JP3507754B2 - Non-contact IC card removal detection method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type IC card withdrawal detecting method.

[0002]

2. Description of the Related Art In the case of a contact type IC card,
Since the writer (CD: Coupling Device) and the card make contact with each other at the contact point, they communicate one-to-one. However, non-contact IC
In the case of a card, the card does not always exist in the area in which communication with the reader / writer is possible, and since multiple cards may simultaneously communicate with one reader / writer, the communication Leader pulling out the card on the way /
It becomes necessary for the writer and the upper side to recognize.

[0003]

In the non-contact IC card, the card may be pulled out during communication, and if this is not recognized by the reader / writer and the upper side, normal communication with the specific card is possible. There was a problem that I could not do it.

It is an object of the present invention to provide a non-contact IC card withdrawal detection method capable of detecting the withdrawal of a non-contact card in a communicable state on a reader / writer and a host side.

[0005]

According to the ISO / IEC7816 and JICSAP specifications, which are conventionally standardized in contact type IC cards, it is possible to allocate a plurality of logical channels to different files and communicate by each path. You can do it. On the other hand, for contactless IC cards, ISO / IEC14443 (proximity type), ISO / IEC15693 (proximity type)
Standardization is underway. With non-contact IC cards, since multiple cards may be used simultaneously for one reader / writer, the other party is specified using the card ID or node address to perform communication. Anti-collision (collision prevention) The method for is standardized. However, the standardization of the part related to the logical channel and the part related to the card withdrawal, which are defined by the contact type IC card, has not been prepared yet, and there is no prospect. Therefore, in the present invention, the contact-type I
We propose a method to easily realize pull-out detection by diverting the standardized specifications of C card and defining a special usage method of the logical channel.

According to the present invention, one of a plurality of logical channels defined in the standard specifications of contact type IC cards is assigned to a specific file (monitoring file), and information in the file is needed or frequently. By reading out (periodically, intermittently), it is recognized whether the designated card exists in the communication area or goes out of the communication area.

In the case of a card in which each file has its own security attribute, the (select file) command used to call a specific file is different each time, which is inefficient, whereas in the present invention, By introducing the concept of a logical channel to make it a dedicated channel for reading a specific file, ID reading becomes easy and fast.

The reader / writer and the host side can individually and actively recognize the non-contact IC cards in a communicable state (after being recognized by the reader / writer and assigned a logical ID). As a result, even if the contactless IC card is pulled out during communication, a communication error with a specific card can be prevented. In addition, the basic structure such as file structure and logical channel is
Since it is the same as the O / IEC7816 and JICSAP specifications, it is not necessary to consider the non-contact IC card pull-out detection from the zero base, and the contact-type card specification change to detect the non-contact IC card pull-out is small. The scale is enough.

In the third aspect, it is proposed that the monitoring file EF is arranged immediately below the main file MF. Claim 1
Then, if it is under the hierarchy of the designated monitoring file DF, the security provided for each DF of each hierarchy must be cleared every time the monitoring logical channel is selected, and the verification (or authentication) procedure must be performed. Becomes complicated. As shown in FIG. 2, the basic file E directly under the main file MF
By designating F as the monitoring file, it is possible to save the time and effort of the collation performed each time a card is added or removed. According to the second aspect, the selection of the monitoring logical channel can be made simpler and faster.

In claim 4, as shown in FIG. 3, it is proposed to store a card-specific ID in the monitoring file EF. Card unique ID stored in the monitoring file EF
By reading the
It becomes possible to individually manage which card is currently in the communication area. By managing each card individually, the service provider can create a customer management database of the frequency and use of the card and expand the service framework. In addition, a new advantage can be obtained in terms of security, such as invalidating the ID to prohibit the use of another person and preventing duplicate use by copying the card.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a file hierarchy structure of ISO / IEC7816 and JICSAP specifications standardized by a contact type IC card. In the contact type IC card, there are a dedicated file DF and a basic file EF with the main file MF as the root.
In this embodiment, by incorporating the specifications of the contact-type IC card into the non-standardized non-contact IC card,
It will be explained that the card pull-out detection can be easily realized. First, in the non-contact IC card, as shown in FIG. 2, one of a plurality of logical channels (the number of logical channels = n in FIG. 1) (hereinafter, a monitoring logical channel) is set to a specific basic file EF (hereinafter , Monitoring file). Next, read the information in the specific file to which the logical channel for monitoring is assigned, and monitor whether the specified card is still in the communication area or whether it goes out of the communication area. Thus, the pulling out of the non-contact IC card can be detected.

FIGS. 4 and 5 show the flow of the pull-out detection process in the non-contact IC card system supporting a plurality of non-contact IC cards. A read command is sent from the reader / writer to a card for which pull-out is to be detected among the cards for which the logical ID is set by processing such as anti-collision. If the contactless IC card is not pulled out, as shown in FIG. 4, the responses of all the cards that have received the read command of the reader / writer have been obtained, so the card can communicate with the reader / writer and the host side. You can confirm that it exists in the area. Next, when the card is pulled out, as shown in FIG. 5, the response of the card is not obtained to the read command of the reader / writer within the predetermined timeout time, so the reader / writer is in the upper side. A state change signal is immediately transmitted to the device to notify that the IC card removal is detected.

By receiving the state change signal, the upper side can recognize that the IC card of the communication partner does not exist in the communicable area, stop new writing and reading, and avoid communication error. be able to.

The pull-out detection timing is set in response to a request for a service to be provided. In the case of a service that grasps the usage time of the service using the card and bills at a fixed time interval, reading and writing of data in the card always occur, so it is desirable to detect the card withdrawal as frequently as possible. . As an example of the frequent pull-out detection, FIG. 6 shows a flow of processing for periodically performing pull-out detection at short time intervals. If another command is being processed at the time of detection of pulling out, the process is executed according to the priority order. FIG. 6 shows a case where the command processing is prioritized and the pull-out detection processing is delayed. Further, FIG. 7 shows the case where a command from the upper side is received during pull-out detection. When giving priority to the command from the higher-order side, the pull-out detection is interrupted as shown in FIG. 7, and the pull-out detection after the processing of the high-order command is re-executed.

On the other hand, in a service or the like used while operating a web screen, if communication with the card can be performed when necessary, such as showing the access right of a certain page with a card or confirming the identity of the person when transferring money. Good, there is no need for frequent pull-out detection. FIG. 8 shows an example in which the card withdrawal detection is performed by a command from the upper side when necessary. Conflicts with other processes can be avoided by executing the processes according to the priority order. Here, as an example of the process, anti-collision is given, and when the detection from the upper side has priority over the anti-collision. Is shown.

The pull-out detection of the present invention is performed by the reader /
Since the writer allocates the logical ID to the card with which the writer is trying to communicate, it is performed for the card to which the logical ID is allocated, and therefore it is not necessary to terminate the detection for the card detected by the anti-collision.

Further, in the pull-out detection according to the present invention, the processing cannot be ended just while signals are being exchanged. In the present invention, the presence / absence of a card is detected just before starting communication, and a state change signal is simply sent to the host side. The termination method of the service at that time is decided depending on the service or when the system is built.

[0019]

As described above, according to the present invention, the IC card can be individually recognized by the reader / writer and the host, so that the communication between the card and the reader / writer is the most effective. Inside, intentionally or by mistake
Even when the card is pulled out, it is possible to prevent errors that may occur in the data inside the IC card, the reader / writer, the upper database, and the like. Therefore, the user will not be involved in a trouble due to an error or a defect caused by pulling out the IC card, and can use the card with more peace of mind.

[Brief description of drawings]

FIG. 1 is a diagram showing assigning one of a plurality of logical channels to a specific file.

FIG. 2 is a diagram showing an example in which a monitoring file is arranged immediately below a main file MF.

FIG. 3 is a diagram showing an example in which an ID unique to a card is written in a monitoring file located immediately below a main file MF.

FIG. 4 is a flowchart showing a process when a non-contact IC card is not removed or added.

FIG. 5 is a flow chart showing processing when a non-contact IC card is removed.

FIG. 6 is a flowchart showing a process when a command is being processed at the time of detecting a periodic pull-out.

FIG. 7 is a flow chart showing a process when a command is received during periodic pull-out detection.

FIG. 8 is a flowchart showing a process when pulling out from the upper side when necessary.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Nagai 2-3-1, Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP 2001-236473 (JP, A) JP 2000 -47866 (JP, A) JP 2001-250090 (JP, A) JP 2001-209497 (JP, A) JP 11-175402 (JP, A) JP 10-225205 (JP, A) 58) Fields investigated (Int.Cl. ⁷ , DB name) G06K 17/00

Claims (4)

(57) [Claims] 1. A has a file structure in a storage area, pull disconnect the contactless IC card that supports logical channel of multiple
A method of detecting gas, a specific file reading one of the plurality of logical channels
A dedicated channel for taking seen by the reader / writer or an upper side read the information in the file, or a non-contact IC card specified is exist in the communication area, or exiting outside the communication area A non-contact IC card withdrawal detection method that recognizes. 2. The reader / writer is the non-contact IC.
The read command is sent to the card, and when the response is not obtained from the non-contact IC card within a predetermined time-out time, it is recognized that the non-contact IC card is not in the communication area . Non-contact IC card removal detection method. 3. The contactless IC card withdrawal according to claim 1, wherein the specific file is a basic file immediately below the main file.
Detection method. 4. The individual contactless I
The non-contact IC car according to any one of claims 1 to 3, wherein an ID unique to the C card is described.
Detection method of pulling out the cord .