JP2006227900A - Contactless communication device and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a contactless communication medium, which stores only specific identification codes and is used widely and low in cost, to ensure the security of data written with the data being freely written freely readable. <P>SOLUTION: Data to be written in the contactless communication medium, which is recognized as a data recording destination, are encoded. The encoded data are written in the storage part of the contactless communication medium being recognized as a data recording destination. The encoding of data is carried out, by using an identification code read from the storage part of the contactless communication medium being recognized as a data recording destination. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a non-contact communication apparatus that performs non-contact communication with a non-contact communication medium, reads data stored in a storage unit of the non-contact communication medium, or writes data to the storage unit, and The present invention relates to a non-contact communication method with the non-contact communication medium.

  In recent years, attention has been focused on non-contact communication media that are used by being affixed or embedded in various articles such as merchandise, cards, envelopes, and containers. This non-contact communication medium is called a wireless tag, an RFID (Radio Frequency Identification), a non-contact IC tag, or the like, and is usually a small and lightweight medium in which an antenna and an IC chip are provided on a tag-like substrate. The IC chip is provided with a non-volatile memory and a control circuit that modulates data stored in the memory into a radio wave and transmits the radio wave from the antenna. In the memory, a unique identification code assigned by the manufacturer at the stage of manufacturing the non-contact communication medium, that is, a so-called ID (Identification) is stored in a non-rewritable manner. Further, a user area where the user can arbitrarily write data is secured. In the user area, various information relating to an article provided with the contactless communication medium is generally written.

  On the other hand, a non-contact communication device for reading data stored in the storage unit of the non-contact communication medium or writing data to the storage unit includes an antenna that supports transmission and reception of radio waves. By receiving a radio wave transmitted from the non-contact communication medium by the antenna, the ID of the non-contact communication medium is read. Then, the non-contact communication medium placed in the antenna communication area is recognized from this ID, and if it is a data write target, the data necessary for the non-contact communication medium is wirelessly transmitted and written in the memory. If there is, it communicates with the non-contact communication medium and reads data stored in the memory.

  Nowadays, there is a demand for standardization of non-contact communication media. However, when the standards for non-contact communication media are unified, data on non-contact communication media can be easily read or written to non-contact communication media using a non-contact communication device generally sold in the market. Will be able to. For this reason, leakage of data written in the non-contact communication medium to a third party, tampering of illegal data, and the like are facilitated, and there is a problem that security cannot be ensured.

In order to solve such a problem, conventionally, a non-contact communication medium and a non-contact communication device have a common secret key so that data transmitted from the non-contact communication medium can be seen as variable. The technique has been known (for example, see Patent Document 1).
JP 2004-317764 A

  However, in the prior art in which a non-contact communication medium and a non-contact communication device have a common secret key, not only the non-contact communication device but also the non-contact communication medium must have a common secret key other than the ID. As a result, there is a problem that the non-contact communication medium becomes expensive.

  The present invention has been made based on such circumstances. The purpose of the present invention is to secure the security of data stored and held in a general-purpose and inexpensive non-contact communication medium storing only an ID, that is, a unique identification code. It is an object of the present invention to provide a non-contact communication device that can be secured and a non-contact communication method for the non-contact communication medium of this device.

  The present invention communicates with a non-contact communication medium in a non-contact manner, recognizes the non-contact communication medium by reading a unique identification code stored in the storage unit of the non-contact communication medium, and recognizes it as a data write destination. In the non-contact communication device for writing arbitrary data to the storage unit of the non-contact communication medium, the data encryption means for encrypting the data to be written to the non-contact communication medium recognized as the data write destination, and the data encryption means There is provided encrypted data writing means for writing the encrypted data into the storage unit of the non-contact communication medium recognized as the data writing destination. The data encryption means encrypts data using the identification code read from the storage unit of the non-contact communication medium recognized as the data write destination as an encryption key.

  The present invention also provides a non-contact communication apparatus having a function of reading data from a storage unit of a non-contact communication medium recognized as a data reading source, and reading data read from the storage unit of the non-contact communication medium recognized as a data reading source. Data decoding means for decoding, and read data output means for outputting the data decoded by the data decoding means as a result of reading from the non-contact communication medium recognized as the data reading source are provided. The data decrypting means decrypts the data read from the storage unit using the identification code read from the storage unit of the non-contact communication medium recognized as the data reading source as a decryption key.

  According to the non-contact communication apparatus of the present invention, it is possible to ensure the security of data stored and held in a general-purpose and inexpensive non-contact communication medium that stores only a unique identification code.

  In addition, the non-contact communication device communicates with the non-contact communication medium using the non-contact communication method of the present invention, so that data stored and held in a general-purpose and inexpensive non-contact communication medium storing only a unique identification code. Security can be ensured.

The best mode for carrying out the present invention will be described below with reference to the drawings.
In this embodiment, the non-contact communication medium is referred to as a wireless tag, and the non-contact communication device that reads data stored in the memory unit of the wireless tag and writes data to the memory unit is a wireless tag reader. It is called a writer.

  FIG. 1 is a schematic diagram used for explaining the outline of the present embodiment. In the figure, reference numerals 1A and 1B denote wireless tag reader / writers according to the present invention. Each of the wireless tag reader / writers 1A and 1B has antennas 2A and 2B. Through the antennas 2A and 2B, the wireless tag 4 attached to the article 3 communicates in a non-contact manner using radio waves or electromagnetic waves. And reading data stored in the memory unit of the wireless tag 4 and writing data to the memory unit. Usually, the wireless tag reader / writer 1A, 1B is used by being connected to a personal computer (hereinafter referred to as user PC) 5A, 5B of a user who uses the wireless tag reader / writer by means of communication, and data is written from the user PC 5A, 5B. Data is written to the wireless tag 4 designated as the loading destination, or data is read from the wireless tag 4 designated as the data reading source.

  The user PC may incorporate a function as a wireless tag reader / writer. Further, the wireless tag 4 is not necessarily attached to the article 3, and data can be written to and read from the single wireless tag 4.

  Each of the RFID tag reader / writers 1A and 1B has the same hardware and software configuration, and is also consistent in that the common basic encryption key table 6 is stored in a non-rewritable manner. Further, the extended encryption key tables 7A and 7B coincide with each other in that they are stored so as to be rewritable. However, different data is set in the extended encryption key tables 7A and 7B for each user of the wireless tag reader / writer 1A and 1B. Data in the extended encryption key tables 7A and 7B is managed by a key management personal computer (hereinafter referred to as a key management PC) 8 owned by the manufacturer of the wireless tag reader / writer 1A or 1B or a key management company entrusted to the manufacturer. The unique data for each user is distributed to the user PCs 5A and 5B in a timely manner. The user PCs 5A and 5B are provided with a data load tool 9 for the wireless tag reader / writers 1A and 1B. By the operation of the tool 9, the extended encryption key tables 7A and 7B are connected to the connected wireless tag reader / writers 1A and 1B. Data is to be loaded.

  The wireless tag 4 is a small and lightweight device in which an antenna and an IC chip are provided on a tag-like substrate. The IC chip includes a non-volatile memory and data stored in the memory is modulated into a radio wave. And a control circuit for transmitting from the antenna.

  As shown in FIG. 2, an ID (hereinafter referred to as uID) that is a unique identification code assigned and set by the manufacturer at the manufacturing stage of the wireless tag 4 is stored in the memory in an unrewritable manner. Further, a user area where the user can arbitrarily write data is secured. The user area is composed of a set of blocks of constant bytes, and a checksum value CS is stored in one block together with arbitrary data. The checksum value CS is a check value for maintaining the consistency of data written in the block.

  FIG. 3 is a block diagram showing the main hardware configuration of the wireless tag reader / writer 1A, 1B. The wireless tag reader / writer 1A, 1B includes an interface unit 11 connected to the user PCs 5A, 5B via a communication cable, a CPU (Central Processing Unit) 12 constituting the control unit body, a program, and the basic encryption key table 6. A non-rewritable ROM (Read Only Memory) 13 stored in advance, a rewritable nonvolatile EEPROM (Electrically Erasable Programmable ROM) 14 in which the extended encryption key tables 7A and 7B are stored, and various data are temporarily stored. A rewritable volatile RAM (Random Access Memory) 15 in which a data area for storage is formed, a modulation unit 16 that modulates a data signal to the wireless tag 4, and a modulated wave that is amplified and radiated from the antennas 2A and 2B Transmission amplifier 17 to be received, reception amplifier 18 to amplify radio waves received by antennas 2A and 2B, and amplified And a demodulator 19 for demodulating the radio wave.

  A pattern example of the basic encryption key table 6 is shown in FIG. An example of a pattern of the extended encryption key table 7A stored in one wireless tag reader / writer 1A is shown in FIG. 5A, and one pattern of the extended encryption key table 7B stored in the other wireless tag reader / writer 1B. An example is shown in FIG.

  In this example, the data written in the user area of the wireless tag 4 is composed of numeric strings 1 to 9 and 0. Further, the uID stored in the wireless tag 4 is a case of a three-digit number string. That is, the basic encryption key table 6 uses uID as a secret key (key) for encryption or decryption, and stores a converted value corresponding to each numerical value of 1 to 9 and 0 for each secret key. Is. For example, in the example of FIG. 4, if the secret key is “173”, the numeric string “12345567890” is converted to “21705534986” at the time of encryption. Conversely, the numeric string “2170534986” is converted to “12345567890” at the time of decoding. Similarly, if the secret key is “312”, the numeric string “12345567890” is converted to “6249580137” at the time of encryption. On the other hand, at the time of decoding, the numeric string “624945018137” is converted to “12345567890”.

  On the other hand, the extended encryption key tables 7A and 7B store a three-digit pseudo-uID that is set in a pseudo manner corresponding to each uID stored in the wireless tag 4. In the present embodiment, this pseudo uID becomes a secret key (key) for encryption or decryption of the basic encryption key table 6. The extended encryption key table 7A and the extended encryption key table 7B are different in the pattern of the pseudo uID set corresponding to each uID. For example, in the case of FIG. 5, uID “001” is converted to “312” in the case of the extended encryption key table 7A, and is converted to “342” in the case of the extended encryption key table 7B.

  As shown in the flowchart of FIG. 6, the CPU 12 of the wireless tag reader / writer 1A, 1B is connected to the user PC 5A. When a write or read command command is received from 5B (YES in ST1), uID inquiry data is generated and provided to the modulator 16 (ST2).

  As a result, the uID inquiry data is modulated into a modulated wave, amplified by the transmission amplifier 17, and then radiated from the antennas 2A and 2B. Here, if the wireless tag 4 is present in the arrival area of the modulated wave, the wireless tag 4 is activated. And uID memorize | stored in the memory part of this radio | wireless tag 4 is transmitted as a modulated wave from a tag antenna. The modulated waves are received by the antennas 2A and 2B, amplified by the receiving amplifier 18, and then demodulated to uID by the demodulator 19 and given to the CPU 12.

  Therefore, the CPU 12 waits to receive the uID of the wireless tag 4 after transmitting the uID inquiry data (ST3). If uID is received, it is determined whether the wireless tag 4 having the uID is a wireless tag to be written (ST4) or a wireless tag to be read (ST5).

  Here, the user PC 5A. When the write instruction command is received from 5B and the uID read from the wireless tag 4 is recognized as the uID of the wireless tag 4 to be written, the CPU 1 stores the uID in the work area A of the RAM 15. After that (ST6), the writing process specifically shown in FIG. 7 is executed.

  First, as ST11, data DATA to be written to the wireless tag 4 and the block number N of the write destination are acquired from the user PCs 5A and 5B. Next, referring to the extended encryption key tables 7A and 7B as ST12, the uID in the work area A is converted into a pseudo uID. Next, in ST13, the basic encryption key table 6 is referenced using the pseudo uID as an encryption key, and the write data DATA is encrypted into data DATA '(data encryption means).

  Next, a checksum value CS is calculated from the encrypted data DATA ′ and the unencrypted data DATA as ST14 (encrypted inspection value calculation means). Next, data for instructing writing of the data DATA ′ and the checksum value CS encrypted in the memory area of the block number N is generated for the wireless tag 4 in which the uID in the work area A is set as ST15. To the modulation unit 16 (encrypted data writing means). Thus, since the encrypted data DATA ′ and the checksum value CS are written in the area of the block number N in the memory unit of the wireless tag 4 in which the uID is set by non-contact communication, the CPU 12 determines the user PC 5A as ST16. , 5B, a data write success response signal is transmitted, and this write processing is terminated.

  On the other hand, user PC 5A. When the reading instruction command is received from 5B and the uID read from the wireless tag 4 is recognized as the uID of the wireless tag 4 to be read, the CPU 1 stores the uID in the work area A of the RAM 15. After (ST7), the reading process specifically shown in FIG. 8 is executed.

  First, the block number N of the reading destination is acquired from the user PCs 5A and 5B as ST21. Next, as ST22, a command for instructing the wireless tag 4 in which the uID in the work area A is set to read the data of the block number N is generated and given to the modulation unit 16. As a result, the data DATA ′ and the checksum value CS written in the block number N of the memory unit are read by non-contact communication with the wireless tag 4, and the CPU 12 reads the data DATA ′ and the checksum value. CS is stored in work areas B and C of RAM 15, respectively.

  Next, referring to the extended encryption key tables 7A and 7B as ST23, the uID in the work area A is converted into a pseudo uID. Next, in ST24, the basic encryption key table 6 is referenced using the pseudo uID as a decryption key, and the read data DATA 'is decrypted into data DATA (data decryption means).

  Next, a checksum value CS ′ is calculated from the data DATA decoded as ST25 and the data DATA ′ before being decoded (decoding check value calculation means). Next, in ST26, the checksum value CS 'and the checksum value CS stored in the work area C are compared to determine whether or not they match. Here, when both checksum values CS ′ and CS match, the data DATA combined as ST27 is transmitted to the user PCs 5A and 5B as data read from the wireless tag 4 (data output means). On the other hand, if the two checksum values CS ′ and CS do not match, a read error response is transmitted to the user PCs 5A and 5B as ST28. This completes the reading process.

  Now, using the wireless tag reader / writer 1A storing one extended encryption key table 7A, the data “1234” is stored in the area of the block number “1” of the two wireless tags 4 with uID “001” and “002”. ”Is considered. In this case, when the wireless tag reader / writer 1A receives the uID “001” or “002” from the wireless tag 4, the wireless tag reader / writer 1A recognizes that the wireless tag 4 is a wireless tag to be written.

  When the uID “001” is recognized, the uID “001” is first converted into a pseudo uID with reference to the extended encryption key table 7A. In this case, uID “001” is converted to pseudo uID “312”. Next, the basic encryption key table 6 is referenced using the pseudo uID “312” as an encryption key, and the data “1234” is encrypted. In this case, the data “1234” is encrypted as “6249”. Next, the checksum value CS (1234 + 6249 = 7483) of the data “1234” before encryption and the data “6249” after encryption is calculated. Thus, the encrypted data “6249” and the checksum value CS (7483) are written into the block number “1” of the wireless tag 4 in which uID “001” is set.

  When the uID “002” is recognized, the uID “002” is first converted into a pseudo uID with reference to the extended encryption key table 7A. In this case, uID “002” is converted to pseudo uID “413”. Next, with reference to the basic encryption key table 6 using the pseudo uID “413” as an encryption key, the data “1234” is encrypted. In this case, the data “1234” is encrypted as “7324”. Next, a checksum value CS (1234 + 7324 = 8558) between the data “1234” before encryption and the data “7324” after encryption is calculated. Then, the encrypted data “7324” and the checksum value CS (8558) are written in the block number “1” of the wireless tag 4 in which uID “002” is set.

  Next, the case where the data “1234” is written in the area of the block number “1” of the wireless tag 4 whose uID is “001” using the wireless tag reader / writer 1B that stores the other extended encryption key table 7B. Think. In this case, when the wireless tag reader / writer 1B receives uID “001” from the wireless tag 4, the wireless tag reader / writer 1B recognizes that the wireless tag 4 is a wireless tag to be written. First, the uID “001” is converted into a pseudo uID with reference to the extended encryption key table 7B. In this case, uID “001” is converted to pseudo uID “342”. Next, with reference to the basic encryption key table 6 using the pseudo uID “342” as an encryption key, the data “1234” is encrypted. In this case, the data “1234” is encrypted as “2914”. Next, a checksum value CS (1234 + 2914 = 4148) of data “1234” and “2914” is calculated. The encrypted data “2914” and the checksum value CS (4148) are written to the block number “1” of the wireless tag 4 in which uID “001” is set.

  Next, after writing the data “1234” in the area of the block number “1” of the wireless tag 4 with uID “001” using the wireless tag reader / writer 1A that stores one of the extended encryption key tables 7A. Suppose that the data is read from the area of the block number “1” of the wireless tag 4. In this case, when the wireless tag reader / writer 1A receives uID “001” from the wireless tag 4, the wireless tag reader / writer 1A recognizes that the wireless tag 4 is a wireless tag to be written. First, the data written in the block number “1” and the checksum value are read from the wireless tag 4. In this case, data “6249” and checksum value CS (7483) are read.

  Next, the uID “001” is converted into a pseudo uID with reference to the extended encryption key table 7A. In this case, uID “001” is converted to pseudo uID “312”. Next, with reference to the basic encryption key table 6 using the pseudo uID “312” as a decryption key, the data “6249” is encrypted. In this case, the data “6249” is converted to “1234”. Next, the checksum value CS ′ (6249 + 1234 = 7483) of the data “6249” before decryption and the data “1234” after decryption is calculated. Then, it is compared with the checksum value CS (7483) read from the wireless tag 4 with uID “001”. In this case, since both checksum values CS ′ and CS match, the decrypted data “1234” is transmitted to the user PC 5A.

  Next, after writing the data “1234” in the area of the block number “1” of the wireless tag 4 with uID “001” using the wireless tag reader / writer 1A that stores one of the extended encryption key tables 7A. Then, consider a case where data is read from the area of the block number “1” of the wireless tag 4 using the wireless tag reader / writer 1B that stores the other extended encryption key table 7B. In this case, when the wireless tag reader / writer 1B receives uID “001” from the wireless tag 4, the wireless tag reader / writer 1B recognizes that the wireless tag 4 is a wireless tag to be written. First, the data written in the block number “1” and the checksum value are read from the wireless tag 4. In this case, data “6249” and checksum value CS (7483) are read.

  Next, the uID “001” is converted into a pseudo uID with reference to the extended encryption key table 7B. In this case, uID “001” is converted to pseudo uID “342”. Next, with reference to the basic encryption key table 6 using the pseudo uID “342” as a decryption key, the data “6249” is encrypted. In this case, the data “6249” is converted to “9142”. Next, the checksum value CS ′ (2914 + 9142 = 2056) between the data “2914” before decoding and the data “9142” after decoding is calculated. Then, the checksum value CS (4148) read from the wireless tag 4 with uID “001” is compared. In this case, since the two checksum values CS ′ and CS do not match, a read error response is transmitted to the user PC 5B.

  Thus, by using the wireless tag reader / writers 1A and 1B of the present embodiment, data is encrypted and written to the wireless tag 4, so that the wireless tag reader / writer other than the present embodiment is used for the wireless tag 4. Even if the stored data is read, the actual data is not known and security can be ensured. In this case, since the uID that each wireless tag has uniquely is used as a key for encryption, the existing inexpensive general-purpose wireless tag 4 can be used as it is.

  Further, even when data common to a plurality of wireless tags 4 is written by one wireless tag reader / writer 1A, 1B, the uID of each wireless tag 4 never matches, so that data with different values is written. Become. Therefore, even if data stored in a plurality of wireless tags 4 is read using a wireless tag reader / writer other than the present embodiment, there is no possibility that the same data is written because the data is different. .

  Further, since the extended encryption key tables 7A and 7B are stored in a rewritable nonvolatile memory, the extended encryption key tables 7A and 7B having different data for each user of the wireless tag reader / writers 1A and 1B are used. become able to. Moreover, the data can be changed appropriately. Therefore, even if the user uses the wireless tag reader / writer according to this embodiment, data can be prevented from being read by another user.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.

  For example, in the above-described embodiment, the EEPROM is shown as the rewritable nonvolatile memory for storing the extended encryption key tables 7A and 7B. However, the rewritable nonvolatile memory is not limited to the EEPROM. There may be. Further, when an HDD device or a memory card is mounted, the extended encryption key tables 7A and 7B may be stored in these storage devices.

  In the above embodiment, the extended encryption key tables 7A and 7B are used. However, the data is encrypted or decrypted with reference to the basic encryption key table 6 using the uUD as an encryption key or a decryption key. However, since it is possible to ensure the security of data that can be read and written to a general-purpose and inexpensive non-contact communication medium that stores only a unique identification code, it is possible to omit the extended encryption key tables 7A and 7B. .

  In the above embodiment, the present invention is applied to the wireless tag reader / writer. However, the wireless tag reader that exclusively reads data of the wireless tag 4 and the wireless tag writer that exclusively writes data are common to each. The present invention can be applied by using the extended encryption key tables 7A and 7B.

  In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be combined.

The schematic diagram which shows the outline | summary of the system configuration | structure in one embodiment of this invention. The schematic diagram which shows the memory area structure of the radio | wireless tag used in the embodiment. FIG. 3 is a block diagram showing a main configuration of the wireless tag reader / writer in the embodiment. FIG. 3 is a schematic diagram showing an example of a basic encryption key table stored in the wireless tag reader / writer in the embodiment. FIG. 3 is a schematic diagram showing an example of an extended encryption key table stored in two wireless tag reader / writers in the embodiment. 6 is a flowchart showing a main part of main processing executed by the CPU of the wireless tag reader / writer in the embodiment. FIG. 7 is a flowchart specifically showing a procedure of a writing process in FIG. 6. FIG. 7 is a flowchart specifically showing a procedure of reading processing in FIG. 6. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1A, 1B ... Wireless tag reader / writer, 4 ... Wireless tag, 5A, 5B ... User PC, 6 ... Basic encryption key table, 7A, 7B ... Extended encryption key table, 11 ... Interface part, 12 ... CPU, 13 ... ROM , 14 EEPROM, 15 RAM, 16 modulator, 17 transmitter amplifier, 18 receiver amplifier, 19 demodulator.

Claims (16)

Non-contact communication by recognizing the non-contact communication medium by performing non-contact communication with the non-contact communication medium and recognizing the non-contact communication medium by reading the unique identification code stored in the storage unit of the non-contact communication medium. In a non-contact communication device having a function of writing arbitrary data to the storage unit of the medium,
Data encryption means for encrypting the data using the identification code read from the storage unit of the contactless communication medium recognized as the data write destination as an encryption key;
Encrypted data writing means for writing the data encrypted by the data encryption means to the storage unit of the non-contact communication medium recognized as the data writing destination;
A non-contact communication device comprising: Further comprising a test value calculation unit at the time of encryption for calculating a test value for maintaining data consistency from the data encrypted by the data encryption unit and the data before being encrypted,
The non-contact communication medium in which the encrypted data writing means recognizes, as the data write destination, data obtained by attaching the inspection value calculated by the encryption inspection value calculation means to the data encrypted by the data encryption means The non-contact communication device according to claim 1, wherein the non-contact communication device is written in the storage unit. A table memory that stores pseudo identification codes that are set in a pseudo manner corresponding to the respective identification codes of a plurality of contactless communication media that are data write targets,
The data encryption means converts the identification code read from the storage unit of the non-contact communication medium recognized as the data write destination into the pseudo identification code with reference to the table memory, and then converts the pseudo code after the conversion. 3. The contactless communication apparatus according to claim 1, wherein the data is encrypted using an identification code as an encryption key.   The contactless communication device according to claim 3, wherein the table memory is stored in a rewritable nonvolatile storage device. Non-contact communication by recognizing the non-contact communication medium by performing non-contact communication with the non-contact communication medium and recognizing the non-contact communication medium by reading the unique identification code stored in the storage unit of the non-contact communication medium. In a non-contact communication device having a function of reading data from the storage unit of the medium,
Data decrypting means for decrypting the data read from the storage unit using the identification code read from the storage unit of the non-contact communication medium recognized as the data reading source as a decryption key;
Read data output means for outputting the data decoded by the data decoding means as a read result from the non-contact communication medium recognized as the data reading source,
A non-contact communication device comprising: A decoding check value calculation means for calculating a check value for maintaining data consistency from the data decoded by the data decoding means and the data before being decoded;
The read data output means is configured to decode the data on the condition that the check value calculated by the decoding check value calculation means coincides with the check value attached to data before decoding. 6. The non-contact communication apparatus according to claim 5, wherein the data decoded by the means is output as a read result from the non-contact communication medium recognized as the data reading source. A table memory that stores pseudo identification codes that are set in a pseudo manner corresponding to the respective identification codes of a plurality of contactless communication media that are data write targets,
The data decoding means converts the identification code read from the storage unit of the non-contact communication medium recognized as the data reading source into the pseudo identification code with reference to the table memory, and then converts the pseudo code after the conversion. 7. The contactless communication apparatus according to claim 5, wherein the data is decrypted using an identification code as a decryption key.   The contactless communication apparatus according to claim 7, wherein the table memory is stored in a rewritable nonvolatile storage device. Non-contact communication by recognizing the non-contact communication medium by performing non-contact communication with the non-contact communication medium and recognizing the non-contact communication medium by reading the unique identification code stored in the storage unit of the non-contact communication medium. In a non-contact communication apparatus having a function of writing arbitrary data in the storage unit of the medium and a function of reading data from the storage unit of the non-contact communication medium recognized as a data reading source,
Data encryption means for encrypting the data using the identification code read from the storage unit of the contactless communication medium recognized as the data write destination as an encryption key;
Encrypted data writing means for writing the data encrypted by the data encryption means to the storage unit of the non-contact communication medium recognized as the data writing destination;
Data decrypting means for decrypting the data read from the storage unit using the identification code read from the storage unit of the non-contact communication medium recognized as the data reading source as a decryption key;
Read data output means for outputting the data decoded by the data decoding means as a read result from the non-contact communication medium recognized as the data reading source,
A non-contact communication device comprising: A test value calculation unit at the time of encryption for calculating a test value for maintaining data consistency from the data encrypted by the data encryption unit and the data before being encrypted;
A decoding check value calculation means for calculating the check value from the data decoded by the data decoding means and the data before being decoded;
The non-contact communication medium in which the encrypted data writing means recognizes, as the data write destination, data obtained by attaching the inspection value calculated by the encryption inspection value calculation means to the data encrypted by the data encryption means Writing to the storage unit of
The read data output means is configured to decode the data on the condition that the check value calculated by the decoding check value calculation means coincides with the check value attached to data before decoding. 10. The non-contact communication apparatus according to claim 9, wherein the data decrypted by the means is output as a read result from the non-contact communication medium recognized as the data reading source. A table memory that stores pseudo identification codes that are set in a pseudo manner corresponding to the respective identification codes of a plurality of contactless communication media that are data write targets,
The data encryption means converts the identification code read from the storage unit of the non-contact communication medium recognized as the data write destination into the pseudo identification code with reference to the table memory, and then converts the pseudo code after the conversion. The data is encrypted using the identification code as an encryption key,
The data decoding means converts the identification code read from the storage unit of the non-contact communication medium recognized as the data reading source into the pseudo identification code with reference to the table memory, and then converts the pseudo code after the conversion. The contactless communication apparatus according to claim 9 or 10, wherein the data is decrypted using an identification code as a decryption key.   The non-contact communication device according to claim 11, wherein the table memory is stored in a rewritable nonvolatile storage device. Non-contact communication is performed between the non-contact communication device and the non-contact communication medium, and the non-contact communication device reads the unique identification code stored in the storage unit of the non-contact communication medium in a non-rewritable manner. In the non-contact communication method of recognizing a contact communication medium and writing arbitrary data in the storage unit of the non-contact communication medium recognized as a data write destination by the non-contact communication device,
The non-contact communication device is:
When recognizing the non-contact communication medium as the data write destination, an encryption step of encrypting the data using the identification code read from the storage unit of the non-contact communication medium as an encryption key;
A non-contact communication method comprising: a data writing step of writing the data encrypted by the encryption step into the storage unit of the non-contact communication medium recognized as the data write destination. The non-contact communication device includes a table memory configured to store a pseudo identification code set in a pseudo manner corresponding to each identification code of a plurality of non-contact communication media to be written with data,
The encryption step includes a step of converting the identification code read from the storage unit of the non-contact communication medium recognized as the data writing destination into the pseudo identification code with reference to the table memory, and a pseudo identification after the conversion The contactless communication method according to claim 13, further comprising: encrypting the data using a code as an encryption key. Non-contact communication is performed between the non-contact communication device and the non-contact communication medium, and the non-contact communication device reads the unique identification code stored in the storage unit of the non-contact communication medium in a non-rewritable manner. In the non-contact communication method of recognizing a contact communication medium, the non-contact communication device reads data from the storage unit of the non-contact communication medium recognized as a data reading source.
The non-contact communication device is:
When recognizing the non-contact communication medium as the data writing destination, a decryption step of decrypting the data read from the storage unit using the identification code read from the storage unit of the non-contact communication medium as a decryption key;
A non-contact communication method comprising: a data output step of outputting the data decoded by the decoding step as a read result from the non-contact communication medium recognized as the data reading source. The non-contact communication device includes a table memory configured to store a pseudo identification code set in a pseudo manner corresponding to each identification code of a plurality of non-contact communication media to be written with data,
The decoding step includes the step of converting the identification code read from the storage unit of the non-contact communication medium recognized as the data reading source into the pseudo identification code with reference to the table memory, and the pseudo identification after the conversion 16. The contactless communication method according to claim 15, further comprising the step of decrypting the data using a code as a decryption key.

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