CN112765675A - Data processing method and device based on block chain - Google Patents
Data processing method and device based on block chain Download PDFInfo
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- CN112765675A CN112765675A CN201911061491.XA CN201911061491A CN112765675A CN 112765675 A CN112765675 A CN 112765675A CN 201911061491 A CN201911061491 A CN 201911061491A CN 112765675 A CN112765675 A CN 112765675A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/958—Organisation or management of web site content, e.g. publishing, maintaining pages or automatic linking
Abstract
The application discloses a data processing method and device based on a block chain, which can effectively guarantee authenticity and reliability of webpage information. The method comprises the following steps: firstly, data representing webpage information in a target webpage are acquired and used as first target data to be displayed, and then the first target data are stored in a block chain, so that a user can acquire the first target data through the block chain.
Description
Technical Field
The present application relates to the field of block chain technologies, and in particular, to a data processing method and apparatus based on a block chain.
Background
In recent years, with the rapid development of network technologies, people can obtain information such as browsing web pages, watching videos online and the like by connecting electronic devices such as mobile phones, tablet computers and the like to the internet anytime and anywhere.
However, currently, when a user browses a web page, the authenticity of information (such as characters, pictures, videos, and the like) displayed on the web page cannot be confirmed, because the web page information is most likely to be data after being tampered, which causes that the information displayed on the web page is inconsistent with the actual data, for example, when the user browses brand a milk, for example, when the user clicks an introduction web page of the milk, recommended information about brand B milk or other web page information which is completely inconsistent with the attribute of the milk is displayed. In this regard, from the perspective of the user, there is no way to confirm whether information such as text, pictures, and video displayed on a web page is authentic. Therefore, there is a lack in the prior art of a method for ensuring the authenticity and reliability of web page information.
Disclosure of Invention
The embodiment of the application mainly aims to provide a data processing method and device based on a block chain, which can effectively ensure the authenticity and reliability of webpage information.
In a first aspect, an embodiment of the present application provides a data processing method based on a block chain, including:
acquiring first target data to be displayed, wherein the first target data represents webpage information in a target webpage;
and storing the first target data to a block chain so that a user can acquire the first target data through the block chain.
Optionally, the storing the first target data onto a block chain includes:
linking the first target data to a block chain in a text form;
and/or linking the first target data to a block chain in a hash mode.
Optionally, after the storing the first target data to the blockchain so that a user acquires the first target data through the blockchain, the method further includes:
signing the target webpage by using a preset key;
and storing the preset key to the block chain.
Optionally, the method further includes:
confirming the first target data through a third party auditor to obtain confirmed first target data;
and signing the target webpage to which the confirmed first target data belongs so as to ensure the authenticity of the first target data.
In a second aspect, an embodiment of the present application further provides a data processing method based on a block chain, including:
downloading second target data from the target webpage;
acquiring third target data stored in the block chain;
verifying the signature of the third target data by using a preset key to confirm the authenticity of the third target data;
after the third target data are confirmed to be real data, judging whether the second target data and the third target data are consistent;
and if so, determining that the second target data is real data.
In a third aspect, an embodiment of the present application further provides a data processing apparatus based on a block chain, including:
the first acquisition unit is used for acquiring first target data to be displayed, and the first target data represents webpage information in a target webpage;
the first storage unit is used for storing the first target data to a block chain so that a user can obtain the first target data through the block chain.
Optionally, the first storage unit includes:
the first linking subunit is used for linking the first target data to the block chain in a text form;
and/or the second linking subunit is used for linking the first target data to the block chain in a hash mode.
Optionally, the apparatus includes:
the first signature unit is used for signing the target webpage by using a preset key;
and the second storage unit is used for storing the preset key to the block chain.
Optionally, the apparatus further comprises:
the confirming unit is used for confirming the first target data through a third party auditor to obtain the confirmed first target data;
and the second signature unit is used for signing the target webpage to which the confirmed first target data belongs so as to ensure the authenticity of the first target data.
In a fourth aspect, an embodiment of the present application further provides a data processing apparatus based on a block chain, including:
the downloading unit is used for downloading second target data from the target webpage;
a second acquisition unit configured to acquire third target data stored in the block chain;
the verification unit is used for verifying the signature of the third target data by using a preset key so as to confirm the authenticity of the third target data;
a determining unit, configured to determine whether the second target data and the third target data are consistent after the third target data is determined to be real data;
and the determining unit is used for determining the second target data as real data if the second target data is judged to be consistent with the third target data.
An embodiment of the present application further provides a data processing device based on a block chain, including: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is configured to store one or more programs, the one or more programs including instructions, which when executed by the processor, cause the processor to perform any one implementation of the above block chain based data processing method.
An embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are run on a terminal device, the terminal device is enabled to execute any implementation manner of the data processing method based on the block chain.
According to the data processing method and device based on the block chain, data representing webpage information in a target webpage are firstly obtained and serve as first target data to be displayed, and then the first target data are stored in the block chain, so that a user can obtain the first target data through the block chain. Therefore, the block chain is used as a third-party data storage system to store the target data in the embodiment of the application, so that the non-tamper-ability of the data among parties can be effectively ensured in a form of connecting blocks one by one, and therefore, the linkage mechanism ensures that the target data cannot be changed once the target data is written into the blocks, and further ensures the authenticity and reliability of the webpage information represented by the target data.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a data processing method based on a block chain according to an embodiment of the present application;
fig. 2 is a schematic flowchart of another data processing method based on a blockchain according to an embodiment of the present disclosure;
fig. 3 is a schematic composition diagram of a data processing apparatus based on a block chain according to an embodiment of the present application;
fig. 4 is a schematic composition diagram of another data processing apparatus based on a blockchain according to an embodiment of the present disclosure.
Detailed Description
At present, with the rapid development of network technology, a user can usually connect to a network through any terminal device to acquire network information anytime and anywhere, but at present, when the user browses a webpage, the authenticity and reliability of information displayed in the webpage cannot be confirmed, because the information displayed in the existing webpage has the possibility of being tampered by illegal merchants and users, the information displayed in the webpage is inconsistent with the real information.
In order to solve the foregoing defect, an embodiment of the present application provides a data processing method based on a blockchain, where data representing webpage information in a target webpage is first obtained and used as first target data to be displayed, and then the first target data is stored in the blockchain, so that a user can obtain the first target data through the blockchain. Therefore, the block chain is used as a third-party data storage system to store the first target data, so that the non-tamper property of the data among parties can be effectively guaranteed in a form of connecting blocks one by one, and the linkage mechanism guarantees that the target data cannot be changed once the target data is written into the blocks, so that the authenticity and reliability of the webpage information represented by the target data are guaranteed.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
First embodiment
Referring to fig. 1, a schematic flow chart of a data processing method based on a block chain provided in this embodiment is shown, where the method includes the following steps:
s101: the method comprises the steps of obtaining first target data to be displayed, wherein the first target data represent webpage information in a target webpage.
In this embodiment, any data processed by the present embodiment is defined as first target data, and a webpage displaying the first target data is defined as a target webpage, that is, a webpage in which the first target data is used as a webpage resource is defined as a target webpage.
In order to accurately display the web page information of the target web page and ensure the authenticity and reliability of the web page information, first target data to be displayed needs to be acquired for executing the subsequent step S102.
The first target data refers to data representing webpage information in a target webpage and belongs to webpage resources of the target webpage. For example, when designing a web page (e.g., a navigation page) browsed by a user, a web page designer needs to display corresponding pictures, texts, videos, and the like, and each of the pictures, texts, and videos may be referred to as first target data.
For example, the following steps are carried out: when it is detected that the user clicks the advertisement of the air conditioner of the brand a, or when it is detected that the user searches the air conditioner of the brand a by using a search engine, a target webpage needs to be popped up, and extended contents related to the air conditioner of the brand a, such as attribute information of the air conditioner of the brand a, such as the number of matches, the material, the model, the price and the like, need to be displayed in the webpage, and data representing the extended contents in the webpage can be used as first target data.
S102: and storing the first target data to the block chain so that a user can acquire the first target data through the block chain.
In this embodiment, after the first target data to be displayed is acquired in step S101, in order to ensure authenticity and reliability of the webpage information represented by the first target data, the first target data may be further linked to a block chain for storage by using an existing or future data link manner, for example, a hash manner may be adopted for linking, so as to ensure that the first target data is not tamper-proof in the block chain by using a form that blocks in the block chain are connected one by one, so that a user may acquire the true and reliable first target data through the block chain, that is, acquire the data representing the webpage information in the target webpage.
In a possible implementation manner of this embodiment, a specific implementation procedure of "storing the first target data onto the block chain" in this step S102 may include the following step a1 and/or step a 2:
step A1, link the first target data to the blockchain in the original text.
In this implementation manner, in order to ensure the authenticity and reliability of the first target data, after the first target data is acquired, not only the first target data may be used to design a webpage, but also the first target data may be linked to the block chain in an original text form.
Step A2: and linking the first target data to the block chain in a hash mode.
In this implementation, in addition to linking the first target data to the block chain in the original form through step a1, in order to further improve the reliability of the first target data, the first target data may be linked to the block chain in a hash form, that is, the first target data is converted into a hash value and then linked to the block chain.
Where a hash value refers to a unique and extremely compact representation of a value characterizing a first target datum, a subsequent hash will yield a different value for a plaintext segment of the hash, even if only one of the letters is changed. That is, for different data, the corresponding hash values are different, and the hash values have uniqueness, so that the data corresponding to the webpage designed by each webpage designer can be linked to the block chain in a hash value manner to ensure the uniqueness of the data.
In a possible implementation manner of this embodiment, after the first target data is stored onto the block chain in step S102, the following steps B1-B2 may be further performed:
step B1: and signing the target webpage by using a preset key.
In this implementation, after the first target data is stored in the block chain, in order to further improve the security of the data, the target webpage needs to be signed by using a preset key after the target webpage is designed.
The process of signing the target webpage is to add some secret key data to the webpage data to be signed, for example, to add a public key of a webpage designer, or to perform password transformation on the webpage data, so as to obtain the signed target webpage, thereby ensuring the authenticity of the webpage resource (i.e., the first target data) contained therein and avoiding the target webpage from being faked and tampered maliciously.
Step B2: and storing the preset key to the block chain.
After the target webpage is signed by using the preset key in step B1, the preset key may be stored in the block chain, so that the identity of the sender of the first target data (for example, the sender may be the designer of the target webpage) is authenticated subsequently, and the non-repudiation of the sender in the data transmission process is realized.
It should be noted that, since the webpage designer can freely store the first target data in the target webpage to the blockchain, in order to further ensure the authenticity of the data, the following steps C1-C2 can be executed to introduce a third party auditor to confirm the first target data, so as to ensure the authenticity and reliability of the webpage information.
Step C1: and confirming the first target data through a third party auditor to obtain the confirmed first target data.
In this implementation manner, in order to further ensure the authenticity and reliability of the web page information, a third-party auditor is further introduced to be used as a monitoring mechanism to confirm the first target data stored in the blockchain, for example, an organization having a credit investigation right, such as a government monitoring mechanism of the third party, a third-party monitoring mechanism, and the like, may be used as the third-party auditor to perform data analysis on the first target data to obtain the confirmed first target data. To continue to the subsequent step C2.
Step C2: and signing the confirmed target webpage to which the first target data belongs to ensure the authenticity of the first target data.
In this implementation, after the first target data confirmed by the third-party auditor is obtained in step C1, the target webpage to which the confirmed first target data belongs may be further signed by using a signature method existing in the prior art or occurring in the future, for example, the target webpage may be re-signed by using a preset key to indicate that the webpage resource (i.e., the first target data) included in the target webpage is verified and has authenticity and reliability.
In summary, in the data processing method based on the blockchain provided in this embodiment, first, data representing webpage information in a target webpage is obtained as first target data to be displayed, and then, the first target data is stored in the blockchain, so that a user can obtain the first target data through the blockchain. Therefore, the block chain is used as a third-party data storage system to store the target data in the embodiment of the application, so that the non-tamper-ability of the data among parties can be effectively ensured in a form of connecting blocks one by one, and therefore, the linkage mechanism ensures that the target data cannot be changed once the target data is written into the blocks, and further ensures the authenticity and reliability of the webpage information represented by the target data.
Second embodiment
Referring to fig. 2, a schematic flow chart of another data processing method based on a blockchain provided in this embodiment is shown, where the method includes the following steps:
s201: and downloading the second target data from the target webpage.
In this embodiment, any data processed by the present embodiment is defined as the second target data, and in order to confirm the authenticity of the second target data to ensure the authenticity and reliability of the webpage information in the target webpage, the second target data downloaded from the target webpage needs to be acquired first to execute the subsequent step S202.
The second target data refers to a webpage resource downloaded from a target webpage when a user browses the target webpage, and the data type of the second target data is not limited in this embodiment, for example, the second target data may be characters, pictures, videos, or the like.
S202: third target data stored in the blockchain is acquired.
In this embodiment, the first target data stored in the block chain in the manner described in the first embodiment is defined as the third target data, and the authenticity of the second target data is determined through the following steps S203 to S206 based on this determination.
S203: and verifying the signature of the target webpage by using a preset key so as to confirm the authenticity of the third target data.
In this embodiment, after the target webpage is downloaded, the signature of the target webpage may be verified by using the preset key adopted in step B1, so as to authenticate the identity of the sender of the third target data (for example, the sender may be the designer of the target webpage) to confirm the authenticity of the third target data stored in the block chain. For example, whether the target webpage is tampered or not, or whether the information issued by the sending end of the target webpage is real or not can be quickly confirmed. The specific verification method is consistent with the existing method, and is not described herein again.
S204: and after the third target data is confirmed to be real data, judging whether the second target data is consistent with the third target data.
After the third target data is determined to be the real data through step S203, the second target data downloaded from the target webpage may be further compared with the third target data stored in the block chain, and if the second target data is consistent with the third target data, step S205 is executed; if not, go to step S206.
Specifically, if the third target data is linked to the blockchain in the form of original text, the downloaded second target data (including characters, videos, images, etc.) can be directly used to compare with the third target data on the blockchain, and determine whether the second target data and the third target data are consistent, if so, step S205 is executed; if not, go to step S206.
Or, if the third target data is linked to the block chain in the form of hash, the second target data (including characters, videos, images, and the like) needs to be converted into a hash value first, and then compared with the third target data stored in the form of hash value on the block chain to determine whether the two are consistent, if so, step S205 is executed; if not, go to step S206.
S205: if the second target data is consistent with the third target data, the second target data can be determined to be real data.
S206: if the second target data is determined to be inconsistent with the third target data, the second target data can be determined to be non-real data.
In summary, in the data processing method based on the block chain provided in this embodiment, first, second target data is downloaded from a target webpage, and a third target number stored in the block chain is obtained, and then, a signature to which the third target data belongs is verified by using a preset key, so that after the authenticity of the third target data is confirmed, whether the second target data and the third target data are consistent is determined, and if so, it can be determined that the second target data is real data. Therefore, in the embodiment of the application, the third target data stored in the block link is used as the real data to measure the second target data, so that the authenticity and the reliability of the second target data can be accurately determined by using the non-tamper property of the data stored in the block link, and the authenticity and the reliability of the webpage information of the target webpage represented by the second target data are further ensured.
Third embodiment
In this embodiment, a data processing apparatus based on a block chain will be described, and please refer to the above method embodiments for related contents.
Referring to fig. 3, a schematic composition diagram of a data processing apparatus based on a block chain according to this embodiment is provided, where the apparatus includes:
a first obtaining unit 301, configured to obtain first target data to be displayed, where the first target data represents web page information in a target web page;
a first storage unit 302, configured to store the first target data onto a blockchain, so that a user can obtain the first target number through the blockchain.
In an implementation manner of this embodiment, the first storage unit 302 includes:
the first linking subunit is used for linking the first target data to the block chain in a text form;
and/or the second linking subunit is used for linking the first target data to the block chain in a hash mode.
In one implementation manner of this embodiment, the apparatus includes:
the first signature unit is used for signing the target webpage by using a preset key;
and the second storage unit is used for storing the preset key to the block chain.
In an implementation manner of this embodiment, the apparatus further includes:
the confirming unit is used for confirming the first target data through a third party auditor to obtain the confirmed first target data;
and the second signature unit is used for signing the target webpage to which the confirmed first target data belongs so as to ensure the authenticity of the first target data.
In summary, in the data processing apparatus based on the blockchain provided in this embodiment, first data representing webpage information in a target webpage is obtained as first target data to be displayed, and then the first target data is stored in the blockchain, so that a user can obtain the first target data through the blockchain. Therefore, the block chain is used as a third-party data storage system to store the target data in the embodiment of the application, so that the non-tamper-ability of the data among parties can be effectively ensured in a form of connecting blocks one by one, and therefore, the linkage mechanism ensures that the target data cannot be changed once the target data is written into the blocks, and further ensures the authenticity and reliability of the webpage information represented by the target data.
Fourth embodiment
In this embodiment, another data processing apparatus based on a block chain will be described, and please refer to the above method embodiments for related contents.
Referring to fig. 4, a schematic composition diagram of another data processing apparatus based on a blockchain provided in this embodiment is shown, where the apparatus includes:
a downloading unit 401, configured to download second target data from the target webpage;
a second obtaining unit 402, configured to obtain third target data stored in the block chain;
a verification unit 403, configured to verify the signature to which the third target data belongs by using a preset key, so as to confirm the authenticity of the third target data;
a determining unit 404, configured to determine whether the second target data and the third target data are consistent after the third target data is determined to be real data;
a determining unit 405, configured to determine that the second target data is real data if it is determined that the second target data is consistent with the third target data.
In summary, in the data processing apparatus based on the block chain provided in this embodiment, first, second target data is downloaded from a target webpage, and a third target number stored in the block chain is obtained, and then, a signature to which the third target data belongs is verified by using a preset key, so as to determine whether the second target data and the third target data are consistent after the authenticity of the third target data is confirmed, and if so, it may be determined that the second target data is real data. Therefore, in the embodiment of the application, the third target data stored in the block link is used as the real data to measure the second target data, so that the authenticity and the reliability of the second target data can be accurately determined by using the non-tamper property of the data stored in the block link, and the authenticity and the reliability of the webpage information of the target webpage represented by the second target data are further ensured.
Further, an embodiment of the present application further provides a data processing device based on a block chain, including: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is used for storing one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform any of the above-described methods of implementing blockchain-based data processing.
Further, an embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are run on a terminal device, the terminal device is caused to execute any implementation method of the above data processing method based on a blockchain.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A data processing method based on a block chain is characterized by comprising the following steps:
acquiring first target data to be displayed, wherein the first target data represents webpage information in a target webpage;
and storing the first target data to a block chain so that a user can acquire the first target data through the block chain.
2. The method of claim 1, wherein storing the first target data onto a block chain comprises:
linking the first target data to a block chain in a text form;
and/or linking the first target data to a block chain in a hash mode.
3. The method of claim 1, wherein storing the first target data onto a blockchain so that a user obtains the first target data through the blockchain further comprises:
signing the target webpage by using a preset key;
and storing the preset key to the block chain.
4. The method of claim 1, further comprising:
confirming the first target data through a third party auditor to obtain confirmed first target data;
and signing the target webpage to which the confirmed first target data belongs so as to ensure the authenticity of the first target data.
5. A data processing method based on a block chain is characterized by comprising the following steps:
downloading second target data from the target webpage;
acquiring third target data stored in the block chain;
verifying the signature of the third target data by using a preset key to confirm the authenticity of the third target data;
after the third target data are confirmed to be real data, judging whether the second target data and the third target data are consistent;
and if so, determining that the second target data is real data.
6. A blockchain-based data processing apparatus, comprising:
the first acquisition unit is used for acquiring first target data to be displayed, and the first target data represents webpage information in a target webpage;
the first storage unit is used for storing the first target data to a block chain so that a user can obtain the first target data through the block chain.
7. The apparatus of claim 6, wherein the first storage unit comprises:
the first linking subunit is used for linking the first target data to the block chain in a text form;
and/or the second linking subunit is used for linking the first target data to the block chain in a hash mode.
8. The apparatus of claim 6, wherein the apparatus comprises:
the first signature unit is used for signing the target webpage by using a preset key;
and the second storage unit is used for storing the preset key to the block chain.
9. The apparatus of claim 6, further comprising:
the confirming unit is used for confirming the first target data through a third party auditor to obtain the confirmed first target data;
and the second signature unit is used for signing the target webpage to which the confirmed first target data belongs so as to ensure the authenticity of the first target data.
10. A blockchain-based data processing apparatus, comprising:
the downloading unit is used for downloading second target data from the target webpage;
a second acquisition unit configured to acquire third target data stored in the block chain;
the verification unit is used for verifying the signature of the third target data by using a preset key so as to confirm the authenticity of the third target data;
a determining unit, configured to determine whether the second target data and the third target data are consistent after the third target data is determined to be real data;
and the determining unit is used for determining the second target data as real data if the second target data is judged to be consistent with the third target data.
11. A blockchain-based data processing apparatus, comprising: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is to store one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform the method of any of claims 1-5.
12. A computer-readable storage medium having stored therein instructions that, when executed on a terminal device, cause the terminal device to perform the method of any one of claims 1-5.
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