CN115484353A - Processing method, electronic device and storage medium applicable to watermarked pictures - Google Patents

Abstract

The invention provides a processing method, a device, electronic equipment and a storage medium suitable for a watermark picture, wherein the method comprises the following steps: the back-end server encrypts the original image by adopting a symmetric key and encrypts the symmetric key by adopting an asymmetric key; sending the encrypted original image, the encrypted symmetric key, the encrypted watermark text information and the identification information of the original image to a front-end server so that the front-end server adds a watermark to the decrypted original image according to the watermark text information; the watermark text information is information required by adding the watermark in the process of accessing the original image by the front-end server. According to the processing method, device, electronic equipment and storage medium suitable for the watermark picture, the original picture is safely transmitted based on the asymmetric key and the symmetric key, and the front-end server performs watermark adding on the original picture, so that illegal personnel are prevented from acquiring picture information through packet capture, the safety of data processing is improved, the traceable watermark information is quickly realized, and the processing pressure at the back end is reduced.

Description

Processing method, electronic device and storage medium applicable to watermarked pictures

technical field

The invention relates to the technical field of information processing, in particular to a processing method suitable for watermark pictures, electronic equipment and storage media.

Background technique

In the multimedia conference system, it is usually necessary to provide participants with the annotation function of material pictures to meet the feedback and recording needs of the participants on the meeting process information. At the same time, in order to ensure the confidentiality and security of the meeting shared materials, it is often necessary Add the watermark information corresponding to the previewer to the picture to limit the spread of the material and ensure the traceability of the leaked information, so that the leaker can be traced through the watermark information in the picture. At present, in the watermark and annotation processing in the multimedia conference system based on the front-end and back-end separation technology, the disadvantage of the back-end watermark/annotation method is that the amount of data processing is large, and it takes a long time, which cannot meet the effect of instant sharing and preview of files and pictures. In addition, it takes up a lot of storage space, and at the same time, it adopts the processing method of adding annotations and recombining on the basis of the previous composite image, and the annotation information of historical editing cannot be removed; the disadvantage of adding watermark/annotation at the front end is that there is data Security risk. The backend directly transmits the original image without watermark processing to the frontend through the network. Unscrupulous personnel can analyze the data through packet capture to obtain the original image, resulting in data leakage, and cannot trace the source of the leaked information.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a processing method, electronic equipment and storage medium suitable for watermark pictures.

In a first aspect, the present invention provides a processing method suitable for watermark pictures, including:

The backend server encrypts the original image with a symmetric key, and encrypts the symmetric key with an asymmetric key;

Send the encrypted original image, encrypted symmetric key, watermark text information, and identification information of the original image to the front-end server, so that the front-end server adds a watermark to the decrypted original image according to the watermark text information ; Wherein, the watermark text information is the information required for the front-end server to add a watermark during the process of accessing the original image.

In one embodiment, the encrypting the symmetric key with an asymmetric key includes:

The symmetric key is encrypted using a private key in the asymmetric key.

In one embodiment, the method also includes:

receiving a request sent by the front-end server, where the request includes identification information of the original image;

Obtain the public key in the asymmetric key according to the identification information of the original image, and send the public key to the front-end server, so that the front-end server pairs the encrypted symmetric key according to the public key Decrypt to obtain the symmetric key, and decrypt the encrypted original image according to the symmetric key to obtain the original image.

In a second aspect, the present invention provides a processing method suitable for watermark pictures, including:

The front-end server receives the encrypted original image sent by the back-end server, the encrypted symmetric key and watermark text information, and the identification information of the original image; wherein, the back-end server uses the symmetric key to encrypt the original image, and encrypting the symmetric key with an asymmetric key;

Adding a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is information required for adding a watermark when the front-end server accesses the original image.

In one embodiment, the back-end server encrypts the symmetric key with a private key in the asymmetric key, and correspondingly, the method adds the watermark to the decrypted original image according to the watermark text information , which also includes decrypting the encrypted original image, including:

Sending a request to the back-end server, the request including the identification information of the original image, so that the back-end server obtains the public key in the asymmetric key according to the identification information of the original image, and the The public key is sent to the front-end server;

Decrypt the encrypted symmetric key according to the public key to obtain the symmetric key, and decrypt the encrypted original image according to the symmetric key to obtain the original image.

In one embodiment, adding a watermark to the decrypted original image according to the watermark text information includes:

Set the decrypted original image as the bottom layer, as the original image layer;

The watermark text information is added to a transparent canvas to generate a watermark layer with the same size as the original image, and the watermark layer and the original image layer are superimposed and displayed.

In one embodiment, the method also includes:

Add the configured annotation data to the transparent canvas to generate an annotation layer of the same size as the original image;

The annotation layer is placed on the top layer, the watermark layer is placed on the middle layer, and the original image layer is placed on the bottom layer.

In one embodiment, the method also includes:

After determining the trigger information for the user to visit the original image again, request the annotation layer according to the user ID and the original image ID information, determine the existence of the annotation layer, and arrange the original image layer, watermark layer, and annotation layer from bottom to top Display overlay.

In a third aspect, the present invention provides an electronic device, including a memory and a memory storing a computer program, and when the processor executes the program, the steps of the processing method applicable to watermarked pictures described in the first aspect or the second aspect are realized .

In a fourth aspect, the present invention provides a processor-readable storage medium, the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to perform the process described in the first aspect or the second aspect. Steps of a processing method applicable to watermarked pictures.

The processing method, device, electronic equipment, and storage medium suitable for watermarked pictures provided by the present invention can securely transmit the original picture based on the asymmetric key and the symmetric key, and add the watermark to the original picture by the front-end server to avoid illegal personnel Obtaining picture information by capturing packets improves the security of data processing, and at the same time provides fast implementation of traceable watermark information, reducing back-end processing pressure.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 is a schematic flow chart of a processing method suitable for watermark pictures provided by the present invention;

Fig. 2 is a schematic flow chart of a processing method suitable for watermark pictures provided by the present invention;

Fig. 3 is a schematic structural diagram of a processing device suitable for watermark pictures provided by the present invention;

Fig. 4 is a schematic structural diagram of a processing device suitable for watermark pictures provided by the present invention;

Fig. 5 is a schematic structural diagram of an electronic device provided by the present invention;

detailed description

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The processing method, device, electronic equipment and storage medium applicable to watermark pictures of the present invention will be described below with reference to FIGS. 1-5 .

Fig. 1 shows a schematic flow chart of a processing method suitable for a watermark image in the present invention, referring to Fig. 1, the method includes:

11. The back-end server uses a symmetric key to encrypt the original image, and uses an asymmetric key to encrypt the symmetric key;

12. Send the encrypted original image, encrypted symmetric key, watermark text information, and identification information of the original image to the front-end server, so that the front-end server adds a watermark to the decrypted original image according to the watermark text information; wherein, the watermark The text information is the information required for adding watermarks in the process of accessing the original image by the front-end server.

With respect to step 11 and step 12, it should be noted that in the present invention, the backend server is a server that provides original pictures to participants or users who access pictures. The front-end server is a device for viewing pictures or annotating pictures for participants or users who access pictures.

When the back-end server sends the original image to the front-end server, it first encrypts the original image with a symmetric key. The symmetric key used is concatenated from the identification information of the original image (such as the id of the image stored in the database), the user ID of the accessing user, and the time stamp information of the access interface. The symmetric key is used to encrypt the original image to obtain the encrypted original image.

In order to avoid the information security problems caused by unauthorized operation and theft of decrypting the original image, the back-end server also uses an asymmetric key to encrypt the above-mentioned symmetric key for encrypting the original image to obtain the encrypted symmetric key. When decrypting the original image later, the encrypted symmetric key must first be decrypted to obtain the symmetric key.

In the present invention, the watermark text information is the information required for adding watermark during the process of the front-end server accessing the original image. That is, if the visiting user uses the front-end server to access the original image, a watermark needs to be added to the original image to indicate that the visiting user has used the original image. Therefore, the watermark text information is actually a sign representing the access user to use the original image.

In the present invention, the back-end server sends the encrypted original image, encrypted symmetric key, watermark text information, and identification information of the original image to the front-end server.

After receiving the encrypted original image, the front-end server wants to record the traces of the access user's use of the original image, so as to facilitate subsequent file tracking. To this end, the front-end server needs to combine the encrypted original image, the encrypted symmetric key, the watermark text information, and the relationship between the identification information of the original image to decrypt the encrypted original image to obtain the original image. Then add a watermark to the decrypted original image according to the watermark text information.

The processing method suitable for watermarked pictures provided by the present invention uses the back-end server to securely transmit the original picture based on the asymmetric key and the symmetric key, and the front-end server to add the watermark to the original picture, so as to prevent illegal personnel from obtaining pictures by capturing packets information, which improves the security of data processing, and at the same time provides rapid implementation of traceable watermark information, reducing the pressure on back-end processing.

In the further description, the processing process of the back-end server is explained mainly during the process of the front-end server obtaining the decryption symmetric key, as follows:

In the present invention, the backend server needs to use an asymmetric key to encrypt the symmetric key used to encrypt the original image, and the asymmetric key includes a private key and a public key.

In the present invention, the backend server uses the private key in the asymmetric key to encrypt the symmetric key to obtain the encrypted symmetric key.

The back-end server receives the request sent by the front-end server, and the request includes the identification information of the original image.

Since the corresponding relationship between the identification information of the original image and the asymmetric key (public key and private key) is set in the back-end server, the back-end server can obtain the asymmetric keys according to the identification information of the original image and the stored corresponding relationship. The public key in the key, and then send the public key to the front-end server.

The front-end server can decrypt the encrypted symmetric key according to the public key to obtain the symmetric key, and then decrypt the encrypted original image according to the symmetric key to obtain the original image.

In the further method of the present invention, the front-end server requests the back-end server to obtain the public key, uses the public key to decrypt the encrypted symmetric key, and then decrypts the encrypted original image to obtain the original image, ensuring the security of the original image.

Fig. 2 shows a schematic flow chart of a processing method suitable for watermark pictures according to the present invention. Referring to Fig. 2, the method includes:

21. The front-end server receives the encrypted original image, the encrypted symmetric key, watermark text information, and the identification information of the original image sent by the back-end server; wherein, the back-end server uses a symmetric key to encrypt the original image, and uses non- Symmetric key to symmetric key encryption;

22. Adding a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is information required for adding a watermark when the front-end server accesses the original image.

Regarding steps 21 and 22, it should be noted that in the present invention, the relevant front-end server receives the encrypted original image, encrypted symmetric key, watermark text information, and identification information of the original image sent by the back-end server, and then The subsequent process of adding a watermark to the decrypted original image is described in detail in the method of the above embodiment, and will be described in detail here.

The processing method suitable for watermarked pictures provided by the present invention uses the back-end server to securely transmit the original picture based on the asymmetric key and the symmetric key, and the front-end server to add the watermark to the original picture, so as to prevent illegal personnel from obtaining pictures by capturing packets information, which improves the security of data processing, and at the same time provides rapid implementation of traceable watermark information, reducing the pressure on back-end processing.

In the further explanation, it is mainly to explain the process of decrypting the encrypted original image by the front-end server, as follows:

In the present invention, the backend server uses the private key in the asymmetric key to encrypt the symmetric key.

The front-end server sends a request to the back-end server, and the request includes the identification information of the original image, so that the back-end server obtains the public key in the asymmetric key according to the identification information of the original image, and sends the public key to the front-end server;

The encrypted symmetric key is decrypted according to the public key to obtain the symmetric key, and the encrypted original image is decrypted according to the symmetric key to obtain the original image.

The above-mentioned process is described in detail in the method of the above-mentioned embodiment, and will not be repeated here.

In the further method of the present invention, the front-end server requests the back-end server to obtain the public key, uses the public key to decrypt the encrypted symmetric key, and then decrypts the encrypted original image to obtain the original image, ensuring the security of the original image.

In the further explanation, it is mainly to explain the process of adding watermark to the decrypted original image according to the watermark text information, as follows:

Set the decrypted original image as the bottom layer, as the original image layer;

Add the watermark text information to the transparent canvas, generate a watermark layer with the same size as the original image, and superimpose the watermark layer and the original image layer for display.

Regarding this, it should be noted that in the present invention, after the original image is decrypted, it is set as the bottommost layer as the original image layer. Then draw the watermark text information of the visiting user on the transparent canvas to generate a watermark layer with the same size as the original image, and the watermark layer and the original image layer are superimposed and displayed.

In the further explanation, it is mainly to explain the process of annotating in the original image, as follows:

Add the configured annotation data to the transparent canvas to generate an annotation layer of the same size as the original image;

The annotation layer is placed on the top layer, the watermark layer is placed on the middle layer, and the original image layer is placed on the bottom layer for display.

Since the annotation layer is on the top layer, the user's annotation operation can be edited separately without affecting the original image layer and watermark layer, which can satisfy the user's editing and processing of historical annotation information, and conveniently save the annotation data to the back-end server separately. Reduce storage requirements.

In the further explanation, it is mainly to explain the processing process when the accessing user uses the original image again, as follows:

After determining the trigger information for the user to visit the original image again, request the annotation layer according to the user ID and the original image ID information, determine the existence of the annotation layer, and superimpose the original image layer, watermark layer, and annotation layer from bottom to top show.

In this regard, it should be noted that in the present invention, by storing the annotation layer, it is convenient for subsequent direct invocation and retrieval, and there is no need to re-execute the annotation operation, which improves the convenience of using the file.

The processing device suitable for watermark pictures provided by the present invention is described below, and the processing device suitable for watermark pictures described below and the processing method suitable for watermark pictures described above can be referred to in correspondence.

Fig. 3 shows a schematic structural diagram of a processing device suitable for watermark pictures provided by the present invention, referring to Fig. 3, the device includes an encryption module 31 and a sending module 32, wherein:

An encryption module 31, configured to encrypt the original image with a symmetric key, and encrypt the symmetric key with an asymmetric key;

The sending module 32 is used to send the encrypted original image, the encrypted symmetric key, watermark text information, and the identification information of the original image to the front-end server, so that the front-end server adds a watermark to the decrypted original image according to the watermark text information ; Among them, the watermark text information is the information required for adding watermark in the process of the front-end server accessing the original image.

In a further description, during the process of encrypting the symmetric key with an asymmetric key, the encryption module is specifically used for:

The symmetric key is encrypted using a private key in the asymmetric key.

In a further description, the device also includes a first receiving module, configured to:

receiving the request sent by the front-end server, the request includes the identification information of the original image;

Obtain the public key in the asymmetric key according to the identification information of the original image, and send the public key to the front-end server, so that the front-end server can decrypt the encrypted symmetric key according to the public key to obtain the symmetric key, and then decrypt the encrypted symmetric key according to the symmetric key. The key is used to decrypt the encrypted original image to obtain the original image.

Since the principle of the apparatus described in the embodiment of the present invention is the same as that of the method described in the foregoing embodiments, more detailed explanations will not be repeated here.

It should be noted that, in the embodiment of the present invention, a hardware processor (hardware processor) may be used to implement related functional modules.

The processing device suitable for watermarked pictures provided by the present invention securely transmits the original picture based on the asymmetric key and the symmetric key, and adds the watermark to the original picture by the front-end server, so as to prevent illegal personnel from obtaining picture information by capturing packets, and improve It not only improves the security of data processing, but also provides rapid implementation of traceable watermark information, reducing the pressure of back-end processing.

FIG. 4 shows a schematic structural diagram of a processing device suitable for watermark pictures provided by the present invention. Referring to FIG. 4, the device includes a second receiving module 41 and an adding module 42, wherein:

The second receiving module 41 is used to receive the encrypted original image sent by the backend server, the encrypted symmetric key and watermark text information, and the identification information of the original image; wherein, the backend server uses the symmetric key to encrypt the original image , and use an asymmetric key to encrypt the symmetric key;

The adding module 42 is configured to add a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is the information required for adding a watermark when the front-end server accesses the original image.

In a further description, the backend server uses the private key in the asymmetric key to encrypt the symmetric key. Correspondingly, the device further includes a decryption module for decrypting the decrypted original data according to the watermark text information. Before adding a watermark to the image, the encrypted original image is decrypted, specifically for:

Sending a request to the back-end server, the request includes the identification information of the original image, so that the back-end server obtains the public key in the asymmetric key according to the identification information of the original image, and sends the public key to the front-end server;

The encrypted symmetric key is decrypted according to the public key to obtain the symmetric key, and the encrypted original image is decrypted according to the symmetric key to obtain the original image.

In a further description, the added module is specifically used for:

Set the decrypted original image as the bottom layer, as the original image layer;

The watermark text information is added to a transparent canvas to generate a watermark layer with the same size as the original image, and the watermark layer and the original image layer are superimposed and displayed.

In further illustration, said add-on module is also used to:

Add the configured annotation data to the transparent canvas to generate an annotation layer of the same size as the original image;

Put the annotation layer at the top, the watermark layer at the middle layer, and the original image layer at the bottom.

In a further description, the device also includes a request module, configured to:

After determining the trigger information for the user to visit the original image again, request the annotation layer according to the user ID and the original image ID information, determine the existence of the annotation layer, and arrange the original image layer, watermark layer, and annotation layer from bottom to top Display overlay.

Since the principle of the apparatus described in the embodiment of the present invention is the same as that of the method described in the foregoing embodiments, more detailed explanations will not be repeated here.

It should be noted that, in the embodiment of the present invention, a hardware processor (hardware processor) may be used to implement related functional modules.

The processing device suitable for watermarked pictures provided by the present invention securely transmits the original picture based on the asymmetric key and the symmetric key, and adds the watermark to the original picture by the front-end server, so as to prevent illegal personnel from obtaining picture information by capturing packets, and improve It not only improves the security of data processing, but also provides rapid implementation of traceable watermark information, reducing the pressure of back-end processing.

FIG. 5 illustrates a schematic diagram of the physical structure of an electronic device. As shown in FIG. 5, the electronic device may include: a processor (processor) 51, a communication interface (Communication Interface) 52, a memory (memory) 53 and a communication bus 54, Wherein, the processor 51 , the communication interface 52 , and the memory 53 communicate with each other through the communication bus 54 . The processor 51 can call the computer program in the memory 53 to execute the steps of the processing method applicable to the watermark image, for example, including: encrypting the original image with a symmetric key, and encrypting the symmetric key with an asymmetric key; The encrypted original image, encrypted symmetric key, watermark text information, and identification information of the original image are sent to the front-end server, so that the front-end server adds a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is the front-end The information required for adding watermarks when the server accesses the original image.

Or, for example, include: the front-end server receives the encrypted original image sent by the back-end server, the encrypted symmetric key and watermark text information, and the identification information of the original image; wherein, the back-end server encrypts the original image with a symmetric key , and using an asymmetric key to encrypt the symmetric key; adding a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is information required for adding a watermark when the front-end server accesses the original image.

In addition, the above-mentioned logic instructions in the memory 53 may be implemented in the form of software function units and may be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disk or optical disk and other media that can store program codes.

On the other hand, the present invention also provides a computer program product, the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer During execution, the computer can execute the steps of the above-mentioned processing method applicable to watermarked pictures, for example including: encrypting the original picture with a symmetric key, and encrypting the symmetric key with an asymmetric key; The symmetric key, watermark text information, and identification information of the original image are sent to the front-end server, so that the front-end server can add a watermark to the decrypted original image according to the watermark text information; among them, the watermark text information is added in the process of accessing the original image by the front-end server Information required for the watermark.

Or, for example, include: the front-end server receives the encrypted original image sent by the back-end server, the encrypted symmetric key and watermark text information, and the identification information of the original image; wherein, the back-end server encrypts the original image with a symmetric key , and using an asymmetric key to encrypt the symmetric key; adding a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is information required for adding a watermark when the front-end server accesses the original image.

On the other hand, the embodiment of the present application also provides a processor-readable storage medium, the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the above-mentioned method applicable to watermark pictures. The steps of the processing method include, for example: encrypting the original image with a symmetric key, and encrypting the symmetric key with an asymmetric key; The identification information is sent to the front-end server, so that the front-end server adds a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is information required for adding a watermark when the front-end server accesses the original image.

Or, for example, include: the front-end server receives the encrypted original image sent by the back-end server, the encrypted symmetric key and watermark text information, and the identification information of the original image; wherein, the back-end server encrypts the original image with a symmetric key , and using an asymmetric key to encrypt the symmetric key; adding a watermark to the decrypted original image according to the watermark text information; wherein, the watermark text information is information required for adding a watermark when the front-end server accesses the original image.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (such as ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid-state disk (SSD)), etc.

The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without any creative effort.

Through the above description of the implementations, those skilled in the art can clearly understand that each implementation can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic discs, optical discs, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A processing method for a watermark picture, comprising:

the back-end server encrypts the original image by adopting a symmetric key and encrypts the symmetric key by adopting an asymmetric key;

sending the encrypted original image, the encrypted symmetric key and watermark text information and the identification information of the original image to a front-end server so that the front-end server adds a watermark to the decrypted original image according to the watermark text information; and the watermark text information is information required by adding the watermark in the process of accessing the original image by the front-end server.

2. The processing method for watermarking pictures according to claim 1, wherein the encrypting the symmetric key with the asymmetric key comprises:

and encrypting the symmetric key by using a private key in the asymmetric key.

3. The processing method for watermarking pictures according to claim 2, wherein the method further comprises:

receiving a request sent by the front-end server, wherein the request comprises identification information of the original image;

and acquiring a public key in the asymmetric key according to the identification information of the original image, sending the public key to the front-end server so that the front-end server decrypts the encrypted symmetric key according to the public key to obtain the symmetric key, and decrypting the encrypted original image according to the symmetric key to obtain the original image.

4. A processing method for a watermark picture, comprising:

the front-end server receives the encrypted original image, the encrypted symmetric key and the encrypted watermark text information and the identification information of the original image which are sent by the back-end server; the back-end server encrypts the original image by adopting a symmetric key and encrypts the symmetric key by adopting an asymmetric key;

adding a watermark to the decrypted original image according to the watermark text information; and the watermark text information is information required by adding the watermark in the process of accessing the original image by the front-end server.

5. The processing method for the watermark picture according to claim 4, wherein the back-end server encrypts the symmetric key by using a private key in the asymmetric key, and accordingly, the method further includes decrypting the encrypted original image before adding the watermark to the decrypted original image according to the watermark text information, including:

sending a request to the back-end server, wherein the request comprises identification information of the original image, so that the back-end server obtains a public key in the asymmetric key according to the identification information of the original image and sends the public key to the front-end server;

and decrypting the encrypted symmetric key according to the public key to obtain the symmetric key, and decrypting the encrypted original image according to the symmetric key to obtain the original image.

6. The processing method suitable for the watermark picture according to claim 4 or 5, wherein the watermarking the decrypted original picture according to the watermark text information includes:

setting the decrypted original image as a bottommost image layer as an original image layer;

and adding the watermark text information to a transparent canvas, generating a watermark layer with the same size as the original image, and displaying the watermark layer and the original image layer in an overlapping manner.

7. The processing method for watermarking pictures according to claim 6, wherein the method further comprises:

adding the configured annotation data to a transparent canvas to generate an annotation layer with the same size as the original image;

and the annotation layer is positioned on the uppermost layer, the watermark layer is a middle layer, and the original image layer is positioned on the bottommost layer.

8. The processing method applied to the watermark picture according to claim 7, wherein the method further comprises:

and after determining that the user accesses the triggering information of the original image again, requesting an annotation image layer according to the user identification and the original image identification information, determining that the annotation image layer exists, and performing superposition display on the original image layer, the watermark image layer and the annotation image layer from bottom to top.

9. An electronic device comprising a processor and a memory storing a computer program, wherein the processor implements the steps of the processing method for watermarking pictures according to any one of claims 1 to 3, or implements the steps of the processing method for watermarking pictures according to any one of claims 4 to 8 when executing the computer program.

10. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to execute the steps of the processing method for watermarking pictures according to any one of claims 1 to 3 or to implement the steps of the processing method for watermarking pictures according to any one of claims 4 to 8.

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