CN105657647B - NFC-based data transmission method and system - Google Patents

Abstract

It is authenticated the invention discloses a kind of data transmission method based on NFC and between system, including intelligent terminal and intelligent information terminal by NFC and obtains dynamic labels；Intelligent information terminal sends the transmission request for carrying dynamic labels, smart cards for storage dynamic labels to smart card；Smart card issues the transmission request for carrying dynamic labels to intelligent terminal；The dynamic labels that carrying was requested and verified to intelligent terminal reception transmitting from smart card are legal, obtain the content information of transmission.The technical solution provided through the invention, after being authenticated between intelligent terminal and intelligent information terminal by NFC, directly interacted by way of carrying current dynamic labels, it all can first be authenticated before transmitting data every time i.e. between intelligent terminal and intelligent information terminal, solve the data transmission problems based on NFC technique, it ensure that the safety of communication simultaneously, to improve the satisfaction that user uses.

Description

NFC-based data transmission method and system

technical field

The present invention relates to a near field communication technology, in particular to a data transmission method and system based on near field communication (NFC, Near Field Communication).

Background technique

Near Field Communication (NFC) technology has the characteristics of short communication distance, short connection establishment time, low energy consumption, high security, simple network topology, low cost, convenience and intuitiveness. Moreover, NFC is compatible with existing contactless smart card technology, and is very suitable for contactless services applied to mobile smart terminals to achieve rapid exchange of important data such as financial information or sensitive personal information. The NFC Forum has defined a generic data format called the NFC Data Exchange Format (NDEF). NDEF is a lightweight compact binary format that can carry various data types defined by URL, vCard and NFC.

The two sides of the NFC communication device cannot communicate normally due to the different protocols and functions supported by the devices. NFC communication is a device-to-device (M2M) communication method, which is different from traditional 2G, 3G and other mobile Internet communication methods, requiring both communication devices to be on the same protocol.

At present, due to the fact that NFC technology itself relies on storage media, and the communication methods and standards are not uniform, it is still impossible to solve the problem of the uniformity of data transmission based on NFC technology. Therefore, the solution cannot be realized normally during the NFC communication process.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a method and system for data transmission based on NFC, which can solve the problem of data transmission based on NFC technology, ensure the security of communication, and improve user satisfaction.

In order to achieve the purpose of the present invention, the present invention provides a data transmission method based on short-range communication NFC, comprising: passing NFC authentication between an intelligent terminal and an intelligent information terminal and obtaining a dynamic tag;

The intelligent information terminal sends a transmission request carrying the dynamic tag to the smart card, and the smart card stores the dynamic tag;

The smart card sends a transmission request carrying the dynamic tag to the smart terminal; the smart terminal receives the transmission request from the smart card and verifies that the carried dynamic tag is legal, and obtains the transmitted content information.

Optionally, passing NFC authentication between the smart terminal and the smart information terminal includes:

The smart terminal generates a random challenge code, and requests the smart card to obtain a certificate public key;

The intelligent terminal encrypts the challenge code after receiving the certificate public key, and sends the encrypted challenge code information to the intelligent information terminal. The decrypted challenge code is sent to the smart terminal for verification, and if the verification is passed, it is considered to have passed the NFC authentication.

Optionally, the smart terminal is an NFC smart terminal, and the smart card is a SWP-NFC smart card;

The transmission request is a result of pushing information/querying information.

Optionally, the smart information terminal sends a transmission request carrying a dynamic tag to the smart card, and the smart card stores the dynamic tag including:

When the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal in the card simulation state pushes the information carrying the dynamic tag to the SWP-NFC card;

When the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and then the intelligent information terminal in the card simulation state sends the SWP - The NFC card pushes the query information result carrying the dynamic tag;

The smart card sending a transmission request carrying a dynamic label to the smart terminal includes:

The SWP-NFC card transmits the obtained push information/query information result carrying the dynamic tag to the NFC smart terminal.

Optionally, the smart terminal is a non-NFC smart terminal, and the smart card is a dual-interface card;

The transmission request is a result of pushing information/querying information.

Optionally, the smart information terminal sends a transmission request carrying a dynamic tag to the smart card, and the smart card stores the dynamic tag including:

If the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal in the card reader state writes the push information carrying the dynamic tag into the dual interface of the non-NFC intelligent terminal in the file of the card;

If the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and then the intelligent information terminal in the card reader state will The query information result carrying the dynamic tag is written into the file of the dual-interface card of the non-NFC smart terminal;

The smart card sending a transmission request carrying a dynamic label to the smart terminal includes:

The non-NFC smart terminal verifies the legality of the dynamic tag from the dual-interface card and obtains the result of push information or query information.

The present invention also provides an NFC-based data transmission system, including at least a smart information terminal, a smart terminal, and a smart card; wherein,

The intelligent information terminal is used to pass the NFC authentication with the intelligent terminal and obtain the dynamic tag through the smart card; send a transmission request carrying the dynamic tag to the smart card, and the smart card stores the dynamic tag;

The smart card is used to send a transmission request with a dynamic tag to the smart terminal;

The smart terminal is used to receive the transmission request from the smart card, verify the validity of the carried dynamic tag, and obtain the transmitted content information.

Optionally, when the smart terminal is an NFC smart terminal, the smart card is a SWP-NFC card; at this time,

The intelligent information terminal is specifically configured to receive the application category instruction, and send the push information/query information result carrying the dynamic tag to the SWP-NFC card;

The SWP-NFC card is specifically used to transmit the obtained push information/query information result carrying the dynamic tag to the NFC smart terminal.

Optionally, the intelligent information terminal is specifically configured to: when the instruction received by the intelligent information terminal in the card reader state is a push instruction, and when the intelligent information terminal is in a card simulation state, to the SWP- The NFC card sends push information with dynamic tags;

When the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and the intelligent information terminal in the card simulation state sends the SWP-NFC The card pushes the query information result carrying the dynamic tag.

Optionally, when the smart terminal is a non-NFC smart terminal, the smart card is a dual-interface card; at this time,

The intelligent information terminal is specifically used to receive the application category instruction and enter the card reader state, and the intelligent information terminal writes the push information/query information result carrying the dynamic tag to the non-NFC smart tag in a manner based on the NDEF dynamic tag. In the dual interface card file of the terminal;

The non-NFC smart terminal is specifically used to verify the legality of the dynamic tag and obtain the result of push information or query information.

Optionally, the intelligent information terminal is specifically used for: when the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal in the card reader state will carry a dynamic tag. The push information is written into the dual interface card file of the non-NFC smart terminal;

When the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and the intelligent information terminal in the card reader state will carry dynamic information The query information result of the tag is written into the dual interface card file of the non-NFC smart terminal.

Compared with the prior art, the present invention includes NFC authentication between the intelligent terminal and the intelligent information terminal to obtain a dynamic label; the intelligent information terminal sends a transmission request carrying the dynamic label to the intelligent card, and the intelligent card stores the dynamic label; the intelligent card sends a transmission request to the intelligent terminal. The transmission request carrying the dynamic label; the smart terminal receives the transmission request from the smart card and verifies the validity of the dynamic label carried, and obtains the content information of the transmission. Through the technical solution provided by the present invention, after passing the NFC authentication between the intelligent terminal and the intelligent information terminal, the interaction is carried out directly by carrying a dynamic tag, that is, the authentication is performed before each data transmission between the intelligent terminal and the intelligent information terminal. , solves the problem of data transmission based on NFC technology, and at the same time, because the data encryption and signature of dynamic tags change in real time, it increases the difficulty for artificial cracking, thus ensuring the security of communication, thus improving the user satisfaction.

Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. They are used to explain the technical solutions of the present invention together with the embodiments of the present application, and do not limit the technical solutions of the present invention.

Fig. 1 is the schematic diagram of the single service model oriented to NFC service of the present invention;

Fig. 2 is the flow chart of the data transmission method based on NFC of the present invention;

3 is a schematic flowchart of an embodiment of the interaction between an NFC smart terminal and an intelligent information terminal according to the present invention;

4 is a schematic flowchart of an embodiment of the interaction between a non-NFC smart terminal and a smart information terminal according to the present invention;

FIG. 5 is a schematic diagram of the composition and structure of the NFC-based data transmission system of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, the embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other if there is no conflict.

The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that herein.

As a communication method, NFC technology itself is only the communication interface of the device. From the perspective of the NFC asa Service mode currently advocated internationally, NFC technology is truly promoted as a service. According to the NFC as a Service model, the inventor of the present application proposes a business model oriented to NFC services. As shown in Figure 1, an NFC connection is established between the smart terminal and the smart information terminal, and the smart terminal and the smart information terminal are respectively connected to The NFC business platform establishes a data channel. in,

NFC business platform, mainly used for NFC business management, such as NFC business opening, closing, equipment maintenance, software update, etc.;

Intelligent information terminal is the front terminal of the business platform, used for information release and acceptance of query requests, such as terminals in public places such as stores and subways;

Smart terminals, which are equipped with terminals such as mobile phones and PADs with smart cards, serve as human-machine interfaces to provide users with NFC service push, interaction, etc. collectively.

With reference to FIG. 1, FIG. 2 is a flowchart of the NFC-based data transmission method of the present invention, as shown in FIG. 2, including:

Step 200: Pass NFC authentication between the smart terminal and the smart information terminal and obtain a dynamic tag.

This step specifically includes: the smart terminal generates a random challenge code, and requests the smart card to obtain the public key of the certificate; after receiving the public key of the certificate, the smart terminal encrypts the challenge code, and sends the encrypted challenge code information to the smart information terminal. The information terminal uses the private key to decrypt the received challenge code, and sends the decrypted challenge code to the smart terminal for verification. If the verification passes, it is considered to have passed the NFC authentication and a dynamic tag has been obtained.

The dynamic tag is a tag based on the NDEF format, and since each time before data transmission between the smart terminal and the smart information terminal, a random challenge code will be generated for authentication according to step 200, that is, it will change each time. , is a dynamic tag. That is to say, the interaction between the smart terminal and the smart information terminal is a dynamic tag based on the NDEF format.

Step 201: The intelligent information terminal sends a transmission request carrying a dynamic label to the smart card, that is, sends a transmission request to the smart card in a manner based on the NDEF dynamic label, and the smart card stores the dynamic label.

In this step, the transmission request may be a request for pushing information, or a request for issuing a query result.

In this step, the format of the NDEF dynamic tag is the NDEF format, and the NDEF is the encapsulation format of the Tag tag. In this step, a request is sent to the smart card by means of a Tag dynamic label, and the smart card acts as a storage device to save the generated NDEF dynamic label for subsequent reading and judgment by the terminal. The NDEF dynamic tag contains at least a Uniform Resource Locator (URL, Uniform Resource Locator), a Multipurpose Internet Mail Extension (MIME) medium or one or more records (Records) of NFC-defined data types.

Step 202: the smart card sends a transmission request carrying the dynamic tag to the smart terminal; the smart terminal receives the transmission request from the smart card, verifies that the carried dynamic tag is legal, and obtains the content information of the transmission.

In this step, the smart terminal compares whether the dynamic tag obtained by the NFC authentication in step 200 is consistent with the dynamic tag carried in the received transmission request, and if the two are consistent, it verifies that the carried dynamic tag is legal.

The NFC communication of the present invention refers to information interaction, including information push and information query. Wherein, information push means that the intelligent information terminal pushes information to the intelligent terminal; information query means that the intelligent terminal sends an information query request to the intelligent information terminal, and the intelligent information terminal queries the information and pushes the query result to the intelligent terminal.

Through the method of the present invention, after passing the NFC authentication between the intelligent terminal and the intelligent information terminal, the interaction is directly carried out by carrying a dynamic tag, that is, the authentication is performed before each data transmission between the intelligent terminal and the intelligent information terminal, which solves the problem. The data transmission problem based on NFC technology, at the same time, because the data encryption and signature of dynamic tags are changed in real time, which increases the difficulty for human cracking, thus ensuring the security of communication and improving the user satisfaction.

An example in combination with the actual scene is described as follows:

Scenario 1: The information push service of the store. By deploying in the information navigation terminal (intelligent information terminal) of the shopping mall, it publishes information or accepts user query requests. Every time the user wants to obtain the relevant information through NFC for the released information through the mobile phone (smart terminal) and present it as more detailed content, first, the mobile phone and the navigation terminal pass the NFC authentication and obtain the dynamic tag; During the subsequent information acquisition process between the mobile phone and the navigation terminal, the obtained dynamic tag is carried. The information navigation terminal will only accept the user query request and other operations after the information navigation terminal obtains the user information stored in the SE medium by the user for verification.

Scenario 2: Inquiry service at bus stops. Through the station information terminal deployed at the bus station and the bus card swiping device (smart information terminal), the station information and the vehicle arrival information are released, and the bus ride plan query and other services are provided. Before each information exchange, the mobile phone and the After the NFC authentication is completed between the card-rinsing devices and the dynamic tags are obtained, the user obtains the specific information of the site through the mobile phone (smart terminal), or submits a request for the route plan, and the information navigation terminal uses the dynamic tag based on NFC to push the information content, etc. Information push business.

During dynamic tag communication based on NFC technology, according to different solutions such as smart cards and terminals, the smart terminal of the present invention can be divided into two specific implementation modes: NFC smart terminal and non-NFC smart terminal. FIG. 3 is a schematic flowchart of an embodiment of the interaction between an NFC smart terminal and a smart information terminal according to the present invention. In this embodiment, it is assumed that the smart information terminal and the NFC smart terminal have passed the NFC authentication via the SWP-NFC card; and the smart information terminal always The polling process in the card emulation state and the card reader state; as shown in Figure 3, includes the following steps:

Step 300: the intelligent information terminal receives the application category instruction,

In this embodiment, when the intelligent information terminal is in the card reader mode, the received application category instruction may be an information push instruction, or an information query instruction and an information content query instruction.

Step 301: The intelligent information terminal sends the push information/query information result carrying the dynamic tag to the SWP-NFC card.

In this step, when the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal in the card simulation state will send the push information carrying the dynamic tag to the SWP-NFC card;

When the command received by the smart information terminal in the card reader state is an information query command and a query information content command, the smart information terminal queries the information in the background, and then the smart information terminal in the card simulation state pushes the SWP-NFC card with the The query information result of the dynamic label.

Step 302: The SWP-NFC card transmits the obtained push information/query information result carrying the dynamic tag to the NFC smart terminal.

In this step, after verifying that the carried dynamic tag is legal, the intelligent terminal will display the obtained push information/query information result to the user.

The way to realize NFC communication for non-intelligent terminals can only realize the card emulation mode at present, which brings a bottleneck to the near field communication. The present invention provides a technical solution as shown in FIG. 4 for non-intelligent terminals to realize NFC communication. Among them, the non-intelligent terminal can provide the NFC interface through the dual interface card technology.

FIG. 4 is a schematic flow chart of an embodiment of the interaction between a non-NFC smart terminal and a smart information terminal according to the present invention. In this embodiment, it is assumed that the smart information terminal and the non-NFC smart terminal have passed NFC authentication via a dual-interface card; as shown in FIG. 4 shown, including the following steps:

Step 400: The intelligent information terminal receives the application category instruction.

In this embodiment, when the intelligent information terminal is in the card reader mode, the received application category instruction may be an information push instruction, or an information query instruction and an information content query instruction.

Step 401: When the intelligent information terminal enters the card reader state, the intelligent information terminal writes the push information/query information result carrying the dynamic tag to the dual interface card file of the non-NFC intelligent terminal.

It should be noted that, at present, existing smart information terminals can push information to the dual-interface card of non-NFC smart terminals in NDEF format.

In this step, first, it is necessary to wait for the intelligent information terminal to enter the card reader state;

Then, when the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal entering the card reader state will write the push information carrying the dynamic tag into the dual interface card of the non-NFC intelligent terminal. in the file;

When the instruction received by the intelligent information terminal in the card reader state is an information query instruction and an instruction for querying information content, the intelligent information terminal queries the information in the background, and then the intelligent information terminal in the card reader state will carry a dynamic tag. The result of the query information is written into the file of the dual-interface card of the non-NFC smart terminal.

Step 402: After verifying that the carried dynamic tag is legal, the non-NFC smart terminal obtains the push information or the query information result from the dual interface card.

In this step, the intelligent terminal will display the obtained push information/query information result to the user.

It should be noted that it is the prior art to use a dual-interface card to contact a non-NFC smart terminal and an intelligent information terminal. However, the dual-interface card can only work in the card simulation mode. Data transmission method between non-intelligent terminals and intelligent information terminals.

FIG. 5 is a schematic diagram of the composition and structure of the NFC-based data transmission system of the present invention, as shown in FIG. 5 , at least including an intelligent information terminal, an intelligent terminal, and a smart card; wherein,

The intelligent information terminal is used to pass the NFC authentication with the intelligent terminal and obtain the dynamic tag through the smart card; send a transmission request carrying the dynamic tag to the smart card, and the smart card stores the dynamic tag;

The smart card is used to send a transmission request with a dynamic tag to the smart terminal;

The smart terminal is used to receive the transmission request from the smart card, verify the validity of the carried dynamic tag, and obtain the transmitted content information.

The smart terminal may be an NFC smart terminal or a non-NFC smart terminal.

When the smart terminal is an NFC smart terminal, the smart card is a SWP-NFC card; at this time,

The intelligent information terminal is specifically used for receiving the application category instruction, and sending the push information/query information result carrying the dynamic tag to the SWP-NFC card; specifically,

When the command received by the smart information terminal in the card reader state is a push command, the smart information terminal in the card simulation state will push the information to the SWP-NFC card;

When the command received by the smart information terminal in the card reader state is an information query command and a query information content command, the smart information terminal queries the information in the background, and then the smart information terminal in the card simulation state pushes the query information to the SWP-NFC card result.

The SWP-NFC card is specifically used to transmit the obtained push information/query information result carrying the dynamic tag to the NFC smart terminal.

When the smart terminal is a non-NFC smart terminal, the smart card is a dual-interface card; at this time,

The intelligent information terminal is specifically used to receive the application category instruction and enter the card reader state. The intelligent information terminal writes the push information/query information result carrying the dynamic tag to the dual-interface card file of the non-NFC intelligent terminal; specifically land,

When the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal entering the card reader state will write the push information carrying the dynamic tag into the dual interface card file of the non-NFC intelligent terminal;

When the instruction received by the intelligent information terminal in the card reader state is an information query instruction and an instruction for querying information content, the intelligent information terminal queries the information in the background, and then the intelligent information terminal in the card reader state will carry a dynamic tag. The result of the query information is written into the dual-interface card file of the non-NFC smart terminal.

Non-NFC smart terminal, specifically used to verify the legality of dynamic tags from dual-interface cards and obtain push information or query information results.

Although the embodiments disclosed in the present invention are as above, the described contents are only the embodiments adopted to facilitate the understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art to which the present invention belongs, without departing from the spirit and scope disclosed by the present invention, can make any modifications and changes in the form and details of the implementation, but the scope of the patent protection of the present invention still needs to be The scope defined by the appended claims shall prevail.

Claims (7)

1. a data transmission method based on short-range communication NFC, is characterized in that, comprises: between intelligent terminal and intelligent information terminal through NFC authentication and obtain dynamic label, wherein, described dynamic label is a kind of label based on NDEF format ; The intelligent information terminal sends a transmission request carrying the dynamic tag to the smart card, and the smart card stores the dynamic tag; The smart card sends a transmission request carrying a dynamic tag to the smart terminal; the smart terminal receives the transmission request from the smart card and verifies that the carried dynamic tag is legal, and obtains the transmitted content information according to the dynamic tag; The transmission request of the smart card and the validity of the carried dynamic label are verified by comparing whether the dynamic label that has passed the NFC authentication is consistent with the dynamic label in the transmission request received from the smart card, and if they are consistent, verifying that the carried dynamic label is legal; When the smart terminal is an NFC smart terminal, the smart card is a SWP-NFC smart card; When the transmission request is a result of pushing information/querying information, the intelligent information terminal sends a transmission request carrying a dynamic tag to the smart card, and the smart card stores the dynamic tag including: When the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal in the card simulation state pushes the information carrying the dynamic tag to the SWP-NFC card; When the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and then the intelligent information terminal in the card simulation state sends the SWP - The NFC card pushes the query information result carrying the dynamic tag; The smart card sending a transmission request carrying a dynamic label to the smart terminal includes: The SWP-NFC card transmits the obtained push information/query information result carrying the dynamic tag to the NFC smart terminal. 2. The data transmission method according to claim 1, wherein the NFC authentication between the intelligent terminal and the intelligent information terminal comprises: The smart terminal generates a random challenge code, and requests the smart card to obtain a certificate public key; The intelligent terminal encrypts the challenge code after receiving the certificate public key, and sends the encrypted challenge code information to the intelligent information terminal. The decrypted challenge code is sent to the smart terminal for verification, and if the verification is passed, it is considered to have passed the NFC authentication. 3. The data transmission method according to claim 1 or 2, wherein the smart terminal is a non-NFC smart terminal, and the smart card is a dual-interface card; The transmission request is a result of pushing information/querying information. 4. The data transmission method according to claim 3, wherein the intelligent information terminal sends a transmission request carrying a dynamic tag to the smart card, and the smart card storing the dynamic tag comprises: If the instruction received by the intelligent information terminal in the card reader state is a push instruction, the intelligent information terminal in the card reader state writes the push information carrying the dynamic tag into the dual interface of the non-NFC intelligent terminal in the file of the card; If the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and then the intelligent information terminal in the card reader state will The query information result carrying the dynamic tag is written into the file of the dual-interface card of the non-NFC smart terminal; The smart card sending a transmission request carrying a dynamic label to the smart terminal includes: The non-NFC smart terminal verifies the legality of the dynamic tag from the dual-interface card and obtains the result of push information or query information. 5. An NFC-based data transmission system, comprising at least an intelligent information terminal, an intelligent terminal, and a smart card; wherein, The smart information terminal is used to pass NFC authentication with the smart terminal and obtain the dynamic tag through the smart card; send a transmission request carrying the dynamic tag to the smart card, and the smart card stores the dynamic tag, wherein the dynamic tag is an NDEF-based format label; a smart card, used to send a transmission request carrying the dynamic tag to the smart terminal; The intelligent terminal is used for receiving the transmission request from the smart card and verifying the validity of the carried dynamic label, and obtaining the transmitted content information according to the dynamic label; wherein, the intelligent terminal receives the transmission request from the smart card and verifies the carried The validity of the dynamic label is to compare whether the dynamic label that has passed the NFC authentication is consistent with the dynamic label in the transmission request received from the smart card. If they are consistent, verify that the carried dynamic label is legal; When the smart terminal is an NFC smart terminal, the smart card is a SWP-NFC card; at this time, The intelligent information terminal is specifically configured to receive the application category instruction, and send the push information/query information result carrying the dynamic tag to the SWP-NFC card; The SWP-NFC card is specifically used to transmit the obtained push information/query information result carrying the dynamic tag to the NFC smart terminal; The intelligent information terminal is specifically used for: when the instruction received by the intelligent information terminal in the card reader state is a push instruction, and when the intelligent information terminal is in a card simulation state, send a carrying instruction to the SWP-NFC card. Push information with dynamic tags; When the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and the intelligent information terminal in the card simulation state sends the SWP-NFC The card pushes the query information result carrying the dynamic tag. 6. The data transmission system according to claim 5, wherein when the smart terminal is a non-NFC smart terminal, the smart card is a dual-interface card; at this time, The intelligent information terminal is specifically used to receive the application category instruction and enter the card reader state, and the intelligent information terminal writes the push information/query information result carrying the dynamic tag to the non-NFC smart tag in a manner based on the NDEF dynamic tag. In the dual interface card file of the terminal; The non-NFC smart terminal is specifically used to verify the legality of the dynamic tag and obtain the result of push information or query information. 7. The data transmission system according to claim 6, wherein the intelligent information terminal is specifically used for: when the instruction received by the intelligent information terminal in the card reader state is a push instruction, enter the card reader The intelligent information terminal in the state will write the push information carrying the dynamic tag into the dual interface card file of the non-NFC intelligent terminal; When the instructions received by the intelligent information terminal in the card reader state are information query instructions and information content query instructions, the intelligent information terminal queries information in the background, and the intelligent information terminal in the card reader state will carry dynamic information The query information result of the tag is written into the dual interface card file of the non-NFC smart terminal.