JP2010122877A - Ic card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an IC card which can specify a target file and correctly execute a receiving command message which the IC card has received, while shortening processing time required for data processing in an IC chip built in the IC card. <P>SOLUTION: An operating system of the IC card records information about a plurality of storing message groups comprising a pair of storing command messages and a storing response message in a predetermined area of a rewritable nonvolatile memory in the IC chip, gives ranking to them and makes them have a function to perform counting of these numbers. Furthermore, when comparing the receiving command message with the storing command message and they disagree, after interpreting and executing the content one by one from the storing command messages of the first rank storing message group, the operating system finally performs execution processing of the receiving command message as the disagreement. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data processing technique for an IC card, and more particularly to an IC card in which a processing time required for data processing is shortened.

  When an IC card communicates with a host device, it is very effective for a user who uses an IC card or a business operator who provides an IC card system to realize an IC card with good responsiveness. In particular, the technology for speeding up the data processing in the IC chip built in the IC card and reducing the processing time is an effective means for increasing the communication speed between the host device and the IC card. Many techniques for shortening the processing time required for such data processing have been proposed.

  For example, in Patent Document 1, in order to speed up the execution of an instruction using the contents of data processed by an instruction in the past, the operation input and the result data for each executed instruction, the reading / writing of the main memory Prepare a history memory to store addresses and data, etc., refer to the history memory when executing the same instruction again, and if the history remains, compare the current input data with the history data in the case of an operation instruction. In the case of a read / write command, the current read / write data and the address are compared with the history, and if they are the same, the execution of the operation is skipped and the result data of the history storage is used as the current result, By skipping the current read / write, speeding up can be achieved, thereby reducing the number of pipeline stages required to execute each instruction. Since the time is reduced and unnecessary load / store operations on memory are suppressed, the load of storage management such as cache control and address translation can be reduced, and the average execution time of load / store instructions can be reduced. The technology is disclosed.

  Further, in Patent Document 2, in order to speculatively execute a subsequent instruction having a data dependency, an original arithmetic unit is not used and a past instruction execution result is directly used as an instruction in order to avoid an arithmetic unit conflict. A technique has been disclosed in which a history calculator that outputs the execution result of the instruction and an instruction issue circuit that issues an instruction whose operand is the same as the past value to the history calculator is provided, and the processing time is reduced by omitting speculative execution itself. Yes.

  Further, in Patent Document 3, when a command string having a specific pattern is recognized, a command string issued from the host apparatus is predicted to operate, thereby reducing the processing time required for the corresponding process as viewed from the host apparatus. The technology to do is disclosed.

International Publication WO98 / 11484 Pamphlet International publication WO99 / 45463 pamphlet Japanese Patent Laid-Open No. 10-187578

  In general, an IC card contains an IC chip having at least a CPU and a memory device. The memory device includes a ROM that is a read-only nonvolatile memory, an EEPROM that is a rewritable nonvolatile memory, and a RAM that is a rewritable volatile memory. Usually, an operating system is mounted on the ROM, application programs and user data are mounted and stored on the EEPROM, and the RAM is used as a work area for data processing.

  The IC card exchanges information with a host device, for example, a computer externally connected to a reader / writer, or a reader / writer with a built-in MPU or the like. Information is exchanged using a contact method in which each contact terminal is physically coupled, or a non-contact communication method using wireless or the like.

  When the IC card is a multi-application type IC card that can execute a plurality of applications, the EEPROM has a plurality of application programs or application data, and the ROM has a plurality of applications. The operating system corresponding to the application is installed.

  The operating system mounted on the multi-application type IC card has functions for managing each application, managing data, interpreting and executing the contents of command messages sent from the host device, and controlling the entire data processing. Prepare. Normally, a command message received by the IC card is selected and executed based on a command table recorded in a ROM in the IC chip of the IC card.

  The exchange of information between the host device and the IC card is performed by sending a command message from the host device to the IC card, and sending a response message from the IC card to the host device as a response to this command message. It is executed by replying. Normally, communication between the host device and the IC card is established by repeatedly executing such various command message and response message transmission / reception processes.

  FIG. 14 is a schematic diagram illustrating an example of a sequence for executing transmission / reception of a command message and a response message in communication between the host device and the IC card. In FIG. 14, for example, a multi-application type IC card capable of executing a plurality of applications communicates with a host device, and the host device activates the IC card to select any of the plurality of applications. This shows a process from selecting an application, authenticating with a verification key, and reading ID data of an arbitrary file stored in a predetermined area of the rewritable nonvolatile memory in the IC card.

  In FIG. 14, first, the higher-level device transmits an activation command message to the IC card. Upon receiving this, the IC card executes the activation command message and returns a response message for notifying the host device that the activation command message has been executed. Next, after receiving the response message, the higher-level device transmits an application selection command message to the IC card. Upon receiving this, the IC card executes the application selection command message, and returns a response message for notifying that the execution of the application selection command message is completed to the higher-level device. Subsequently, after receiving the response message, the host device transmits an authentication command message to the IC card. Upon receiving this, the IC card executes the authentication command message and returns a response message for notifying the host device that the authentication command message has been executed. Further, after receiving the response message, the host device transmits an ID read command message to the IC card. Upon receiving this, the IC card executes the ID read command message and returns a response message for notifying the host device that the ID read command message has been executed. In this way, the host device and the IC card communicate by repeatedly transmitting command messages and response messages alternately.

  When the command message and the response message are repeatedly transmitted between the host device and the IC card as described above, the rewritable nonvolatile data corresponding to each command message is received in the data processing circuit of the IC chip built in the IC card. A process of designating, reading, or rewriting specific data stored in a predetermined area of the volatile memory must be frequently performed. In particular, when a plurality of data are alternately accessed, the processing becomes very complicated. Further, when the IC card is a multi-application type IC card, the same processing must be executed for each of a plurality of applications, which makes the processing more complicated.

  By the way, the multi-application type IC card is a highly convenient IC card that can execute a plurality of applications with a single IC card. However, in actual use, it is very difficult to use only a single specific application. Too many. In such a multi-application type IC card that uses only a single application, or an IC card equipped with only a single application, a plurality of command messages transmitted from a host device, and the plurality of There are cases where the execution sequence of command messages is practically fixed, and in each access between the host device and the IC card, most of the specific sequences for executing the command messages and response messages are not changed. For example, an entrance / exit management IC card, an employee ID IC card, etc., which are used only for specifying the individual who performs the same access every time, can be cited as specific examples.

  When operating a multi-application type IC card that uses only a single application or an IC card equipped with only a single application under the conditions as described above, as shown in FIG. The method of executing the command message each time and returning the response message is inefficient, and as a result, there is a problem that the processing time is reduced.

  Also, in order to shorten the time required for data processing, when executing a command message received from a host device, a predetermined area of a rewritable nonvolatile memory in an IC chip built in the IC card has been stored in the past. Several techniques have been proposed to record information about executed command messages and execution results, that is, history information, and to execute data processing using the corresponding history information when executing the same command message again. ing.

  Hereinafter, a specific example of a data processing technique using the history information will be described with reference to FIGS. 12 and 13.

  FIG. 12 is a schematic diagram showing an example of a data structure of data stored in a predetermined area of a rewritable nonvolatile memory in an IC chip built in the IC card. FIG. 12 shows an example of a data structure in a multi-application type IC card that can mount a plurality of applications.

  As shown in FIG. 12, generally, data stored in a predetermined area of a rewritable nonvolatile memory in an IC chip built in an IC card is configured in units of files, and is in a tree format in which these form a hierarchical structure. It has a data structure. A plurality of dedicated files exist under the main file at the top of the hierarchy, and a plurality of basic files exist under each dedicated file. For example, immediately below the “root folder” corresponding to the main file, two dedicated files, that is, “application 1 folder” and “application 2 folder” corresponding to two applications, and two basic files “file 1”. And “file 2” and “key 1” and “key 2” for collation. Further, immediately below the “application 1 folder”, there are three basic files “file 1”, “file 2” and “file 3”, and “key 3” for collation. Similarly, immediately below “Application 2 folder”, there are two basic files “File 1” and “File 2” and “Key 4” for collation.

  FIG. 13 is a diagram schematically showing a process in which the operating system of the IC card executes the received command message received from the host device.

  In FIG. 13, for example, the host device transmits three command messages, that is, an application selection command message, an authentication command message, and an ID read command message to the IC card, and the IC card receives these three command messages. At the same time, a process is shown in which the operating system of the IC card executes a series of received command messages in the order mentioned above. However, prior to this, an activation command message for activating the IC card is transmitted from the host device, but the description is omitted here.

  First, the IC card receives a command message for selecting “application 1 folder”, which is a dedicated file shown in FIG. The operating system of the IC card refers to the command message executed in the past and information related to the execution result, that is, history information stored in a predetermined area of the rewritable nonvolatile memory, and receives the received “application 1 folder”. Compare with the command message to select. If they match as a result of the comparison, a response message composed of the execution result of the command message executed in the past is returned to the host device.

  The history information described here will be described in detail. For example, the history information is defined as a stored message set stored in a predetermined area of the rewritable non-volatile memory, and has been executed in the past. Information related to the command message can be defined and expressed as a stored command message, and information regarding the execution result can be defined and expressed as a stored response message. In addition, the reception command message received by the IC card can also be defined and expressed as a reception command message, and information on the execution result can be defined and expressed as a transmission response message.

  Next, the IC card receives a command message to be collated with “key 3” which is the collation key shown in FIG. Then, the operating system of the IC card refers to the stored command message stored in a predetermined area of the rewritable non-volatile memory, and compares it with the received command message to be verified with “key 3”. If they match as a result of the comparison, a response message, which is the execution result of the command message executed in the past, is returned to the host device.

  Subsequently, the IC card receives a command message for reading “file 2” as the basic file shown in FIG. 12, that is, an ID read command message, from the host device. Then, the operating system of the IC card refers to the stored command message stored in a predetermined area of the rewritable nonvolatile memory, and compares it with the command message for reading the received “file 2”. However, in this case, the stored command message referred to by the operating system is a stored command message for reading “file 1” and does not match the received stored command message for reading “file 2”.

  Therefore, the operation system tries to refer to another suitable stored command message, but since there are a plurality of basic files under the root folder whose file name is “File 2”, the target file Cannot be identified.

  That is, the operating system executes the execution order of the three received command messages, and the two received command messages executed before the command message for reading “file 2”, that is, the command message for selecting “application 1 folder”, and Ascertain that each of the command messages to be collated with “Key 3” matches each of the stored command messages corresponding to these received command messages stored in a predetermined area of the rewritable nonvolatile memory. However, since the contents of the command message executed before the command message for reading “file 2”, that is, which application folder is selected is not recognized, which application folder It can not determine whether the underlying "File 2" of the, it is impossible to execute the command message.

  As an example of the above-described technique, as described in Patent Document 1, there is history information in which data contents processed by a command message and the address of the command message are paired, in other words, a stored message set is used. is there. However, it is not necessarily applicable under the condition that the plurality of command messages transmitted from the host device and the execution order of the plurality of command messages are fixed. In other words, the technique described in Patent Document 1 simply includes information about received received command messages in a stored message set to be referred to, in other words, received command messages and stored in a rewritable nonvolatile memory in the past. Information related to the execution result of the corresponding command message executed, in other words, if the stored command message matches, the command message execution process is omitted to reduce the processing time. Since the message execution order is not considered, the above problem cannot be solved.

  The technique described in Patent Document 2 also attempts to reduce processing time using history information, that is, a stored message set, as in Patent Document 1. However, with this technique, the contents of past command messages in the stored message set, for example, stored command messages, and the execution results thereof, for example, stored response messages, the contents of the first received command message received, and the received command message A comparison is made only for the execution result to check whether or not they match, and no comparison is made for the contents of the subsequent received command message. Therefore, the above problem cannot be solved.

  Further, the technique described in Patent Document 3 holds, when the patterns of a plurality of command messages issued from the host device are the same every time the system is activated, this is retained as history information, for example, a stored message set. Based on the above, the command message string having the above pattern is predicted and executed to reduce the processing time. However, in this technique, when a received command message sequence is compared with a command message sequence in the corresponding history information, if there is a command message that does not match in both command message sequences, this command is given priority. Therefore, it cannot be applied under conditions where the execution order of command messages is fixed. Therefore, the above problem cannot be solved.

  That is, in the related art, when the IC card executes a received command message received from the host device, the received received command message is compared with the history information corresponding to the received command message, that is, the stored command message, resulting in a mismatch. The target file cannot be specified, and the received command message cannot be accurately executed.

  The present invention has been made in view of the above circumstances, and its purpose is to be a multi-application type IC card that uses only a single application, or an IC card equipped with only a single application, from a host device. A plurality of command messages to be sent, and a command message to be executed each time when the execution sequence of the plurality of command messages is practically fixed and a specific sequence for sending command messages and response messages is not changed The IC card operating system is provided with a simple management function for skipping the processing of interpreting the contents of the command and executing the command message, and the time required for the entire data processing by omitting this processing. As well as shortening Even if the received command message received and the stored command message corresponding to the received command message do not match, an IC card that can identify the target file and execute the received command message accurately It is to provide.

  As a result of various studies, the present inventors have found the following means for solving the problems described above. That is, in the present invention, the host device transmits a command message to the IC card, and the operating system of the IC card that has received the command message interprets the content of the command message, that is, the content of the received command message. In addition to executing this, the IC card returns a response message as a reply to the received command message to the host device, and the operating system of the IC card is built in itself. In a predetermined area of the rewritable non-volatile memory in the IC chip, a stored command message composed of a pair of command header and command body, and a stored response message composed of response body and response trailer Made, and has a function of recording information on a plurality of storage message set, ranking the grant in the storage message set, and counting the storage message set number.

  Further, the operating system of the IC card according to the present invention includes the contents of the received command message received by the IC card, that is, the description format of each of the command header and the command body, and / or the received command message length, that is, the command header. And a total value of the data lengths of each of the command bodies and a value within the number of the plurality of stored message sets and belonging to a stored message set located in a rank that matches the value of the number of reception times of the received command message The contents of the stored command message, that is, the description format of each of the command header and the command body, and / or the stored command message length, that is, the total value of the data lengths of the command header and the command body are compared. If the comparison result matches, the operating system determines that the storage response message that is paired with the storage command message that is confirmed to match, and the transmission response message that is the execution result when the reception command message is executed. It is preferable that the received command message execution process is omitted, and the stored response message is returned to the higher-level device, assuming that they are equivalent.

  Further, when the operating system attempts to execute the nth received command message in the process of sequentially executing a plurality of command messages received by the IC card, it corresponds to the nth received command message. Confirming that the stored command messages belonging to the nth stored message set are different, that is, comparing the nth received command message with the stored command message belonging to the nth stored message set, If a mismatch is confirmed, the operating system temporarily returns to the first stored message set, starting from the first place, and the stored message set immediately before any stored message set that has confirmed the mismatch is located. Each stored message set reaching the rank, i.e. the (n-1) th rank The contents belong storage command message, interpreting one by one sequentially again, and it is preferable to execute a command message based on the stored command message.

  Then, after executing the above-described processing, the operating system receives the received command message received in the order in which the stored message set in which the mismatch is confirmed, that is, the value of the rank in which the nth stored message set is located, In other words, the nth received command message is executed, and a pair of stored command message and stored response message belonging to the nth stored message group that has confirmed the mismatch are referred to as the nth received command message and the nth received command message. It is better to rewrite the transmission response message that is the execution result of the received command message.

  Further, all the stored message groups in the rank after the nth stored message group that has confirmed the inconsistency, that is, both the stored command message and the stored response message that belong to all (n + 1) th stored message groups. It should be disabled so that the operating system cannot count them. Then, the transmission response message belonging to the rewritten nth stored message set may be sent back to the higher-level device.

  In addition, when the value of the reception command message received by the IC card exceeds the value of the number of the plurality of stored message sets stored in a predetermined area of the rewritable nonvolatile memory, for example, the reception When the number of command message receptions is (m + 1) times and the number of stored message groups is m, the operating system is the first among the plurality of stored message groups to which rankings are assigned. The contents of the stored command messages belonging to each stored message set starting from the last to the m-th position are interpreted one by one in the same manner as described above, and the command message based on the stored command message is executed Received command received in an order that matches the value exceeding the number of stored message sets. Message, ie, the (m + 1) th received command message is executed, and consists of a pair of transmission response messages that are the execution results of the (m + 1) th received command message and the (m + 1) th received command message. The stored message set should be added after the mth stored message set which is the last. The added transmission response message may be sent back to the higher-level device.

  Note that the command message described here indicates a message composed of a command header having a specific data length and a command body having a specific data length. Similarly, a response message refers to a message composed of a response body having a specific data length and a response trailer having a specific data length. The command message content indicates a command header and command body description format, and the response message content similarly indicates a response body and response trailer description format. Further, the command message length indicates a data length obtained by adding up the data length of the command header and the data length of the command body. Similarly, the response message length indicates the total data length of the response body data length and the response trailer data length.

  That is, according to the present invention, an operating system that receives a command message transmitted from a host device, interprets the contents of the command message, and executes the command message is installed, and the execution result of the command message is An IC card that sends a reply to a host device, and the operating system stores information about a plurality of stored message sets that are stored in a predetermined area of a rewritable non-volatile memory and that includes a pair of stored command messages and stored response messages. A function for recording, a function for the operating system to give a ranking to the plurality of stored message sets, a function for the operating system to count the number of the plurality of stored message sets, and the operating system A received command message received by the card, and a stored command message belonging to a stored message set that is a value within the number of the plurality of stored message sets and that matches the value of the number of received times of the received command message, The operating system compares the received command message with the stored command message and compares the received command message content and / or command message length with the stored command message content and / or command. When the message length match is confirmed, the operating system interprets the contents of the received command message received in the order that matches the value of the order in which the arbitrary stored message set for which the match is confirmed, and the received command Without execution of the message, the optional storage message sets stored response message, IC card having a function to reply to the host device is obtained.

  According to the present invention, the operating system compares the received command message with the stored command message, and the content and / or command message length of the received command message and the content and / or command message of the stored command message. When the length mismatch is confirmed, the operating system stores the previous stored message set starting from the first among the plurality of stored message sets to which the rank is given and confirming the mismatch. After interpreting and executing the contents of the stored command messages belonging to each stored message group one by one up to the order in which the message group is positioned, the value of the rank in which the arbitrary stored message group that has confirmed the inconsistency is positioned Received command messages received in matching order Interpret and execute the contents, rewrite the stored command message and the stored response message belonging to any stored message set for which the inconsistency is confirmed to the transmission response message that is the execution result of the received command message and the received command message After invalidating both the stored command message and the stored response message belonging to all the stored message groups in the rank after the arbitrary stored message group in which the mismatch is confirmed, the transmission response message is returned to the higher-level device. The IC card having the function of

  According to the present invention, when the value of the number of receptions exceeds the value of the number of the plurality of stored message sets, the operating system starts from the first among the plurality of stored message sets to which the rank is assigned. Received command messages received at positions exceeding the number of stored message groups after interpreting and executing the contents of the stored command messages belonging to each stored message group one by one in order, starting with the last one Interpreting and executing the contents of the stored message set consisting of a pair of the received command message and a transmission response message that is the execution result of the received command message, and appending after the last stored message set, The IC card having a function of returning a transmission response message to the host device is obtained.

  The present invention relates to a plurality of command messages transmitted from a host device in a multi-application type IC card that uses only a single device and a single application, or an IC card equipped with a single application, and Interpretation of command message contents and execution of the command message each time when the operation sequence of multiple command messages is practically fixed and the specific sequence for sending command messages and response messages is not changed A function that skips processing and omits it, that is, a pair of storage commands in which a rank is given to a predetermined area of a rewritable non-volatile memory, and the number is measured and managed Message and stored response A function for storing a plurality of stored message sets of messages and skipping the interpretation of the contents of the received command message and execution of the received command message when the received received command message matches the stored command message In the operating system of the IC card, the stored response message can be regarded as equivalent to the execution result of the received command message, and the stored response message can be returned to the host device. As a result, the entire processing time is shortened by the amount of omitting this processing, and as a result, the communication time between the host device and the IC card can be shortened. Furthermore, even if the received command message and the stored command message corresponding to the received command message do not match, the target file can be identified and the received command message can be executed accurately.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a flowchart for explaining the process of command message and response message of the IC card of the present invention. FIG. 2 is a diagram for explaining data processing when the number of receptions of received command messages according to the IC card of the present invention is within the number of stored message sets, and all received command messages and stored command messages match. FIG. 3 is a diagram for explaining data processing when the number of receptions of received command messages according to the IC card of the present invention is within the number of stored message sets, and the received command messages and stored command messages do not partially match. FIG. 4 is a diagram for explaining data processing when the number of reception command messages received according to the IC card of the present invention exceeds the number of stored message sets.

  In FIG. 1, when communicating with a host device, the IC card of the present invention first receives external power supply and enters a power-on state, that is, an activated state (step S1). However, when the IC card is a contact system, power is supplied via the connection terminal of the IC chip of the IC card. When the IC card is a contactless system, the power is received via a power receiving antenna built in the IC card. Power is supplied by radio or the like.

  Subsequently, the IC card performs initialization processing, that is, resetting the CPU in the IC card, checking the built-in memory, etc. (step S2). Thereafter, the IC card receives an arbitrary command message transmitted from the host device (step S3).

  Hereinafter, data processing when the number of received command messages is within the number of stored message sets and the received command message and the stored command message all match will be described with reference to FIG. In FIG. 2, for example, the IC card receives a total of three command messages and returns a response message in response to the command message to the host device.

  Information on five stored message sets is recorded and stored in a predetermined area of a rewritable nonvolatile memory (hereinafter simply referred to as a memory) in an IC chip built in the IC card. Each stored message set includes a stored command message and a corresponding stored response message.

  Each stored message set is assigned a rank from the first place to the fifth place which is the last place. These orders are given by the IC card operating system, and at the same time, the operating system counts and manages the number of stored message sets.

  First, the IC card receives the first command message from the host device (step S3). Then, the operating system of the IC card receives the “reception command message 1” of the first reception command message and “storage command message 1” belonging to the first stored message group stored in a predetermined area of the memory. Are compared (step S4). As a result of the comparison, if the contents of each command message and / or the command message length match (step S5), the operating system determines the contents of the command message “Received Command Message 1” of the first received command message. Response consisting of “stored response message 1” belonging to the first stored message set that is interpreted and equivalent to the execution result when the received command message is executed without executing the received command message A message is returned to the host device (step S7).

  Next, the IC card receives the second command message from the host device (step S3). Then, the operating system of the IC card, as in the first reception, stores “reception command message 2” of the second reception command message and the second storage stored in a predetermined area of the memory. The “stored command message 2” belonging to the message set is compared (step S4). As a result of the comparison, if the contents and / or command message lengths of the command messages match each other (step S5), the operating system receives the “reception” of the reception command message for the second reception as in the case of the first reception. Interpret the contents of the command message “command message 2”, and execute the received command message without executing the received command message. A response message consisting of the “stored response message 2” to which it belongs belongs to the higher-level device (step S7).

  Then, the IC card receives the third command message, which is the last command message, from the host device (step S3). In this case as well, the same processing as in the case of the first reception or the second reception described above is performed, and from the “stored response message 3” belonging to the third stored message group stored in the predetermined area of the memory. Is returned to the host device to complete the series of processes.

  In this way, the received command message received by the IC card is compared with the stored command message belonging to the stored message set in the same rank order as the received command message reception count stored in a predetermined area of the memory. However, when the match is found, the processing time can be shortened by skipping the entire processing related to the interpretation of the received received command message and the execution of the received command message.

  Next, data processing when the number of received command messages is within the number of stored message sets and the received command message and stored command message do not partially match will be described with reference to FIGS. In FIG. 3, for example, the IC card receives a total of n times (where “n” indicates an arbitrary number of receptions) command message, and returns a response message in response to the command message.

  In a predetermined area of the memory, information on n or more stored message sets is recorded and stored. Each stored message set includes a stored command message and a corresponding stored response message. Similarly to the case described above, each stored message set is given a rank by the operating system. At the same time, the operating system counts and manages the number of stored message sets.

  In FIG. 3, the IC card has already received the first to (n−1) th command message and has responded to the response message to the higher-level device. Since the process until the response message is returned to the host device is the same as that described above, the description thereof is omitted here.

  Thereafter, the IC card receives the nth command message (step S3). Then, the operating system compares the “reception command message n” of the nth reception command message with the “stored command message n” belonging to the nth stored message group stored in a predetermined area of the memory. (Step S4). As a result of the comparison, the contents and / or command message lengths of the command messages did not match (step S5) and were not invalid values (step S6). At this time, the operating system of the IC card temporarily returns to the first stored message group, and the stored message group immediately preceding the nth stored message group starting from the first and confirming the mismatch is located. The contents of the stored command messages belonging to the respective stored message groups that reach the rank, that is, the (n-1) th position, are interpreted again one by one in order, and the stored command message is executed (step S8).

  Next, the operating system interprets the contents of the received nth received command message and executes the received command message (step S9). The operating system continues to store the “reception command message n” of the reception command message for the nth reception that has been confirmed to be inconsistent with the “storage command message n” belonging to the nth stored message group stored in a predetermined area of the memory. And rewrite processing is executed. At the same time, the “transmission response message n”, which is the execution result of the reception command message for the nth reception, is replaced with “stored response message n” belonging to the nth stored message group stored in a predetermined area of the memory, A rewriting process is executed (step S10).

  As a result, the nth stored message group is updated as a new nth stored message group composed of the “reception command message n” and the “transmission response message n”, and is stored in the memory.

  The operating system then stores all the stored message groups in the rank after the nth stored message group that has confirmed the mismatch, that is, the stored command message and the stored response message that belong to all (n + 1) th stored message groups. Both are invalidated by applying invalid values so that the operating system cannot count them (step S11).

  After that, the operating system returns a transmission response message including “transmission response message n” belonging to the rewritten nth stored message set to the upper apparatus (step S12).

  As described above, the IC card operating system according to the present invention, when there is a mismatch between the received command message and the stored command message compared in a series of processing, Interpret and execute the contents of the stored command messages belonging to each stored message group one by one up to the order in which the stored message group immediately before the stored message group is located, and finally receive commands when there is a mismatch The message is executed.

  Next, data processing in the case where the received number of received command messages exceeds the number of stored message sets will be described with reference to FIG. 1 and FIG. In FIG. 4, for example, the IC card receives a total of (m + 1) times (where “m” indicates an arbitrary number of receptions) command message, and returns a response message in response to the command message. .

  Information on m stored message sets is recorded and stored in a predetermined area of the memory. Each stored message set includes a stored command message and a corresponding stored response message. Similarly to the case described above, each stored message set is given a rank from the first place to the m-th place by the operating system. At the same time, the operating system counts and manages the number of these stored message sets. Yes. In this case, the invalid value is applied to all the stored message groups after the (m + 1) th place stored in a predetermined area of the memory.

  In FIG. 4, the IC card has already received the first to m-th command messages and has responded to the higher-level device in response to the command messages. Since the process until the response message is returned to the host apparatus is the same as that described above, the description thereof is omitted here.

  Thereafter, the IC card receives the (m + 1) th command message (step S3). The operating system then receives the received command message (m + 1) received command message “received command message (m + 1)” and the stored command message belonging to the (m + 1) th stored message group stored in a predetermined area of the memory. Are compared (step S4). As a result of the comparison, the corresponding stored command message does not exist in the (m + 1) th stored message set, and the operating system determines that this is an invalid value (step S5 and step S6), and is the same as described above. First, return to the first stored message group, interpret the contents of the stored command messages belonging to the first to mth stored message groups one by one again, and command based on the stored command message The message is executed (step S13).

  Next, the operating system interprets and executes the content of the (m + 1) th received command message (step S14). The operating system continues from “reception command message (m + 1)” of the (m + 1) th reception command message and “transmission response message (m + 1)” that is the execution result of the (m + 1) th reception command message. The stored message set to be configured is added after the m-th stored message set which is the last position stored in a predetermined area of the memory (step S15).

  As a result, the (m + 1) th stored message set is updated as a new (m + 1) th stored message set composed of the “reception command message (m + 1)” and the “transmission response message (m + 1)”. Retained in memory.

  Thereafter, the operating system returns a response message composed of “transmission response message (m + 1)” belonging to the added (m + 1) th stored message set to the higher-level device (step S12).

  In this way, the operating system of the IC card according to the present invention executes the command message when there is no stored message set having the stored command message corresponding to the received received command message in the series of processing. A stored message set consisting of the received command message and a transmission response message as an execution result of the command message is additionally recorded in the memory.

  In the following, examples of data processing executed by the operating system when performing communication with the host device using the IC card shown in the best mode for carrying out the present invention will be described with reference to FIGS. It explains using.

  The IC card used in the present embodiment is a non-contact IC card that communicates wirelessly with a host device, and can be loaded with a plurality of applications and equipped with an operating system that can handle a plurality of applications. IC card. Note that there are a total of three received command messages transmitted by the host device, that is, received by the IC card, the contents of these received command messages are fixed without change, and the reception order is also fixed. Shall. The reception command messages received by the IC card are an “application selection” command message, an “authentication” command message, and an “ID read” command message in the order of reception.

  FIG. 5 is a diagram showing the contents of each received command message, the contents of the response message, and the data length thereof according to the IC card of the present invention.

  In FIG. 5, for example, a received command message or stored command message (hereinafter simply referred to as a command message) of the first “application selection” with the command number “C1” is composed of a command header and a command body. The contents of the message are “selection command” and “application name”, respectively. Each data length is “5 bytes” and “16 bytes”.

  Further, the transmission response message or the stored response message (hereinafter simply referred to as response message) of the first “application selection” received with the command number “C1” is composed of a response body and a response trailer, and the contents of the response message Is not applicable for the response body, and is “response status” for the response trailer. Each data length is “0 bytes” and “2 bytes”.

  When these data lengths are added together, the data length of the entire command message is “21 bytes”, and the data length of the entire response message is “2 bytes”. Therefore, the total data length of the command message and the response message related to the first “application selection” with the command number “C1” is “23 bytes”.

  Similarly, the data length related to the second authentication “authentication” with the command number “C2” and the data length related to the third reception “ID read” with the command number “C3” are shown in FIG. It is as follows. In this embodiment, the data length of the ID is “8 bytes”.

  FIG. 6 is a diagram showing a processing time required for a command message comparison process per 1 byte according to the IC card of the present invention.

  As shown in FIG. 6, command message comparison processing, that is, when comparing an arbitrary received command message and a stored command message corresponding to this and belonging to an arbitrary stored message set stored in a predetermined area of the memory The processing executed in the process is composed of “task 1”, “task 2”, and “task 3”, and the processing time for each byte is “0.004 msec”, “0.002 msec”, and “task 3”. 0.004 msec ". Therefore, the processing time required for the command message comparison process per 1 byte is “0.010 msec” in total. Note that the processing time shown in FIG. 6 is calculated by the number of cycles of the IC chip instruction set.

  FIG. 7 is a diagram showing the processing time required for the stored message set writing process per byte according to the IC card of the present invention.

  As shown in FIG. 7, the stored message set writing process, that is, the process executed when an arbitrary received command message and the corresponding transmission response message are recorded in an arbitrary register for writing on the memory is “ Task 1 ”and“ task 2 ”, and the processing times of each are“ 0.004 msec ”and“ 0.004 msec ”, and the processing time required for the stored message set writing processing per 1 byte is these The total of “0.008 msec”. The processing time shown in FIG. 7 is calculated by the number of cycles of the IC chip instruction set.

  FIG. 8 is a diagram showing processing time required for command message comparison processing and stored message set writing processing of each received command message according to the IC card of the present invention.

  In FIG. 8, for example, the processing time required for the command message comparison processing of the first “application selection” command number “C1” is “0.010 msec”, which is required for the command message comparison processing per 1 byte. It is calculated by the product of the data length “21 bytes” of the received command message, and the value is “0.010 msec / byte” × “21 bytes” = “0.210 msec”.

  In addition, the processing time required for the stored message set writing process of the first “application selection” received with the command number “C1” is the processing time “0.008 msec” required for the stored message set writing process per 1 byte. The product is calculated by adding the product of the total data length “23 bytes” of the reception command message and the transmission response message and the memory write waiting time “2.000 msec”, and the value is “0.008 msec / byte” × “ 23 bytes "+" 2.000 msec "=" 2.184 msec ". However, the write waiting time of the memory is a value that depends on the performance of the IC chip. In this embodiment, the memory in the IC chip built in the IC card uses a memory whose write waiting time is “2.000 msec”.

  Similarly, the processing time required for the command message comparison process and the stored message set writing process related to the second authentication “authentication” with the command number “C2”, and the third reception “ The processing time required for the command message comparison process and the stored message set writing process related to “ID read” is as shown in FIG.

  By the way, in FIG. 8, when the command message comparison process from “C1” to “C3” is continuously executed, the above-mentioned reception command message reception count is within the number of stored message sets, and the received command This corresponds to the process in the case of data processing (FIG. 2) when the message and the stored command message all match. The processing time required for executing this process is the total processing time required for each command message comparison process from “C1” to “C3”, that is, “0.470 msec”.

  FIG. 9 is a diagram showing a processing time required for data processing when each received command message is executed in data processing related to a conventional IC card.

  In FIG. 9, conventional data processing, that is, the processing time required for the IC card to receive an arbitrary received command message, interpret the content of the received command message, and execute the received command message is shown in the command number “ In the process related to the reception command message “application selection” for the first reception command “C1”, in the process related to the reception command message “authentication” for the reception second time “23.00 msec” and the command number “C2”. Is “14.00 msec” in the process related to the third received command message “ID read” with “57.00 msec” and command number “C3”.

  Note that these are actually measured values when the processing time required for data processing of an arbitrary commercially available IC card is measured. However, the basic hardware configuration of the conventional IC card on the market is the same as that of the IC card used in this embodiment.

  FIG. 10 is a diagram showing the processing contents and processing time of data processing executed by the operating system according to the IC card of the present invention when the received command message and the stored command message do not partially match.

  In FIG. 10, three patterns of “execution example B”, “execution example C”, and “execution example D” are illustrated as execution examples in which the received command message and the stored command message do not partially match. “Execution example B” is a first-order storage in which the reception command message of the first “application selection” with the command number “C1” corresponds to this and is stored in a predetermined area of the memory. It is an execution example when it does not correspond to the stored command message belonging to the message set.

  “Execution example C” is the first received command message of the first “application selection” with command number “C1” corresponding to this and stored in a predetermined area of the memory. The received second received “authentication” received command message corresponding to the stored command message belonging to the stored message set and having the command number “C2” is stored in a predetermined area of the memory. It is an execution example when it does not correspond with the stored command message belonging to the second stored message set.

  The “execution example D” is the first received command message of the first “application selection” with the command number “C1” corresponding to this and stored in a predetermined area of the memory. The received second received “authentication” received command message corresponding to the stored command message belonging to the stored message set and having the command number “C2” is stored in a predetermined area of the memory. A received command message of “ID read” for the third time of reception corresponding to the stored command message belonging to the second stored message set and having the command number “C3” corresponds to this and is stored in a predetermined area of the memory. It is an execution example when it does not correspond to the stored command message belonging to the third stored message group stored.

  For example, in the “execution example B”, when the IC card receives the first “select application” received with the command number “C1”, the operating system of the IC card starts with “ The received command message of “C1 comparison” process, that is, “application selection” is compared with the stored command message corresponding to this and belonging to the first stored message group stored in a predetermined area of the memory. The processing time required for the command message comparison process at this time is “0.210 msec” as shown in FIG.

  Next, the operating system of the IC card interprets and executes the contents of the received command message of “C1 execution” of process number “processing 2”, that is, “application selection”. Then, a transmission response message that is the execution result is returned to the higher-level device. The processing time required for this processing is “23.00 msec” as shown in FIG.

  Subsequently, the operating system of the IC card sends the “C1 set writing” process of process number “process 3”, that is, the reception command message of “application selection” and the transmission response message generated in “process 1” in the memory. The stored message set writing process for recording in a predetermined area holding the first stored message set is executed. The processing time required for this process is “2.184 msec” as shown in FIG. 8 described above.

  Finally, the operating system of the IC card determines that the stored command messages belonging to all the stored message groups after the second place stored in the predetermined area of the memory, that is, the “following group deletion” process of the process number “process 4”. And invalidation processing that uses the stored response message as an invalid value. The processing time required for the processing at this time is “2.000 msec”, which is only the write waiting time.

  The operating system of the IC card continuously executes the processes from “Process 1” to “Process 4” described above, and completes the execution process related to the first reception command message “application selection”. The processing time required for the entire processing at this time is the sum of the processing times required for the processing from “processing 1” to “processing 4”, and the value is “27.39 msec”.

  Thereafter, the IC card receives the second “authentication” received with the command number “C2”. First, the operating system of the IC card interprets and executes the contents of the received command message of “C2 execution” of process number “processing 1”, that is, “authentication”. Then, a transmission response message that is the execution result is returned to the higher-level device. The processing time required for this process is “57.00 msec” as shown in FIG.

  This “C2 execution” process is stored in the “process 4” performed in the execution process related to the first “application selection” with the previous command number “C1”, that is, stored in a predetermined area of the memory. As a result of the invalidation processing of the stored command message and the stored response message belonging to all the stored message groups after the second place, the memory includes the stored command message and the stored response message corresponding to the received command message of “authentication”. This is done because there is no stored message set.

  Next, the operating system of the IC card stores the “C2 set writing” process of process number “process 2”, that is, the reception command message of “authentication” and the transmission response message generated in “process 1” in the memory. The stored message set writing process for recording in a predetermined area holding the second stored message set is executed. The processing time required for this process is “2.184 msec” as shown in FIG. 8 described above.

  The operating system of the IC card continuously executes the processes from “Process 1” to “Process 2” described above, and completes the execution process related to the second received command message “Authentication”. The processing time required for the entire processing at this time is the total processing time required for the processing from “processing 1” to “processing 2”, and the value is “59.18 msec”.

  Further, the IC card receives the third “read ID” received with the command number “C3”. First, the operating system of the IC card interprets and executes the contents of the received command message of “C3 execution” of the process number “processing 1”, that is, “ID read”. Then, a transmission response message that is the execution result is returned to the higher-level device. The processing time required for this processing is “14.00 msec” as shown in FIG.

  This “C3 execution” process is stored in the “process 4” performed in the execution process related to the first “application selection” with the previous command number “C1”, that is, stored in a predetermined area of the memory. From the stored command message and the stored response message corresponding to the “read ID” received command message, the stored command message and the stored response message belonging to all the stored message groups of the second and subsequent ranks are invalidated. This is because there is no stored message set.

  Next, the operating system of the IC card stores the received command message of “C3 set writing” processing with the processing number “processing 2”, that is, “ID read”, and the transmission response message generated by “processing 1” in the memory. A stored message set writing process for recording in a predetermined area holding the third highest stored message set is executed. The processing time required for this processing is “2.080 msec” as shown in FIG.

  The operating system of the IC card continuously executes the processes from “Process 1” to “Process 2” described above, and completes the execution process related to the third received command message “Read ID”. The processing time required for the entire processing at this time is the total processing time required for the processing from “processing 1” to “processing 2”, and the value is “16.08 msec”.

  In this way, the IC card receives the three command messages received from the host device, that is, the first received command message “application selection” with the command number “C1” and the second received command with the command number “C2”. Executing the received command message “authentication” for the first time and the received command message “ID read” for the third received command number “C3”, and the response messages in response to these three received command messages A series of information sent back to is exchanged to complete the communication with the host device.

  Note that “execution example C” and “execution example D” differ only in the received command messages that do not match, and the other series of processes are the same as “execution example B”, and therefore detailed description here. Is omitted.

  FIG. 11 is a diagram showing a comparison between the processing time required for the data processing of the IC card of the present invention and the processing time required for the data processing of the conventional IC card.

  In FIG. 11, four patterns of “execution example A”, “execution example B”, “execution example C”, and “execution example D” are illustrated as execution examples of data processing of the IC card of the present invention. In the “execution example A”, when all of the three received command messages match, that is, the received first “select application” received command message with the command number “C1” corresponds to this, The received command message of the second “authentication” received with the command number “C2” matches the stored command message belonging to the first stored message set stored in the predetermined area of the memory. Corresponding and the received command message of the third “read ID” received with the command number “C3” that matches the stored command message belonging to the second stored message set stored in the predetermined area of the memory Corresponds to this, and the stored command message belonging to the third stored message group stored in the predetermined area of the memory. An execution example of matching the over-di. However, “execution example B”, “execution example C”, and “execution example D” illustrated here are the same as those described in FIG.

  In addition, since “execution example A” matches each of the received command messages of the three received command messages with each of the stored command messages corresponding to these and stored in a predetermined area of the memory, Execution processing relating to each received command message is completed only by command message comparison processing. Therefore, the processing time required for data processing related to each received command message of “execution example A” is the same as the processing time value required for the command message comparison processing shown in FIG.

  The processing time required for data processing of the conventional IC card is the same as the processing time value shown in FIG.

  In FIG. 11, the processing time required for the data processing of the conventional IC card, that is, the execution processing of a series of three received command messages is “94.00 msec”. On the other hand, among the data processing of the IC card of the present invention, in “execution example A”, the processing time is “0.470 msec”, and the processing time required for data processing of the conventional IC card is “1.0”. The value of “execution example A” is “0.005”, and the processing time required for data processing is 1/200.

  In addition, the processing time required for data processing of “execution example B”, “execution example C”, and “execution example D” is “102.7 msec”, “102.9 msec”, and “102.9 msec”, respectively. Similarly, when compared with relative values, they are “1.1”, “1.1”, and “1.1”, respectively, which are almost the same as the processing time required for data processing of a conventional IC card.

  Therefore, even in a multi-application type IC card, only a single application is practically used, the reception command message received from the host device is fixed without being changed, and the reception order is also fixed. In this case, as shown in the execution result of “execution example A” described above, the processing time required for the data processing is greatly shortened, and as a result, the communication time between the host device and the IC card can be shortened. This can be realized and the communication speed can be increased. At the same time, even if there is a mismatch between the received command message received and the stored command message corresponding to the received command message, the target file is identified with a processing time almost equivalent to the processing time of the conventional IC card. The received command message can be executed accurately.

  The processing time required for data processing related to each received command message illustrated in this embodiment is merely an example, and the performance of the IC chip built in the IC card to be used or the operating system of the IC card The results vary depending on the design. In this embodiment, the multi-application type IC card has been described as an example. However, the present invention is not limited to this, and an IC card on which a single application is mounted may be used. The communication with the host device is not limited to the illustrated non-contact type IC card, and may be a contact type IC card.

  The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to the embodiments, and the present invention is not limited to the scope of the present invention. Included in the invention. That is, it goes without saying that the present invention also includes various variations and modifications that would be obvious to those skilled in the art.

  The IC card of the present invention uses a multi-application type IC card in which a single specific application is frequently used, or an IC card having a single application, even if a plurality of applications are mounted. It can be used for an IC card communication system.

The flowchart explaining the process of the command message and response message of the IC card of the present invention. The figure explaining the data processing when the frequency | count of reception of the received command message which concerns on the IC card of this invention is less than the number of stored message groups, and all the received command messages and the stored command messages match. The figure explaining the data processing when the frequency | count of reception of the received command message which concerns on the IC card of this invention is less than the number of stored message sets, and a received command message and a stored command message do not correspond partially. The figure explaining the data processing when the frequency | count of reception of the reception command message which concerns on the IC card of this invention exceeds the number of stored message groups. The figure which shows the content of each received command message concerning the IC card of this invention, the content of a response message, and its data length. The figure which shows the processing time required for the command message comparison process per 1 byte concerning the IC card of this invention. The figure which shows the processing time which the stored message group write processing per 1 byte concerning the IC card of this invention requires. The figure which shows the processing time required for the command message comparison process of each received command message concerning the IC card of this invention, and a stored message group write process. It is a figure which shows the processing time required for a data process at the time of performing each reception command message by the data process which concerns on the conventional IC card. The figure which shows the processing content and processing time of the data processing which the operating system which concerns on the IC card of this invention performs when a reception command message and a storage command message partially do not correspond. The figure which shows the comparison of the processing time required for the data processing of the IC card of this invention, and the processing time required for the data processing of the conventional IC card. Schematic which shows an example of the data structure of the data stored in the predetermined area | region of the rewritable non-volatile memory in the IC chip incorporated in the IC card. The figure which showed typically the process in which the operating system of an IC card performs the execution process of the received command message received from the high-order apparatus. Schematic which showed an example of the sequence which performs transmission / reception of the command message and response message in communication between a high-order apparatus and an IC card.

Claims (3)

An IC card that receives a command message transmitted from a host device, interprets the content of the command message, and has an operating system that executes the command message, and returns the execution result of the command message to the host device Because
A function for recording information about a plurality of stored message sets, each of which is stored in a predetermined area of a rewritable nonvolatile memory, and which includes a pair of stored command messages and a stored response message;
A function for the operating system to give a ranking to the plurality of stored message sets;
A function for the operating system to count the number of the plurality of stored message sets;
The operating system receives a received message message received by the IC card and a stored message set that is a value that is within the number of the plurality of stored message sets and that matches the value of the number of times the received command message is received. Has a function to compare stored command messages belonging to
The operating system compares the received command message with the stored command message and confirms that the received command message content and / or command message length matches the stored command message content and / or command message length. If
The operating system does not interpret the content of the received command message received in the order that matches the value of the order in which the stored message set that has confirmed the match is located, and does not execute the received command message. An IC card having a function of returning a stored response message of a stored message set to the host device. The operating system compares the received command message with the stored command message and confirms that the received command message content and / or command message length does not match the stored command message content and / or command message length. If
The operating system starts from the first among the plurality of stored message groups to which the order is given, and reaches the order in which the stored message group immediately before the arbitrary stored message group in which the mismatch is confirmed is located. After interpreting and executing the contents of the stored command messages belonging to each stored message set one by one,
Interpret and execute the contents of the received command message received in an order that matches the value of the order in which any stored message set that confirmed the mismatch is located,
Rewriting the storage command message and the storage response message belonging to any stored message set that has confirmed the mismatch to the transmission response message that is the execution result of the reception command message and the reception command message,
After invalidating both the storage command message and the storage response message belonging to all the storage message pairs in the rank after the arbitrary storage message pair that confirmed the mismatch,
2. The IC card according to claim 1, further comprising a function of returning the transmission response message to the higher-level device. When the value of the number of receptions exceeds the value of the number of the plurality of stored message sets,
The operating system interprets the contents of the stored command messages belonging to each stored message group, one by one, in order from the first to the last among the plurality of stored message groups to which the order is given, After running
Interpreting and executing the contents of the received command message received at a position exceeding the value of the number of the plurality of stored message sets,
A pair of the received message message and a stored message set consisting of a transmission response message that is an execution result of the received command message are added after the last stored message set,
3. The IC card according to claim 1, further comprising a function of returning the transmission response message to the higher-level device.

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