KR20060088628A - Smart card read/write system and read/write method - Google Patents

Abstract

The present invention relates to a communication structure for writing and reading data on a smart card. The smart card read / write system according to the present invention transmits protocol header information and transmits data when response confirmation information is received; A smart card for interpreting the received protocol header information to transmit the response confirmation information and to receive and record the data; And receiving the protocol header information from the host processor and transmitting the received protocol header information to the smart card, receiving the response confirmation information from the smart card and transmitting the received response information to the host processor, and receiving the data from the host processor and transmitting the data to the smart card. It characterized in that it comprises a smart card controller for transmitting.

According to the present invention, when an abnormality occurs in data transmission, it is possible to easily find a problem by making a debugging point and to simplify the protocol for error correction. In addition, according to the present invention, there is an effect that can ensure a higher reliability in writing data to the smart card or read data.

Description

Smart card read / write system and read / write method}

1 is a data flow diagram showing the operation of each component of the conventional smart card read / write system and the data flow according thereto.

Figure 2 is a block diagram schematically showing the overall configuration of the smart card read / write system according to an embodiment of the present invention.

3 is a data block diagram schematically showing the overall structure of a command APDU used in a smart card read / write system according to an embodiment of the present invention.

4 is a data block diagram schematically showing the overall structure of a response APDU used in a smart card read / write system according to an embodiment of the present invention.

FIG. 5 is a data block diagram illustrating some structures of system header information used in a smart card read / write system according to an embodiment of the present invention. FIG.

6 is a flowchart illustrating a smart card read / write method according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

100: smart card lead / light system

110: host processor 120: smart card controller

122: host interface 124: controller control unit

126: controller memory 128: card interface

130: smart card 132: card control unit

134: auxiliary operation unit 136: card memory

138: I / O

The present invention relates to a smart card read / write system.

Currently, user authentication has emerged as an important issue in terms of the development of information and communication technologies, various network technologies including mobile communication terminals, and electronic commerce.

In particular, the problem of complicated procedures for user authentication and the stealing of personal information has become a subject of technical interest. As a means of solving such a problem, smart cards have been proposed.

The smart card has a function of transmitting / receiving / processing and storing information by mounting a microprocessor and a memory. Also, the smart card is equipped with a dedicated processor for processing encryption algorithms such as symmetrical / asymmetric keys and has high security. Authentication can be performed.

These smart cards are used in many fields, such as credit cards, hospital authentication cards, transportation cards, IMT-2000 cards, etc. Recently, due to the commercialization of DMB (Digital Multimedia Broadcasting) technology, the user's authentication of DMB receivers The use of smart cards is under consideration.

For example, a conditional access system (CAS) applied to a DMB phone is a system that authorizes or restricts a user to receive paid broadcasting and additional services, and authenticates a user who has paid a fee for use. .

That is, when a content provider encrypts broadcast content and transmits it to a DMB phone via satellite or terrestrial wave, the DMB phone is authorized to process the authentication data and decrypt the password. The smart card may be utilized.

When CAS technology is combined with DMB technology, various business models such as individual program viewing (PPV), video on demand (VOD), T commerce, and target marketing are possible, which can lead to more active e-commerce.

As described above, in order to develop CAS technology using a smart card, a task of writing and reading data on a smart card should be preceded. Looking at a system for reading / writing data to a conventional smart card is as follows.

1 is a data flow diagram showing the operation of each component of the conventional smart card read / write system and the data flow according thereto.

Referring to FIG. 1, a general smart card read / write system mainly includes a host processor 10, a smart card controller 20, and a smart card 30.

First, when the host processor 10 is requested to record the data to the smart card by the application program module (S10), the command APDU including the system header, APDU (Application Protocol Data Unit) header, data and error detection information Transmission to the smart card controller 20 (S11).

The smart card controller 20 transmits the APDU header to the smart card 30 (S12), the smart card 30 interprets the APDU header (S13) and generates response confirmation information (ACK) to the smart card controller Transfer to step 20 (S14).

Subsequently, the smart card controller 20 transmits data to the smart card 30 (S15), and the smart card 30 records the transmitted data in its memory (S16).

After the recording is finished, the smart card 30 generates return code information SW1 and SW2 and transmits it to the smart card controller 20 (S17). Finally, the smart card controller 20 returns the transmitted. The code information, the system header, and the error detection information are transmitted to the host processor 10 (S18).

Here, the smart card controller 20 performs an intermediary function of receiving a series of APDUs from the host processor 10 and delivering them to the smart card 30. The smart card controller 20 responds from the smart card 30. When the confirmation information is received, the data stored in its memory is directly transmitted to the smart card 30 without informing the host processor 10 of the confirmation information.

Therefore, the host processor 10 is in an environment in which the smart card 30 is not directly controlled.

That is, since the host processor 10 cannot check the response confirmation information of the smart card 30, there is a problem in that the system header, the APDU header, the data, and the error detection information cannot be debugged when the information is incorrectly delivered.

The data lead / write structure of such a smart card can be pointed out as an important defect in the reliability of data in terms of being used for billing and user authentication, and it can be said to be a prerequisite for integrating CAS technology into DMB technology. .

Accordingly, the present invention breaks the conventional structure in which the host processor transmits a series of APDUs to the smart card controller and the smart card controller controls data read / write to the smart card, thereby allowing the host processor to provide information between the smart card controller and the smart card. An object of the present invention is to provide a smart card read / write system that can directly control transmission of information.

In addition, the present invention provides a smart card read / write method for reading / writing data to a smart card through a smart card controller, in which a host processor can easily create a debugging point and find a problem when data is incorrectly transferred. To provide for other purposes.

In order to achieve the above object, the smart card read / write system according to the present invention transmits the protocol header information, the host processor for transmitting data when the response confirmation information is received; A smart card for interpreting the received protocol header information to transmit the response confirmation information and to receive and record the data; And receiving the protocol header information from the host processor and transmitting the received protocol header information to the smart card, receiving the response confirmation information from the smart card, and transmitting the received response confirmation information to the host processor, and receiving the data from the host processor. It characterized in that it comprises a smart card controller for transferring to the card.

In order to achieve the above object, the smart card read / write method according to the present invention comprises the steps of: a host processor for transmitting protocol header information and the smart card controller for transmitting the transmitted protocol header information to a smart card; The smart card interprets the transmitted protocol header information, generates and transmits response confirmation information, and the smart card controller forwards the transmitted response confirmation information to the host processor; And when the response confirmation information is transmitted, the host processor transmits data, and the smart card controller transmits the transmitted data to the smart card.

Hereinafter, a smart card read / write system and a read / write method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram schematically showing the overall configuration of the smart card read / write system 100 according to an embodiment of the present invention.

Referring to FIG. 2, the smart card read / write system 100 according to an embodiment of the present invention is composed of a host processor 110, a smart card controller 120, and a smart card 130. The smart card controller ( 120 is composed of a host interface 122, a card interface 128, a controller control unit 124 and a controller memory 126, the smart card 130 is a card control unit 132, card memory 136, It consists of an input / output (I / O) 138 and an auxiliary operation unit 134.

The host processor 110 refers to a processor, such as a CPU of a device such as a DMB phone using the smart card 130, the host processor 110 according to the present invention is the smart card controller 120 Through the data lead / write of the smart card 130 can be directly controlled.

The host processor 110 communicates with the smart card controller 120 to allow the smart card 130 to record the transmitted data. Unlike the related art, the host processor 110 transmits and receives data over several times. The controller 120 and the smart card 130 can be controlled.

On the other hand, the information transmitted and received and analyzed by the host processor 110 includes system header information, APDU header information, data, response confirmation information, error detection information, return code information, and the like. do.

First, the APDU header information is a communication protocol required for recording or reading data on the smart card 130, and has a structure for giving a command to the smart card 130 and receiving a response.

An APDU including the APDU header information, data, and return code information is described below.

3 is a data block diagram schematically showing the overall structure of a command APDU used in the smart card read / write system 100 according to an embodiment of the present invention.

According to Figure 3, the command APDU is largely divided into a header and a body, the header is composed of CLA (a1), INS (a2), P1 (a3) and P2 (a4), the body is Lc (a5), Data a6 and Le (a7).

The CLA (a1) indicates the type of device that the smart card 130 will be used, for example, code "AOH" means that the smart card 130 is used for GSM (Global Systems for Mobile) phones. The INS (a2) indicates a command code. For example, the INS (a2) may instruct the smart card 130 to read or write data.

P1 (a3) and P2 (a4) are data blocks for reference, Lc (a5) represents the size of command data, and Le (a7) represents the size of response data. The data means data recorded in the smart card 130.

4 is a data block diagram schematically illustrating the overall structure of a response APDU used in the smart card read / write system 100 according to an embodiment of the present invention.

According to Figure 4, the response APDU is largely composed of a body and a trailer (trailer), the body contains the response data (b1), the trailer means SW1 (b2) / SW2 (b3). The SW1 (b2) / SW2 (b3) is a return code for the command, indicating whether or not the command was performed as directed, for example, "9000H" if the command was performed as directed, otherwise The corresponding code is displayed.

Second, the system header information contains transmission information for transmitting data to the smart card controller 120 by the host processor 110.

 5 is a data block diagram exemplarily illustrating a partial structure of system header information used in the smart card read / write system 100 according to an exemplary embodiment of the present invention.

The system header information is generally composed of 4 bytes in total, and the structure of the first 1 byte is shown in FIG. The first 1 byte is divided into an ACK block (c1), a block (c2) indicating the data length, and a block (c3) containing the command data, and the ACK block (c1) is 1 bit and the host processor 110 as one bit. Means confirmation information whether the transmission and reception between the smart card controller 120 is well made.

Further, the block c2 indicating the data length is composed of two bits, and the instruction data block c3 is composed of five bits.

Third, the response confirmation information is information for confirming whether or not the smart card 130 has received data correctly. Each component of the host processor 110, the smart card controller 120, and the smart card 130 is provided. Is transmitted and received between

Fourth, the error detection information is information used for communication between the host processor 110 and the smart card controller 120 together with the system header information. The error detection information is a data block for determining whether an error has occurred while data is transmitted. .

It is preferable that LRC (Longtitudinal Redundancy Check) is used as the error detection information (hereinafter, the error detection information is referred to as "LRC"). The LRC is data transmitted after the entire data block is transmitted and includes parity related to the length of information.

Therefore, whenever the host processor 110 and the smart card controller 120 receive mutual data, the host processor 110 and the smart card controller 120 check whether an error occurs using the LRC.

On the other hand, the smart card controller 120, the host interface 122 performs the communication with the host processor 110, is usually connected to RS-232 in charge of serial communication, the card interface 128 ) Is connected in parallel with the smart card 130 is responsible for a half-duplex (Asynchronous half deuplex mode) communication.

The controller controller 124 interlocks the host interface 122 and the card interface 128 to control transmission and reception of data, and provides a clock and a reset signal to the smart card 130 to be driven. The controller memory 126 is a space for storing data transmitted and received with the host processor 110 and the smart card 130.

In addition, the smart card 130 has a form of a plastic card in which a single integrated circuit (IC) chip is embedded. As described above, the single IC chip includes a card memory 136, a card controller 132, and an I / O. 138 and the auxiliary operation unit 134 are built in.

The I / O 138 is provided with a contact terminal that receives power and transmits and receives a signal, and is connected to the card controller 132, and the card controller 132 controls communication with the smart card controller 120. .

The card controller 132 records data in the card memory according to the command of the host processor 110. Not only data is recorded in the memory but also an operating system for driving the card controller 132 is mounted.

The auxiliary operation unit 134 may share the function of the card control unit 132, for example, may be used as a dedicated processor for encryption processing.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the smart card read / write method according to an embodiment of the present invention.

6 is a flowchart illustrating a smart card read / write method according to an embodiment of the present invention.

Referring to FIG. 6, when the host processor 110 receives a request for data recording from the application installed in the DMB phone to the smart card 130 (S100), the system configures the system header information, the APDU header information, and the LRC. The smart card controller 120 transmits the APDU header information to the smart card 130 by checking the system header and the LRC (S105).

The smart card 130, which has received the APDU header information, analyzes the device information and the command code included in the APDU header information (S120) and transmits response confirmation information if there is no error (S125).

Here, if no abnormality is found in the APDU header information, an ACK code is transmitted as response acknowledgment information, whereas if an error occurs in transmission, NAK (Negative ACK) is transmitted as response acknowledgment information.

The host processor 110 retransmits the APDU header information when the NAK code is transmitted from the smart card 130 through the smart card controller 120 or when the ACK code is not received for a predetermined time.

The smart card controller 120 transmits the transmitted ACK code to the host processor 110, and transmits the system header information and the LRC together (S130).

When the ACK code, the system header information and the LRC are transmitted, the host processor 110 confirms that the APDU header information is transmitted to the smart card 130 through the smart card controller 120 without abnormality (S135), and the system header again. Attaching the information and the LRC transmits the data to be recorded in the smart card 130 to the smart card controller 120 (S140).

The smart card controller 120 checks the system header information and the LRC (S145) and transmits the data to the smart card 130 (S150).

Subsequently, the smart card 130 records the transferred data in the card memory 136 (S155), and the data may include billing information for content use.

When the recording is completed, the smart card 130 generates the return code information (SW1 / SW2) indicating that the command was performed without abnormality and transmits to the smart card controller 120 (S160), the smart card controller 120 The transfers it to the host processor 110 (S170).

In this case, the smart card controller 120 transfers the system header information and the LRC together with the return code information as described above.

Finally, the host processor 110 interprets the return code information, the system header information and the LRC from the smart card controller 120 (S175). The communication with the smart card controller 120 is terminated (S180).

The present invention has been described above with reference to its preferred embodiments, which are merely examples and are not intended to limit the present invention, and those skilled in the art to which the present invention pertains should not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and applications are not possible that are not illustrated above. For example, each component specifically shown in the embodiment of the present invention can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

According to the smart card read / write system according to the present invention, since the host processor can check the response confirmation information of the smart card every transmission, when an abnormality occurs in the data transmission it is possible to easily find the problem by making a debugging point It works.

In addition, according to the present invention, when an error occurs in the data transmission can be corrected in real time, there is an effect that can simplify the protocol for error correction.

In addition, according to the present invention, since high reliability is secured in writing data to or reading data from a smart card, a foundation for integrating CAS technology into a wider range of e-commerce technologies is provided. It has an inducible effect.

Claims (13)

A host processor transmitting protocol header information and transmitting data when response acknowledgment information is received; A smart card for interpreting the received protocol header information to transmit the response confirmation information and to receive and record the data; And Receives the protocol header information from the host processor and transfers the protocol header information to the smart card, receives the response confirmation information from the smart card and transfers the received data to the host processor. Smart card lead / light system, characterized in that it comprises a smart card controller. The method of claim 1, wherein the host processor In transmitting the protocol header information or the data, the smart card read / write system, characterized in that for transmitting along with the system header information. The method of claim 1, wherein the host processor In transmitting the protocol header information or the data, smart card read / write system, characterized in that for transmitting the transmission error detection information together. The method of claim 1, wherein the smart card controller In transmitting the response confirmation information, smart card lead / write system, characterized in that for transmitting along with the system header information. The method of claim 1, wherein the smart card controller In transmitting the response confirmation information, smart card lead / write system, characterized in that for transmitting the transmission error detection information together. The method of claim 1, The smart card records the transmitted data and transmits return code information to the smart card controller. The smart card controller delivers the received return code information to the host processor. The smart card controller of claim 6, wherein In transmitting the return code information, smart card lead / write system, characterized in that for transmitting along with the system header information. The smart card controller of claim 6, wherein In transmitting the return code information, smart card read / write system, characterized in that for transmitting the transmission error detection information together. The method of claim 1, wherein the protocol header information Smart card lead / light system, characterized in that it comprises a command code and the device information that the smart card is used. The method of claim 1 wherein the protocol is Smart card read / write system, characterized in that the APDU (Application Protocol Data Unit) protocol. A method for reading / writing data on a host processor, smart card controller, and smart card, The host processor transmitting protocol header information and the smart card controller transferring the transmitted protocol header information to the smart card; The smart card interprets the transmitted protocol header information, generates and transmits response confirmation information, and the smart card controller forwards the transmitted response confirmation information to the host processor; And And the host processor transmits data when the response acknowledgment information is transmitted, and the smart card controller transmits the transmitted data to the smart card. The method of claim 11, The smart card records the data transmitted from the smart card controller, generates and transmits return code information, and the smart card controller further includes transmitting the transmitted return code information to the host processor. Smart card lead / light method. The method of claim 12, The host processor further comprises the step of terminating the communication with the smart card controller by interpreting the return code information when the return code information is transmitted from the smart card controller.

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