JPH0584554B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to an identification card having a self-verification function.

[Prior art and its problems]

Recently, in place of cash cards, etc., which have embossed or magnetic stripes on the surface of the card, in order to prevent unauthorized use or forgery due to loss or theft,
Identification cards with an IC chip embedded inside the card, so-called IC cards, are increasingly being used.

Such an IC card is provided with a connection terminal, for example, on the surface or edge of the card, and through this terminal, an external card verification terminal device and the IC chip inside the IC card are electrically connected. The terminal device compares the PIN number pre-stored on the IC chip with the PIN number entered by the card user from the keyboard of the terminal device to verify whether the card user is the actual user. It's summery.

However, although the above-mentioned IC card has the advantage of having a simple structure because only the IC chip is embedded in the card itself, it is necessary to use a terminal device to verify the PIN number. If the card could be used at retail stores, it would be necessary to install expensive terminal equipment at each retail store, which would pose a huge financial burden for those installing the terminal equipment. Ta.

Therefore, the applicant installed a keyboard on the front of the card, and when the user inputs a number from the keyboard, the inside of the card compares the number input from the keyboard with a pre-stored PIN. We propose an identification card that makes it possible to verify the PIN number without using a terminal device by verifying whether the user of the card is the person in question, that is, by providing the card itself with a verification function. He filed a patent application under the title "Identification Card."

However, since such an identification card is usually carried in a pocket of clothing or a bag, the personal identification number is inadvertently input while the card is being carried and is automatically verified. In this case, the wrong number is usually entered.
It is determined that the verification results do not match, and if this happens several times, there is a risk that the card itself will be invalidated and will no longer be usable.

[Purpose of the invention]

This invention was made in view of the above circumstances,
To provide an identification card which prevents erroneous input by preventing verification on the card unless a user consciously inputs a personal identification number.

[Key points of the invention]

That is, the present invention provides a keyboard for the identification card, and inputs verification data (PIN number) from the keyboard while pressing a first verification key for instructing verification, and then releases the first verification key. The verification operation is started by pressing another second verification key, thereby preventing erroneous verification.

[First Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

FIG. 1 is an external view of an identification card to which the present invention is applied, and 1 is the identification card body. On the front side, there is a keyboard 2, a liquid crystal display device 3, and a connector 4.
is provided, and an LSI (not shown) is embedded inside the card. Also, on the back side, there is an emboss (not shown) that shows an identification code etc.
is provided.

The keyboard 2 is provided with a PIN key 2a used for inputting a personal identification number, in addition to numeric keys for inputting numerical data and function keys for instructing various calculations.

In addition, the connector 4 connects the external terminal device and the above LSI.
This is to electrically connect the two to enable the exchange of data.

This identification card 1 has a total thickness of approximately 0.8mm.
The size complies with ISO standards, and it has the functions of both a regular card and a calculator.

The internal structure of this identification card 1 is shown in, for example, Japanese Patent Application No. 1983-33272 filed by the present applicant, so its explanation will be omitted here.

FIG. 2 is a circuit block diagram of this invention.
Reference numeral 10 denotes a key input unit including a keyboard 2, which inputs key operation signals to a CPU (central processing unit) 11 based on key operations.

The CPU 11 includes a clock/calendar circuit 12,
ROM13, RAM14, EEP-ROM (Electronic
An erasable programmable ROM) 15 and a display drive circuit 16 are connected.

The ROM 13 stores micro instructions for executing various instructions, and the RAM 14
is provided with a register for calculations and a register for temporary storage, and various calculations such as arithmetic calculations are executed between the CPU 11 and the RAM 14 under the control of the ROM 13.

Then, the result of the above calculation and the numerical data input from the key input unit 10 are converted into data to be displayed on the liquid crystal by the display drive circuit 16, and then displayed on the liquid crystal display device 3.

On the other hand, the clock/calendar circuit 12 includes a crystal oscillator, a frequency dividing circuit, etc., and measures the current time, calculates the year, month, day, etc. based on the daily change signal, and displays the current time and the like on the liquid crystal display device 3. It is possible to display the month, day, etc.

The EEP-ROM 15 is a ROM in which data can be rewritten by applying a predetermined voltage, and after data has been written, it can retain data like a normal ROM even without a backup power supply. It is.

For this reason, this EEP-ROM 15 is pre-written with verification data such as a PIN number and membership number (hereinafter collectively referred to as the PIN number), and as will be described in detail later, the card user enters the number using the keypad. and,
By comparing the personal identification number stored in the EEP-ROM 15, it is verified whether or not the card user is the person in question.

Therefore, these CPU 11, clock/calendar circuit 12, ROM 13, RAM 14, EEP-ROM
15, and display drive circuit 16 as LSI 17.
It is made of chips.

This LSI 17 is supplied with power by a paper-like battery 18.

FIG. 3 shows the LSI 17 of FIG. 2 in a functional block diagram in order to facilitate understanding of the present invention. Note that the same parts as in FIG. 2 are given the same reference numerals.

The key discrimination section 20 decodes the key operation signal supplied to the key input section 10 and inputted from the key input section 10 to discriminate the key. This key discrimination section 20
are a buffer 20a that temporarily stores key operation signals output from the key input unit 10, and a PIN key 2a.
A detection circuit 20 that detects whether or not is pressed.
b, and when the PIN key 2a is operated, output signals are output from line a, and when other numeric keys and function keys are operated, corresponding output signals are output from bus line b. It is given to the control section 21.

The control unit 21 is connected to a storage unit 22 composed of RAM, an arithmetic circuit 23, and an EEP-ROM 15.

The EEP-ROM 15 includes a booster circuit 15a for boosting the supply voltage to about 21 V when writing data to enable data writing, and an area N (15b) for storing a preset password. Area M (15c) stores the number of times this PIN number and the number entered by the card user from the keyboard are inconsistent as a result of comparison.
It is composed of etc.

The PIN number stored in the area N (15b) is stored in an encrypted form to prevent forgery, etc. When checking, the PIN number is stored in the decoder 24 as a normal binary 10 Converted to base number, Batsuhua 2
It is temporarily stored in 4a. In addition, in order to restore the encrypted PIN, for example, a normal ROM
It is restored by an encoder composed of .

Control of writing and reading of data to and from the EEP-ROM 15 and address designation are performed by the control section 21 via bus lines c and d.

On the other hand, the storage section 22 is provided with arithmetic registers consisting of X, Y, and Z, temporary storage registers consisting of A to D, and the like. The storage unit 22 is
Data is exchanged with the EEP-ROM 15 via bus lines e and f, and bus lines g and h
The control unit 21 performs register designation and input control of numeric data and code data (constants) through the control unit 21.

Note that the A register in the storage unit 22 stores numeric data (PIN code) input from the key input unit 10,
The B register contains area M of EEP-ROM15.
(15c) stores the number of discrepancies, _C0 of the C register stores a flag when the card becomes invalid, and _C1 stores the number of digits of the PIN entered from the keyboard 2. Ru. Storage section 22
is connected to the display processing section 25, and the display data stored in the storage section 22 is displayed on the liquid crystal display device 3 after the display processing section 25 performs appropriate display processing on the display data.

The arithmetic circuit 23 is connected to the storage section 22 and has X,
Perform various calculations using Y and Z registers,
A "+1" operation is performed on the B register to update the number of mismatches. These calculations are performed under the control of the control section 21 via the bus line i.

Further, 26 and 27 are both comparison circuits, and the comparison circuit 26 compares the contents of the buffer 24a with the register A.
This is for comparison or verification with the contents of the . The comparison circuit 27 is for comparing the contents of the B register with a constant "5" given from the control section 21, and determines whether the number of mismatches has reached "5". The comparison circuit 27 also compares the contents of _C1 of the C register with a constant "3" and determines whether the number of key inputs has reached "3". The comparison results of the comparison circuits 26 and 27 are both provided to the control section 21.

Further, a counter 28 is connected to the control section 21 . This counter 28 is for displaying the "OK" display for only 10 seconds when a match is found as a result of the verification of the PIN number, and the counter 28 is designed to display the "OK" display for only 10 seconds when the PIN numbers match. Counting starts with the start signal, and when a carry occurs on line k, the control unit 21 determines that 10 seconds have elapsed.

Next, the operation of the embodiment of the present invention will be explained based on FIGS. 4 and 5.

FIG. 4 schematically shows the actions taken by the card user during verification. For example, if you want to use this card as a credit card instead of shopping at a store and paying for it, first operate the AC key (all clear key) on keyboard 2 to clear the display. (step)
S ₁ ), then, while pressing the PIN key 2a, input a desired number using the number keys on the keyboard 2 (step S ₂ ).

After entering the number, when the PIN key 2a is released (step _S3 ), the internal circuit checks the pre-stored PIN number and the key-in number, and if they match. If there is, "OK" is displayed on the liquid crystal display device 3, and
It turns out that the user of the card is himself (step _S4 ).

Therefore, if the "OK" message is displayed, the store clerk assumes that the card user is the card user and can create a slip by inserting the card into the embossing imprinter in the same way as a normal credit card.

If the numbers entered from the keyboard 2 do not match, "OK" is not displayed, and the user operates the AC key (step S ₁ ) to enter the number again.

Therefore, for example, if a discrepancy occurs five times in a row, the card itself will be invalidated as the user is not the original user, and "EE...E" will be displayed, making it impossible to use the card from now on. (Step _S5 )

The identification card of the present invention is used in this manner. Next, the operation of the circuit block diagram shown in FIG. 3 will be explained with reference to FIG. 5.

When issuing a card, enter the PIN number in advance using EEP
- Store it in area N (15b) of the ROM 15, and clear area M (15c) (step T ₁ ).

Then, during verification, the card user inputs the number using the number keys while pressing the PIN key 2a. At this time, while the PIN key 2a is being pressed, an output signal is given from the key discrimination unit 20 to the control unit 21 via line a, so the control unit 21 determines that the PIN key 2a is being pressed. (Step T ₂ ), the subsequent input data is sequentially input from the key discrimination section 20a to the A register of the storage section 22 as numerical data by the control section 21, and is also displayed on the liquid crystal display device 3 ( Step _T3 ).

Therefore, in step _T4 , every time data is input from the keyboard 2, the arithmetic circuit 23
_C1 of the register is incremented by "+1", and the number of digits of the input data is stored in _C1 . Note that the contents of _C1 are cleared after an AC key operation or verification operation.

Next, after the user has finished entering the number,
When the PIN key 2a is released, the key discriminator 20 no longer outputs an output signal to the line a, and the process advances to step _T6 .

In step _T6 , it is determined whether the content of _C1 , that is, the number of digits of the input data has reached "3". This happens when the user makes a mistake while entering the PIN number.
This is to prevent the user from inadvertently entering the verification operation by releasing the PIN key 2a, and the contents of _C1 are given to the comparison circuit 27 and compared with the constant "3" output from the control section 21. . And “C ₁ ≦
3", it is considered an input error and the process returns to step T _2.
After clearing the display once, input becomes possible again. If "C ₁ >3", the process advances to step T ₇ and verification is performed.

In step _T7 , area N of EEP-ROM15 is
After the encrypted password stored in (15b) is read out to the decoding section 24 and decoded, it is temporarily stored in the buffer 24a.
Then, the comparison circuit 26 compares the number stored in the A register and the password stored in the buffer 24a.

Now, assuming that they match, the step
Proceed to T ₈ , area M (15c) of EEP-ROM15
After is cleared, proceed to step _T9 .

In step _T9 , to display "OK",
A character code corresponding to “OK” is written from the control unit 21 to the X register via the bus line h,
Furthermore, display processing unit 2 displays the character code in the X register.
5, "OK" is displayed.

When this “OK” is displayed, the control unit 21
gives a start signal to the counter 28, drives the counter 28 until a carry signal is output (step _T10 ), and when a carry signal is output after 10 seconds,
The control unit 21 clears the character code written in the X register, thereby indicating "OK".
disappear (step T ₁₁ ).

For this reason, the "OK" display disappears after 10 seconds, making it virtually impossible to use it at the next store with the "OK" display still displayed, and it can only be used once per verification. This can prevent abuse.

On the other hand, if there is a mismatch in step _T7 , the process proceeds to step _T12 , where the contents of area M (15c) in the EEP-ROM 15 are transferred to B via bus line e.
written to the register.

Then, in step _T13 , the area M (1
Once the contents of 5c) are cleared, proceed to the next step.
At _T14 , the contents of the B register are incremented by "+1" by the arithmetic circuit 23. Thereafter, at step _T15 , the updated contents of the B register are written to area M (15c).

Next, at step _T16 , "ERROR" is displayed to clearly indicate that there was a mismatch at step _T7 . That is, a character code corresponding to "ERROR" is written from the control unit 21 to the X register via the bus line h, and this is sent to the display processing unit 25.
"ERROR" is displayed by supplying the signal to

Furthermore, in step _T17 , the contents of the B register updated in step _T14 are sent to the comparison circuit 27, and a comparison is made to see if the contents have reached "5".
The contents of the B register, that is, the number of mismatches is "5"
If the value has not been reached, the display will be cleared once using the AC key, and then the number can be set again (step
_T2 ).

However, if the content of the B register is "5" at step _T17 , the number of mismatches is "5", so the process proceeds to step _T18 , where the card is invalidated.

That is, the control unit 21 writes a flag ("1") to the _C0 digit of the C register, and writes a character code for displaying "EE...E" to the X register, indicating that the card is invalid. This will be clearly indicated by displaying "EE...E" and the card will no longer be usable.

Note that if the PIN key 2a is not pressed in step _T2 ,
If any other key is pressed, the process advances to step _T19 and performs calculations as a normal calculator.

[Second Embodiment of the Invention] In the first embodiment described above, the verification operation is automatically started by releasing the PIN key 2a, but as shown in FIG.
It is also possible to input a number while holding down the key 2a, and then press the CF key 2b after completing the input to enter the collation operation.

This embodiment can be easily realized by changing the configuration of the key discriminating section 20 shown in FIG. 3 to the key discriminating section 20' shown in FIG. 7. That is, the key discriminator 20' further
It is equipped with a detection circuit 20C that detects the press of the CF key 2b, and sends an output signal to the control unit 21 via line 1.
give to

FIG. 7 shows a key input section 10, a key discrimination section 20',
Only the control section 21 is shown, and other circuits are omitted because they are the same as in FIG. 3.

FIG. 8 shows the actions of the card user in the second embodiment, and step U ₁ and step U ₂ are newly added to the flowchart of FIG. 4.

That is, after clearing the display once with the AC key (step S ₁ ), enter the PIN while holding down the PIN key 2a (step S ₂ ), and when the number has been entered,
Release PIN key 2a (step _S3 ). Therefore,
The user checks the display (step U ₁ ), and if it is incorrect, clear it again using the AC key and enter it again; if it is entered correctly, press the CF key 2b to instruct the user to start the verification operation. (Step U ₂ ).

As a result of the verification, if the PIN number and the entered number match, "OK" is displayed (step S ₄ ), and if they do not match, it is determined whether the card is invalid or not. (Step S ₅ ).

Next, based on the flowchart in Figure 9, the second
The operation of the embodiment will be explained. In this flowchart, step _V1 is added in place of step _T4 and step _T6 in the flowchart of FIG. 5, and steps that overlap with the flowchart of FIG. 5 are omitted.

The operations from step _T1 to step _T3 are as described above, and their explanation will be omitted here. In Fig. 9, proceed from step T ₃ to step T ₅ , and press PIN key 2a.
It is determined whether or not is pressed.

Therefore, when the PIN key 2a is released, the step
Proceeding to _V1 , it is determined whether or not the CF key 2b has been pressed. In step _V1 , the detection circuit 20C of the key discrimination section 20' detects whether or not the CF key 2b has been pressed, and a detection signal is given to the control section 21 via line 1. If CF key 2b is not pressed, proceed to step _T2 and press CF key 2b.
If b is pressed, the process advances to step _T7 and the verification operation begins.

In this way, in the second embodiment, the verification operation does not begin until the CF key 2b is pressed after the password is input from the keyboard 2, so the input data can be fully confirmed, and if an incorrect input is made, the display is displayed. All you have to do is clear it and re-enter it, which prevents the card from being invalidated due to incorrect input when the card user uses it.

In the above embodiment, numerical values are used as the verification data, but the present invention is not limited to this, and alphanumeric characters, symbols, etc. may also be used.

〔Effect of the invention〕

As described in detail above, according to the present invention, verification data (PIN) is entered from the keyboard while holding down the PIN key (first verification key), so there is no chance of accidentally entering data while carrying the device. It is possible to prevent numbers from being entered and automatically verified, and also to determine whether the number of digits in the input data has reached a predetermined value, and to check whether the number of digits in the input data exceeds a predetermined value. This prevents the card user from accidentally entering the verification process even if he or she releases the PIN key while entering the number. This will prevent your card from becoming invalid due to input errors.

Furthermore, in addition to the PIN key (first verification key),
A CF key (second verification key) is provided, and by pressing the PIN key and entering the PIN number, and then pressing the CF key, the verification operation begins. You can avoid making mistakes when entering your PIN.

[Brief explanation of the drawing]

1 is an external perspective view of an identification card body according to a first embodiment of the present invention, FIG. 2 is a circuit block diagram of the same example, and FIG. 3 is a block diagram functionally representing FIG. 2. FIG. 4 is a flowchart for explaining the operation of the card user in the same example, FIG. 5 is a flowchart for explaining the operation of the same example,
Fig. 6 is an external perspective view of the identification card body according to the second embodiment, Fig. 7 is a block diagram of the key discrimination section and its surroundings in the same embodiment, and Fig. 8 is a diagram of the card user in the same embodiment. Flowchart for explaining the operation. FIG. 9 is a flowchart for explaining the operation of the same example. 1...Identification card body, 2...Keyboard, 2
a...PIN key, 2b...CF key, 3...Liquid crystal display device, 10...key input section, 11...
CPU, 13...ROM, 14...RAM, 15...
...EEP-ROM, 17...LSI, 20,20'...
Key discriminator, 20a...batshua, 20b, 20
c...Detection circuit, 22...Storage unit, 23...Arithmetic circuit, 26, 27...Comparison circuit, 27...Counter.

Claims (1)

[Scope of Claims] 1. In an identification card in which at least an integrated circuit is built-in, a plurality of keys for inputting data to be verified and a first key for issuing a verification instruction.
a key input means having a verification key; a first storage means for temporarily storing data input from the key input means; a second storage means for storing predetermined verification data; a comparison means for comparing and collating the contents of the second storage means;
a detection means for detecting whether or not the first verification key is pressed; and when the detection means detects that the first verification key is pressed, data input from the key input means; is written in the first storage means, and when it is detected that the first collation key is released, the contents of the first and second storage means are compared by the comparison means. A verification card characterized by comprising means. 2. Key input means having at least a plurality of keys for inputting data to be verified, and first and second verification keys related to verification instructions, in an identification card having a built-in integrated circuit; a first one for temporarily storing data input from the key input means;
a second storage means for storing predetermined verification data; a comparison means for comparing and verifying the contents of the first and second storage means; and the first and second verification data. a detection means for detecting whether or not each key is pressed; and when the detection means detects that only the first collation key is pressed, data input from the key input means; is written in the first storage means, and when it is detected that the first collation key is released and the second collation key is pressed, the contents of the first and second storage means are written to the comparison means. A verification card characterized by comprising a control means for controlling the comparison to be performed.