and the bit group C(1), that is, continuously determining the state of the bit group at the next moment, thereby improving the security of image encryption. In this application, n=80, that is, 80 iterations, thereby improving the performance of image encryption.

As shown in Table 1, Table 1 is a state transition table of image encryption rules in an image encryption method provided in an embodiment of the present application, wherein They represent the current state of s at time t, the state of the left neighbor of s at time t, the state of the upper left neighbor of s at time t, the state of the upper right neighbor of s at time t, the state of the right neighbor of s at time t, the state of the lower right neighbor of s at time t, the state of the lower left neighbor of s at time t, It means that when the state of s at time t-1 is 0, the state of s at time t+1 is It indicates the state of s at time t+1 when the state of s at time t-1 is 1. Thus, the present application uses this method to implement the iterative process of the image encryption rule for the bit grouping, so as to generate the state of the bit grouping at the following time.

Table 1

As shown in Figure 5, Figure 5 is a full flow chart of image encryption of an image encryption method provided by an embodiment of the present application. In Figure 5, the image to be encrypted is first processed to obtain a channel scrambled array corresponding to the image to be encrypted, and then the channel scrambled array is divided into n 128-bit groups to be encrypted (PB0-PBn) according to 128 bits, and the n 128-bit groups to be encrypted are iteratively processed in turn to obtain n 128-bit encrypted groups (CB0-CBn), and finally the final encrypted image is obtained according to the n 128-bit encrypted groups, so as to realize the encryption of the image, and the encrypted image obtained after encryption by the technical solution of the present application can well protect the image.

In addition, after the present application encrypts the n-2th bit group and the n-1th bit group according to the image encryption rule set to obtain the encrypted image, that is, in the present application, the n-2th bit group and the n-1th bit group corresponding to the multiple groups to be encrypted are encrypted respectively to obtain multiple encrypted groups, and then the encrypted image is obtained according to the multiple encrypted groups. The encrypted image can also be parsed to obtain multiple encrypted groups (i.e., multiple encrypted groups) corresponding to the encrypted image, and thereby obtain the nth bit group and the n+1th bit group under the multiple encrypted groups, and reverse iterate the nth bit group and the n+1th bit group according to the above process to obtain the n-2th bit group and the n-1th bit group under the multiple encrypted groups, and obtain multiple decrypted groups according to the multiple n-2th bit groups and the n-1th bit groups, and restore the image to be encrypted according to the multiple decrypted groups, so as to complete the decryption of the encrypted image.

In an achievable implementation, the decrypted image can be obtained using formula (2), which is specifically embodied as follows:

C ^t-2 = F(C ^t-1 ) ⊕ C ^t Formula (2)

Among them, C ^t-2 represents the current state of the image to be encrypted (here it represents the decrypted image), F represents the image encryption rule in the image encryption rule set (which can be used as the decryption rule this time to realize the reverse iteration process), and C ^t-1 represents the previous state of the group to be decrypted (or here it can represent the next state of the encrypted group), that is, C ^t-1 can be used as the nth bit group and the n+1th bit group.

In summary, in this embodiment, the image to be encrypted and the image encryption rule set are first obtained, and then the image to be encrypted is preprocessed to obtain the red channel array, green channel array and blue channel array corresponding to the image to be encrypted, and the red channel array, green channel array and blue channel array are subjected to channel scrambling processing to obtain the channel scrambled array corresponding to the image to be encrypted, and finally, the channel scrambled array corresponding to the image to be encrypted is encrypted according to the image encryption rule set to obtain the encrypted image.

It can be seen that in the present application, the red channel array, green channel array and blue channel array corresponding to the image to be encrypted are scrambled, that is, the red channel array, green channel array and blue channel array are mixed into a channel scrambled array, and the encryption of the image to be encrypted is implemented using the image encryption rule set. In this way, the method of performing single encryption on the red channel array, green channel array and blue channel array respectively in the related art is avoided. In this way, the present application greatly improves the obfuscation program of image encryption by performing channel scrambling operations and encryption operations of the image encryption rule set, thereby improving the security of image encryption and improving the performance of image encryption and decryption.

In addition, in this application, the nearest neighbor cellular automaton evolution method is used for image encryption based on the image encryption rule set, which can effectively avoid the attack problem in ECB parallel encryption, has good performance for image encryption, and also has a certain decryption efficiency in image decryption. In addition, the nearest neighbor cellular automaton evolution method used in this application has higher randomness than the general two-dimensional cellular automaton, which further improves the encryption performance.

An image encryption device provided in an embodiment of the present application is introduced below. The image encryption device described below and the image encryption method described above can refer to each other.

Referring to FIG. 6 , which is a schematic diagram of the structure of an image encryption device provided in an embodiment of the present application, as shown in FIG. 6 , the image encryption device includes:

An image rule acquisition unit 601 is used to acquire an image to be encrypted and an image encryption rule set, wherein the image encryption rule set is used to encrypt the image to be encrypted;

The image processing unit 602 to be encrypted is used to pre-process the image to be encrypted to obtain a red channel array, a green channel array and a blue channel array corresponding to the image to be encrypted;

A scrambled array obtaining unit 603 is used to perform channel scrambling processing on the red channel array, the green channel array and the blue channel array to obtain a channel scrambled array corresponding to the image to be encrypted;

The encrypted image obtaining unit 604 is used to perform encryption processing on the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set to obtain an encrypted image.

Optionally, the scrambled array obtaining unit 603 is specifically used to:

splicing the first red channel in the red channel array, the first green channel in the green channel array, and the first blue channel in the blue channel array to obtain a first scrambled array;

splicing the second red channel in the red channel array, the second green channel in the green channel array, and the second blue channel in the blue channel array to obtain a second scrambled array;

The first scrambled array and the second scrambled array are concatenated to obtain a channel scrambled array corresponding to the image to be encrypted.

Optionally, the device further comprises:

An image key acquisition unit, used to acquire an image encryption key generated by a random number generator;

A unit for obtaining a group to be encrypted, used for performing group processing on the channel scrambling array to obtain a plurality of groups to be encrypted;

The image subkey obtaining unit is used to obtain a plurality of image subkeys according to the image encryption key and the plurality of groups to be encrypted, wherein the number of the plurality of groups to be encrypted is the same as the number of the plurality of image subkeys.

Optionally, the encrypted image obtaining unit 604 includes:

a to-be-encrypted group division unit, configured to divide the target to-be-encrypted group into an n-2th bit group and an n-1th bit group, wherein n is greater than or equal to 3;

The bit group encryption unit is used to encrypt the n-2th bit group and the n-1th bit group according to the image encryption rule set and the multiple image subkeys to obtain an encrypted image.

Optionally, the device further comprises:

a first image subkey extraction unit, configured to extract an n-2th image subkey corresponding to the n-2th bit group and the n-1th bit group from the plurality of image subkeys;

The bit group encryption unit is specifically used for:

The n-2th bit group and the n-1th bit group are encrypted according to the image encryption rule set and the n-2th image subkey to obtain an encrypted image.

Optionally, the bit group encryption unit is further used for:

Encrypting the n-2th bit group and the n-1th bit group according to the image encryption rule set and the n-2th image subkey to obtain an nth bit group;

Performing expansion processing on the n-2th image subkey to obtain the n-1th image subkey corresponding to the n-1th bit group and the nth bit group;

Encrypting the n-1th bit group and the nth bit group according to the image encryption rule set and the n-1th image subkey to obtain an n+1th bit group;

An encrypted image is obtained according to the nth bit group and the (n+1)th bit group.

Optionally, the device further comprises:

An encrypted image parsing unit, used for parsing the encrypted image to obtain the nth bit group and the n+1th bit group;

a group reverse iteration unit, configured to perform reverse iteration processing on the nth bit group and the n+1th bit group to obtain the n-2th bit group and the n-1th bit group;

The to-be-encrypted image obtaining unit is used to obtain the to-be-encrypted image according to the n-2th bit group and the n-1th bit group.

The image encryption device provided in the embodiment of the present application has the same beneficial effects as the image encryption method provided in the above embodiment, so they are not described in detail.

Electronic device embodiment

Referring to FIG. 7 , this figure is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application, as shown in FIG. 7 , including:

A memory 11, used for storing computer programs;

The processor 12 is used to implement the steps of the image encryption method described in any of the above method embodiments when executing the computer program.

In this embodiment, the device may be a PC (Personal Computer), or may be a terminal device such as a smart phone, a tablet computer, a PDA, or a portable computer.

The device may include a memory 11, a processor 12 and a bus 13. The memory 11 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. The memory 11 may be an internal storage unit of the device in some embodiments, such as a hard disk of the device. The memory 11 may also be an external storage device of the device in other embodiments, such as a plug-in hard disk equipped on the device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Further, the memory 11 may also include both an internal storage unit of the device and an external storage device. The memory 11 may be used not only to store application software and various types of data installed on the device, but also to temporarily store data that has been output or is to be output.

In some embodiments, the processor 12 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor or other data processing chip, and is used to run program codes stored in the memory 11 or process data.

The bus 13 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, FIG7 only uses one thick line, but does not mean that there is only one bus or one type of bus.

Furthermore, the device may also include a network interface 14, which may optionally include a wired interface and/or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the device and other electronic devices.

Optionally, the device may further include a user interface 15, which may include a display (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 15 may also include a standard wired interface and a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch device, etc. The display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the device and to display a visual user interface.

FIG7 only shows a device having components 11-15. Those skilled in the art will appreciate that the structure shown in FIG7 does not constitute a limitation on the device, and may include fewer or more components than shown, or a combination of certain components, or a different arrangement of components.

Readable storage medium embodiment

The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned image encryption method are implemented. The storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

It should also be noted that the "first" and "second" in the names such as "first" and "second" (if any) mentioned in the embodiments of the present application are only used as name identifiers and do not represent the first or second in order.

The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The above is a detailed introduction to an image encryption method, device and related products provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims (10)

1. An image encryption method, comprising:

Acquiring an image to be encrypted and an image encryption rule set, wherein the image encryption rule set is used for encrypting the image to be encrypted;

preprocessing the image to be encrypted to obtain a red channel array, a green channel array and a blue channel array corresponding to the image to be encrypted;

Carrying out channel scrambling on the red channel array, the green channel array and the blue channel array to obtain a channel scrambling array corresponding to the image to be encrypted;

and carrying out encryption processing on the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set to obtain an encrypted image.

2. The method of claim 1, wherein the red channel array comprises a first red channel and a second red channel, the green channel array comprises a first green channel and a second green channel, and the blue channel array comprises a first blue channel and a second blue channel;

The scrambling processing is performed on the red channel array, the green channel array and the blue channel array to obtain a channel scrambling array corresponding to the image to be encrypted, including:

splicing a first red channel in the red channel array, a first green channel in the green channel array and a first blue channel in the blue channel array to obtain a first scrambling array;

Splicing a second red channel in the red channel array, a second green channel in the green channel array and a second blue channel in the blue channel array to obtain a second scrambling array;

And splicing the first scrambling array and the second scrambling array to obtain a channel scrambling array corresponding to the image to be encrypted.

3. The method according to claim 1, further comprising, before said processing the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set, obtaining an encrypted image:

Acquiring an image encryption key generated by a random number generator;

Performing packet processing on the channel scrambling array to obtain a plurality of packets to be encrypted;

And obtaining a plurality of image sub-keys according to the image encryption key and the plurality of packets to be encrypted, wherein the number of the plurality of packets to be encrypted is the same as the number of the plurality of image sub-keys.

4. The method according to claim 3, wherein the plurality of packets to be encrypted includes a target packet to be encrypted, and the processing the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set to obtain an encrypted image includes:

Dividing the target to-be-encrypted packet to obtain an n-2 bit packet and an n-1 bit packet, wherein n is greater than or equal to 3;

And encrypting the n-2 bit packet and the n-1 bit packet according to the image encryption rule set and the plurality of image subkeys to obtain an encrypted image.

5. The method of claim 4, further comprising, prior to said encrypting said n-2 th bit packet and said n-1 th bit packet according to said image encryption rule set and said plurality of image subkeys, obtaining an encrypted image:

extracting an n-2 th image subkey corresponding to the n-2 th bit packet and the n-1 th bit packet from the plurality of image subkeys;

Said encrypting said n-2 th bit packet and said n-1 th bit packet according to said image encryption rule set and said plurality of image subkeys to obtain an encrypted image, comprising:

and encrypting the n-2 bit packet and the n-1 bit packet according to the image encryption rule set and the n-2 image subkey to obtain an encrypted image.

6. The method of claim 5, wherein said encrypting said n-2 th bit packet and said n-1 th bit packet according to said set of image encryption rules and said n-2 th image subkey to obtain an encrypted image comprises:

Encrypting the n-2 bit packet and the n-1 bit packet according to the image encryption rule set and the n-2 image subkey to obtain an n-bit packet;

performing expansion processing on the n-2 th image subkey to obtain an n-1 th image subkey corresponding to the n-1 th bit packet and the n-1 th bit packet;

encrypting the n-1 bit packet and the n-1 bit packet according to the image encryption rule set and the n-1 th image subkey to obtain an n+1 bit packet;

And obtaining an encrypted image according to the nth bit packet and the (n+1) th bit packet.

7. The method according to claim 6, further comprising, after said obtaining an encrypted image from said nth bit packet and said n+1th bit packet:

analyzing the encrypted image to obtain the nth bit packet and the (n+1) th bit packet;

performing reverse iteration processing on the nth bit packet and the n+1th bit packet to obtain the nth-2 bit packet and the nth-1 bit packet;

And obtaining the image to be encrypted according to the n-2 bit group and the n-1 bit group.

8. An image encryption apparatus, comprising:

The image rule acquisition unit is used for acquiring an image to be encrypted and an image encryption rule set, wherein the image encryption rule set is used for encrypting the image to be encrypted;

the image processing unit to be encrypted is used for preprocessing the image to be encrypted to obtain a red channel array, a green channel array and a blue channel array corresponding to the image to be encrypted;

The scrambling array obtaining unit is used for carrying out channel scrambling processing on the red channel array, the green channel array and the blue channel array to obtain a channel scrambling array corresponding to the image to be encrypted;

And the encrypted image obtaining unit is used for carrying out encryption processing on the channel scrambling array corresponding to the image to be encrypted according to the image encryption rule set to obtain an encrypted image.

9. An electronic device, comprising:

A memory for storing a computer program;

a processor for implementing the steps of an image encryption method according to any one of claims 1 to 7 when executing said computer program.

10. A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the steps of an image encryption method according to any one of claims 1 to 7.