CN113343000A - Image encryption method and device based on national cryptographic algorithm, electronic equipment and medium - Google Patents
Image encryption method and device based on national cryptographic algorithm, electronic equipment and medium Download PDFInfo
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Abstract
The application discloses an image encryption method and device based on a cryptographic algorithm, electronic equipment and a medium. In the method, a convolutional neural network model can be utilized to extract the multidimensional characteristic vector of the image to be encrypted, and the multidimensional characteristic vector is used as a retrieval index of the image to be encrypted; encrypting the image to be encrypted to obtain a corresponding encrypted image; carrying out encryption processing on the retrieval index by using a state-secret symmetric block encryption algorithm to obtain a corresponding encryption index; and uploading the encrypted image and the encrypted index to a cloud server. By applying the technical scheme of the application, the SM 9/SM 4 algorithm can be used in the field of encrypted image retrieval. The cloud storage, safe encryption and quick retrieval solution of the image is provided, the limitation of a user storage space is solved, and the data safety, the use efficiency and the sharing capability are improved.
Description
Technical Field
The present application relates to data processing technologies, and in particular, to an image encryption method and apparatus based on a cryptographic algorithm, an electronic device, and a medium.
Background
With the rapid development of cloud computing and cloud storage technologies, more and more enterprises and personal users store and share image data in the cloud through the internet. In one aspect, this flexible image data storage and access mechanism provides a solution for remote access and data sharing in a multi-user operational scenario. The user uploads the image data of the user to the cloud for storage, and other users can access the cloud to view and download images. On the other hand, cloud storage data leakage accidents frequently occur. The images uploaded to the cloud may contain privacy and sensitive information, such as medical images and satellite remote sensing images, and the leakage of the images will have serious consequences, which may result in leakage of user privacy and economic loss. Security of the cloud-stored image becomes especially important.
Further, in order to prevent leakage of cloud storage data, the most effective solution is to encrypt the data and upload the encrypted data to the cloud. At the same time, however, the encryption methods of the prior art make it difficult to retrieve encrypted data, especially encrypted images. Therefore, how to implement a completely new encryption method becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the present application provides an image encryption method, an image encryption device, an electronic device and a medium based on a national cryptographic algorithm, wherein according to an aspect of the embodiment of the present application, the provided image encryption method based on the national cryptographic algorithm is applied to a key generation server, and includes:
generating an encrypted master key pair, wherein the encrypted master key pair is obtained by calculation based on a random number and a public parameter;
generating an encrypted private key, wherein the encrypted private key is obtained by calculation based on a random number, a public parameter and a client identifier;
and respectively sending the encrypted master key pair and the encrypted private key to a client, wherein the client comprises an image client and a search client.
According to an aspect of the embodiments of the present application, an image encryption method based on a cryptographic algorithm is provided, which is applied to an image client, and includes:
extracting a multidimensional characteristic vector of an image to be encrypted by using a convolutional neural network model, and taking the multidimensional characteristic vector as a retrieval index of the image to be encrypted;
encrypting the image to be encrypted to obtain a corresponding encrypted image;
encrypting the retrieval index by using a state symmetric block encryption algorithm to obtain a corresponding encryption index;
and uploading the encrypted image and the encrypted index to a cloud server.
Optionally, in another embodiment based on the foregoing method of the present application, the encrypting the image to be encrypted to obtain a corresponding encrypted image includes:
performing RGB three-channel separation on the image to be encrypted respectively to obtain three corresponding sets of channel data;
respectively encrypting the channel data based on a SM4 symmetric packet encryption algorithm to obtain three groups of corresponding encrypted channel data;
and merging the channels of the three groups of first encrypted channel data to obtain the encrypted image.
Optionally, in another embodiment based on the foregoing method of the present application, the uploading the encryption map and the encryption index to a cloud server includes:
generating image attribute information corresponding to the encrypted image;
uploading the encrypted image and the corresponding image attribute information to a database table of the user;
uploading the encryption graph and the encryption index to the cloud server.
Optionally, in another embodiment based on the foregoing method of the present application, before the extracting, by using a convolutional neural network model, a multidimensional feature vector of an image to be encrypted, the method further includes:
after the encrypted private key is obtained, carrying out key agreement with the search client by using an SM9 identification cryptographic algorithm to obtain a secret key, wherein the secret key is used for encryption and decryption of images and encryption and decryption of indexes.
According to an aspect of the embodiments of the present application, an image encryption method based on a cryptographic algorithm is provided, which is applied to a search client, and includes:
sending a search request for inquiring a target encrypted image to a cloud server, wherein the search request comprises encrypted index information of the target encrypted image;
and receiving the target encrypted image sent by the cloud server.
Optionally, in another embodiment based on the foregoing method of the present application, after receiving the target encrypted image sent by the cloud server, the method further includes:
carrying out RGB three-channel separation on the target encrypted image respectively to obtain three corresponding groups of channel data;
decrypting the three groups of channel data based on an SM4 symmetric grouping algorithm by using an encrypted private key and a client identifier corresponding to the search client to obtain decrypted three groups of channel data;
and merging the channels of the three groups of channel data to obtain a decrypted image to be searched.
Optionally, in another embodiment based on the foregoing method of the present application, before the sending a search request for querying a target encrypted image to a cloud server, the method further includes:
after the encryption private key is obtained, a SM9 identification cryptographic algorithm is used for carrying out key agreement with the image client side to obtain a secret key, and the secret key is used for encryption and decryption of the image and encryption and decryption of the index.
Optionally, in another embodiment based on the foregoing method of the present application, before the sending, to the cloud server, a search request for querying a target encrypted image, the method further includes:
if the plaintext image corresponding to the target encrypted image is determined to be received, extracting a feature vector of the plaintext image;
generating index information based on the feature vector corresponding to the plaintext image;
and matching the index information with the encryption index, and taking the image corresponding to the successfully matched encryption index as the target encryption image.
According to an aspect of the embodiments of the present application, an image encryption method based on a cryptographic algorithm is provided, which is applied to a cloud server, and includes:
receiving a search request which is sent by a search client and used for inquiring a target encrypted image, wherein the search request comprises encrypted index information of the target encrypted image;
obtaining the target encrypted image based on the search request;
and returning the target encrypted image to the search client.
Optionally, in another embodiment based on the foregoing method of the present application, the obtaining the target encrypted image based on the search request includes:
if the search request is determined to include the encryption index information of the target encryption image, obtaining a retrieval condition based on the search request;
traversing the index list, respectively calculating Euclidean distances between each retrieval condition and the encrypted index information, and sequencing the Euclidean distances according to the size relationship to obtain an Euclidean distance set;
selecting encryption indexes corresponding to Euclidean distances in a preset range in the Euclidean distance set as target indexes;
and taking the encrypted image corresponding to the target index as the target encrypted image.
According to another aspect of the embodiments of the present application, there is provided an image encryption system based on a cryptographic algorithm, including:
the system comprises a key generation server, a search client and a server, wherein the key generation server is configured to generate an encrypted master key pair and an encrypted private key and respectively send the encrypted master key pair and the encrypted private key to the clients, and the clients comprise an image client and a search client;
the image client is configured to extract a multi-dimensional feature vector of an image to be encrypted, take the multi-dimensional feature vector as a retrieval index of the image to be encrypted, encrypt the image to be encrypted and the retrieval index, and upload the encrypted image and the encryption index to a cloud server;
the search client is configured to send a search request for inquiring a target encrypted image to a cloud server and receive the target encrypted image sent by the cloud server;
the cloud server is configured to return the target encrypted image to the search client after receiving the search request sent by the search client.
According to another aspect of the embodiments of the present application, there is provided an image encryption apparatus based on a cryptographic algorithm, applied to an image client, including:
the extraction module is configured to extract a multi-dimensional feature vector of an image to be encrypted by using a convolutional neural network model, and the multi-dimensional feature vector is used as a retrieval index of the image to be encrypted;
the generating module is configured to encrypt the image to be encrypted to obtain a corresponding encrypted image;
the encryption module is configured to encrypt the retrieval index by using a state symmetric block encryption algorithm to obtain a corresponding encryption index;
a sending module configured to upload the encrypted image and the encryption index to a cloud server.
According to another aspect of the embodiments of the present application, there is provided an image encryption apparatus based on a cryptographic algorithm, applied to a search client, including:
a query module configured to send a search request for querying a target encrypted image to a cloud server, the search request including encryption index information of the target encrypted image;
a receiving module configured to receive the target encrypted image sent by the cloud server.
According to another aspect of the embodiments of the present application, there is provided an electronic device including:
a memory for storing executable instructions; and
a display for displaying with the memory to execute the executable instructions to perform the operations of any one of the cryptographic algorithm based image encryption methods described above.
According to a further aspect of the embodiments of the present application, there is provided a computer-readable storage medium for storing computer-readable instructions, which when executed, perform the operations of any one of the image encryption methods based on the cryptographic algorithm.
In the method, a convolutional neural network model can be utilized to extract the multidimensional characteristic vector of the image to be encrypted, and the multidimensional characteristic vector is used as a retrieval index of the image to be encrypted; encrypting the image to be encrypted to obtain a corresponding encrypted image; carrying out encryption processing on the retrieval index by using a state-secret symmetric block encryption algorithm to obtain a corresponding encryption index; and uploading the encrypted image and the encrypted index to a cloud server. By applying the technical scheme of the application, the SM 9/SM 4 algorithm can be used in the field of encrypted image retrieval. The cloud storage, safe encryption and quick retrieval solution of the image is provided, the limitation of a user storage space is solved, and the data safety, the use efficiency and the sharing capability are improved.
The technical solution of the present application is further described in detail by the accompanying drawings and examples.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
The present application may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of image encryption based on a cryptographic algorithm according to the present application;
FIG. 2 is a block diagram of an image encryption system architecture for the cryptographic algorithm proposed in the present application;
3-5 are schematic diagrams of still another image encryption based on the cryptographic algorithm proposed in the present application;
6-7 are schematic structural diagrams of the image encryption electronic device based on the cryptographic algorithm proposed in the present application;
fig. 8 is a schematic structural diagram of an electronic device for image encryption based on a cryptographic algorithm according to the present application.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In addition, technical solutions between the various embodiments of the present application may be combined with each other, but it must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should be considered to be absent and not within the protection scope of the present application.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present application are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
An image encryption method for performing a cryptographic algorithm according to an exemplary embodiment of the present application is described below with reference to fig. 1 to 5. It should be noted that the following application scenarios are merely illustrated for the convenience of understanding the spirit and principles of the present application, and the embodiments of the present application are not limited in this respect. Rather, embodiments of the present application may be applied to any scenario where applicable.
The application also provides an image encryption method and device based on the national cryptographic algorithm, a target terminal and a medium.
Fig. 1 schematically shows a flowchart of an image encryption method based on a cryptographic algorithm according to an embodiment of the present application. As shown in fig. 1, the method is applied to a key generation server, and includes:
s101, generating an encryption master key pair, wherein the encryption master key pair is obtained by calculation based on a random number and a public parameter.
S102, generating an encryption private key, wherein the encryption private key is obtained by calculation based on a random number, a public parameter and a client identifier.
S103, the encrypted master key pair and the encrypted private key are respectively sent to the client.
As shown in fig. 2, the present technical solution may include a cloud server (CS, cloud server), an image client (DO, data owner), a search client (SU), and a key generation server (KGC).
Wherein, the cloud server is: the cloud storage space comprises an image storage area and an index storage area, and the cloud computing content comprises image uploading, retrieval, downloading and the like.
The image client is as follows: and the image data owner extracts the features of the uploaded image to construct an index, encrypts the image and the index by using the encryption key and uploads the image and the index to the cloud server.
The search client is as follows: and submitting a search request to the cloud server, acquiring the encrypted image, and decrypting the image by using the encryption key.
The key generation server is: and the trusted third-party server is used for generating a public and private key pair required by client encryption.
Further, the present application may generate, by the key generation server, the corresponding pair of encrypted master keys and the corresponding encrypted private key for the client using the key generation algorithm specified in the SM9 identification algorithm. It should be noted that the number of the encryption private keys may be two, one corresponds to the image client, and the other corresponds to the search client.
Specifically, the key generation server may calculate the corresponding encrypted private key by using the random number, the public parameter, and the client identifier. And respectively sending the encrypted master key pair and the encrypted private key to the image client and the search client.
The key generation server is the server where the trusted authority responsible for selecting the system parameters, generating the master key and generating the user private key is located in the SM9 identification password. And for the SM9algorithm (SM9algorithm) is a country cipher algorithm based on identification. The identification password takes the identification of the user as a public key, and omits the process of exchanging a digital certificate and the public key, so that the security system becomes easy to deploy and manage, and is very suitable for various occasions of end-to-end off-line security communication, cloud data encryption, attribute-based encryption and policy-based encryption.
In the method, a convolutional neural network model can be utilized to extract the multidimensional characteristic vector of the image to be encrypted, and the multidimensional characteristic vector is used as a retrieval index of the image to be encrypted; encrypting the image to be encrypted to obtain a corresponding encrypted image; carrying out encryption processing on the retrieval index by using a state-secret symmetric block encryption algorithm to obtain a corresponding encryption index; and uploading the encrypted image and the encrypted index to a cloud server. By applying the technical scheme of the application, the SM 9/SM 4 algorithm can be used in the field of encrypted image retrieval. The cloud storage, safe encryption and quick retrieval solution of the image is provided, the limitation of a user storage space is solved, and the data safety, the use efficiency and the sharing capability are improved.
Fig. 3 schematically shows a flowchart of an image encryption method based on a cryptographic algorithm according to an embodiment of the present application. As shown in fig. 3, the method is applied to an image client, and includes:
s201, extracting the multidimensional characteristic vector of the image to be encrypted by using the convolutional neural network model, and taking the multidimensional characteristic vector as a retrieval index of the image to be encrypted.
S202, encrypting the image to be encrypted to obtain a corresponding encrypted image.
S203, the retrieval index is encrypted by using a state symmetric block encryption algorithm to obtain a corresponding encryption index.
And S204, uploading the encrypted image and the encrypted index to a cloud server.
Further, the method can be used for extracting the m-dimensional feature vectors of the n images to be encrypted to be uploaded by the image client side by using a deep learning Convolutional Neural Network (CNN) method. And storing the characteristic vectors of the n images to be encrypted into a preset storage area of the device, and using the characteristic vectors as a plaintext retrieval index of the images.
Optionally, in a possible implementation manner of the present application, encrypting an image to be encrypted to obtain a corresponding encrypted image includes:
performing RGB three-channel separation on the image to be encrypted respectively to obtain three corresponding sets of channel data;
respectively encrypting the channel data based on a SM4 symmetric packet encryption algorithm to obtain three corresponding groups of first encrypted channel data;
and carrying out three-channel combination on the three groups of first encryption channel data to obtain an encrypted image.
Furthermore, the method can respectively carry out RGB three-channel separation C on the n images to be encryptedi＝{Ci1，Ci2，Ci31, 2, …, n. So as to split the image into three channels of data. Three-channel data C after splitting imagei1、Ci2、Ci3As input, the image data is encrypted using the KeyGenSm4() function based on the SM4 symmetric block encryption algorithm to obtain encrypted three-channel data ECL＝KeyGenSm4(CL，SKλ)；ECl2＝KeyGenSm4(Cl2，SKλ)；
ECl3＝KeyGenSm4(Cl3，Skλ). Finally, the three channels can be combined after the image is encrypted, and finally the encrypted image { EC ] is obtained1，EC2，…，ECn}。
Optionally, in a possible implementation manner of the present application, uploading the encryption map and the encryption index to a cloud server includes:
generating image attribute information corresponding to the encrypted image;
uploading the encrypted image and the corresponding image attribute information to a database table of the user;
and uploading the encrypted image and the encrypted index to a cloud server.
Optionally, in a possible implementation manner of the present application, before extracting the multidimensional feature vector of the image to be encrypted by using the convolutional neural network model, the method further includes:
after the encrypted private key is obtained, carrying out key agreement with the search client by using an SM9 identification cryptographic algorithm to obtain a secret key, wherein the secret key is used for encryption and decryption of images and encryption and decryption of indexes.
Further, in the present application, after the image client receives the plaintext index, the image client may use the plaintext index as an input, encrypt the index data using the keygen SM4() function of the symmetric block cipher algorithm of the country cipher SM4, and extend and add the obfuscation parameter to obtain the final encrypted index
EIl＝(KeyGerSm4(Il)×Γ+εl)÷Γ，Γ≥2|max(εl) Where Γ is a random number is for each index IiGeneratingThe random error vector of (2). The encryption index is stored in the storage area.
Among them, the symmetric block encryption algorithm of SM4 is a block encryption algorithm defined by GB/T32907.
In addition, the image client can also acquire attribute information of the encrypted image, and upload the attribute information and the database table of the encrypted index image client, and upload the encrypted index after the image is encrypted to the cloud server.
Fig. 4 schematically shows a flowchart of an image encryption method based on a cryptographic algorithm according to an embodiment of the present application. As shown in fig. 4, the method is applied to a search client, and includes:
s301, sending a search request for inquiring the target encrypted image to the cloud server, wherein the search request comprises the encrypted index information of the target encrypted image.
S302, receiving the target encrypted image sent by the cloud server.
Optionally, in a possible implementation manner of the present application, after receiving the target encrypted image sent by the cloud server, the method further includes:
carrying out RGB three-channel separation on the target encrypted image respectively to obtain three corresponding groups of channel data;
decrypting the three groups of channel data based on an SM4 symmetric grouping algorithm by using the encrypted private key and the client identification corresponding to the search client to obtain decrypted three groups of channel data;
and carrying out three-channel combination on the three groups of channel data to obtain the decrypted image to be searched.
Optionally, in a possible implementation manner of the present application, before sending, to the cloud server, a search request for querying a target encrypted image, the method further includes:
after the encryption private key is obtained, a SM9 identification cryptographic algorithm is used for carrying out key agreement with the image client side to obtain a secret key, and the secret key is used for encryption and decryption of the image and encryption and decryption of the index.
Optionally, in a possible implementation manner of the present application, before sending, to the cloud server, a search request for querying a target encrypted image, the method further includes:
if the fact that the plaintext image corresponding to the target encrypted image is received is determined, extracting a feature vector of the plaintext image;
generating index information based on the feature vector corresponding to the plaintext image;
and matching the index information with the encryption index, and taking the image corresponding to the successfully matched encryption index as a target encryption image.
In one way, the way for searching the images by the search client can be to perform image search by using plaintext images (i.e., to search images). Specifically, for searching the image by using the image, the search client may generate an index according to the feature vector of the extracted search image, match the index information with the encryption index stored in the cloud server, and use the image corresponding to the encryption index successfully matched as the target encryption image.
Fig. 5 schematically shows a flowchart of an image encryption method based on a cryptographic algorithm according to an embodiment of the present application. As shown in fig. 5, the method is applied to a cloud server, and includes:
s401, receiving a search request which is sent by a search client and used for inquiring a target encrypted image, wherein the search request comprises encrypted index information of the target encrypted image;
s402, obtaining the target encrypted image based on the search request;
and S403, returning the target encrypted image to the search client.
Optionally, in a possible implementation manner of the present application, the obtaining the target encrypted image based on the search request includes:
and if the search request is determined to include the encryption index information of the target encryption image, obtaining a retrieval condition based on the search request.
And traversing the index list, respectively calculating the Euclidean distances between each retrieval condition and the encrypted index information, and sequencing the Euclidean distances according to the size relationship to obtain an Euclidean distance set.
And selecting the encryption indexes corresponding to the Euclidean distances sequenced in a preset range from the Euclidean distance set as target indexes.
And taking the encrypted image corresponding to the target index as a target encrypted image.
Optionally, in a possible implementation manner of the present application, obtaining the target encrypted image based on the search request includes:
if the search request is determined to include the encryption index information of the target encryption image, obtaining a retrieval condition based on the search request;
traversing the index list, respectively calculating Euclidean distances between each retrieval condition and the encrypted index information, and sequencing the Euclidean distances according to the size relationship to obtain an Euclidean distance set;
selecting encryption indexes corresponding to Euclidean distances in a preset range in the Euclidean distance set as target indexes;
and taking the encrypted image corresponding to the target index as a target encrypted image.
The method for requesting the cloud server to search for the image by the search client may be to search for the image by using an encrypted index. Specifically, for encrypted index search, after the cloud server receives a search request, the cloud server may read the search request to obtain a search condition EQ, execute an image search ImSearch () function, and look up the table sm _ encryption _ image _ index to obtain an encrypted index { EI {1，EI2，…，EIn}. Then, the EI is calculated by traversing the index listi(i ═ 1, 2, …, n) and EQ:
Furthermore, in the embodiment of the present application, an encrypted index corresponding to the euclidean distance sorted in the preset range may be selected from the set of euclidean distances as the target index, and an encrypted image corresponding to the target index may be used as the target encrypted image. The preset range can be the first 3 with the minimum sequencing range, or the first five with the minimum sequencing range, and the like.
The application discloses an image encryption method and device based on a cryptographic algorithm, electronic equipment and a medium. In the method, a convolutional neural network model can be utilized to extract the multidimensional characteristic vector of the image to be encrypted, and the multidimensional characteristic vector is used as a retrieval index of the image to be encrypted; encrypting the image to be encrypted to obtain a corresponding encrypted image; carrying out encryption processing on the retrieval index by using a state-secret symmetric block encryption algorithm to obtain a corresponding encryption index; and uploading the encrypted image and the encrypted index to a cloud server. By applying the technical scheme of the application, the SM 9/SM 4 algorithm can be used in the field of encrypted image retrieval. The cloud storage, safe encryption and quick retrieval solution of the image is provided, the limitation of a user storage space is solved, and the data safety, the use efficiency and the sharing capability are improved.
Optionally, the present application further includes an image encryption system based on a cryptographic algorithm, which may include the following components:
the system comprises a key generation server, a search client and a server, wherein the key generation server is configured to generate an encrypted master key pair and an encrypted private key and respectively send the encrypted master key pair and the encrypted private key to the clients, and the clients comprise an image client and a search client;
the image client is configured to extract a multi-dimensional feature vector of an image to be encrypted, take the multi-dimensional feature vector as a retrieval index of the image to be encrypted, encrypt the image to be encrypted and the retrieval index, and upload the encrypted image and the encryption index to a cloud server;
the search client is configured to send a search request for inquiring a target encrypted image to a cloud server and receive the target encrypted image sent by the cloud server;
the cloud server is configured to return the target encrypted image to the search client after receiving the search request sent by the search client.
Further, in the image encryption system of the present application, the key generation server, the image client, the search client, and the cloud server may be comprised of the following steps:
step 1: and the key generation server generates a required public and private key pair of the image client and the search client respectively. Step 2: the image client and the search client negotiate a secret key according to a preset encryption algorithm (e.g., SM9 key exchange protocol). And step 3: and the image client extracts the image characteristic vector and establishes a retrieval index. And 4, step 4: the image client encrypts the image and index using an encryption algorithm, such as the cryptographic SM4 encryption algorithm. And 5: and the image client uploads the encrypted image and the encrypted index to the cloud server. Step 6: and the search client searches in the cloud server to obtain a search result. And 7: and the searching client decrypts the encrypted image obtained by searching.
Specifically, the key generation server generates a corresponding pair of encryption master keys and an encryption private key corresponding to the client by using a key generation algorithm specified in the SM9 identification algorithm. It should be noted that the number of the encryption private keys may be two, one corresponds to the image client, and the other corresponds to the search client.
In addition, for the image client, an m-dimensional feature vector of n images to be encrypted to be uploaded may be extracted by the image client using a deep learning Convolutional Neural Network (CNN) method. And storing the characteristic vectors of the n images to be encrypted into a preset storage area of the device, and using the characteristic vectors as a plaintext retrieval index of the images. Furthermore, RGB three-channel separation can be performed on the image to be encrypted respectively to obtain three corresponding sets of channel data, encryption processing is performed on each channel data respectively based on a SM4 symmetric grouping encryption algorithm to obtain three corresponding sets of first encrypted channel data, and finally three channels of the three sets of first encrypted channel data are combined to obtain the encrypted image.
Furthermore, for the search client, the RGB three-channel separation may be performed on the target encrypted image, so as to obtain three corresponding sets of channel data, and then the SM 4-based symmetric grouping algorithm is performed on the three sets of channel data to decrypt the three sets of channel data by using the encryption private key and the client identifier corresponding to the search client, so as to obtain three decrypted sets of channel data, so that the three sets of channel data are subjected to three-channel combination, so as to obtain a decrypted image to be searched.
Finally, for the cloud server, if it is determined that the search request includes the encrypted index information of the target encrypted image, based on the search request, after the search condition is obtained, traversing the index list, respectively calculating the euclidean distances between each search condition and the encrypted index information, and sequentially sorting the euclidean distances according to the size relationship to obtain a set of euclidean distances, so that the encrypted indexes corresponding to the euclidean distances sorted in the preset range can be selected in the set of euclidean distances in the following process as the target indexes, and the encrypted images corresponding to the target indexes are taken as the target encrypted images.
Optionally, in another embodiment of the present application, as shown in fig. 6, the present application further provides an image encryption apparatus based on a cryptographic algorithm. The method is applied to an image client, and comprises an extraction module 501, a generation module 502, an encryption module 503, and a sending module 504, wherein:
an extracting module 501, configured to extract a multidimensional feature vector of an image to be encrypted by using a convolutional neural network model, and use the multidimensional feature vector as a retrieval index of the image to be encrypted;
a generating module 502 configured to encrypt the image to be encrypted to obtain a corresponding encrypted image;
the encryption module 503 is configured to encrypt the search index by using a cryptographic symmetric block encryption algorithm to obtain a corresponding encryption index;
a sending module 504 configured to upload the encrypted image and the encrypted index to a cloud server.
Optionally, in another embodiment of the present application, as shown in fig. 7, the present application further provides an image encryption apparatus based on a cryptographic algorithm. The method is applied to a search client, and comprises a query module 505 and a receiving module 506, wherein:
a query module 505 configured to send a search request for querying a target encrypted image to a cloud server, the search request including encryption index information of the target encrypted image;
a receiving module 506 configured to receive the target encrypted image sent by the cloud server.
In the method, a convolutional neural network model can be utilized to extract the multidimensional characteristic vector of the image to be encrypted, and the multidimensional characteristic vector is used as a retrieval index of the image to be encrypted; encrypting the image to be encrypted to obtain a corresponding encrypted image; carrying out encryption processing on the retrieval index by using a state-secret symmetric block encryption algorithm to obtain a corresponding encryption index; and uploading the encrypted image and the encrypted index to a cloud server. By applying the technical scheme of the application, the SM 9/SM 4 algorithm can be used in the field of encrypted image retrieval. The cloud storage, safe encryption and quick retrieval solution of the image is provided, the limitation of a user storage space is solved, and the data safety, the use efficiency and the sharing capability are improved.
In another embodiment of the present application, the query module 505 further includes:
the query module 505 is configured to perform RGB three-channel separation on the target encrypted image, so as to obtain three corresponding sets of channel data;
the query module 505 is configured to decrypt the three sets of channel data based on an SM4 symmetric grouping algorithm by using an encrypted private key and a client identifier corresponding to the search client, so as to obtain decrypted three sets of channel data;
and the query module 505 is configured to perform three-channel combination on the three sets of channel data to obtain a decrypted image to be searched.
In another embodiment of the present application, the query module 505 further includes:
and the query module 505 is configured to perform key agreement with the image client by using the SM9 identifier cryptographic algorithm after obtaining the encrypted private key, so as to obtain a secret key, where the secret key is used for encryption and decryption of the image and encryption and decryption of the index.
In another embodiment of the present application, the query module 505 further includes:
the query module 505 is configured to extract a feature vector of the plaintext image if it is determined that the plaintext image corresponding to the target encrypted image is received;
a query module 505 configured to generate index information based on the feature vector corresponding to the plaintext image;
and the query module 505 is configured to match the index information with the encryption index, and take an image corresponding to the successfully matched encryption index as the target encryption image.
FIG. 8 is a block diagram illustrating a logical structure of an electronic device in accordance with an exemplary embodiment. For example, the electronic device 600 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
In an exemplary embodiment, there is also provided a non-transitory computer readable storage medium, such as a memory, including instructions executable by an electronic device processor to perform the above-described cryptographic algorithm-based image encryption method, the method comprising: sending a search request for inquiring a target encrypted image to a cloud server, wherein the search request comprises encrypted index information of the target encrypted image; and receiving the target encrypted image sent by the cloud server. Optionally, the instructions may also be executable by a processor of the electronic device to perform other steps involved in the exemplary embodiments described above. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
In an exemplary embodiment, there is also provided an application/computer program product including one or more instructions executable by a processor of an electronic device to perform the above-described cryptographic algorithm-based image encryption method, the method including: sending a search request for inquiring a target encrypted image to a cloud server, wherein the search request comprises encrypted index information of the target encrypted image; and receiving the target encrypted image sent by the cloud server. Optionally, the instructions may also be executable by a processor of the electronic device to perform other steps involved in the exemplary embodiments described above.
Fig. 8 is an exemplary diagram of the computer device 60. Those skilled in the art will appreciate that the schematic diagram 8 is merely an example of a computer device 60 and is not intended to limit the computer device 60 and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the computer device 60 may also include input output devices, network access devices, buses, etc.
The Processor 602 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor 602 may be any conventional processor or the like, the processor 602 being the control center for the computer device 60 and connected to the various parts of the overall computer device 60 by various interfaces and lines.
The modules integrated by the computer device 60 may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by hardware related to computer readable instructions, which may be stored in a computer readable storage medium, and when the computer readable instructions are executed by a processor, the steps of the method embodiments may be implemented.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (16)
1. An image encryption method based on a cryptographic algorithm is applied to a key generation server, and comprises the following steps:
generating an encrypted master key pair, wherein the encrypted master key pair is obtained by calculation based on a random number and a public parameter;
generating an encrypted private key, wherein the encrypted private key is obtained by calculation based on a random number, a public parameter and a client identifier;
and respectively sending the encrypted master key pair and the encrypted private key to a client, wherein the client comprises an image client and a search client.
2. An image encryption method based on a cryptographic algorithm is applied to an image client, and comprises the following steps:
extracting a multidimensional characteristic vector of an image to be encrypted by using a convolutional neural network model, and taking the multidimensional characteristic vector as a retrieval index of the image to be encrypted;
encrypting the image to be encrypted to obtain a corresponding encrypted image;
encrypting the retrieval index by using a state symmetric block encryption algorithm to obtain a corresponding encryption index;
and uploading the encrypted image and the encrypted index to a cloud server.
3. The method according to claim 2, wherein the encrypting the image to be encrypted to obtain a corresponding encrypted image comprises:
performing RGB three-channel separation on the image to be encrypted respectively to obtain three corresponding sets of channel data;
respectively encrypting the channel data based on a SM4 symmetric packet encryption algorithm to obtain three groups of corresponding encrypted channel data;
and carrying out three-channel combination on the three groups of encrypted channel data to obtain the encrypted image.
4. The method of claim 2, wherein uploading the encryption map and the encryption index to a cloud server comprises:
generating image attribute information corresponding to the encrypted image;
uploading the encrypted image and the corresponding image attribute information to a database table of the user;
uploading the encrypted image and the encrypted index to the cloud server.
5. The method according to claim 2, wherein before extracting the multi-dimensional feature vector of the image to be encrypted by using the convolutional neural network model, the method further comprises:
after the encrypted private key is obtained, carrying out key agreement with the search client by using an SM9 identification cryptographic algorithm to obtain a secret key, wherein the secret key is used for encryption and decryption of images and encryption and decryption of indexes.
6. An image encryption method based on a cryptographic algorithm is applied to a search client, and comprises the following steps:
sending a search request for inquiring a target encrypted image to a cloud server, wherein the search request comprises encrypted index information of the target encrypted image;
and receiving the target encrypted image sent by the cloud server.
7. The method according to claim 6, wherein after receiving the target encrypted image sent by the cloud server, the method further comprises:
carrying out RGB three-channel separation on the target encrypted image respectively to obtain three corresponding groups of channel data;
decrypting the three groups of channel data based on an SM4 symmetric grouping algorithm by using an encrypted private key and a client identifier corresponding to the search client to obtain decrypted three groups of channel data;
and carrying out three-channel combination on the three groups of channel data to obtain the decrypted image to be searched.
8. The method of claim 6, wherein before sending the search request for querying the target encrypted image to the cloud server, further comprising:
after the encryption private key is obtained, a SM9 identification cryptographic algorithm is used for carrying out key agreement with the image client side to obtain a secret key, and the secret key is used for encryption and decryption of the image and encryption and decryption of the index.
9. The method according to claim 6, wherein before the sending of the search request for querying the target encrypted image to the cloud server, further comprising:
if the plaintext image corresponding to the target encrypted image is determined to be received, extracting a feature vector of the plaintext image;
generating index information based on the feature vector corresponding to the plaintext image;
and matching the index information with the encryption index, and taking the image corresponding to the successfully matched encryption index as the target encryption image.
10. An image encryption method based on a national cryptographic algorithm is applied to a cloud server, and comprises the following steps:
receiving a search request which is sent by a search client and used for inquiring a target encrypted image, wherein the search request comprises encrypted index information of the target encrypted image;
obtaining the target encrypted image based on the search request;
and returning the target encrypted image to the search client.
11. The method of claim 10, wherein obtaining the target encrypted image based on the search request comprises:
if the search request is determined to include the encryption index information of the target encryption image, obtaining a retrieval condition based on the search request;
traversing the index list, respectively calculating Euclidean distances between each retrieval condition and the encrypted index information, and sequencing the Euclidean distances according to the size relationship to obtain an Euclidean distance set;
selecting encryption indexes corresponding to Euclidean distances in a preset range in the Euclidean distance set as target indexes;
and taking the encrypted image corresponding to the target index as the target encrypted image.
12. An image encryption system based on a cryptographic algorithm, comprising:
the system comprises a key generation server, a search client and a server, wherein the key generation server is configured to generate an encrypted master key pair and an encrypted private key and respectively send the encrypted master key pair and the encrypted private key to the clients, and the clients comprise an image client and a search client;
the image client is configured to extract a multi-dimensional feature vector of an image to be encrypted, take the multi-dimensional feature vector as a retrieval index of the image to be encrypted, encrypt the image to be encrypted and the retrieval index, and upload the encrypted image and the encryption index to a cloud server;
the search client is configured to send a search request for inquiring a target encrypted image to a cloud server and receive the target encrypted image sent by the cloud server;
the cloud server is configured to return the target encrypted image to the search client after receiving the search request sent by the search client.
13. An image encryption device based on a cryptographic algorithm is applied to an image client, and comprises:
the extraction module is configured to extract a multi-dimensional feature vector of an image to be encrypted by using a convolutional neural network model, and the multi-dimensional feature vector is used as a retrieval index of the image to be encrypted;
the generating module is configured to encrypt the image to be encrypted to obtain a corresponding encrypted image;
the encryption module is configured to encrypt the retrieval index by using a state symmetric block encryption algorithm to obtain a corresponding encryption index;
a sending module configured to upload the encrypted image and the encryption index to a cloud server.
14. An image encryption device based on a cryptographic algorithm is applied to a search client, and comprises:
a query module configured to send a search request for querying a target encrypted image to a cloud server, the search request including encryption index information of the target encrypted image;
a receiving module configured to receive the target encrypted image sent by the cloud server.
15. An electronic device, comprising:
a memory for storing executable instructions; and the number of the first and second groups,
a processor for display with the memory to execute the executable instructions to perform the operations of the cryptographic algorithm based image encryption method of any one of claims 1-11.
16. A computer-readable storage medium storing computer-readable instructions that, when executed, perform the operations of the cryptographic algorithm-based image encryption method of any one of claims 1-11.
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