JP2000306052A - Method for reading non-contact id information from data carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reading non-contact ID information from data carrier by which ID information can be prevented from being read by the third person. SOLUTION: In the memory of a data carrier, a memory area capable of reading/writing ID information and a system area for setting the propriety of access to the memory area are formed. After the ID information is written in the memory area, the system area is reloaded and set so as to disable access to the memory area. When reading the ID information from the data carrier through a reader/writer with no contact, after the system area is reloaded so as to enable access to the memory area, the ID information written in the memory area is read by the reader/writer and next, the system area is reloaded so as to disable access to the memory area. The ID information written in the memory area can not be read unless reloading and changing the system area so as to enable access.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for reading contactless ID information from a contactless data carrier such as a contactless ID tag.

[0002]

2. Description of the Related Art A non-contact type data carrier such as a non-contact ID tag is formed by incorporating a memory and a loop antenna, and is used, for example, by attaching it to a product. The ID information stored in the memory can be transmitted from the antenna, and the ID information transmitted from the antenna can be received and read by the reader / writer. The transmission and reception of the ID information is performed according to the same principle as that of the non-contact IC card having no power supply. That is,
The reader / writer is called by a weak radio wave, and the radio wave forms an induction electromagnetic field. Then, when the reader / writer is brought close to the data carrier to the extent that the data carrier antenna is located in the induction electromagnetic field, an electromotive force is generated in the antenna by electromagnetic induction. The ID information can be transmitted from the antenna, and the transmitted ID information can be received and read by the reader / writer.

In this non-contact type data carrier,
When the ID information is read by an arbitrary reader / writer, a malicious third party may read the ID information, duplicate the ID information, and be abused. Therefore, on the data carrier side, I
The D information is encrypted and written in the memory so that the ID information can be read and decrypted only by a reader / writer capable of decrypting the encryption.

[0004]

However, in order to encrypt the ID information on the data carrier side and write it into the memory, it is necessary to mount a CPU on the data carrier, but the radio wave from the reader / writer is weak. However, the electromotive force of the reader / writer is small, and it is difficult to cover the power for driving the CPU. Therefore, a non-contact type data carrier has to be equipped with only a memory, and ID information cannot be encrypted, which has a problem in security.

[0005] The present invention has been made in view of the above points, and a method for reading non-contact ID information from a data carrier which can prevent ID information from being read by a third party without having to mount a CPU. The purpose is to provide.

[0006]

According to the present invention, there is provided a method for reading contactless ID information from a data carrier, comprising: a memory area capable of reading and writing ID information in a memory of the data carrier;
After forming a system area for setting whether or not to access the memory area, writing ID information to the memory area, rewriting and setting the system area so that access to the memory area is disabled, and using a reader / writer. When reading the ID information from the data carrier in a non-contact manner, after rewriting the system area to enable access to the memory area, the ID information written in the memory area is read by a reader / writer, and then the system area is read. Is rewritten to disable access to the memory area.

[0007]

Embodiments of the present invention will be described below.

The data carrier is formed by incorporating a memory and an antenna as described above. Then, at the manufacturer of the data carrier, after assembling the data carrier, the ID information is written into the memory of the data carrier using a reader / writer and supplied to the user.

At this time, the memory is set so as to have the configuration of the memory map shown in FIG. 1. Of the memory addresses 0 to 9, addresses 0 and 1 are set as system areas. Addresses 2 to 9 are set as memory areas. Each address has an 8-bit configuration, and bits 0 and 1 of address 0 and 1 of the system area are used.
"0" or "1" is written to bit 7, and the ID information is written to any one of addresses 2 to 9 in the memory area.

Bit 0, bit 2, bit 4, and bit 6 at addresses 0 and 1 of the system area determine whether or not reading from the memory area is possible, that is, read access right, and "0" is written. If it is set, the access right is not set and reading from the memory area is disabled. If "1" is written, the access right is set and reading from the memory area is enabled. Bit 0, bit 3, bit 5, and bit 7 at addresses 0 and 1 in the system area determine whether or not writing to the memory area is possible, that is, write access right.
Is written, the access right is not set and writing to the memory area is disabled. If "1" is written, the access right is set and writing to the memory area is enabled.

The read / write access to the address 2 of the memory area, that is, the read / write access right is determined by the bit 0 and the bit 1 of the address 0. Similarly, the bit 2 and the address 2 of the address 0 are determined similarly. Bit 3 gives read / write access to address 3, bits 4 and 5 at address 0 grant read / write access to address 4, and bits 6 and 7 at address 0 grant read / write access to address 5. 6 by bit 0 and bit 1 at address 1
The right to read and write to address is given by bits 2 and 3 of address 1, and the right to read and write to address 7 is given by
The right to read and write to address 8 is determined by bits 4 and 5 of address 1, and the right to read and write to address 9 is determined by bits 6 and 7 of address 1.

For example, if "0" or "1" is written at addresses 0 and 1 in the system area as shown in FIG. 1, with respect to address 2 in the memory area, bit 0 of address 0 in the system area becomes "0". 1 and bit 1 are “0”, so that reading is possible and writing is impossible. For address 3 in the memory area, bit 2 of address 0 in the system area is “1” and bit 3 is “1”. ], Reading is possible and writing is possible. In the same manner, 4
The addresses are readable and writable, the address 5 in the memory area is readable and writable, and the address 6 in the memory area is readable and writable. At address 7, reading is not possible and writing is not possible. At address 8 of the memory area, reading is possible and writing is possible. At address 9 of the memory area, reading is possible and writing is possible. still,
The characters “Readable”, “Readable”, “Writable”, and “Writable” in the figure are written for explanation, and these characters are written in the memory area. It is not something.

When the manufacturer writes the ID information in the memory area of the memory of the data carrier, as shown in FIG. 2A, all of the bits 0 to 7 of the address 0 and the address 1 of the system area are used. "1" is written to all the addresses from address 2 to address 9 in the memory area so that read access and write access are permitted. In this state, ID information consisting of a unique serial number is written to any one (or a plurality) of addresses 2 to 9 of the memory area. For example, as shown in FIG. 2B, the ID information “123456” is written at address 2 of the memory area. After writing the ID information in any one of addresses 2 to 9 in the memory area in this manner, FIG.
As shown in (a), all of bits 0 to 7 of address 0 and address 1 of the system area are rewritten to “0”, and read access is performed at all addresses of addresses 2 to 9 of the memory area. No, write access should be disabled. Of course, "0" or "1" is assigned to bits 0 to 7 of address 0 and 1 of the system area so that only the address for writing the ID information among the addresses 2 to 9 of the memory area can be written. And write I at a predetermined address.
After writing the D information, rewriting of "0" or "1" of bits 0 to 7 of addresses 0 and 1 of the system area is performed so that reading of only the address where the ID information is written becomes impossible. It may be.

At this time, writing and rewriting "0" or "1" to bits 0 to 7 of addresses 0 and 1 of the system area, and writing ID information to addresses 2 to 9 of the memory area are as follows. This is performed by a reader / writer without contact.

As described above, I is stored in the memory area of the memory.
The data carrier on which the D information is written is supplied from the manufacturer to the user, and is used by attaching to the product or the like by the user. The ID information written in the memory area is set to be unreadable, and the method of setting the access right so that the ID information written in the memory area can be read is as follows. Since only the supplier is known, the ID information cannot be read by a general reader / writer. Therefore, it is possible to prevent a malicious third party from reading the ID information and copying and abusing the ID information.

When the user reads the ID information from the memory of the data carrier, the system area is rewritten so that the memory area can be read, and after reading the memory area, the reading of the memory area is performed. A recording medium storing a control program for controlling the reader / writer is provided so that the system area is rewritten so that access is disabled. The recording medium recording the control program is a data carrier. Provided by a supplier. In order to prevent a recording medium on which such a control program is recorded from being copied and abused, it is preferable to use a reader / writer equipped with the above-described control program.

For example, as shown in FIG. 3B, bit 0 at address 0 in the system area is rewritten to “1”, and an access right is set so that address 2 in the memory area can be read. In this state, the ID information “123456” written in the address 2 of the memory area is read. After reading the ID information written in the address 2 of the memory area in this way, the bit 0 at the address 0 in the system area is rewritten to “0” to return to the state of FIG. So that it cannot be read. At this time, rewriting of the system area and I
Reading of the D information is performed by a reader / writer in a non-contact manner.

In this way, the ID information can be read from the memory of the data carrier only by the reader / writer which operates based on the control program provided by the data carrier supplier. The third party who cannot obtain the ID can make it impossible to read the ID information. Therefore, high security can be obtained without the need to encrypt the ID information by incorporating a CPU in the data carrier.

[0019]

As described above, according to the present invention, a memory area for reading and writing ID information and a system area for setting whether or not to access the memory area are formed in the memory of the data carrier, and the ID information is stored in the memory area. After writing, rewrite and set the system area so that access to the memory area is disabled. When reading the ID information from the data carrier in a contactless manner with a reader / writer, rewrite the system area and write it to the memory area. After the access to the memory area is enabled, the ID information written in the memory area is read by a reader / writer, and then the system area is rewritten so that access to the memory area is disabled. The set ID information is set so that access is not allowed. The ID information written in the memory area cannot be read unless it is changed to allow it. A malicious third party reads the ID information, duplicates it, and abuses it. Can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 illustrates a memory map according to an example of an embodiment of the present invention.

FIGS. 2 (a) and 2 (b) show one example of a memory map of an example in the embodiment. FIG.

FIGS. 3 (a) and 3 (b) show one memory map of an example in the embodiment.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yutaka Maeda 1048 Kazuma Kadoma, Kadoma-shi, Osaka F-term in Matsushita Electric Works, Ltd. (Reference) 5B035 BB09 CA23 CA29 5B058 CA17 CA27 KA32

Claims (1)

[Claims] 1. A memory area for reading and writing ID information in a memory of a data carrier and a system area for setting whether or not access to the memory area is formed.
After writing the D information, rewrite and set the system area so that access to the memory area is disabled. When reading the ID information from the data carrier with a reader / writer without contact, rewrite the system area. After the access to the memory area is enabled, the ID information written in the memory area is read by a reader / writer, and then the system area is rewritten so that access to the memory area is disabled. To read contactless ID information from a data carrier.