JP2000276558A - Method for preventing forgery of composite recording carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery prevention method which inhibits a normal access as long as an optical recording part is not correctly paired with an IC part by changing the physical or logical position of the information to be recorded in a recording area other than a 1st recording area in based on the ID inherent to each recording carrier that is recorded at a specific position of the 1st recording area. SOLUTION: In the composite recording carrier where the 1st to n-th recording areas are arranged on the same carrier, an ID inherent to each carrier is recorded at a specific position of the 1st recording area. When the information is recorded or reproduced in a recording area other than the 1st recording area, the ID is reproduced at the specific position and the physical or logical position is changed for the recording/reproducing operations of information based on the reproduced ID. For instance, two elementary files (EF1, EF2) 61 and 62 are previously produced at an IC part of a hybrid card and at the inside of a master file MF 60. Then a card inherent ID is recorded on the file 62 when a card is issued.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing a composite record carrier from being altered.

[0002]

2. Description of the Related Art There are various types of information recording media, such as discs, cards, and tapes. Among them, an optical information recording medium (hereinafter, referred to as an optical card) formed in a card shape is small and lightweight,
Due to its excellent portability and relatively large capacity, it has attracted attention as an information recording medium for recording personal information history and the like.

When data is recorded or reproduced on such an optical card, management information (hereinafter, referred to as a directory) for managing the data is recorded on the optical card together with the data, and the data is managed for each file. ing.

As shown in FIG. 11, the directory includes information necessary for file management such as a file name 50, a file length 51, a sector address 52 of the first data, a date and time 53 when the file was recorded, and the like. Information is recorded on a part of the optical card to manage files. As shown in FIG. 10, in the recording area of the optical card, a plurality of tracks 4 separated by tracking tracks 3 are arranged in parallel in the recording area 2, and physical ends of the tracks are provided at both ends of each track. The track number 5 indicating a proper position is preformatted. The track at the bottom in the figure is the track with track number 0, and the track one above it is track number 1. For an optical card with n tracks, the track number of the top track is n
It is -1. The recording area 2 is provided with a data section 6 that is an area for recording data, and a directory section 7 that is an area for recording a directory of the data section 6. In FIG. 10, the data section 6 has one sector per track, and the directory section 7 has 8 sectors per track, but the number of sectors per track is
It can be changed depending on the size of the data or directory to be recorded.

The optical card 1 is a write-once recording medium, in which both data and directories are sequentially recorded in unrecorded areas in sector units. When recording data on the optical card 1, the data is sequentially recorded on the data section 6 from the top to the bottom of the optical card 1. On the other hand, when recording a directory, recording is performed in units of sectors from the left to the right of the track, and after recording for one track, the data is sequentially recorded in the directory section 7 from the lower part to the upper part.

In the write-once type optical card that performs such recording, data cannot be physically rewritten. However, data and directories can be logically rewritten by using recorded data as valid data. It is.

On the other hand, an IC card that is small, light, and excellent in portability, like an optical card, has attracted attention as a highly secure recording medium. The IC card is a plastic card in which an IC chip with an external terminal is embedded, has a built-in nonvolatile memory and a CPU, and transmits and receives data through the external terminal.

[0008] The IC card also manages data for each file, and a file ID and a security attribute are set for each file. Depending on the setting of the security attribute, it is possible to make it impossible to access any desired file without performing predetermined authentication. Since such a security function is controlled by the built-in CPU, it can be said that it is extremely difficult for a person who does not know the password for releasing the security to access the data in the nonvolatile memory.

However, although the IC card is excellent in terms of security, it has a problem that information that can be recorded is only about several kilobytes and cannot be used for recording a large amount of data.

Therefore, an optical / IC hybrid card (hereinafter referred to as a hybrid card) has been developed by combining an optical card having a merit of a large capacity and an IC card with high security. The hybrid card includes an optical recording section 2 and an IC section 11, as shown in FIG. The IC unit 11 is arranged on the back side of the optical recording unit 2. The optical recording section 2 has the same configuration as the optical card,
The unit 11 is similar to an IC chip of an IC card.

In the hybrid card, various information management methods are being studied in order to supplement the disadvantages of the optical recording unit and the IC unit and to make use of the features of high security and large capacity. One of them is a method disclosed in Japanese Patent Application Laid-Open No. 6-162288. In this method, a directory (file management information) conventionally recorded in an optical recording unit is recorded in an IC unit. The optical recording unit 2 has only a data unit. All the information in the directory section is recorded in the rewritable IC section 11.

The advantage of this method is that when a directory is rewritten, the conventional optical card has had to add a new directory to the directory section 7.
In the case of this method, the directory recorded in the IC section only needs to be rewritten, so that the recording area of the optical recording section can be saved. Further, by recording the directory in the IC unit, it is possible to expect a security effect.

[0013]

However, the above-mentioned prior art has the following problems. For example, when using the hybrid card of the above-described conventional example to record data of a health check that is performed periodically, usually, a plurality of hybrid cards are formatted in the same manner, and the data file of the health check is written to the optical recording unit. Record and store personal passwords and data file directories in IC
Department to record and distribute. Then, each time a health check is performed, a new file is recorded.

However, since the data of the medical examination is often of a fixed length, the position of the data file recorded in the optical recording unit and the number of sectors are the same for all the cards unless the replacement process due to the recording error is performed. become. That is, the file length 51 of the directory of the recorded file and the sector address 52 of the leading data are the same for all the cards, and the information recorded in the IC section can be the same for all the cards except for the personal password. The nature is great.

The hybrid card has an optical card in which an IC chip is embedded. However, since the IC chip is bonded to the optical card with an adhesive, the IC chip can be peeled off without damage if it is carefully performed. it can. I
Even when it is difficult to peel off the C chip, it is relatively easy to cut out the IC portion with a sharp blade or the like since the card substrate is made of plastic.

Accordingly, if a hybrid card of another person is obtained, the IC chip of the hybrid card of another person is peeled off, and the IC chip of the own hybrid card is bonded, or if the IC chip is cut out and replaced, the user's own hybrid card is obtained. There was a problem that by entering the password, the data of another person could be viewed. Further, when the sector address 52 of the first data has the same value, even if a recording error occurs, a normally recorded sector until the recording error occurs is read.

In addition to the above-described example of the medical examination, when a fixed-length data file is recorded in the optical recording unit and a directory is recorded in the IC unit, forgery or alteration of the above-described conventional hybrid card is easy.

Accordingly, the present invention has been made in view of the above problems, and in order to cope with such forgery and falsification, normal access is disabled if the optical recording unit and the IC unit are not the correct pair. It is an object to provide a method for preventing alteration.

[0019]

That is, according to the present invention, in a composite record carrier in which a plurality of first to n-th record areas are arranged on the same carrier, each record carrier is located at a specific position of the first record area. When a unique ID is recorded and information is recorded or reproduced in a recording area other than the first recording area, first,
ID is reproduced from a specific position in the recording area of
A method for preventing alteration of a composite record carrier, characterized in that a physical or logical position where information is recorded and reproduced is changed based on the information.

Further, the present invention provides a composite record carrier in which a plurality of first to n-th record areas are arranged on the same carrier.
In the case where an ID unique to each record carrier is recorded at a specific position in the first recording area and information is recorded or reproduced in a recording area other than the first recording area, first, the specific position of the first recording area is specified. A method for preventing alteration of a composite record carrier, characterized in that a physical or logical position for recording and reproducing information is changed based on the reproduced ID.
In the composite record carrier, a first recording area is an IC section having a nonvolatile memory and a CPU, a second recording area is a write-once optical recording section, and at least data is recorded in the optical recording section. Is a hybrid card that records at least the data management information in addition to the ID, and when recording or reproducing information in the optical recording section, changes the physical position of the sector for recording and reproduction based on the ID. This is a method for preventing alteration of a composite record carrier.

Further, according to the present invention, in a composite record carrier in which a plurality of first to n-th record areas are arranged on the same carrier, an ID unique to each record carrier is provided at a specific position of the first record area.
When recording or reproducing information in a recording area other than the first recording area, first, an ID is reproduced from a specific position in the first recording area, and based on the reproduced ID,
A method for preventing falsification of a composite record carrier, characterized by changing a physical or logical position where information is recorded / reproduced, wherein the composite record carrier has a first recording area of a write-once optical recording unit, The second recording area is an IC unit having a nonvolatile memory and a CPU, a hybrid card that records at least data in addition to the ID in the optical recording unit, and records at least management information of the data in the IC unit. , IC
A method for preventing alteration of a composite record carrier, characterized in that when recording or reproducing information in a unit, the file ID of a file to be recorded or reproduced is changed based on the ID.

[0022]

DETAILED DESCRIPTION OF THE INVENTION According to the present invention,
In a composite record carrier in which a plurality of first to n-th recording areas are arranged on the same carrier, an ID unique to each record carrier is recorded at a specific position of the first recording area, and the IDs other than the first recording area are recorded. When recording or reproducing information in the recording area, first, an ID is reproduced from a specific position in the first recording area, and a physical or logical position at which information is recorded or reproduced is changed based on the reproduced ID. This is achieved by a method for preventing alteration of a composite record carrier.

Further, according to the present invention, the above object is achieved in a composite record carrier in which a plurality of first to n-th record areas are arranged on the same carrier, each record being located at a specific position of the first record area. When an ID unique to a carrier is recorded and information is recorded or reproduced in a recording area other than the first recording area, first, the ID is reproduced from a specific position in the first recording area, and based on the reproduced ID. A method for preventing alteration of a composite record carrier, wherein a physical or logical position at which information is recorded and reproduced is changed. A hybrid card for recording at least data in the optical recording section and recording at least the data management information in addition to the ID in the IC section. And the journal When performing a recording or reproducing information into parts, it is achieved by tampering prevention method of a composite record carrier, characterized in that to change the physical location of a sector for recording and reproducing on the basis of the ID.

Further, according to the present invention, the above object is provided by:
In a composite record carrier in which a plurality of first to n-th record areas are arranged on the same carrier, an ID unique to each record carrier is recorded at a specific position of the first record area, and the other than the first record area When recording or reproducing information in the recording area, first, the ID is reproduced from a specific position in the first recording area, and the physical or logical position for recording and reproducing the information is changed based on the reproduced ID. A method for preventing falsification of a composite record carrier, wherein the composite record carrier has a first recording area of a write-once optical recording section, and a second recording area of an IC having a nonvolatile memory and a CPU. A hybrid card that records at least data in addition to the ID in the optical recording unit, and records at least management information of the data in the IC unit. When information is recorded or reproduced in the IC unit, To the ID It is achieved by tampering prevention method of a composite record carrier, characterized in that to change the file ID of the file for recording and reproducing by Zui.

According to the present invention, based on a unique ID of each record carrier recorded at a specific position of the first record region of a composite record carrier in which a plurality of first to n-th record regions are arranged on the same carrier, In order to change the physical or logical position of the information to be recorded in the recording area other than the recording area 1, the recording position of the information is different for each record carrier. Since the ID reproduced from the recording area is required, there is an effect that it is possible to prevent an illegal forgery or alteration such as replacing the recording area in the composite record carrier.

Further, the present invention provides an IC with high security.
Since the ID is recorded in the unit and the possibility that the ID is illegally read is low, it is also difficult to forge an IC chip in which the same ID as the ID of a certain hybrid card is recorded, and to prevent unauthorized forgery. There is an effect that can be.

Further, according to the present invention, the information to be recorded in the IC section of the hybrid card is recorded in a file having a different file ID depending on the card. This makes it impossible to read the management information at all, and the data in the optical unit cannot be reproduced, so that the data leakage can be prevented.

[0028]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG. 2 shows a hybrid card used in this embodiment.
The hybrid card of FIG. 2 is the same as that of FIG. 9 described in the conventional example. In FIG. 2, the IC unit 11 is an ISO
/ IEC7816, and the inside has the structure shown in FIG. Master file (MF) 60
Inside, two elementary files (EF) are created in advance. Elementary file (EF)
Reference numeral 61 denotes a file for recording a directory which is management information of a file recorded in the optical recording unit 2, and an elementary file 62 is a file for recording an ID unique to a card. The file IDs of these two elementary files are determined in advance, and each card is the same. When the card is issued, an ID unique to the card is recorded in the EF 62. The card-specific ID may be any value as long as it is a value unique to each card.

FIG. 3 is a block diagram of a hybrid card information recording / reproducing apparatus for recording / reproducing data and directories on / from such a hybrid card 10. As shown in FIG.
The hybrid card information recording / reproducing device 31 is connected to a host computer 32 as an external storage device,
Recording and reproduction are performed under the control of the host computer 32.

Numeral 37 drives a transport mechanism (not shown) to introduce the hybrid card 10 into a predetermined position in the drive 31 and to reciprocate the hybrid card 10 in the R direction at the predetermined position. Is a card feed motor for discharging the outside of the apparatus. Reference numeral 38 denotes a light beam irradiating optical system including a semiconductor laser as a light source, and irradiates the hybrid card 10 with a light beam of the light source focused on a minute light spot when recording or reproducing information. When performing recording, a strong light beam is irradiated, and when performing reproduction, a weak light beam that does not record is irradiated.

Reference numeral 39 denotes a photodetector for detecting each light beam reflected from the hybrid card 10, and 40 denotes a part of the light beam irradiation optical system 38 for driving the hybrid card 10
An AF actuator 41 for moving the focus position of the light spot on the recording medium surface in the Z direction, that is, in a direction perpendicular to the recording medium surface, and performing autofocus control, 41 drives a part of the light beam irradiation optical system 38. This is an AT actuator for performing auto-tracking control by moving a light spot on the recording medium surface in the Y direction, that is, a direction orthogonal to the track 4.

The optical head 30 includes the light beam irradiation optical system 38, the photodetector 39, the AF actuator 40, and the AT actuator 41. Reference numeral 36 denotes a head feed motor for moving the optical head 30 in the Y direction to seek a light beam to a desired track.

The MPU 33 is a processor for controlling each unit in the hybrid card information recording / reproducing device 31, and has a built-in ROM and RAM. The MPU 33 controls each unit such as the head feed motor 36 and the card feed motor 37, and transmits and receives data to and from the host computer 32. The AT / AF control circuit 34 includes the photodetector 3
The AF actuator 41 is driven on the basis of the output signal from the light source 9 to perform auto-focus control so that the light spot from the light beam irradiation optical system 38 is focused on the recording medium surface. The automatic tracking control is performed so that the scanning is performed following the scanning.

The modulation / demodulation circuit 35 is a circuit for modulating data to be recorded under the control of the MPU 33 and for demodulating a reproduced signal. When recording data, the data is transferred from the host computer 32 to the MPU 33,
These are sequentially stored in the RAM of the PU 33. The data stored in the RAM is modulated by the modulation / demodulation circuit 35 by a predetermined modulation method. Further, the light source in the light beam irradiating optical system 38 is driven according to the modulated signal, and the light spot whose intensity is modulated according to the data is scanned on the track 4 to form an optically detectable information pit row. Record.

On the other hand, at the time of data reproduction, the light beam irradiation optical system 38 scans a reproduction light beam that is not recorded on a track to be reproduced, and the light detector 39 detects reflected light from the hybrid card 10. Modulation / demodulation circuit 35
Performs a predetermined demodulation process based on the output signal of the photodetector 39 to reproduce data. The reproduced data is sequentially stored in the RAM and then transferred to the host computer 32.

Reference numeral 42 denotes a terminal for accessing the IC unit, and the MPU 33 is configured to communicate with the IC unit based on the electrical characteristics and protocol specified by ISO / IEC7816. The hybrid card information recording / reproducing device 31 operates as described above.

Next, the procedure for recording and reproducing data in the method for preventing alteration of a composite record carrier according to the present invention will be described with reference to the flowchart shown in FIG.

The data recording / reproducing procedure in the present invention is as follows.
First, it is monitored that a hybrid card is inserted (step 201).
The IC unit is activated (Step 202). Next, IC
Card-specific ID from specific file EF62 of unit 11
Is reproduced and its value is stored (step 203).

Further, in step 204, all recorded directories are read from the file EF61 of the IC unit and stored. When the directory is read, the file names, recorded sector addresses, and file lengths of all the files in the optical recording unit 2 are known, so that the recording start sector address of the next data (the first sector address of the unrecorded area) is known. Ready for recording and playback.

In step 205, a command from the host computer 32 is waited. If the command is to record a file, first in step 209, the recording position is determined.

The recording position is determined by the following calculation from the recording start sector address of the next data obtained in step 204 and the card-specific ID stored in step 203. Set the value of the next data recording start sector address to A
Assuming that ddl, the ID unique to the card is Id, and the total number of sectors in the optical recording area 2 is n, the recording position is: recording position = (Addl + (Id mod n)) mod n. Here, “A mod B” means the remainder of dividing A by B.

When the value of Id mod n is m, the recording position is the position of Addl when m is regarded as the sector address 0 for convenience. In the case of one sector per track, as shown in FIG. 5, m + 1 is address 1, m +
2 is address 2, m-1 is address n-1, and m-2 is address n-2. Since Id is different for each card, the recording position is different for each card even if the value of Addl is the same.

In step 210, data is recorded from the recording position determined in this way, and in step 211, the directory of the data recorded in the optical
Additional recording is performed in the EF 61 of the unit 11. The value of the sector address 52 of the head data of the directory to be additionally recorded is not the value of the calculated recording position but the value of Addl. Further, the same information as the directory additionally recorded is stored in the same manner as the directory reproduced in step 204, and the process returns to step 205.

If the command is to reproduce a file in step 205, first, in step 207, a reproduction position is determined.

The playback position is first determined from the directory of the file name specified by the host computer, and is determined by the following calculation from the sector address 52 of the head data of the directory and the card-specific ID stored in step 203. I do. The value of the sector address 52 of the head data of the directory is Add2, and the ID unique to the card is I.
d, assuming that the total number of sectors in the optical recording area 2 is n, the reproduction position is the reproduction position = (Add2 + (Id mod n)) mod n.

If the value of Id mod n is m, the reproduction position is the position of Add2 when m is regarded as the sector address 0 for convenience. Since Id is a different value for each card, the reproduction position is different for each card even if the value of Add2 is the same.

Therefore, if data is reproduced by illegally exchanging the IC chip, the value of Id used at the time of recording and the value of Id used at the time of reproduction are different. Can prevent data leakage. When the reproduction position is determined, the data is reproduced in step 208, the reproduced data is transmitted to the host computer, and the process returns to step 205.

If the command is card ejection in step 205, the IC section 11 is deactivated in step 206, the hybrid card is ejected from the information recording / reproducing device 31, and the process is terminated. The method for preventing alteration of the composite record carrier of the present invention executes recording and reproduction in the above-described procedure.

In the above embodiment, the case of two recording areas of the optical recording section and the IC section has been described. However, the number of recording areas is not limited to two but may be three or more. In that case, each record carrier specific I
The same effect can be obtained by changing the data recording position by a unique ID in all recording areas where D is not recorded.

In the above embodiment, a hybrid card composed of an optical recording section and an IC section is used. However, any other recording medium such as a magnet stripe, a non-contact IC, and a magneto-optical recording area may be used. Similar effects can be obtained. Further, although the card-shaped record carrier is used in the above embodiment, the shape of the composite record carrier is not limited to a card, and the same effect can be obtained with any shape.

Embodiment 2 Next, another embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7 shows a hybrid card used in this embodiment. The hybrid card shown in FIG. 7 is the same as that shown in FIG.
However, an ID 64 unique to the card is recorded in a specific position (here, track number 0) of the optical recording unit 2 in advance. Since the optical recording section 2 is a write-once medium, the ID recorded at this specific position cannot be rewritten. The ID 64 may be any value as long as it is unique to each card.

The IC section 11 conforms to ISO / IEC7816, and has an internal structure shown in FIG. In the master file (MF) 60, the optical recording unit 2
An elementary file (EF) 63 for recording a directory, which is management information of the file recorded in the file, is created in advance. The file ID of the EF 63 is determined by the value of the ID 64 unique to the card. Here, the file ID is determined by the following calculation, but any calculation may be used as long as the 16-bit file ID is determined.

The file ID of the EF 63 = (card-specific ID mod 0xBFFF) + 0x4000 Here, “A mod B” means the remainder of A divided by B. “0x” means a hexadecimal number. By this calculation, the file ID of the EF63 is 0x4000
To 0xFFFE. Since the file ID has a different value for each card, the IC unit 1
The directory recorded in No. 1 is recorded in a logically different position depending on the card.

FIG. 3 shows a block diagram of a hybrid card information recording / reproducing apparatus for recording / reproducing data and directories on / from such a hybrid card 10.
The hybrid card information recording / reproducing device shown in FIG. 3 is the hybrid card information recording / reproducing device 3 shown in the first embodiment.
1 and the operation of the information recording / reproducing apparatus operates in the same manner as in the first embodiment.

Next, the data recording / reproducing procedure in the method for preventing alteration of the composite record carrier of the present invention will be described with reference to the flowchart shown in FIG. In the data recording / reproducing procedure according to the present invention, first, the insertion of a hybrid card is monitored (step 101), and when the hybrid card is inserted, the IC unit is activated (step 102). Next, a specific position of the optical recording unit 2 (here, track number 0)
And reproduces the card-specific ID 64 and stores the value (step 103).

In step 104, step 103
The file ID of the elementary file 63 in which the directory is recorded is calculated by the following calculation from the card-specific ID stored in step (1).

File ID of EF 63 = (ID unique to card 0xBFFF) + 0x4000 By this operation, a value between 0x4000 and 0xFFFE is obtained. This value is stored as the file ID of the EF 63.

Further, in step 105, all directories recorded from the EF of the file ID are read and stored. Here, if the hybrid card is a normal one, the calculated file ID and the file ID of the EF 63 match, so that the directory can be read out. In the case of a card, since the file ID calculated from the card-specific ID and the file ID of the EF 63 are different, the directory cannot be read, and the optical recording unit 2 cannot be accessed thereafter. That is, unless the optical recording unit 2 and the IC unit 11 are in the correct pair, access is not possible.

If the directory can be read normally in step 105, the file names of all the files in the optical recording unit 2, the recorded sector addresses, and the recording start sector address of the next data can be known.

In step 106, a command from the host computer 32 is waited. If the command is for reproducing a certain file, a desired file is reproduced with reference to the directory information stored in step 108, transmitted to the host computer, and the process returns to step 106.

If the command is recorded in step 106, the data sent from the host computer is recorded in order from the recording start sector address in step 109, and the directory is stored in the EF 63 of the file ID calculated in step 104 in step 110. Is additionally recorded.

If the command is to eject the card in step 106, the IC section 11 is deactivated in step 107, the hybrid card is ejected from the information recording / reproducing device 31, and the process is terminated. The method for preventing alteration of the composite record carrier of the present invention executes recording and reproduction in the above-described procedure.

In the above-described embodiment, the case of two recording regions, that is, the optical recording unit and the IC unit, has been described. However, the number of recording regions is not limited to two but may be three or more. In that case, each record carrier specific I
The same effect can be obtained by changing the data recording position by a unique ID in all recording areas where D is not recorded.

In the above embodiment, a hybrid card composed of an optical recording section and an IC section is used. However, any other recording medium such as a magnetic stripe, a non-contact IC, and a magneto-optical recording area may be used. Similar effects can be obtained.

Further, in the above embodiment, the I
The specific position where D is recorded is track number 0, but it may be recorded anywhere as long as the position can be specified. The shape of the composite record carrier is not limited to a card, and the same effect can be obtained with any shape. .

[0067]

As described above, the present invention is directed to a specific record carrier in which a plurality of first to n-th record areas are recorded at a specific position of the first record area of a composite record carrier arranged on the same carrier. In order to change the physical or logical position of the information to be recorded in the recording area other than the first recording area based on the ID, the recording position of the information differs for each record carrier. Since an ID reproduced from the first pair of recording areas is required, there is an effect that illegal forgery or alteration such as exchanging recording areas in a composite record carrier can be prevented.

The present invention also relates to an IC with high security.
Since the ID is recorded in the unit and the possibility that the ID is illegally read is low, it is also difficult to forge an IC chip in which the same ID as the ID of a certain hybrid card is recorded, and to prevent unauthorized forgery. There is an effect that can be.

The present invention also relates to a hybrid card I
Since the information to be recorded in the C section is recorded in a file having a different file ID depending on the card, if the IC chip is illegally replaced with that of another hybrid card, the management information of the IC section cannot be read at all, and the data of the optical section cannot be read. Can no longer be reproduced, so that there is an effect that data leakage can be prevented.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an example of a procedure of a method for preventing alteration of a composite record carrier of the present invention.

FIG. 2 is a schematic diagram illustrating an example of a hybrid card.

FIG. 3 is a block diagram showing a hybrid card information recording / reproducing apparatus.

FIG. 4 is a diagram showing a file structure of an IC unit.

FIG. 5 is an explanatory diagram showing a mechanism for changing a recording position.

FIG. 6 is a flowchart showing another example of the procedure of the method for preventing alteration of the composite record carrier of the present invention.

FIG. 7 is a schematic diagram showing another example of a hybrid card.

FIG. 8 is a schematic diagram showing an ID unique to a card.

FIG. 9 is a diagram showing a file structure of an IC unit.

FIG. 10 is an explanatory diagram showing a conventional information recording method for an optical card.

FIG. 11 is an explanatory diagram illustrating an example of a directory.

[Explanation of symbols]

Reference Signs List 1 optical card 2 optical recording area 3 tracking track 4 track 5 track number 6 data area 7 directory area 10 hybrid card 11 IC section 30 optical head 31 information recording / reproducing device 32 host computer 33 MPU 34 AT / AF control circuit 35 modulation / demodulation circuit 36 Head feed motor 37 Card feed motor 38 Light beam irradiation optical system 39 Photodetector 40 AF actuator 41 AT actuator 42 IC section access terminal 50 File name 51 File length 52 Sector address of first data 53 Date and time 60 Inside IC section Master file 6l Elementary file 62 for recording the directory of the IC part 62 Specific elementary file for recording the ID unique to the card 63 D for recording the directory of the IC part Card-specific ID that is recorded in the mental re-file 64 specific position

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 19/04 521 G11B 19/04 521

Claims (3)

[Claims] In a composite record carrier in which a plurality of first to n-th recording regions are arranged on the same carrier, an ID unique to each record carrier is recorded at a specific position in a first recording area, When recording or reproducing information in a recording area other than the first recording area, first, an ID is reproduced from a specific position in the first recording area, and based on the reproduced ID, a physical or physical information is recorded or reproduced. A method for preventing alteration of a composite record carrier, comprising changing a logical position. 2. In a composite record carrier in which a plurality of first to n-th record areas are arranged on the same carrier, an ID unique to each record carrier is recorded at a specific position in a first recording area, When recording or reproducing information in a recording area other than the first recording area, first, an ID is reproduced from a specific position in the first recording area, and based on the reproduced ID, a physical or physical information is recorded or reproduced. A method for preventing falsification of a composite record carrier, characterized by changing a logical position, wherein the composite record carrier has an IC section having a non-volatile memory and a CPU in a first recording area, and a second recording area in a second recording area. A write-once optical recording unit,
A hybrid card that records at least data in the optical recording section and records at least the management information of the data in addition to the ID in the IC section. A method for preventing alteration of a composite record carrier, comprising: changing a physical position of a sector in which recording and reproduction are performed based on the information. 3. In a composite record carrier in which a plurality of first to n-th record areas are arranged on the same carrier, an ID unique to each record carrier is recorded at a specific position in a first recording area. When recording or reproducing information in a recording area other than the first recording area, first, an ID is reproduced from a specific position in the first recording area, and based on the reproduced ID, a physical or physical information is recorded or reproduced. A method for preventing falsification of a composite record carrier, comprising changing a logical position, wherein the composite record carrier has a first recording area of a write-once type optical recording section and a second recording area of a non-volatile memory. And an IC unit having a CPU.
A hybrid card that records at least data in addition to the ID in the optical recording section and records at least the management information of the data in the IC section. When recording or reproducing information in the IC section, the hybrid card is based on the ID. A method for preventing alteration of a composite record carrier, characterized in that the file ID of a file to be recorded and reproduced is changed.