JPS5921423B2 - Unlocking equipment using a card - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a card-based unlocking system, particularly a card-based unlocking system that is suitable for use in hotels where there are many rooms that need to be locked and the person unlocking the locks changes frequently. Regarding the unlocking equipment used.

The hotel has many rooms that need to be locked.

The door of each room is usually equipped with a mechanical lock, such as a tumbler lock, which can be opened and closed with a key.

With a lock that opens and closes with a key, you have to hand over the key to use the room and pick it up after use, which requires a lot of effort to manage the keys.

Furthermore, if the key is lost, the lock itself needs to be replaced as a crime prevention measure against those who find it, which takes time and money.

Therefore, we installed an automatic unlocking device that unlocks the lock using an electrical signal, and installed a card reader, a storage device that stores a secret number, and a processing unit on the door, and locked the door using a card with the secret number recorded on it. Something has been devised to unlock it.

This device compares the secret number read from the card by the card reader with the secret number stored in the storage device, and unlocks when the two numbers match.

Then, each time the user of the same room changes, a code containing a new secret number is handed to the user.

The secret number is changed in a central control unit that centrally controls a large number of rooms, and the new secret number that has been changed is transmitted each time from the central control unit to the storage device of the corresponding room.

Therefore, with this method, communication cables must be installed between the central control unit and the lock/unlock devices in all rooms, which increases equipment costs and requires maintenance and inspection at appropriate intervals. Must be.

Therefore, there is a need for an unlocking facility using a card that does not require communication cables between the central control unit and the locking/unlocking devices in each room.

This invention was made in view of the above circumstances, and the secret number can be changed every time the user changes, so there is no need to take special security measures against loss or abandonment of the card. Furthermore, the present invention provides an unlocking facility using a card that does not require the installation of a cable between the present invention and the central control device and can be installed at low cost.

Hereinafter, a case where the present invention is applied to a hotel will be described with reference to the drawings.

1 to 3 show an overview of the process from issuing a card to unlocking a door using this card.

A card issuing machine 1 is installed at the front desk of a hotel.

When a card 2 having a magnetic stripe 3 is inserted into the card issuing machine 1, required card data is magnetically recorded on the magnetic stripe 3 according to a procedure described later.

This card data includes hotel code H1 room number N
, a secret number G, two types of auxiliary numbers A and B, and a designation code C for selecting the auxiliary number.

In Figure 2, these numbers or codes G, A, B
, C is appended with a suffix 2 indicating the number of times the card is issued to the same unlocking device.

When the card 2 is issued, this card 2 is handed over to the user who uses the corresponding room.

The door 4 of each room is provided with an unlocking device, and this unlocking device includes a card reader 5.

A card reader 5 is mounted on the outside of the door 4.

A fixed knob 6 is also provided on the outside of the door 4, and a room number N is displayed at the top.

The card reader 5 is of a manual scanning type, and when the user inserts the card 2 into the card reader 5 and scans it,
40 doors are unlocked.

Of course, an automatic scanning type card reader can also be used.

FIG. 4 shows the appearance of the lock device provided in each room of the hotel.

This locking device has an automatic locking function, and when the door 4 is closed, the trigger bolt 8 is activated, the latch 7 is fixed, and the door is automatically locked.

When the card 2 is inserted into the card reader 5 as described above, the unlocking solenoid 57 (FIG. 7), which will be described later, is energized.
And the indicator light 12 lights up.

Then, when the button 9 of the knob 6 is pressed, the latch is released and unlocked.

This locking device is equipped with an auxiliary mechanism for unlocking by mechanical operation using a key, and the key is unlocked by inserting the key into the keyhole 11 and turning it.

Further, an inner handle (path shown) is provided on the inner side of the door 4, and the door can be unlocked freely using this handle.

FIG. 5 shows the internal configuration of the card issuing machine 1. As shown in FIG.

The card issuing machine 1 includes a numeric keypad 24, a random number generator 25, an encoder 26, an arithmetic circuit 20, and arithmetic registers 21 and 22 (referred to as Ral for convenience).

(represented by Ra2) and a flag 23 for storing the specified code C.
(represented by Fl) and a group of registers 3 for storing various data.
0 and a RAM 40 for data storage.

Random number generator 25 includes an oscillator 27 and a counter 28.

The register group 30 includes six registers 31 to 36 that respectively store six types of card data.

Further, the RAM 40 is provided with two storage areas for each room, and a secret number G and a designation code C are respectively stored in these storage areas.

Now, add a subscript 1 to the secret number G, auxiliary numbers A, B, and designation code C of the card issued last time for a certain room, and represent them as Gl, AI, B1°C1, respectively, and this time for the same room. The suffix 2 is added to the secret number G, auxiliary numbers A, B, and designation code C of the issued card to give G2. A2゜B2. It is represented by C2.

The card issuing machine 1 creates the current secret number G2 from the previous secret number G1 and designation code C1, and either the current auxiliary number A2 or B2.

Here, the designation code C1 and the auxiliary number A2. B2 is a random number, and the random number generator 25 is also read out.

Auxiliary numbers A and B may be digit numbers, but 3, 4
Digits are preferred.

The code C1 was read out when the secret number G1 was created last time, and when the secret number G2 was created this time, the designation code C2 was read out for the next time (.

The designation code C takes a value of either 1 or O,
Auxiliary number A or B is selected depending on the value.

In this embodiment, when the designation code C is 1, the auxiliary number A is selected, and when the designation code C is 0, the auxiliary number B is selected.

There are many calculation methods to create this secret number G2.

For example, G2=G1+(A2 or B2)...
・(1) G2 2 G1x (A2 or B2)...
(2) G2=mXG1+nX(A2 or B2)-(3
)G2=(G1)2+(A2 or B2)...(4
), etc.

Here, m and n are constants, and the RAM of the card issuing machine 1
40 and a RAM 70 of the unlocking device 10, which will be described later.

In this way, the current secret number G2 is the previous secret number G
1 so that the required relationship exists between the two.

In this embodiment, equation (1) is used.

Let us take as an example the case where a card for room number N is issued.

RAM400 Storage area 47,4 for room number N
8 stores the previous secret number G1 and designation code C1.

Further, a hotel code H is stored in the register 31 in advance.

Referring to FIG. 6, when the hotel staff enters the room number N using the numeric keypad 24, the number is stored in the register 32 (step 101), and when the start button S is pressed (step 102), the random number generator 25 also The counted value of the counter 28 at the time is read out as the auxiliary number A2 and the register 3
5 (step 103).

Next, the previous designation code C1 is read from the storage area 48 of the RAM 40 and placed in the register Ra1 (step 10).
4), put 0 into register Ra2 (step 105)
By subtracting the contents of both registers Ral and Ra2 in the arithmetic circuit 20, it is determined whether the previous designation code C1 is 1 or 0, and this result is set in the flag F1 (step 106).

If the designation code C1 is 1, the subtraction result is 1, and at this time, the flag F1 is set to 0.

Conversely, if the designation code C1 is 0, the subtraction result is 0, and at this time, 1 is set in the flag F1.

As in the case of step 103, the random number generator 25 also reads out a random number and uses it as an auxiliary number B2 in the register 36.
(step 107).

Then, read the previous secret number G1 from the storage area 47 of the RAM 40 and set it in the register Ra1 (step 108), and check the state of the flag F1 (step 109).
.

If flag F1 is 0, register 35 may be auxiliary number A2
is read out and placed in register Ra2 (step 110),
If flag F1 is 1, auxiliary number B2 is sent from register 36.
is read out and put into register Ra2 (step 111),
The arithmetic circuit 20 adds the contents of both registers Ral and Ra2 and stores the result as the current secret number G2 in the register 33.
(step 112).

By the processing of steps 108 to 112, the specified code C1
It will be understood that the current secret number G2 is calculated by equation (1) using the auxiliary number A2 or B2 selected by and the previous secret number G1.

Since the last digit of the count value of the counter 28 of the random number generator 25 is 1 or O, read this and enter the current designation code C.
2 and stored in the register 34 (step 113).

Then, secret numbers G2 are obtained from registers 33 and 34, respectively.
and designation code C2 is read and stored in storage areas 47 and 48 of RAM 40 (steps 114 and 115).
.

As a result, the contents of storage areas 47 and 48 are changed to G1. C
I to G2 respectively. Changed to C2.

Finally, the hotel code H1, room number N, secret number G2, designation code 2, and auxiliary number A2 . B2 is read out, transferred to the encoder 26, and written to the card 2 (step 116).

FIG. 7 shows the unlocking device 10 provided on the door 4. As shown in FIG.

The unlocking device 10 includes a card reader 5, a timer 55,
A flip-flop 56 (represented by FF), an unlocking solenoid 5T, an arithmetic circuit 50, and an arithmetic register 51.
52 (represented by Rb1 and Rb2), a flag 53 (represented by F2) for storing various data, a register group 60 for storing various data, and a RAM 70 for storing data.

In this embodiment, the unlocked state is maintained for a certain period of time T after unlocking, and after this time T has elapsed, the locked state is returned again.

A timer 55 is used to measure this fixed time T.

The register group 60 also includes six registers 61 to 66.

The RAM 70 also stores an area 71 for storing the hotel code H, an area 72 for storing the room number N, an area 13 for storing the secret number G, an area 74 for storing the designation code C, and a set time T for the timer 55. A storage area 15 is provided.

The unlocking device 10 reads the data on the card 2 and stores the secret number G in the card data in the storage area 7 of the RAM 70.
The lock is released when there is any of the following relationships with the secret number G stored in 3.

The first case is when the secret number G read by the card reader 5 matches the secret number G in the storage area 73.

The other one is that the secret number G read by the card reader 5 is the secret number G in the storage area 73, the auxiliary numbers A and B in the card data, and the designated code C in the storage area 74.
This is a case where the relationship of equation (0) is established using .

That is, each number in the card data is converted to G2. A2. B
2. If the secret number and designated code of the storage areas 73°74 are respectively G1°C1, then these secret numbers Gl,
G2 is the auxiliary number A selected by the designation code C1
2 or B2 to release the lock if the relationship of equation (1) is satisfied.

In this case, since the user of the room numbered N has changed, the secret number G2 and designation code C2 in the card data are stored in storage areas γ3 and 14 of the RAM 70 in place of G 1 and CI, respectively.

It is assumed that the hotel code H1, the room number N, and the set time T of the timer 55 are stored in advance in the storage areas 7L72 and 75 of the RAM γ0, respectively.

Furthermore, the flip-flop 56 has been reset.

Referring to FIG. 8, when card 2 is inserted into card reader 5, card 2 is read and the read card data is read into register group 60 (step 120).

Then, the hotel code H in the storage area 71 of the RAM 70 is put into the register Rb1 (step 121), the hotel code H in the register 61 is put into the register Rb2 (step 122), and the hotel code is checked.

Both registers Rb1. If the content of Rb2 is subtracted and the result is O, flag F2 is set to 1, and if the subtraction result is other than 0, flag F2 is set to O (step 12
3).

Then, checking the state of the flag F2, if the flag F2 is 1, it means that the hotel code H in the card data is correct, and the next step is to check the Stella 11250 room number N.

If the flag F2 is O, it means that the hotel code H is incorrect and an unauthorized card is being used, so the process ends without unlocking.

In step 125, as in the case of checking the hotel code H, the room number N in the memory area γ2 of the RAM 70 is checked.
is placed in register Rbl, and then register 2620 room number N is placed in register Rb2 (step 126), and both registers Rb1. The contents of Rb2 are subtracted, and if the result is 0, flag F2 is set to 1 (step 12).
1).

Then, the state of the flag F2 is checked (step 128), and if the flag F2 is 1, it is assumed that the room number N is correct, and the process moves to step 129 to check the secret number G.

If the flag F2 is O, the process ends and the lock is not unlocked.

The registers 63 to 66 contain the current secret number G2, designation code C2, auxiliary number A2. B2 are respectively stored, and the previous secret number G1 and designation code C1 are stored in the storage areas 73 and 74 of the RAM 70.

In step 129, the secret number G (G1) stored in the storage area 73 is read out and placed in the register Rb1, then the secret number G2 of the register 63 is placed in the register Rb2 (step 130), and both registers Rb1. The contents of Rb2 are subtracted, and if the subtraction result is O, flag F2 is set to 1 (step 131).

If the subtraction result is not 0, flag F2 is set to O.

Then, checking the state of flag F2 (step 132), l
If so, proceed to step 133; if 0, proceed to step 1
Move on to 38.

Since the secret number of area 13 of RAM 70 is G1 and the secret number of register 63 is G2, these secret numbers do not match, and the answer at step 132 is NO.

This is a case where the user of room number N changes and a new card is used.

Therefore, next both numbers G1. Check whether G2 is related by equation (1).

In step 138, the designation code C1 stored in area T4 of the RAM 70 is read out and placed in register Rb1, and then O is placed in register Rb2 (step 139).
), the contents of both registers Rbl and Rb2 are subtracted, and if the result is O, flag F2 is set to 1, and if the subtraction result is 1, flag F2 is set to 0 (step 14
0).

Then, check the state of flag F2 and if it is O, the auxiliary number A
Proceed to step 142 to select 2; if 1, proceed to step 144 to select auxiliary number B2 (
Step 141).

In any case, first, Elijah 73's secret number G1
into register Rbl (steps 142, 144),
If flag F2 is 00, auxiliary number A2 of register 65
is placed in register Rb2 (step 143), and flag F
If 2 is 1, the auxiliary number B2 of the register 66 is put into the register Rb2 (step 145).

Then, the secret number G1 of register Rb1 and the register R
b2 and auxiliary number A2 or B2 are added and the result is placed in register Rbl (step 146).

Register 63 also reads secret number G2 and registers Rb.
2 (step 147), and both registers Rbl and Rb
If the result is 0, flag F2 is set to 1, and if the result is 0, flag F2 is set to 0 (step 148).

The content of register Rb1 is the sum of secret number G1 and auxiliary number A2 or B2, and the content of register Rb2 is secret number G2. Therefore, the above subtraction result is 0, which means that the above secret numbers G1 and G2 This means that the equation (1) is satisfied.

Therefore, in this case, the process proceeds to unlocking.

If the subtraction result in step 148 is O, both secret numbers G
l and G2 do not have the relationship shown in equation (1).

Therefore, if flag F2 is 00 (step 149
) Finish the process without unlocking.

In this way, if the secret number stored in the RAM 70 and the secret number recorded on the card do not have a certain relationship (for example, equation (1)), the lock cannot be unlocked.

If the flag F2 is 1 in step 149, the current secret number G2 stored in the register 63 is stored in the RAM 70.
Write the secret number in area 73 of (Step 1)
50).

Furthermore, the designation code C2 of the register 64 is written into the storage area 14 of the RAM 70 to update the designation code and prepare for the next issued card (step 151).

After the above processing, the set time T stored in area T5 of the RAM 70 is read out and set in the timer 55 (step 133), and the flip-flop FF is set (step 134).

When the flip-flop FF is set, the solenoid 57
works, so it is unlocked.

The timer 55(7) is counted until the content of the timer 55 becomes 0 (step 135), and when the content of the timer 55 becomes 0 (step 136), the flip-flop FF' is reset (step 135). 13T).

In this way, the door is unlocked only for a certain period of time T during which the flip-flop FF is set.

Note that the time measurement process in step 135 is performed by register Rbl.

Subtraction processing may be performed using Rb2.

Since the secret number in area T3 of the RAM 70 has been updated from G1 to G2 in step 150, when attempting to unlock the door again using the same card, the contents of the register 63 and the contents of the storage area 73 will match (step 132). (Yes)

In this case, the process proceeds to step 133, where the flip-flop FF is set as described above and unlocked for a certain period of time T.

In steps 142 to 148, the auxiliary number A2 or B2 is added to the previous secret number G1 to check whether the addition result matches the current secret number G2.
It is also possible to subtract the auxiliary number A2 or B2 from 2 and check whether the subtraction result matches the previous secret number G1.

An example of this procedure is shown in FIG.

Regardless of the state of flag F2 in step 141, the current secret number G2 is transferred from register 63 to register Rb.
l (steps 152 and 154), then flag F2
The auxiliary number A2 or B2 is stored in the register 65 depending on the state of the
or from 66 to register Rb2 (step 15
3 or 155).

Both registers Rb1. The contents of Rb2 are subtracted and the result is stored in register Rb1 (step 156).
).

The contents G1 of area 73 of RAM 70 are put into register Rb2 (step 157), and both registers Rb1. Subtract the contents of Rb2 and set flag F2 to 1 according to the result of this subtraction.
or set to O (step 158).

Unlock all or some of the rooms in a hotel (instead of a master key, a card can also have the same function as the master key).

If such a card is called a master card, the unlocking device 10 described above can be applied to the master card as well.

The Master Card has a Master Card on the magnetic stripe.
Record the code identifying the card, secret number, designated code, and supplementary number.

On the other hand, a code indicating that it is a master card, a secret number, and a previous designation code are stored in a predetermined storage area of the RAM 70.

Then, the card data of the Master Card is read by the card reader 5, and the code indicating that it is a Master Card matches. If the codes match, the secret number of the card and the secret number of the RAM 70 are See the match.

If both secret numbers match, the lock will be released (.

If you lose your MasterCard or need to change your MasterCard's secret number, use the previous secret number and designated code to create a secret number and auxiliary number that satisfy the relationship in equation (1). Issue recorded master cards.

When unlocking using this new master card, the same process as steps 138 to 151 is performed to ensure that the previous and current secret numbers are the same, provided that the codes that indicate the master card match. It is checked whether there is a relationship, and if there is a predetermined relationship, the secret number and designated code in the RAM 70 are updated.

In this way, once the secret number has been updated, it can only be unlocked with the new master card, and cannot be unlocked with the previous master card.

Such a Master Card would be suitable for use by hotel maids, maid supervisors, managers, etc.

The unlocking device 10 shown in FIG. 7 is constructed using a central processing unit, particularly a microprocessor, but the unlocking device can also be constructed by combining various logic circuits as shown in FIG. 10.

FIG. 11 shows the output signals of each circuit in the unlocking device 15 shown in FIG. 10, and FIG. 11a shows the operation in a steady state in which the secret number etc.
The figures each show the operation when updating a secret number, etc.

In FIG. 10, a card reader 5, a register group 60
, the first memory 70, and the solenoid 57 are given the same reference numerals as the card reader, register group, RAM, and solenoid shown in FIG. 7 for convenience.

It is assumed that the second memory T6 stores in advance the secret number G1 or G2 that was also read from the card 2 in the previous unlocking operation.

Furthermore, the flip-flop 79 is reset in advance.

The card 2 was also read by the card reader 5: hotel code H1 room number N5 secret number G2, designation code C2 and auxiliary number A2. B2 is set in each register 61 to 66 of the register group 60, respectively.

The first memory 70 stores in advance the hotel code H5, room number N, secret number G1゜(G2) and designation code CL.
(C2) is stored.

The registers 61 and 62 and the hotel code H and room number N in the first memory 70 are compared in the comparator circuit 54A, and if they match, a match signal a is output.

Since this coincidence signal a is sent to the differentiating circuit 88, the gate 89 is opened by the output of this circuit 88, and the secret number G stored in the second memory 76 is sent to the area 73 of the first memory TO.

Then, the secret number G of the register 63 and the area 73 are compared by the comparator circuit 54B, and if they match, a match signal is output.

Both coincidence signals a and b are sent to the AND circuit 59, and this circuit 59 generates an output, so that the monostable multivibrator 58 generates an output for a certain period of time (corresponding to the set time T of the timer 55), and the solenoid 57 is activated. It is energized and unlocked for the specified period of time.

When the output of the multivibrator 58 falls after a certain period of time has elapsed, the output of the NOT circuit 99 rises, which is detected by the differentiating circuit 100 and becomes the reset signal R.

This reset signal R resets the register group 60 and erases its contents, and also resets the flip-flop 79.

Hotel code H1 in register group 60 and first memory 70
If the room number N or the secret number G does not match, the match signal a or b is too small (one of them is not output, so the lock will not be unlocked).If the hotel code H and the room number N match However, if the secret numbers G do not match and therefore no match signal is output, the NOT circuit 85 outputs a signal, and the AND circuit 80 also outputs a signal C.

This signal C is sent to AND circuits 81 and 82 and also to flip-flop T9, so that flip-flop 79 is set.

The signal d is the designation code C stored in the first memory 70.
It is raining the condition of 1.

If the designation code C1 is 1, the signal d is output, and the AND
Since an output is generated from the circuit 81, this is detected by the differentiating circuit 92.

Then, the signal e is output from the differentiating circuit 92 and the gate 94
is opened, auxiliary number A2 is selected and this number A2 is sent to addition circuit 78.

When the designation code C1 is O, the signal d is not output, and as a result, an output is generated from the NOT circuit 86, so the AND
An output is generated from circuit 82.

The output of the AND circuit 82 is detected by the differentiating circuit 93, and since the gate 95 is opened by the output signal g of the differentiating circuit 93, the auxiliary number B2 is sent to the adding circuit 78.

In the addition circuit 78, the secret number G1 stored in the area 73 of the first memory γ0 is added to the auxiliary number A2 or B2 selected by the designation code C1, and the addition result is stored in the storage circuit 7γ. .

Since the output of the AND circuit 81 or 82 is sent to the timer 84 via the OR circuit 83, an output f is generated from the timer 84 after a certain period of time and is detected by the differentiating circuit 90.

The gate 91 is opened by the output of the differentiating circuit 90, and the addition result of the adding circuit 78 is stored in the first memory 70 in the storage circuit 7γ.
It is stored in area 73 of.

If the secret number G2 in the register 63 matches the above addition result stored in the area T3 of the first memory 70, a match signal is output from the comparison circuit 54B.

Since the flip-flop 79 has already been set by the signal C, the output of the coincidence signal S generates an output from the AND circuit 87, which is detected by the differentiating circuit 98.
Signal E is output.

This signal E opens gates 96 and 97, and the secret number G2 of the register 63 is stored in the second memory T6.
40 designation codes C2 are respectively stored in area 74 of memory 70.

On the other hand, as described above, an output is generated from the multivibrator 58 in response to the coincidence signal S, and the lock is released for a certain period of time, and the reset signal R is output after a certain period of time after the unlocking.

In this way, the secret number G2 read from the card 2 and the secret number G1 stored in the memory 70 are
), the lock is released and the secret number G2 and designation code C2 read from the card 2 are newly stored in the memory 70'.

It goes without saying that the card issuing machine 1 can also be configured by a combination of logic circuits in the same way.

In the above embodiment, the secret number G2 of the register 63 is sent to and stored in the second memory 76 by the signal E.
Memory value of addition result by addition circuit T8 (storage circuit 77)
Alternatively, the value stored in area 73 of first memory 70 may be sent to second memory 76 for storage.

In the above example, there are two auxiliary numbers, A and B, but 3
It is also possible to prepare one or more auxiliary numbers and designate one or more of these auxiliary numbers with the designation code C.

Therefore, in this case, the designation code C takes a value of 3 or more instead of a binary value of O or 1.

Also, when the card issuing machine 1 creates the current secret number G2, the unlocking devices 10 and 15 check whether the previous secret number G1 and the current secret number G2 have the relationship shown in equation (0). During the inspection, the previous designation code C1 is used to select one of the auxiliary numbers A2 and B2, but it goes without saying that the current designation code C2 may also be used.

As described above, in the unlocking device according to the present invention, the card issuing machine uses the previous secret number and the auxiliary number selected by the specified code from among the plurality of auxiliary numbers to establish a certain relationship with the previous secret number. Create this secret number,
This secret number, multiple auxiliary numbers, and designated codes are recorded on the card.

Then, the unlocking device reads the data recorded on the card and checks whether the read secret number matches the secret number stored in the recording device and whether they have the above-mentioned certain relationship. The card is unlocked when the secret number of the card and the secret number of the storage device match and the above-mentioned certain relationship exists, and the secret number of the card and the secret number of the storage device are in the above-mentioned certain relationship. In some cases, the secret number of the card is stored in a storage device and the secret number is updated.

Therefore, the secret number of the card can be changed every time the user changes, and once the secret number is updated, it can no longer be unlocked using the previous card.
There is no need to take special security measures for cards used before the last time.

Then, the card issuing machine creates the current secret number so that it has a certain relationship with the previous secret number, and the unlocking device uses the stored previous secret number to make the current secret number the same as above. Therefore, it is possible to determine whether the secret number of the card is legitimate without transmitting the changed secret number from the central control device to the unlocking device.

Therefore, there is no need to connect the central control device and each unlocking device with a cable, and the device can be installed at a very low cost.

Furthermore, since multiple auxiliary numbers are prepared and selected using designated codes, the above-mentioned certain relationship is extremely difficult to understand, and the secret number is also recorded on the card.
It is extremely effective as a crime prevention measure.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory diagrams showing an overview of the process from issuing a card to unlocking the door with this card, Figure 4 is a perspective view showing the appearance of the locking device and unlocking device on the door, and Figure 5 is FIG. 6 is a block diagram showing the internal configuration of the card issuing machine, FIG. 6 is a flow chart showing the operation of the card issuing machine, FIG. 7 is a block diagram showing the internal configuration of the unlocking device, and FIG. 8 is the operation of the unlocking device. 9 is a flow chart showing a modification of the same operation, FIG. 10 is a block diagram showing another example of the unlocking device, and FIG. 11 is a flow chart showing a modification of the unlocking device shown in FIG. 10. 5 is a time chart showing output signals of each component circuit. 1...Card issuing machine, 2...Card,
5...Card reader, io, is...
・Unlocking device, 25...Random number generator, 40,70
...RAM, 20, 50... Arithmetic circuit, 78... Addition circuit.

Claims (1)

[Scope of Claims] 1. A card issuing machine that issues a card with predetermined data recorded thereon, and an unlocking device that reads the data on the card, performs a predetermined inspection, and unlocks the card. comprises a plurality of auxiliary numbers and a random number generator that generates a designation code for selecting at least one of the plurality of auxiliary numbers, a storage device that stores at least a secret number, and a previous number stored in the storage device. comprising an arithmetic device that creates a current secret number having a certain relationship with the previous secret number using the secret number and an auxiliary number selected by a specified code from among the plurality of auxiliary numbers obtained from the random number generator, The created current secret number is stored in the storage device, the secret number is updated, and the created current secret number, a plurality of auxiliary numbers, and a designated code are stored in the card, and the unlocking device is configured to: a card reader that reads data stored on the card; a storage device that stores at least a secret number; and a card reader that determines whether or not the secret number read from the card matches the secret number stored in the storage device; It is equipped with an arithmetic device that checks whether there is a relationship, and unlocks the card when the secret number of the card and the secret number of the storage device match and when the above-described certain relationship exists, and the secret number of the card and the above-mentioned secret number are unlocked. An unlocking device using a card, which stores the secret number of the card in the storage device and updates the secret number when the secret number of the card and the secret number of the storage device have the above-described certain relationship. 2. Store the secret number and designated code in the storage device of the card issuing machine, and when creating the current secret number, select the auxiliary number based on the previous designated code stored in the storage device, and the card Unlocking equipment using a card according to claim 1, characterized by recording the current designation code generated by the random number generator, and storing the current designation code in the storage device to characterize the designation code. .