JP3645329B2 - Magnetic card issuing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic card issuing machine that issues a magnetic card.
[0002]
[Prior art]
In magnetic card processing machines that process magnetic information of magnetic cards used for station service applications, distribution applications, etc., there is a high need for easy and stable processing, but recorded information can be easily read and decoded by a third party. A method that cannot be tampered with is desired.
[0003]
Conventionally, a method of multilayering a recording magnetic layer with materials having different characteristics of magnetic properties has been devised. However, since the characteristics of the magnetic material have not changed significantly, the recording magnetic layer has not had sufficient protection ability.
[0004]
What has been devised so far is, for example, applied to a card in a two-layer configuration of a high holding force material and a low holding force material, and different information is recorded in the high holding layer (3000 Oe: Oersted) and the low holding layer (300 Oe). However, in order to stably record independent information on the high-retention recording magnetic body and the low-retention recording magnetic body, the difference in this retention force is small at present, causing mutual interference or essentially rewriting. Has the disadvantage that is possible. That is, the magnetic card may be forged or tampered.
[0005]
[Problems to be solved by the invention]
As described above, an object of the present invention is to provide a magnetic card issuing machine that eliminates the disadvantage that a magnetic card may be counterfeited or tampered with, and can prevent forgery or tampering of the magnetic card.
[0006]
[Means for Solving the Problems]
The magnetic card processor of the present invention includes a magnetic layer including a first magnetic body capable of high-retention rewritable magnetic data and a second magnetic body containing MnBi and difficult to rewrite once a magnetic field is applied. When a magnetic card having a magnetic card and a magnetic card conveyed by the conveyance unit are issued, the first magnetic body and the second magnetic body in the first area of the magnetic card are in an information erasing state. A direct current magnetic field is applied to the first magnetic body and the second magnetic body in a second region different from the first region of the magnetic card. Noise data Format data is recorded on the first area of the magnetic card processed by the first magnetic head, and the second area is recorded with the format data. Basic issue information for A second magnetic head for recording; Basic issue information And a third magnetic head for reading magnetic information recorded in the first area and the second area of the magnetic card processed by the first magnetic head and the second magnetic head Based on the reading result by the third magnetic head, it is confirmed whether or not the format data is correctly recorded in the first area, and the contents read from the second area and the memory are stored in the memory. Superimposition of stored basic issue information and noise data A control unit that compares whether or not they match, and confirms the validity of the magnetic card; an issuing unit that issues a magnetic card when the validity of the magnetic card is confirmed as a result of the confirmation of the control unit; and the control If the correctness of the magnetic card is confirmed as a result of checking the card, the correct card issuance is guided. If the validity of the magnetic card cannot be confirmed, the card issuance error is indicated and the information to be recorded on the magnetic card is specified. Operation panel.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(Example 1)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0017]
1 and 2 show a magnetic card coated with a magnetic material such as a commuter pass, a ticket, and a prepaid card used in transportation, distribution, and the like. Here, a prepaid card as a magnetic card having a price function such as an amount of money is described as an example.
[0018]
That is, as shown in FIG. 1, the magnetic card 1 is provided with a magnetic layer 3 in which a high-retention recording magnetic material and another magnetic material are mixed on a base layer 2. The base layer 2 is made of PET (polyethylene terephthalate) or paper.
[0019]
The magnetic layer 3 has a high retention recording magnetic material composed of barium ferrite and a low retention force by a special treatment at first. However, once it is exposed to a magnetic field, the retention force becomes extremely high. S magnetic material having characteristics (recording with a conventional magnetic head is difficult) {for example, MnBi (manganese bismuth) magnetic powder, whose holding power varies greatly between the initial state and after exposure to a magnetic field} A mixture is applied to the base layer 2.
[0020]
The magnetic layer 3 of the magnetic card 1 has two tracks, a one-time recording track (issue information track) 4 and a read / write track (usage track) 5 as shown in FIG.
[0021]
The one-time recording track (issue information track) 4 records noise data as concealment information at the time of issuance, that is, in an initial state. The recording magnetic body 4b is a track that records and retains the recorded content at a high level, and the recording magnetic flux recorded on both the magnetic bodies 4a and 4b can be read even during reading.
[0022]
In the one-time recording track 4, once the magnetic field is exposed, the S magnetic body 4 a changes to a remarkably high holding force, and the S magnetic body 4 a cannot be recorded again, and noise data as concealment information is obtained. For example, information that is recorded only at the time of issuance (information that cannot be rewritten once it is recorded at the time of issuance) is recorded. As a result, the S magnetic body 4a of the one-time recording track 4 cannot be rewritten, so that recording that is difficult to falsify is possible.
[0023]
Further, the basic issue information of the magnetic card 1 is recorded on the high-retention recording magnetic body 4b of the one-time recording track 4 after the recording of the noise data. At this time, the stored contents of the S magnetic body 4a are retained without being rewritten.
[0024]
The basic issuance information is information indicating the amount of issue, the issuing institution, and the scope of the application system, and issuance number as card ΙD. In addition, protection information such as an encryption key is recorded.
[0025]
As shown in FIG. 3, the noise data recorded on the S magnetic body 4a of the one-time recording track 4 and the basic issue information recorded on the high retention recording magnetic body 4b are recorded with different frequency bands. The frequency band (high frequency) of the noise data is higher than the frequency band (low frequency) of the basic issue information.
[0026]
The read / write track (usage track) 5 is erased by applying a DC magnetic field (application of a magnetic field) at the time of issuance, that is, in an initial state. The high-retention recording magnetic body 5b erases the high-retention recording information and no information is recorded. If the recording is further performed with a high holding force, the S magnetic body 5a is changed to a remarkably high holding force and does not contribute to the recording. However, the high holding recording magnetic body 5b can be recorded, read and rewritten as usual.
[0027]
The read / write track (usage track) 5 is used as a recording area for sequential information such as a past record for each use (transactions such as consideration) and a remaining amount record (billing information). That is, as information generated for each use, a usage record and remaining amount information such as a used amount, a code indicating purchased property information, a processing date and time, a processed place, and a remaining amount are recorded. Since this track is repeatedly recorded and read each time it is used, it is a track that must be rewritten.
[0028]
In this way, the magnetic card 1 having the same magnetic structure can be switched to an application having a different property by the first processing, and this can prevent falsification.
[0029]
FIG. 4 is a cross-sectional view showing a configuration of a main part of the magnetic card issuing machine.
[0030]
That is, on the left side of the main body 11 in the figure, a stacker 12 in which a plurality of magnetic cards 1 before issue are stored is provided. The magnetic cards 1 of the stacker 12 are taken out one by one by a take-out roller 13 and are carried by a carrying path 14. The transport path 14 is provided with transport rollers 15 for transporting the magnetic card 1. Also, in the transport path 14, write heads 16 and 17 for recording information on the magnetic card 1 taken out by the take-out roller 13 or erasing with a DC magnetic field, and a read head for reading information recorded on the magnetic card 1. 18 are sequentially provided. The magnetic card 1 read by the reading head 18 is issued from an issue port 19 provided at the end portion of the conveyance path 14.
[0031]
The magnetic card 1 is transported on the transport path 14 in the transport direction a shown in FIG.
[0032]
The write heads 16 and 17 can separately apply a magnetic field for recording or erasing to the one-time recording track 4 and the read / write track 5, respectively.
[0033]
The read head 18 can separately read the one-time recording track 4 and the read / write track 5.
[0034]
FIG. 5 is a block diagram showing the configuration of the control circuit of the magnetic card issuing machine.
[0035]
That is, the control unit 21 controls the entire magnetic card issuing machine. The control unit 21 includes an operation panel 22 for inputting issuance contents and the like, a driver 24 for driving the transport mechanism 23 by the take-out roller 13 and the transport rollers 15,..., A driver 25 for driving the write head 16, and a write head 17 And a reading circuit 27 for determining the content read by the reading head 18 are connected.
[0036]
The control unit 21 supplies write data to the write heads 16 and 17 to the drivers 25 and 26 after performing MFM modulation, for example, by a modulation circuit (not shown). This modulation circuit may be provided in each driver 25, 26, or may be provided between each driver 25, 26 and the control unit 21.
[0037]
Next, the issuing process of the magnetic card 1 will be described with reference to the flowchart shown in FIG.
[0038]
That is, the operation panel 22 designates the amount of issue, the issuing institution, the application system range and the issue number as the card issue conditions, and inputs a start key (not shown) (ST1).
[0039]
Then, the controller 21 drives the transport mechanism 23 by the driver 24 to rotate the take-out roller 13 and the transport rollers 15. As a result, the magnetic card 1 stored in the stacker 12 is taken out by the take-out roller 13 and carried by the carrying path 14 (ST2).
[0040]
Next, the control unit 21 supplies encoded data of noise data of a predetermined frequency as a concealment information and a DC erasure signal to the write head 16 via the driver 25 (ST3). This noise data is changed randomly.
[0041]
Thereby, noise data as concealment information is recorded by the write head 16 on the S magnetic body 4a and the high retention recording magnetic body 4b of the one-time recording track 4, and a DC erasing magnetic field is applied to the read / write track 5, It is erased (ST4).
[0042]
As a result, noise data is recorded on the S magnetic body 4a of the one-time recording track 4 with a remarkably high holding force, and the S magnetic body 5a of the read / write track 5 enters an erased state with a remarkably high holding force.
[0043]
At this time, the control unit 21 stores the basic issue information in an internal memory (not shown).
[0044]
Next, the control unit 21 provides information indicating the range of the amount / issuing institution / applicable system in issuance as basic issuance information corresponding to the issuance condition of the card designated by the operation panel 22, and issuance number encoding information as card ΙD. (The predetermined frequency lower than the frequency of the noise data) and the encoding information of the format data as the initial value information are supplied to the write head 17 via the driver 26 (ST5).
[0045]
As a result, the noise data recorded on the high-maintenance recording magnetic body 4b of the one-time recording track 4 is rewritten by the write head 17, and information indicating the amount, issuing organization, and applicable system range in issuing as basic issuing information The issue number is recorded as card D, and initial value information such as format data is recorded in the read / write track 5 (ST6).
[0046]
As a result, high-frequency noise data is recorded on the S magnetic body 4a of the one-time recording track 4 with a remarkably high holding force, and low-frequency basic issuance information as shown in FIG. The recorded S magnetic body 5a of the read / write track 5 is in an erased state with a remarkably high holding force, and format data is recorded on the high holding recording magnetic body 5b.
[0047]
Further, the reading head 18 reads the one-time recording track 4 and the read / write track 5, and the read contents are supplied to the control unit 21 via the reading circuit 27 (ST7).
[0048]
As a result, the control unit 21 compares whether the content read from the one-time recording track 4 and the basic issuance information recorded in the internal memory and the superimposed noise data match, / The validity of the magnetic card 1 is confirmed depending on whether the format data is correctly recorded according to the read contents from the write track 5 (ST8).
[0049]
As a result, when the validity of the magnetic card 1 is confirmed, the control unit 21 guides the correct card issuance through the operation panel 22 and issues the magnetic card 1 from the issue port 19 (ST9).
[0050]
If the validity of the magnetic card 1 is not confirmed in step 8, the control unit 21 guides the card issuance abnormality through the operation panel 22, and ejects the magnetic card 1 from the issuing port 19 (ST10). .
[0051]
In addition, the magnetic card 1 that has been issued abnormally may be collected in a collection box (not shown).
[0052]
FIG. 8 is a cross-sectional view showing a configuration of a main part of the magnetic card processing machine.
[0053]
That is, an insertion port 32 into which the magnetic card 1 is inserted is provided on the right side of the main body 31 in the figure. The magnetic card 1 inserted into the insertion slot 32 is transported on the transport path 34 by transport rollers 33. The magnetic card 1 taken into the main body 31 is transported on the transport path 34 by the reverse rotation of the transport rollers 33,. A reading head 35 that reads information on the magnetic card 1 and a writing head 36 that records information on the magnetic card 1 are provided in the conveyance path 34. The read head 35 reads information from the magnetic card 1 inserted through the insertion slot 32 or reads the recorded information from the magnetic card 1 on which information is recorded by the write head 36. The write head 36 records information on the magnetic card 1 being conveyed.
[0054]
The magnetic card 1 is transported on the transport path 34 in the transport direction b shown in FIG.
[0055]
The write head 36 can apply a magnetic field for recording or erasing separately to the one-time recording track 4 and the read / write track 5.
[0056]
The reading head 35 can separately read the one-time recording track 4 and the read / write track 5.
[0057]
FIG. 9 is a block diagram showing the configuration of the control circuit of the magnetic card processor.
[0058]
That is, the control unit 41 controls the entire magnetic card processor. The control unit 41 includes an operation panel 42 for inputting processing contents, a driver 44 for driving a transport mechanism 43 by transport rollers 33, and a reading circuit for demodulating the content read by the read head 35 by, for example, inverse conversion of MFM modulation. 45 and a driver 46 for driving the write head 36 are connected.
[0059]
The reading circuit 45 is provided with a low-pass filter 45a. The low-pass filter 45a removes a high-frequency signal from the read signal from the read head 35 and outputs it. For example, as shown in FIG. 10, the high-frequency noise recorded on the one-time recording track 4 When the data and the low-frequency issue information are superimposed and read, the high-frequency noise data is removed and only the low-frequency issue information as shown in FIG. 7 is output (extracted). .
[0060]
Next, the use process of the magnetic card 1 issued by the issue process will be described with reference to the flowchart shown in FIG.
[0061]
That is, when insertion of the magnetic card 1 from the insertion slot 32 is detected by a detector (not shown) (ST31), the control unit 41 drives the transport mechanism 43 by the driver 44, thereby correcting the transport rollers 33,. Rotate in the direction. Thereby, the magnetic card 1 inserted from the insertion port 32 is conveyed by the conveyance path 34 (ST32).
[0062]
Next, the magnetic card 1 is read by the read head 35. That is, the amount, issuing organization, and application system in the issuance as the high-frequency noise data recorded on the S magnetic body 4a of the one-time recording track 4 and the low-frequency basic issuance information recorded on the high retention recording magnetic body 4b Information indicating the range of the card, reading the issuance number as card ΙD, and reading the usage record such as the remaining amount recorded on the high-retention recording magnetic body 5b of the read / write track 5, and the read content is read circuit 45. And is supplied to the control unit 41 (ST33).
[0063]
At this time, the high-frequency noise data recorded on the one-time recording track 4 and the low-frequency issue information are superimposed and read by the read head 35 by the low-pass filter 45a in the reading circuit 45, as shown in FIG. In this case, high-frequency noise data is removed, and only low-frequency issue information as shown in FIG. 7 is extracted and output.
[0064]
The control unit 41 determines the legitimacy of the read basic issuance information (ST34), and if it is determined to be legitimate, calculates the remaining amount as a new usage record obtained by subtracting the charge for the current process from the remaining amount (ST35). At this time, the fee for the current process is designated by the operation panel 42, for example.
[0065]
Next, the control unit 41 supplies the remaining encoding information as a new usage record to the write head 36 via the driver 46 (ST36).
[0066]
Thus, the remaining amount as a new usage record is recorded on the read / write track 5 by the write head 36 (ST37).
[0067]
Thereafter, the controller 41 drives the transport mechanism 43 by the driver 44 to rotate the transport rollers 33,... In the reverse direction. Thereby, the magnetic card 1 written by the write head 36 is conveyed to the insertion port 32 side by the conveyance path 34 (ST38).
[0068]
Next, the read / write track 5 is read by the reading head 35, and the read contents of the read / write track 5 are demodulated by the reading circuit 45 and supplied to the control unit 41 (ST39).
[0069]
As a result, the control unit 41 determines the legitimacy of the magnetic card 1 based on the coincidence of the read contents of the read / write track 5 with the recorded new usage record (ST40), and guides the normal process through the operation panel 42. The magnetic card 1 is discharged from the insertion slot 32 (ST41).
[0070]
If the validity of the basic issue information read in step 34 is not determined, or if the validity of the magnetic card 1 is not determined in step 41, the control unit 41 determines that the received magnetic card 1 is an abnormal ticket. The fact is guided by the operation panel 22, and the magnetic card 1 is ejected from the insertion slot 32 (ST42).
[0071]
As described above, in the case where the one-time recording track is composed of a mixture of two types of S magnetic material and high retention recording magnetic material, high-frequency noise data is recorded on the S magnetic material, and low recording on the high retention recording magnetic material. When the issuance information to be concealed is recorded, that is, when the noise data and the issuance information are recorded in a multiplexed manner on the one-time recording track, and the noise data and the issuance information are superimposed and read during processing, The noise data is discriminated by a low-pass filter so that only low-frequency issue information can be extracted and read. This is intended to prevent tampering and counterfeiting.
[0072]
That is, high-frequency noise data is recorded on the S magnetic body 4a of the one-time recording track 4, and low-frequency secret issue information is recorded on the high retention recording magnetic body 4b. In this state, in order to effectively rewrite (falsify and forge) the recorded content (issue information) of the high-retention recording magnetic body 4b, only the issue information is extracted from the signal in which the issue information and the noise data are superimposed. Technology is required, and for this purpose, it is necessary to decipher the concealment method and the data reading method, so that tampering and forgery cannot be performed.
[0073]
For example, in response to an attack such as tampering, only the noise data of the S magnetic body 4a of the one-time recording track 4 remains, the recorded content (issue information) of the high retention recording magnetic body 4b disappears, and tampering and forgery are performed. I can't do that.
[0074]
In addition, using the characteristics of the one-time recording track 4, it is linked with an issue number, an encryption key, etc., and important data is scrambled with a functional expression, and this is also recorded on the read / write track 5. Thus, the relationship between the one-time recording information and the rewrite recording information can be created to prevent falsification.
[0075]
That is, X = F (A, B) is obtained on the one-time recording track 4 from the above two values with the issue number: A, the encryption key: B, and X is also recorded.
[0076]
The read / write track 5 has a use result key (random number for each use): C, a remaining use amount: D, the above two values, an issue number A in the one-time recording track 4, and an encryption key B. = G (A, B, C, D) is obtained, and this Y is recorded.
[0077]
As a countermeasure against fraud in this case, the state of the one-time recording track 4 cannot be created unless an S magnetic material is used.
[0078]
In the case of copying only the read / write track 5, the recorded contents of the one-time recording track 4 are always different in the issue number: A, the encryption key: B, and X = F (A, B). Since Y in the write track 5 is also different, even if the read / write track 5 is copied from another, there is a mismatch.
[0079]
When data before use is stored in the read / write track 5 and copy processing is performed to restore the data after use, a check is made at a punch hole at the start of use, which has been performed conventionally.
[0080]
In the above embodiment, the magnetic card has been described in which the magnetic layer formed by mixing the high retention recording magnetic material and the S magnetic material is applied over the entire surface of the magnetic card on the base layer. Not limited to this, as shown in FIG. 12, the high-retention recording magnetic body 51 and the S magnetic body 52 may be applied in a two-layer structure over the entire surface of the magnetic card 1 on the base layer 2.
[0081]
In this case, the issuing process shown in FIG. 6 and the use process shown in FIG. 11 can be implemented in the same manner.
[0082]
Further, as shown in FIG. 13, in the magnetic card, the S magnetic material 53 is applied only to the portion of the one-time recording track 4 on the base layer 2, and the high retention recording magnetic material is applied only to the read / write track 5 portion. 54 may be applied.
[0083]
In this case, the issuing process shown in FIG. 6 and the use process shown in FIG. 11 can be implemented in the same manner.
[0084]
Further, as shown in FIG. 14, in the magnetic card, the high retention recording magnetic body 55 is applied over the entire surface of the magnetic card 1 on the base layer 2, and the S magnetic body 56 is applied only to the portion of the one-time recording track 4 thereon. You may make it apply | coat (two-layer structure).
[0085]
In addition, as shown in FIG. 15, in the magnetic card, a magnetic layer 57 (a mixture of two types) in which the S magnetic material and the high retention recording magnetic material are mixed only in the portion of the one-time recording track 4 on the base layer 2. The high retention recording magnetic body 58 may be applied over the entire surface other than the one-time recording track 4.
[0086]
14 and 15, the issuing process shown in FIG. 6 and the use process shown in FIG. 11 can be similarly performed.
[0087]
(Example 2)
In the second embodiment, encrypted data such as a high-frequency encryption key is recorded on the S magnetic body 4a of the one-time recording track 4, and the issue information to be concealed in the high retention recording magnetic body 4b is encrypted by the encryption key. A case where the converted data is recorded at a low frequency will be described.
[0088]
In this case, the encryption key is recorded in place of the noise data in the S magnetic body 4a of the one-time recording track 4 described in the first embodiment, and this issuance information is stored in the high retention recording magnetic body 4b in place of the issuance information. The data encrypted by the encryption key is recorded, and the replacement can be performed in substantially the same manner in the description of FIGS.
[0089]
However, the configuration of the control circuit of the magnetic card processor shown in FIG. 9 is such that the high-pass filter 45b is added to the reading circuit 45 in addition to the low-pass filter 45a, and the encryption is controlled by the control unit 41 as shown in FIG. With the addition of the decryption unit 47, the flowchart for explaining the magnetic card issuance process shown in FIG. 6 is changed as shown in FIG. 17 and the use process of the magnetic card shown in FIG. 11 is explained. The flowchart for doing so is changed as shown in FIG.
[0090]
That is, the low-pass filter 45a removes a high-frequency signal from the read signal for the one-time recording track 4 by the reading head 35 and outputs the signal. For example, as shown in FIG. When the recorded high-frequency encryption key and the data in which the low-frequency issue information is encrypted are read and superimposed, the high-frequency encryption key is removed and the low-frequency encryption key as shown in FIG. Only the data in which the frequency issuance information is encrypted is output. The encrypted data from the low-pass filter 45a is output to the decryption unit 47 via a demodulation unit (not shown).
[0091]
The high-pass filter 45b removes and outputs a low-frequency signal from the read signal for the one-time recording track 4 by the reading head 35. For example, as shown in FIG. When the encrypted data of the high frequency encryption key and the low frequency issuance information is read and superimposed, the data that the low frequency issuance information is encrypted is removed and the high frequency Only the encryption key is output. The encryption key from the high-pass filter 45b is output to the decryption unit 47 via a demodulation unit (not shown).
[0092]
Output.
[0093]
The decryption unit 47 decrypts the encrypted data from the low-pass filter 45b based on the encryption key from the high-pass filter 45a, and outputs issuance information as confidential information to the control unit 41 as a decryption result. It is like that.
[0094]
Next, the issuing process of the magnetic card 1 will be described with reference to the flowchart shown in FIG.
[0095]
That is, the operation panel 22 designates the amount of issue, the issuing institution, the application system range and the issue number as the card issue conditions, and inputs a start key (not shown) (ST51).
[0096]
Then, the controller 21 drives the transport mechanism 23 by the driver 24 to rotate the take-out roller 13 and the transport rollers 15. As a result, the magnetic card 1 stored in the stacker 12 is taken out by the take-out roller 13 and carried by the carrying path 14 (ST52).
[0097]
Next, the control unit 21 supplies encoded information obtained by MFM-modulating an encryption key having a predetermined frequency as concealment information by a modulation circuit (not shown) and a DC erase voltage to the write head 16 via the driver 25 (ST53). . The encryption key may be changed randomly.
[0098]
As a result, an encryption key as concealment information is recorded by the write head 16 on the S magnetic body 4a and the high retention recording magnetic body 4b of the one-time recording track 4, and a DC erasing magnetic field is applied to the read / write track 5. Is erased (ST54).
[0099]
As a result, the encryption key is recorded on the S magnetic body 4a of the one-time recording track 4 with a remarkably high holding force, and the S magnetic body 5a of the read / write track 5 enters an erased state with a remarkably high holding force.
[0100]
Subsequently, the control unit 21 uses the above-mentioned encryption number as the card issue D as the information indicating the range of the amount / issuing institution / applicable system in the issuance as basic issuance information corresponding to the issuance condition of the card designated by the operation panel 22 Encoding information obtained by MFM-modulating the data encrypted with the encryption key (a predetermined frequency lower than the frequency of the encryption key) and the encoding information of the format data as initial value information are written via the driver 26 to the write head 17. (ST55).
[0101]
As a result, the encryption key recorded on the high-retention recording magnetic body 4b of the one-time recording track 4 is rewritten by the write head 17, and represents the amount, issue organization, and applicable system range in issue as basic issue information. Information and data with the issue number encrypted are recorded as card ID D, and initial value information such as format data is recorded on the read / write track 5 (ST56).
[0102]
As a result, the S magnetic body 4a of the one-time recording track 4 records a high-frequency encryption key with a remarkably high holding force, and the high-retention recording magnetic body 4b has low-frequency data (basic data) as shown in FIG. Data in which issuance information is encrypted) is recorded, the S magnetic body 5a of the read / write track 5 is in an erased state with a remarkably high holding force, and format data is recorded in the high holding recording magnetic body 5b.
[0103]
Further, the reading head 18 reads the one-time recording track 4 and the read / write track 5, and the read contents are supplied to the control unit 21 via the reading circuit 27 (ST57).
[0104]
As a result, the control unit 21 compares whether the content read from the one-time recording track 4 and the basic issuance information that has been recorded are the same as the one obtained by superimposing the encrypted data and the encryption key. The validity of the magnetic card 1 is confirmed depending on whether the format data is correctly recorded according to the read contents from the write track 5 (ST58).
[0105]
As a result, when the validity of the magnetic card 1 is confirmed, the control unit 21 guides the correct card issuance through the operation panel 22 and issues the magnetic card 1 from the issue port 19 (ST59).
[0106]
If the legitimacy of the magnetic card 1 is not confirmed in step 58, the control unit 21 guides the card issuance abnormality through the operation panel 22, and ejects the magnetic card 1 from the issuance port 19 (ST60). .
[0107]
In addition, the magnetic card 1 that has been issued abnormally may be collected in a collection box (not shown).
[0108]
Next, the use process of the magnetic card 1 issued by the issue process will be described with reference to the flowchart shown in FIG.
[0109]
That is, when insertion of the magnetic card 1 from the insertion slot 32 is detected by a detector (not shown) (ST61), the control unit 41 drives the transport mechanism 43 by the driver 44 to correct the transport rollers 33,. Rotate in the direction. Thereby, the magnetic card 1 inserted from the insertion slot 32 is conveyed by the conveyance path 34 (ST62).
[0110]
Next, the magnetic card 1 is read by the read head 35. That is, the encrypted data of the high frequency encryption key recorded on the S magnetic body 4a of the one-time recording track 4 and the low frequency basic issue information recorded on the high holding recording magnetic body 4b is read. The read content is demodulated by the reading circuit 45 and supplied to the decryption unit 47 (ST63).
[0111]
In this case, as shown in FIG. 10, when the high-frequency encryption key recorded on the one-time recording track 4 and the data obtained by encrypting the low-frequency issuance information are superimposed and read by the reading head 35. Further, the high-frequency encryption key is removed by the low-pass filter 45a in the reading circuit 45, and only the data in which the low-frequency issue information is encrypted as shown in FIG. 7 is extracted and output.
[0112]
Further, the high-pass filter 45b in the reading circuit 45 removes the data in which the low-frequency issue information is encrypted, and only the high-frequency encryption key is extracted and output.
[0113]
The data and the encryption key obtained by encrypting the issue information are demodulated and supplied to the decryption unit 47.
[0114]
The decryption unit 47 decrypts the encrypted data based on the supplied encryption key, and determines the amount of money, the issuing institution, and the applicable system in the issue as the secret information as the decryption result. The issue number is output to the control unit 41 as the information to be displayed and the card D of the card (ST64).
[0115]
In step 63, the usage record such as the remaining amount recorded on the high-retention recording magnetic body 5b of the read / write track 5 is read, and the read contents are demodulated by the reading circuit 45 and sent to the control unit 41. Supplied.
[0116]
The control unit 41 determines the legitimacy of the decrypted basic issue information (ST65), and if it is determined to be legitimate, calculates the remaining amount as a new usage record obtained by subtracting the charge for the current process from the remaining amount (ST66). At this time, the fee for the current process is designated by the operation panel 42, for example.
[0117]
Next, the control unit 41 supplies the remaining encoding information as a new usage record to the writing head 36 via the driver 46 (ST67).
[0118]
As a result, the remaining amount as a new usage record is recorded on the read / write track 5 by the write head 36 (ST68).
[0119]
Thereafter, the controller 41 drives the transport mechanism 43 by the driver 44 to rotate the transport rollers 33,... In the reverse direction. As a result, the magnetic card 1 written by the write head 36 is transported to the insertion slot 32 side by the transport path 34 (ST69).
[0120]
Next, the read / write track 5 is read by the reading head 35, and the read contents of the read / write track 5 are demodulated by the reading circuit 45 and supplied to the control unit 41 (ST70).
[0121]
As a result, the control unit 41 determines the legitimacy of the magnetic card 1 based on the coincidence of the read contents of the read / write track 5 with the recorded new usage record (ST71), and guides the normal process through the operation panel 42. The magnetic card 1 is discharged from the insertion slot 32 (ST72).
[0122]
If the legitimacy of the magnetic card 1 is not determined in step 71, the control unit 41 guides through the operation panel 22 that the received magnetic card 1 is an abnormal ticket, and inserts the magnetic card 1 into the insertion slot. 32 is discharged (ST73).
[0123]
As described above, when the one-time recording track is composed of two types of S magnetic material and high retention recording magnetic material or a two-layer structure, the encryption key is recorded on the S magnetic material at a high frequency and high retention is achieved. Data obtained by encrypting the issuance information to be concealed in the magnetic recording material with the encryption key is recorded at a low frequency, and is encrypted with the encryption key from the superimposed signal read from the one-time recording track during processing. Data is extracted using a high-pass filter and a low-pass filter, respectively, and the encrypted data is decrypted as issue information using an encryption key. This is intended to prevent tampering and counterfeiting.
[0124]
Further, encrypted data such as a high-frequency encryption key recorded on the S magnetic body 4a of the one-time recording track 4 may be recorded at a narrow band of high frequency.
[0125]
In this case, the encryption key recorded in the S magnetic body 4a at the time of issuance is narrowed by 75% compared to the modulation of the original MFM modulation method by adding a specific restriction to the data pattern of the MFM modulation method in the modulation circuit. It is recorded by the modulation.
[0126]
That is, in order to narrow the reproduction frequency band, the 1T, 1.5T, and 2T periodic patterns of the original MFM modulation as shown in FIG. 19 are limited to the information patterns as shown in FIG. The modulation data is composed only of 5T.
[0127]
In the case of the original MFM modulation, “00”, “11”, 1T, “01”, “10”, 1.5T, “101”, 2T, In the case of “,” modulation to 2T is prohibited, for example, by adding “00” between each piece of information. At this time, since the information amount of the encryption key is small, even if the recording information amount is reduced due to this prohibition condition, it is not a limiting factor.
[0128]
Therefore, although the amount of information is reduced, it is possible to easily create limited condition data.
[0129]
As a result, as shown in FIG. 21, data in which the issue information is encrypted is recorded in a frequency band of f1 or lower, and the encryption key is 25% narrower than f2 to f5, which is the original frequency band by MFM modulation. Recording is performed in the frequency band of f2 to f4.
[0130]
It is MFM limited condition modulation in the frequency band of “f4 = 1.5 × f2”.
[0131]
Further, encrypted data such as a high-frequency encryption key recorded on the S magnetic body 4a of the one-time recording track 4 may be recorded with a frequency deviation as shown in FIG.
[0132]
When high-density recording such as the above-described encryption key is not required, recording by frequency deviation as a narrower band modulation method can be used.
[0133]
Assuming that the recording frequency is f0, this is recorded with a deviation of ± 10% in accordance with the information as follows.
[0134]
As an example of recorded information, information can be recorded by setting “11” for a positive change point, “10” for a negative change point, and “00” if there is no change point.
[0135]
The frequency band in this case is ± 10% with respect to the center frequency f0, which is narrower than the above-described method using the MFM limited condition modulation.
[0136]
A frequency deviation extraction circuit for extracting the frequency deviation will be described. This frequency deviation extraction circuit is provided in the reading circuit 45 of FIG.
[0137]
That is, as shown in FIG. 23, the frequency deviation extraction circuit includes an amplifier 61, a high-pass filter 62, a binarization circuit 63, a phase discriminator 64, an integrator 65, and a voltage controlled oscillator VCO 66.
[0138]
The amplifier 61 amplifies the read signal from the read head 35 and outputs a signal as shown in FIG. The high-pass filter 62 extracts high-frequency encrypted data as shown in FIG. 24B from the output of the amplifier 61 and outputs it to the binarization circuit 63. The binarization circuit 63 outputs to the phase discriminator 64 a binarized signal as shown in FIG. 24C in which the encrypted data extracted by the high-pass filter 62 is binarized. The phase discriminator 64 outputs a signal as shown in FIG. 24E corresponding to the phase difference between the output of the binarization circuit 63 and the output of the voltage controlled oscillator VCO 66 to the integrator 65 as a frequency deviation extraction signal. To do. The integrator 65 integrates the output of the phase discriminator 64 and outputs a signal as shown in FIG. 24F to the voltage controlled oscillator VCO 66. The voltage controlled oscillator VCO 66 outputs a signal whose phase is changed as shown in FIG.
[0139]
The phase discriminator 64, the integrator 65, and the voltage controlled oscillator VCO 66 constitute a loop of the PLL circuit.
[0140]
That is, after the read signal from the read head 35 is amplified by the amplifier 61, only the encryption key is extracted by the high pass filter 62 and binarized by the binarization circuit 63. This binarized signal is output to the phase discriminator 64 of the PLL circuit constituting the loop. The phase discriminator 64 is also supplied with an output from a voltage controlled oscillator VCO 66. As a result, the phase discriminator 64 outputs a signal corresponding to the phase difference between the signal from the binarization circuit 63 and the signal from the voltage controlled oscillator VCO 66. This output is integrated by the integrator 65, added with an appropriate time constant, and supplied to the voltage controlled oscillator VCO 66, whereby a signal having a frequency corresponding to the signal from the binarization circuit 63 is output from the voltage controlled oscillator VCO 66. .
[0141]
As a result, when the signal from the binarization circuit 63 shifts, a signal corresponding to the shift is output by the output of the voltage controlled oscillator VCO 66 as an error signal of the PLL circuit.
[0142]
As a result, the voltage controlled oscillator VCO 66 can detect the frequency deviation according to the phase difference.
[0143]
Also, when detecting the frequency deviation, if the speed stability of the conveyance system of the magnetic card 1 becomes a problem for recording and detection, recordings having the opposite signs of the deviation state are synchronized with each other. The frequency deviation is recorded in the opposite phase to another track, that is, two tracks. By detecting each of these deviations and taking the difference, the speed fluctuation of the transport system is canceled out, and a signal having only a frequency deviation can be obtained.
[0144]
That is, the frequency deviation is recorded on the two tracks in opposite phases.
[0145]
A frequency deviation signal of “f0 (t)” is recorded on one track, and a negative phase frequency deviation signal of “−f0 (t)” is recorded on two tracks.
[0146]
However, at the time of issuance, a frequency deviation signal in which the fluctuation of the conveyance speed system of “f0 (t) + fv1 (t)” is added to one track due to the fluctuation of the conveyance speed system of the issuing machine is recorded. -F0 (t) + fv1 (t) "is recorded as a signal of the frequency deviation of the reverse phase to which the fluctuation of the transport speed system is added.
[0147]
Further, at the time of reading, a signal of a frequency deviation is read from the one track, to which the fluctuation of the conveyance speed system of “f0 (t) + fv1 (t) + fv2 (t)” is further added due to the fluctuation of the conveyance speed system of the processor. A negative phase frequency deviation signal is read from the two tracks to which a change in the transport speed system of “−f0 (t) + fv1 (t) + fv2 (t)” is further added. By subtracting the frequency deviation of the two tracks from the frequency deviation of the one track that has been read, it is possible to extract the frequency deviation from which fluctuations in the conveyance speed system during recording and reading have been removed.
[0148]
“{F0 (t) + fv1 (t) + fv2 (t)} − {− f0 (t) + fv1 (t) + fv2} = 2f0 (t)”
In this case, it can be realized by providing a differential amplifier in the reading circuit 45.
[0149]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a magnetic card issuing machine capable of preventing forgery and tampering of a magnetic card.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic configuration of a magnetic card for explaining one embodiment of the present invention.
FIG. 2 is a perspective view for explaining a track configuration of a magnetic card.
FIG. 3 is a diagram for explaining frequency bands of noise data and basic issue information recorded on a one-time recording track.
FIG. 4 is a cross-sectional view showing a configuration of a main part of a magnetic card issuing machine.
FIG. 5 is a block diagram showing a configuration of a control circuit of the magnetic card issuer.
FIG. 6 is a flowchart for explaining magnetic card issuance processing;
FIG. 7 is a diagram showing a signal example of low-frequency issue information.
FIG. 8 is a cross-sectional view showing a configuration of a main part of a magnetic card processing machine.
FIG. 9 is a block diagram showing a configuration of a control circuit of the magnetic card processor.
FIG. 10 is a diagram illustrating an example of a signal in which low-frequency issue information and high-frequency noise data are superimposed.
FIG. 11 is a flowchart for explaining use processing of a magnetic card.
FIG. 12 is a sectional view showing a schematic configuration of a magnetic card.
FIG. 13 is a perspective view showing a schematic configuration of a magnetic card.
FIG. 14 is a perspective view showing a schematic configuration of a magnetic card.
FIG. 15 is a perspective view showing a schematic configuration of a magnetic card.
FIG. 16 is a block diagram showing a configuration of a control circuit of the magnetic card processor.
FIG. 17 is a flowchart for explaining magnetic card issuance processing;
FIG. 18 is a flowchart for explaining use processing of a magnetic card.
FIG. 19 is a diagram for explaining original MFM modulation;
FIG. 20 is a diagram for explaining MFM limited condition modulation;
FIG. 21 is a diagram for explaining a frequency band in which data in which issuance information is encrypted and an encryption key are recorded;
FIG. 22 is a diagram for explaining recording of an encryption key by frequency deviation.
FIG. 23 is a block diagram showing a configuration of a frequency deviation extraction circuit.
FIG. 24 is a signal waveform diagram for explaining a signal waveform of a main part of the frequency deviation extraction circuit.
[Explanation of symbols]
1 ... Magnetic head
2 ... Base layer
3. Magnetic layer
4. One-time recording track (issue information track)
5. Read / write track (used track)
4a, 5a ... S magnetic material
4b, 5b ... high retention recording magnetic material
14 carrying ...
16, 17 ... writing head
18 ... Reading head
21 ... Control unit
41 ... Control unit
42. Operation panel
43 ... Conveying mechanism
44 ... Driver
45. Reading circuit
45a ... Low-pass filter
45b ... High-pass filter
46 ... Driver
47 ... Decryption part

Claims (2)

A transport unit for transporting a magnetic card having a magnetic layer containing a first magnetic body capable of high-retention rewritable magnetic data and a second magnetic body containing MnBi and difficult to rewrite once a magnetic field is applied. When,
When issuing a magnetic card transported by the transport unit, a DC magnetic field is applied to bring the first magnetic body and the second magnetic body in the first area of the magnetic card into an information erasing state, and the magnetic card A first magnetic head for recording noise data on a first magnetic body and a second magnetic body in a second region different from the first region;
Records the formatted data to the first region 5 of the magnetic card which has been processed by the first magnetic head, and a second magnetic head for recording basic issue information against the second region,
A memory for storing the basic issue information ;
A third magnetic head for reading magnetic information recorded in the first area and the second area of the magnetic card processed by the first magnetic head and the second magnetic head;
Based on the reading result by the third magnetic head, it is confirmed whether or not the format data is correctly recorded in the first area 5, and the contents read from the second area and stored in the memory. A controller that confirms whether or not the basic issue information and the superimposition of the noise data match, and confirms the validity of the magnetic card;
As a result of the confirmation of the control unit, when the validity of the magnetic card can be confirmed, an issuing unit that issues the magnetic card,
As a result of the confirmation of the control unit, when the validity of the magnetic card can be confirmed, the correct card issuance is guided, and when the validity of the magnetic card cannot be confirmed, the card issuance abnormality is guided and information recorded on the magnetic card An operation panel for specifying
A magnetic card issuing machine comprising: Said second magnetic head, a magnetic card issuing machine according to claim 1, further comprising a means for recording the fundamental issue information at a different frequency than the noise data.

Images