Abstract:
The present disclosure provides a terminal comprising: a socket configured to receive a security module; an NFC (Near Field Communication) unit configured to communicate with an external reader or another terminal; and a protocol identifying unit configured to supply a voltage to the security module and to identify whether the security module supports a first protocol by transmitting a signal for using the first protocol through a first contact of the security module and receiving from the security module a first information associated with a protocol supported by the security module, wherein the terminal additionally receives a second information associated with the protocol supported by the security module through a second contact of the security module, and wherein the NFC unit receives a information from the security module through the first contact based on the first protocol identified by the protocol identifying unit, and transmits the received information to the external reader or another terminal.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 11/514,347 filed on Sep. 1, 2006, which claims priority to Korean Patent Application No. 2005-0083564 filed on Sep. 8, 2005, both of which are hereby incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a Near Field Communication (NFC) apparatus and method that are capable of supporting security modules. More particularly, the present disclosure relates to a terminal for communications by NFC, a communication method for use with a terminal including an NFC unit, and a method for a USIM to perform communications. 
     BACKGROUND 
     The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. 
       FIG. 1  is a block diagram showing the construction of a conventional secure NFC apparatus  100 . Referring to  FIG. 1 , the secure NFC apparatus  100  includes an NFC unit  110  and the security module  120 . 
     The NFC unit  110  may be controlled by the host processor of a mobile communication terminal or the like, and it communicates with the security module  120  via signals SigIn and SigOut based on the S2C interface. The security module  120  is a kind of Subscriber Identity Module (SIM), and may store authentication information for user identification. The S2C interface was developed by Philips Electronics for the purpose of communication between the NFC unit  110  and the security module  120 . 
     The secure NFC apparatus  100  may be mounted in a portable terminal such as a mobile communication terminal. The secure NFC apparatus  100  may perform the function of a traffic card or a smart card. 
     For example, a user who attempts to pass through a security gate brings a portable terminal equipped with the secure NFC apparatus  100  close to a main body that is installed at the security gate for entry authentication, and authentication information is transmitted to the main body through the antenna  111  of the secure NFC apparatus  100  to be used for entry authentication. If the authentication is successful, the user can pass through the security gate. 
     Furthermore, a user brings the portable terminal equipped with the secure NFC apparatus  100  close to a reader for authenticating the amount of charged money, and the user can be allowed to use transportation and pay for shopping depending on whether the authentication by the reader is successful. 
     DISCLOSURE 
     Technical Problem 
     However, the prior art secure NFC apparatus  100  supports only the security module  120  that communicates with the NFC unit  110  based on the S2C interface. Therefore, in the case where other security authentication modules, such as a contact smart card core chip based on the International Standards Organization (ISO) 7816 protocol or a non-contact smart card core chip based on the ISO 14443 protocol, are used as the security module  120 , the interface specifications of the security authentication modules are not compatible with those of the NFC unit  110 . Accordingly, data associated with the modules used (for example, authentication information) is not compatible, so there is a problem in that the management of data is inconvenient. 
     Furthermore, there has been an attempt to make the NFC unit  110  receive data, such as authentication information, from the outside and the security module  120  manage the data. However, the scheme related to this attempt was not satisfactory. Furthermore, the scheme encountered difficulty in that it is difficult to manage personal information, such as electronic name cards, managed in a mobile communication terminal because the scheme does not support peer-to-peer data transmission and reception between mobile communication terminals. 
     SUMMARY 
     Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the prior art, and an object of the present disclosure is to provide A terminal comprising: a socket configured to receive a security module; an NFC (Near Field Communication) unit configured to communicate with a external reader or another terminal; and a protocol identifying unit configured to supply a voltage to the security module and to identify whether the security module supports a first protocol by transmitting a signal for using the first protocol through a first contact of the security module and receiving from the security module a first information associated with a protocol supported by the security module, wherein the terminal additionally receives a second information associated with the protocol supported by the security module through a second contact of the security module, and wherein the NFC unit receives a information from the security module through the first contact based on the first protocol identified by the protocol identifying unit, and transmits the received information to the external reader or another terminal. 
     Another embodiment of the present disclosure provides A communication method comprising: supplying a prescribed voltage to a security module; checking whether the security module supports a first protocol by transmitting a signal for using the first protocol through a first contact of the security module and receiving from the security module a first information associated with a protocol supported by the security module; receiving a second information associated with the protocol supported by the security module through a second contact of the security module; receiving a information from the security module through the first contact based on the first protocol if it is confirmed that the security module supports the first protocol; and transmitting the received information through a NFC unit to an external reader or another terminal. 
     Yet another embodiment of the present disclosure provides A communication method comprising: receiving a signal for use of a first protocol through a first contact at a USIM; transmitting a first information associated with a protocol supported by the USIM through the first contact within a time period from receiving the signal for using the first protocol; providing a second information associated with the protocol supported by the USIM through a second contact which is different from the first contact; and communicating through the first contact based on the first protocol. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       The above and other objects, features and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a block diagram showing the construction of a conventional secure NFC apparatus; 
         FIG. 2  is a block diagram showing the construction of a secure NFC apparatus according to an embodiment of the present disclosure; 
         FIG. 3  is a view showing the appearance of the chip of a security module inserted into a plug-in socket; 
         FIG. 4  is a diagram showing an example of the detailed construction of the security module of  FIG. 2 ; 
         FIG. 5  is a detailed block diagram showing the relationship between the protocol conversion unit and ISO chip of  FIG. 2 ; 
         FIG. 6  is a waveform diagram of a process in which a signal based on the S2C protocol received from an NFC unit is converted into a signal based on the ISO protocol and is then output to the security module; 
         FIG. 7  is a waveform diagram of a process in which a signal based on the ISO protocol received from the security module is converted into a signal based on the S2C protocol and is then output to the NFC unit; 
         FIG. 8  is a flowchart showing the operation of the protocol matching unit of  FIG. 2 ; 
         FIG. 9  is a diagram showing the relationship of a communication application between a mobile communication terminal equipped with the secure NFC apparatus and a reader, according to an embodiment of a present disclosure; and 
         FIG. 10  is a diagram showing the relationship of a communication application between mobile communication terminals each equipped with the secure NFC apparatus, according to an embodiment of a present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference should now be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components. 
       FIG. 2  is a block diagram showing the construction of a secure NFC apparatus  200  according to an embodiment of the present disclosure. Referring to  FIG. 2 , the NFC apparatus  200  includes an NFC unit  210 , a protocol matching unit  220 , a security module  230 , and a plug-in socket  240  into which the security module  230  is inserted. 
     The secure NFC apparatus  200  may be mounted in a portable terminal, such as a mobile communication terminal. The secure NFC apparatus  200 , as shown in  FIG. 9 , may perform the function of a traffic card or a smart card via communication with a reader. Furthermore, the present disclosure is proposed such that peers, that is, mobile communication terminals, equipped with secure NFC apparatuses  200  can exchange personal information with each other, as shown in  FIG. 10 . 
     In particular, unlike the fact that a conventional secure NFC processor supports only communication with a specific security authentication module communicating based on the S2C interface, in the present disclosure, the protocol matching unit  220  performs protocol conversion on security authentication modules that do not follow the S2C protocol when security modules  230 , such as modules that have security authentication chips and follow not only the S2C protocol of NFC but also the ISO protocols of contact smart cards based on the general ISO 7816 protocol or a non-contact smart cards based on the ISO 14443 protocol, are inserted into the socket  240  in a plug-in fashion and are compatible in NFC. 
     The NFC unit  210  is an NFC processor that performs non-contact NFC interfacing with an external reader or the NFC apparatus of a peer terminal using first and second base-band signals SigIn and SigOut based on the S2C protocol. The NFC unit  210  can operate under the control of the host processor of a mobile communication terminal equipped with the secure NFC apparatus  200 . 
     The NFC unit  210  receives the first base-band signal SigIn based on the S2C protocol from the protocol matching unit  220 , and processes the first base-band signal SigIn into information in Radio Frequency (RF) form, which corresponds to the first signal SigIn. The NFC unit  210  transmits the generated information to a reader or a peer terminal via non-contact NFC through an antenna  211 . 
     The NFC unit  210  may receive RF information from the reader or the peer terminal via NFC through the antenna  211 . The NFC unit  210  may process the received RF information, generate the second base-band signal SigOut based on the S2C protocol, and transmit the generated second signal SigOut to the protocol matching unit  220 . 
     The protocol matching unit  220  matches the protocols of the signals, which are input and output between the NFC unit  210  and the security module  230 , with each other according to a chip identification signal CIS indicating the chip type of the security module  230 . For example, in the case where the chip of the security module  230  is identified as a chip using the S2C protocol based on the chip identification signal CIS, the protocol matching unit  220  connects the two Input/Output (I/O) terminals of the NFC unit  210  with the two I/O terminals of the security module  230 , thereby bypassing the signals SigIn and SigOut based on the S2C protocol, which are respectively input to and output from the NFC unit  210  to the security module  230 , and bypassing the signals which are respectively input to and output from the security module  230  to the NFC unit  210 . Furthermore, in the case where the chip of the security module  230  is identified as the security authentication chip of a non-contact smart card based on the ISO 14443 protocol according to the chip identification signal CIS, the protocol matching unit  220  converts the signals SigIn and SigOut based on the S2C protocol, which are input to and output from the NFC unit  210 , into signals LA-LB based on the ISO protocol, which are input to and output from the security module  230 , and converts the signals LA-LB based on the ISO protocol, which are input to and output from the security module  230 , into the signals SigIn and SigOut based on the S2C protocol, which are input to and output from the NFC unit  210 , between the NFC unit  210  and the security module  230 . The generation of the chip identification signal CIS will be described in detail below. 
     The security module  230  is inserted into the socket  240  in a plug-in fashion, and may be a module having one of various authentication chips, such as a security authentication chip following the S2C protocol of NFC, the core chip of a contact smart card following the general ISO 7816 protocol or the core chip of a non-contact smart card following the ISO 14443 protocol. In particular, in the case where the security module  230  has the core chip of the non-contact smart card following the ISO 14443 protocol, the security module  230  operates in response to the signals LA-LB input to and output from the chip and can output authentication information stored therein to terminals LA-LB. The appearance of the chip in the security module  230  inserted into the plug-in socket  240  may follow that of a module having the core chip of a contact smart card following the ISO 7816 protocol, as shown in  FIG. 3 . In this case, the security module  230  may have eight external pins connected to the internal circuit of the chip. Accordingly, a plug-in socket corresponding to the chip specifications of the contact smart card based on the ISO 7816 protocol is used as the socket  240  into which the security module  230  is inserted. 
     In general, in the core chip of the contact smart card based on the ISO 7816 protocol, pins Nos.  1 ,  2 ,  3 ,  5 , and  7  are used, while in the present disclosure, pins Nos.  4  and  8  may be used as the I/O signal (SigIn and SigOut) pins of the security authentication chip following the S2C protocol of NFC, which may be inserted as the security module  230 , or the I/O signal (LA-LB) pins of the core chip of the non-contact smart card following the general ISO 14443 protocol. Furthermore, pin No.  6  may be used as a Contactless Appearance Detection (CLAD) signal pin that is used to detect whether a chip is a non-contact chip. 
       FIG. 4  is a diagram showing an example of the detailed construction of the security module  230  of  FIG. 2 . Referring to  FIG. 4 , the security module  230  may include a Central Processing Unit (CPU)  231 , Read-Only Memory (ROM)  232 , Random Access Memory (RAM)  233 , and Electrically Erasable Programmable ROM (EEPROM  234 ). The CPU  231  is responsible for the overall control of the security module  230 . The ROM  232  stores an overall system program for the operation of the security module  230 . The RAM  233  stores temporary data necessary at the time of operation of internal data. The EEPROM  234  stores authentication information for transmission and reception in conjunction with an external card reader or other terminals. 
     In  FIG. 2 , the protocol matching unit  220  includes a selection unit  221 , a chip identification unit  222 , and a protocol conversion unit  223 . 
     The chip identification unit  222  transmits a request signal to the security module  230 , and generates a chip identification signal CIS in response to a signal received in response to the request signal. In the case where the security module  230  is identified as a module having a chip based on the S2C protocol according to the chip identification signal CIS, the selection unit  221  bypasses the signals SigIn and SigOut based on the S2C protocol, which are input to and output from the NFC unit  210 , to the security module  230 . In the case where the security module  230  is identified as a module having a chip based on the ISO protocol according to the chip identification signal CIS, the selection unit  221  outputs the signals SigIn and SigOut based on the S2C protocol, which are input to and output from the NFC unit  210 , to the protocol conversion unit  223  as signals for protocol conversion. Accordingly, in the case where the security module  230  is identified as a module having a chip based on the ISO protocol according to the chip identification signal CIS, the protocol conversion unit  223  performs protocol conversion such that the signals SigIn and SigOut based on the S2C protocol for the protocol conversion, which are output from the selection unit  221 , are compatible with the signals LA-LB input to and output from the security module  230 . 
     A detailed block diagram showing the relationship between the protocol conversion unit  223  of  FIG. 2  and a chip based on the ISO protocol, which is inserted into the security module  230 , when the protocol conversion unit  223  performs the protocol conversion is shown in  FIG. 5 . Referring to  FIG. 5 , the protocol conversion unit  223  includes a signal conversion unit  223 - 1  and a waveform shaping unit  223 - 2 . 
     The signal conversion unit  223 - 1  performs protocol conversion such that Miller coded signals based on the S2C protocol are compatible with Manchester coded signals based on the ISO protocol. 
     For example, the signal SigOut based on the S2C protocol, which is received from the NFC unit  210 , is a digital signal coded using Miller coding, as shown in the lower view of  FIG. 6 . An analog signal LAA-LBB, which is generated by the signal conversion unit  223 - 1  and output to the waveform shaping unit  223 - 2 , is a signal that is modulated and coded using Manchester coding, as shown in the upper view of  FIG. 6 . As shown in  FIG. 6 , the signal conversion unit  223 - 1  converts the signal SigOut coded using Miller coding into an analog signal having a constant frequency peak-to-peak level according to the logic states of the Miller coded signal SigOut. In other words, the signal conversion unit  223 - 1  converts a digital signal having a high logic state into an analog signal having a high peak-to-peak level, and converts a digital signal having a low logic state into an analog signal having a low peak-to-peak level. The digital code based on Miller coding is based on a coding scheme in which a signal having a low logic state at the initial part of a constant period is considered to be “0” and a signal having a low logic state at the intermediate part of a constant period is considered to be “1”, as shown in  FIG. 6 . The signal based on Manchester coding is based on a coding scheme in which a digital value based on Miller coding is modulated to a subcarrier type, as shown in  FIG. 6 . 
     The waveform shaping unit  223 - 2  performs waveform shaping such that the analog signal LA-LB output to the security module  230  is greater than the analog signal LAA-LBB output to the signal conversion unit  223 - 1  between the signal conversion unit  223 - 1  and the security module  230 . 
     In a similar way, the analog signal LA-LB output from the security module  230  is a digital signal, which is modulated and coded using Manchester coding, as shown in the lower view of  FIG. 7 . The analog signal LA-LB is waveform-shaped into the signal LAA-LBB by the waveform shaping unit  223 - 2 , and is then converted into the signal SigIn based on the S2C protocol by the signal conversion unit  223 - 1 . 
     In  FIG. 5 , the waveform shaping unit  223 - 2  includes a first resistor R 1 , a second resistor R 2 , a first diode D 1 , a second diode D 2 , a first capacitor C 1 , a second capacitor C 2 , a third capacitor C 3 , a fourth capacitor C 4 , and an inductor L 1 . The circuit of  FIG. 5  showing the waveform shaping unit  223 - 2  is only an example, therefore one of various circuits for waveform shaping may be used. The first resistor R 1  is connected between a first terminal LS and a second terminal LAA, which are connected to the signal conversion unit  223 - 1 . The first capacitor C 1  is connected between the second terminal LAA, which is connected to the signal conversion unit  223 - 1 , and a first node ND 1 . The second resistor R 2  is connected between the first node ND 1  and a ground GND. The second capacitor C 2  is connected between the first node ND 1  and the ground GND. The first diode D 1  is connected between the first node ND 1  and a second node ND 2 . The second diode D 2  is connected between the second node ND 2  and the ground GND. The third capacitor C 3  is connected between a first terminal LA and a second terminal LB, which are connected to the security module  230 . The fourth capacitor C 4  is connected between the first terminal LA, which is connected to the security module  230 , and the second node ND 2 . The inductor L 1  is connected between a third terminal LBB, which is connected to the signal conversion unit  223 - 1 , and the first terminal LA, which is connected to the security module  230 . 
     In the case where the protocol converted signals are input to and output from the security module  230 , the signal conversion unit  223 - 1  turns on a switch SW, so the ground GND is applied to the second terminal LB, which is connected to the security module  230 , to operate the waveform shaping unit  223 - 2 . 
     Accordingly, the signals LA-LB via the terminals connected to the security module  230  are decreased in size by the waveform shaping unit  223 - 2  and then output to the signal conversion unit  223 - 1 , and the signals LAA-LBB from the signal conversion unit  223 - 1  are increased in size by the waveform shaping unit  223 - 2  and then output to the security module  230 , through the general operation of the first diode D 1  and second diode D 2  of the waveform shaping unit  223 - 2  and the R-C filter (R 2 , C 2 ) circuit operation of the waveform shaping unit  223 - 2 . For example, the signals LAA-LBB output to the signal conversion unit  223 - 1  may have a peak-to-peak level of about  3  V and the signals LA-LB output to the security module  230  may have a peak-to-peak level of about 12 to 13 V. 
     The operation of the protocol matching unit  220  is described in more detail below with reference to the flowchart of  FIG. 8 . 
     When power is supplied to the protocol matching unit  220 , a voltage is transferred to the security module  230  and the security module  230  enters an operating state at step S 810  of  FIG. 8 . In this initial state, the chip identification unit  222  first assumes that the security module  230  has a chip based on the S2C protocol and then transmits a request signal (REQA: Request A) (for example, 0x26 in the hexadecimal system) based on the S2C protocol to the SigOut (or the terminal LA) terminal of the security module  230  at step S 820  of  FIG. 8 . The chip identification unit  222  then determines whether a response signal (ATQA: Answer to Request A) (for example, 0403 in the hexadecimal system) based on the S2C protocol has been received from the SigIn terminal (or the terminal LB) of the security module  230  within a predetermined time (for example, 5 msec) at step S 830  of  FIG. 8 . If the response signal ATQA has been received, the chip identification unit  222  generates a chip identification signal CIS indicating that the security module  230  is a module having a chip based on the S2C protocol. The chip identification signal CIS may be output in a low logic state. If the chip identification signal CIS is output in a low logic state, the selection unit  221  directly connects the NFC unit  210  with the chip based on the S2C protocol, which is inserted as the security module  230 , and bypasses the signals SigIn and SigOut based on the S2C protocol, which are input to and output from the NFC unit  210 , to the security module  230  at step S 840  of  FIG. 8 . 
     In contrast, if the response signal ATQA based on the S2C protocol has not been received at step S 830 , the chip identification unit  222  assumes that the security module  230  has a chip based on the ISO protocol and transmits a request signal REQA (for example, 0x26 in a hexadecimal system) based on the ISO protocol to the LA-LB terminals (or the SigIn and SigOut terminals) of the security module  230  at step S 850  of  FIG. 8 . The chip identification unit  222  then determines whether the response signal ATQA (for example, 0403 in a hexadecimal system) based on the ISO protocol has been received from the LA-LB terminals (or the SigIn and SigOut terminals) of the security module  230  within a predetermined time (for example, 5 msec) after the request signal REQA has been transmitted at step S 860  of  FIG. 8 . If the response signal ATQA has been received, the chip identification unit  222  generates a chip identification signal CIS indicating that the security module  230  is a module having a chip based on the ISO protocol. The chip identification signal CIS may be output in a high logic state. In the case where the chip identification signal CIS is output in a high logic state, the selection unit  221  outputs the signals SigIn and SigOut based on the S2C protocol to the protocol conversion unit  223  to perform protocol conversion that allows the signals SigIn and SigOut based on the S2C protocol, which are input to and output from the NFC unit  210 , to be compatible with the signal LA-LB based on the ISO protocol, which is input to and output from the security module  230 , thereby allowing communication between the NFC unit  210  and the chip based on the ISO protocol, which is inserted as the security module  230 . Accordingly, the protocol conversion unit  223  performs protocol conversion so that the signals SigIn and SigOut based on the S2C protocol for the protocol conversion are compatible with the signal LA-LB input to and output from the security module  230  at step S 870  of  FIG. 8 . 
     As described above, the chip identification unit  222  first determines whether the security module  230  is a module having a chip based on the S2C protocol. The reason for this is that the chip identification unit  222  has a digital peak-to-peak level of 3 to 5 V based on the Miller coding when it transmits the request signal REQA based on the S2C protocol and receives the response signal ATQA through the terminals SigIn and SigOut (or the terminals LA and LB) of the security module  230 , but has an analog peak-to-peak level of 12 to 13 V based on the Manchester coding when it transmits the request signal REQA based on the ISO protocol to the security module  230  and receives the response signal ATQA. As described above, damage to circuits due to the application of a high voltage to the security module  230  can be prevented in such a way as to determine whether the security module  230  operates at a low voltage (that is, it operates in accordance with the S2C protocol). 
     Meanwhile, the secure NFC apparatus  200  according to an embodiment of the present disclosure, which is shown in  FIG. 2 , may be mounted in a mobile communication terminal and communicate with a reader, as shown in  FIG. 9 . 
     For example, a user who desires to pass through a security gate can transmit authentication information to a reader for entry authentication through the antenna  211  of the secure NFC apparatus  200  by bringing the mobile communication terminal equipped with the secure NFC apparatus  200  close to a main body (that is, the reader) mounted in the security gate for entry authentication. 
     That is, when information requesting authentication is received from the reader through the antenna  211  of the secure NFC apparatus  200 , information based on a received signal can be transmitted to the security module  230  through the NFC unit  210  and the protocol matching unit  220 . In this case, the security module  230  extracts authentication information, such as a user Identification (ID) for user identification, stored in the EEPROM  234  under the control of the CPU  231 . The extracted authentication information can be transmitted to the reader through the protocol matching unit  220  and the NFC unit  210 . If corresponding authentication is successful in the reader, the user can pass through the security gate. 
     Furthermore, in the case where a reader for transportation or payment is used, a user brings a mobile communication terminal equipped with the secure NFC apparatus  200  close to the reader, and can use transportation or pay the cost if the authentication of the amount of charged money is successful in the reader. 
     Furthermore, the secure NFC apparatus  200  according to an embodiment of the present disclosure, which is shown in  FIG. 2 , can be mounted in different mobile communication terminals and enable peer-to-peer communication, as shown in  FIG. 10 . 
     For example, currently many users store electronic name cards, photos, motion images, and/or telephone directories in their mobile communication terminals, and then use them. However, only when such personal information is input again or downloaded when terminals are changed can users use personal information, which was stored in previous terminals, in current terminals. 
     However, in the present embodiment, such personal information can be managed in the security module  230  of the secure NFC apparatus  200  mounted in the mobile communication terminal. When personal information is managed in the security module  230 , it is possible to move the personal information to a peer terminal through communication between mobile communication terminals. 
     For example, mobile communication terminals equipped with the secure NFC apparatus  200  are brought close to each other, and one of the mobile communication terminals attempting to transmit personal information can send the personal information, along with authentication information, to the other mobile communication terminal through the antenna  211  of the secure NFC apparatus  200 . When the other mobile communication terminal receives the authentication information and the personal information through the antenna  211  of the secure NFC apparatus  200 , the other mobile communication terminal can transmit information based on received signals to the security module  230  through the NFC unit  210  and the protocol matching unit  220 . In this case, the security module  230  can perform authentication under the control of the CPU  231 , store the personal information included in the received signals in the EEPROM  234  if the authentication is successful, and manage the stored personal information. 
     As described above, in the secure NFC apparatus  200  according to the present disclosure, the protocol matching unit  220  identifies the type of the chip in the security module  230 , which is inserted in a plug-in fashion, generates a chip identification signal CIS according to the results of the identification, and matches the protocol of the signals SigIn and SigOut based on the S2C protocol, which are input to and output from the NFC unit  210 , with the protocol of the signals LA-LB, which are input to and output from the security module  230 , according to the chip identification signal CIS. 
     The secure NFC method according to an embodiment of the present disclosure may be implemented in program instruction form that can be executed through a variety of computer means, and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, a data structure or a combination thereof. The program instructions recorded in the computer-readable medium may be specially designed and constructed for the present disclosure, or be well known to those skilled in the field of computer software. Examples of the computer-readable recording medium include magnetic media such as a hard disk, a floppy disk and a magnetic tape, optical media such as Compact Disk (CD)-ROM and a Digital Versatile Disk (DVD), magneto-optical media such as a floptical disk, and hardware devices such as ROM, RAM and flash memory, that are specially designed to store and execute program instructions. The computer-readable medium may be a transmission medium, such as light including a carrier that transmits signals designating program instructions or data structures, a metallic line, or a waveguide. Examples of the program instructions include not only machine language code constructed by a compiler but also high level language code executable by a computer via an interpreter. The hardware devices may be constructed to act as one or more software modules for performing the operation of the present disclosure, and vice versa. 
     As described above, in the secure NFC apparatus according to the present disclosure, signals based on the S2C protocol of NFC are selectively converted into signals suitable for the protocol of another a security authentication module. Therefore, the secure NFC apparatus of the present disclosure can support not only a security authentication module based on the S2C protocol but also a variety of security authentication modules, such as general contact/non-contact smart cards, which are inserted into the socket in a plug-in fashion. Accordingly, the present disclosure is advantageous in that user authentication information managed in various security authentication modules can be used in an easily compatible fashion. 
     Furthermore, the present disclosure is advantageous in that data communication between portable terminals (that is, peers), such as mobile communication terminals, is freely performed, therefore personal information, such as electronic name cards, photos, moving images, and telephone directories, can be easily managed. 
     Although the specific embodiments of the present disclosure have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the disclosure as disclosed in the accompanying claims.