KR20040092852A - Digital doorlock using a key-code algorithm - Google Patents

Abstract

PURPOSE: A digital door lock using an intelligent encryption generation key is provided to improve the security by reading and authenticating an encryption key of a proximate card and generating a new encryption key. CONSTITUTION: A digital door lock using an intelligent encryption generation key includes a proximate card and a proximate card terminal. The proximate card is formed with a card memory and a transmitter. The digital door lock further includes an outer plate(410) for opening a door, a number input part for inputting numbers to unlock a door lock system, an antenna window for reading the proximate card, a sensor having a wake-up function, an outside lever(404), an internal plate(411), a battery cover installed at an upper end of the internal plate, a button for releasing a secret number, a button for performing an opening and a shutting function, a manual lever for controlling directly a motor, a button for preventing the opening of the door, and an inside lever(408).

Description

Digital door lock using intelligent password generation key {Digital doorlock using a key-code algorithm}

The present invention decrypts and authenticates the encryption key of the proximity card when the proximity card 204 is close to the proximity card terminal 401, and generates a new encryption key by using an encryption algorithm. It is developing a digital door lock, and by using a proximity card method, it provides more convenience for the user.

Fingerprint Recognition The digital door lock can duplicate the fingerprint by using the traces of the fingerprint left on the fingerprint sensor and cannot be used in case of fingerprint damage such as the elderly.

In a digital door lock by a contactless card, a general proximity card (125Khz) can be hacked with ID only by using a card reader terminal, and data stored in the card can be easily accessed. In addition, since the smart card method (13.56Mhz) uses the chip ID of the card, ID access is possible only by using a card reader terminal, and since an encryption algorithm is not applied and only a read function is used, an ID cannot be assigned.

The existing encryption scheme is composed as shown in FIG. 1 to focus on raising the encryption level, but the key itself is a fixed secret key. Therefore, when various methods of decryption were studied and a method of decrypting the algorithm came out, the secret key was naturally known.

Unlike the existing technology, the intelligent encryption key is used by changing the secret key to RANDOM every time by applying an irregular RANDOM secret key while using the existing encryption algorithm. Also, once the used key is discarded, even if the CRACKER copies the key, the CRACKER has to do the complicated work of decrypting the secret key once again, so it is impossible to decrypt the key.

By disabling the secret key decryption of the proximity card, it is possible to solve the problem of access key hacking of the existing digital door lock product.

1 is a table comparing a conventional encryption technique with the encryption technique of the present invention.

2 is an internal perspective view of a proximity card in accordance with one embodiment of the present invention.

3 is a detailed block diagram of a proximity card terminal according to an embodiment of the present invention.

Figure 4a is a left side view of the digital door lock according to an embodiment of the present invention.

4B is a front perspective view of the digital door lock according to the embodiment of the present invention.

Figure 4c is a rear view of the digital door lock according to an embodiment of the present invention.

4D is an example of installation of a magnet sensor according to an embodiment of the present invention.

4E is an enlarged perspective view of a magnet sensor according to an embodiment of the present invention.

5 is a structure of a sensor unit according to an embodiment of the present invention.

6 is a signal from a sensor unit according to an embodiment of the present invention.

7 is a structure of a memory map of a proximity card according to an embodiment of the present invention.

8 is a memory map structure of a proximity card terminal according to an embodiment of the present invention.

9 is a floor chart showing an intelligent algorithm according to an embodiment of the present invention.

10 is a floor chart of the keypad method to unlock the door with a password according to an embodiment of the present invention.

11 is a floor chart of a door unlocking method using a proximity card to which an encryption algorithm is applied according to an embodiment of the present invention.

12 is a flowchart illustrating a card registration algorithm when a proximity card is in proximity to a proximity card terminal according to an embodiment of the present invention.

13 is a flowchart illustrating a card operation algorithm when a proximity card is in proximity to a proximity card terminal according to an embodiment of the present invention.

14 is a floor chart showing an algorithm of a method for generating an encryption key according to an embodiment of the present invention.

{Description of symbols for main parts of the drawing}

201: coil (antenna) 202: semiconductor device

203: plastic molding 204: proximity card

401: proximity card terminal 402: antenna window

403: key pad portion 404: outer lever

405: dead bolt 406: latch bolt

407: Lock Driver 408: Inner Lever

409: Mortise Body 410: External plate

411: inner plate 412: battery cover

413: key pad cover 420: Sensor

431: open / close button 432: manual lever

433: door opening prevention button 434: registration, release button

507: controller unit 508: power unit

In order to achieve the above object, the digital door lock of the present invention includes a proximity card terminal 401 that opens and closes a door by transmitting encrypted data of the proximity card 204.

In the present invention, the proximity card has a transmitting unit 201 and a card memory unit 202 therein, and the card memory unit includes an encrypted key value 704 and a memory area 703.

In the present invention, the proximity card terminal 401 includes a signal processor for processing an access signal of the proximity card; An encryption processing unit for processing the key value and the ID value with an encryption generation algorithm; A terminal memory unit for storing the processed data; It includes a control unit for adjusting the release device by the data value.

In the present invention, the memory unit includes a card number value 801 assigned to each proximity card, a key value 802 generated by encryption by a predetermined algorithm, and an ID value 803.

In the present invention, the key value includes a public key and a private key derived using a predetermined method.

In the present invention, the proximity card terminal 401 includes a sensor 420 that detects the approach of the card and changes the power to the sleep mode or the activation mode according to the card access.

In the present invention, the digital door lock includes a magnet sensor for checking whether the door is opened or closed.

In the present invention, a method of registering a proximity card for opening and closing a digital door lock includes selecting only one card when approaching a plurality of cards (S1202); Transmitting an initial key value of the selected proximity card (S1203); Transmitting the access permission signal of the corresponding memory to the proximity card terminal in the proximity card receiving the key value (S1204); Generating an initial key value and an initial ID value in the proximity card terminal receiving the signal (S1205); Generating an encryption key by encrypting the generated initial key value and initial ID value (S1400); Classifying and storing the encrypted initial key value and initial ID value in a predetermined storage area (S1207); Transmitting the encrypted initial key value and ID value to the proximity card (S1208); Storing the key value and the ID value in a proximity card and a terminal (S1209); And transmitting the storage completion signal from the proximity card to the proximity card terminal (S1210) and checking the transmission signal and ending.

In the present invention, a method of opening and closing a door by a proximity card includes transmitting a card number from a proximity card to a proximity card terminal (S1302); Transmitting a key value corresponding to the transmitted card number to a proximity card (S1303); Activating a corresponding memory area by the transmitted key value (S1304); Transmitting an ID stored in the activated memory to a proximity card terminal (S1305); Deciphering the transmitted ID by a predetermined method (S1306), and comparing the determined ID to determine whether the door is opened or closed (S1307); After opening the door, generating a new key value in a predetermined manner (S1308) and generating an encryption key by encryption (S1400); Storing the newly encrypted key value and ID value (S1311); And transmitting the newly encrypted key value and ID value to a proximity card (S1312).

In the present invention, the method for generating an encryption key includes selecting a predetermined odd number that is not disclosed (S1401); Obtaining a common key by the selected number (S1402); Obtaining an Euler function with the selected number (S1403); Selecting the derived function and a prime factor (S1404); Obtaining a predetermined key by Euclid's method using the derived mutually significant numbers (S1405); And using the values derived in steps 1402 and 1404 as the public key and using the values derived in steps 1402 and 1405 as the private key (S1406.S1407).

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a schematic internal view of proximity card 204 in accordance with one embodiment of the present invention.

In the above embodiment, the proximity card 204 includes a coil 201 and a semiconductor element 202 therein.

Referring to FIG. 2, a coil 201 is surrounded inside and outside the proximity card 204, and both ends of the coil are connected by a semiconductor device 202.

The outside of the proximity card is molded in plastic (203), and the semiconductor element inside has a key value and an ID value to provide the unlock signal of the terminal.

Since the coil 201 surrounds the inside of the proximity card 204, the proximity card terminal 401 may receive data and recognize the proximity card 204 regardless of the proximity of the card in any direction.

3 is a detailed block diagram of a proximity card terminal according to an embodiment of the present invention.

In the above embodiment, the proximity card terminal 401 may include a controller 507, a lock driver 407, a mortise body 409, and an inner lever 408. , An outer lever 404, a keypad 403, a card reader 402, a power 508, and a sensor 420.

The above embodiment is a block diagram in which the proximity card terminal is divided into an inner side 311 and an outer side 310 based on the door.

Referring to FIG. 3, the outer portion 310 of the proximity card terminal includes a keypad 403, a card reader 402, an outer lever 404, and an inner portion of the controller 507 and a lock driver 407. ), A mortise body 409, a power supply 508, a sensor 420, the inner lever 408.

The keypad 403 and the card reader 402 are connected to the controller 507 inside the card terminal, and the outer lever 408 is connected to the mortise body 409.

The power source 508 and the sensor 420 are also connected to the controller 507 and the inner lever 408 is connected to the mortise body 409.

The mortise body 409 is connected to the lock driver 407 and to the controller 507.

The keypad 403 enables unlocking by number input and determines whether to open or close the input through a predetermined algorithm.

The power supply 508 and the sensor 420 are connected to the controller 507. The sensor 420 detects the proximity of the proximity card and minimizes the power consumption by changing the power to an activation mode when the proximity card is approached.

Hereinafter, a detailed process will be described in detail with reference to FIG. 4.

4A, 4B, and 4C are left side, front perspective, and rear views of a digital door lock according to an embodiment of the present invention.

In the above embodiment, the digital door lock includes an outer plate 410, a keypad 403, a proximity card terminal 401, an antenna window 402, a sensor 420, an inner plate 411, a dead bolt 405, The latch bolt 406, the battery cover 412, the registration release button 434, opening and closing button 431, manual lever 432, door opening prevention button 433, the inner lever 408.

The embodiment shows a state in which the proximity card reader is included outside the digital door lock.

Referring to FIG. 4, an outer plate 410 is formed at an outer side of the digital door lock to prevent an external shock, a keypad 403 is positioned at an upper side of the outer plate, and a keypad cover 413 protecting the keypad at an outer side of the keypad. ) Is formed, a proximity card terminal 401 is formed at the bottom, the antenna window 402 and the sensor 420 is provided on the outside of the card terminal and the outer lever 404 is formed at the bottom.

A motibody body 409 is formed at a part of the digital door lock positioned at the center of the door, and the mortise body 409 is provided with a dead bolt 405 and a latch bolt 406 to open and close the door. The lock driver 407 inside the digital door lock has a geared motor and a motor sensor for operating the motor to control the motor.

A portion of the digital door lock formed inside the door includes a battery cover 412 for preventing damage to a battery, which is a power source, and a registration and release button 434 for registering and releasing a card under the battery cover 412. In the lower part, the opening / closing button 431, the manual lever 432, and the door opening preventing button 433 are positioned, and the inner lever 408 is located at the lowermost side.

The user determines whether the door is opened or closed by key input or card proximity. If you want to open the door by key input, enter the password of the door to open the door, if you want to open by card proximity sensor 420 near the antenna window 402, the sensor 420 It senses its position in close proximity and makes the outer lever 404 rotatable. The operation of the sensor will be described in detail with the following drawings.

As the outer lever 404 is rotated while the proximity card 204 is close to the proximity card terminal 401, the dead bolt 405 and the latch bolt 406 are released from the door frame, and the mortise body ( The door 409 is unlocked by allowing the dead bolt 405 and the latch bolt 406 to move in the horizontal direction and rotating the lever by the operation of the lock driver 407.

4D is an example of installation of a magnet sensor according to an embodiment of the present invention.

The present invention may include a magnet sensor. The magnet sensor can check whether the door is opened or closed, it may be used to ring the emergency bell when the door is forcibly opened by the outside or to automatically lock when the door is closed.

4E is an enlarged perspective view of a magnet sensor according to an embodiment of the present invention.

The magnet detector is a pair of two to check whether the door is opened or closed.

5 is a diagram illustrating an operation when a proximity card approaches a sensor.

In the above embodiment, the sensor includes an emitter 503, a receiver 504, a pulse oscillator 501, an emitter driver 502, a filter and an amplifier circuit. (Filter & Op-Amp) 505 and a signal processor 506.

Referring to FIG. 5, the sensor 420 generates a pulse signal for a predetermined time in order to minimize power consumption in the pulse oscillation circuit 501. According to the generated pulse signal, the light emitting unit driving circuit 502 generates the light emitting unit driving signal.

In response to the generated light emitting unit driving signal, the light emitting unit 503 emits infrared rays. When the proximity card 204 approaches, the infrared signal generated by the light emitting unit 503 is reflected on the card to receive the light receiving unit 504. To be detected by.

The sensed signal is filtered and amplified by the filter and amplification circuit 505, and the filtered and amplified signal is converted into a logic signal while passing through the signal processing circuit 506. The signal processing circuit notifies the presence of a card and performs a function of informing the controller 507 such that the card is in a reception state.

The moment the signal is applied to the controller in the signal processing circuit, the controller applies power 508 to the card reader.

6 is a signal from a sensor unit according to an embodiment of the present invention.

Q1 is a signal generated from the pulse oscillation circuit. The Q1 signal generates pulse waves at regular time intervals. Although the pulse generation period is not fixed, it is desirable to make the pulse generation period longer than the pulse generation time in accordance with the purpose of the sensor. In the present invention, a pulse wave having a main period of 300 ms is applied to the emitter constantly for 10 ms.

Q2 is the signal when the card approaches. If the card is close, a signal is generated and disappears when it is far away.

Q3 is a pulse wave signal of a portion where the card access signal is generated by the light receiving unit. At the time when Q1 and Q2 coincide, the light receiving unit generates a weak pulse signal.

Q4 is a signal obtained by amplifying the weak signal of Q3 by filtering and amplifier.

Q5 is the process of generating the logic signals of '0' and '1' to check the proximity of the card after the pulse signal which has been operated by Q4.

7 and 8 are memory map structures of a proximity card and a terminal according to an embodiment of the present invention.

In the above embodiment, the card memory map structure includes a card number, a key value 704, and a memory area 703, and the terminal memory map structure includes a card number 801, a key value 802, and an ID code 803. Has

7 and 8, the memory for one card is composed of a key value and a memory area having a capacity of 48 bits, and the key value 704 and the memory 703 use a part of the memory area of the card. .

The key value 704 stores a key value 704 allowing access to the memory area 703 and the key value 704 is sent only from the terminal and not from the card, and access is allowed to the memory area 703. Even though the key values are all displayed as '0', they cannot be read. In addition, the key value 704 has an instruction group code of 1 byte and an ID code of 128 bytes.

9 is a floor chart showing an intelligent algorithm according to an embodiment of the present invention.

The floor chart includes determining a cipher text (S901), analyzing data (S903), determining a suitability (S904), and determining a cipher text (S906).

Referring to FIG. 9, when a new cipher text is read (S901), the data is analyzed through Range Sector data (S902 and S903), and the suitability thereof is determined (S904). In case of conformity, the ciphertext is confirmed (S906) and terminated.

The range sector is a memory area of an encryption code that stores a data value determined in a statistical manner, using a probability of distribution and covariance.

According to the above block diagram, hacking can be prevented by removing the uniformity of the data distribution and removing the regularity.

10 is a floor chart showing a keypad method for unlocking a door with a password according to an embodiment of the present invention.

Referring to FIG. 10, first, the keypad case is opened (S1001), a password is input (S1002), and the keypad cover button is pressed (S1003). Thereafter, the terminal determines whether the pressed password matches the registered password (S1004). If the values match, a "OK Melody" tone sounds and the "OK LED" turns on, and the door is opened. (S1005)

If the registered password and its value do not match, "Error Melody" sounds and "Alarm LED" flashes for 2 seconds. (S1006)

11 is a floor chart of a door unlocking method using a proximity card to which an encryption algorithm is applied according to an embodiment of the present invention.

When the proximity card enters a certain area when the terminal approaches the terminal (S1101), the terminal recognizes the card and wakes up (S1102) and determines whether the card is a registered card (S1103). If the card is a registration card, it will sound "OK Melody" and the door will open with the "OK LED" on (S1104). If it is not a registered card, it will sound "Error Melody" and the "Alarm LED" will flash for 2 seconds (S1105). .

12 is a floor chart illustrating a card registration algorithm when a proximity card approaches a terminal according to an embodiment of the present invention.

Referring to FIG. 12, first, when the proximity card approaches the antenna area (S1201), the terminal performs anticollision (S1202). The anticollision is an algorithm that selects and executes only one card among several cards when several cards approach the terminal.

After performing the anticollision, the initial key value of the selected card is transmitted to the card (S1203), and the card receiving the initial key value transmits a memory access permission signal to the terminal (S1204).

The terminal receiving the memory access permission signal from the card generates an initial ID and generates an initial key value using a random equation (S1205), and encrypts the initial ID value using the initial key value to classify and store it in a range sector. In operation S1207, the range sector is a memory area of an encryption code that stores a data value determined in a statistical manner, using a probability of distribution and covariance.

The proximity card terminal transmits the initial key value and ID value encrypted by the card to the card and stores the values in the proximity card and the proximity card terminal. (S1208, S1209)

The card transmits a storage completion signal to the terminal (S1210) and the terminal ends after checking it.

Fig. 13 is a flowchart illustrating a card operation algorithm when a proximity card according to the present invention is approached to a proximity card terminal.

Referring to FIG. 13, when the proximity card approaches the antenna area (S1301), the card number is transmitted from the card to the terminal (S1202), and the terminal transmits the key value of the corresponding card to the card (S1303). Activate the corresponding memory area (S1304).

After the proximity card activates the memory area corresponding to the key value, the encrypted ID is transmitted to the terminal (S1305). The proximity card terminal decrypts the transmitted ID value (S1306), compares and determines the door, and then opens and closes the door. It is determined whether or not (S1307).

The proximity card terminal newly generates a key value by a predetermined method (S1308) and newly encrypts an ID value by using the new key value (S1400).

After that, the newly encrypted ID is classified and stored in the Range Sector (S1311), the key value is transmitted to the card, and the new encrypted ID value is transmitted (S1312).

14 is a flowchart illustrating an encryption key generation algorithm as an embodiment according to the present invention.

Referring to FIG. 14, the ciphertext of the encryption process is C = P ^e mod n, where C is a ciphertext, P is a plain text, e is a public key, and n is a common key.

The ciphertext of the decryption process is P = C ^d mod n, P is plaintext, C is ciphertext, d is private key and n is common key.

First, select an undisclosed odd number p and q (S1401), and obtain the common key "n" by multiplying p and q (S1402) using the Euler function ρ (n) = (p-1) (q-1) To obtain ρ (n) (S1403).

Arbitrary odd numbers p and q shown in the drawing are not equal to each other and should be almost the same number of digits, and (p-1) and (q-1) should have large prime factors, respectively, (p-1) and (q-1). The greatest common divisor of) should be a small number (S1404).

ρ (n) and the number e that are mutually different are selected, and d is obtained using Euclid's method (S1405). n and e are used as public keys (S1406), and n and d are used as private keys (S1407).

<Example 1>

Select p = 7, q = 11 to get the common key n = 7 x 11 = 77, and use the formula ρ (n) = (p-1) (q-1) ρ (n) = (7- 1) Find x (11-1) = 60. In addition, e = 37 is selected so as to be different from 60, and d = 13 satisfying 37 xd = 1 mod 60 is obtained from exd = 1 mod ρ (n) using Euclid method to reveal n = 77 and d = 37. do.

It is a secure digital door lock with a security algorithm that consists of a proximity card for read / write and a terminal that is a proximity recognition device.The door can be unlocked and entered as the proximity card with chip and coil is close to the terminal. Equipped with a number input unit on the top of the external plate, it is easy to unlock the door even if the card is lost.The ID that changes randomly is changed every time, not a fixed value. If you delete it, you can't use the lost card anymore and the rules are so random that developers can't find it.

Therefore, the security can be more easily applied to a wide range of applications, such as access control system, wireless remote control, digital safe, etc. in addition to the above embodiment.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

Claims (10)

In the digital door lock which can be opened and closed by a proximity card, Digital door lock, characterized in that it comprises a proximity card terminal 401 for opening and closing the door by the transmission of the encrypted data of the proximity card (204). In the proximity card that enables the opening and closing of the digital door lock, The proximity card 204 has a transmission unit 201 and a card memory unit 202, and the card memory unit includes an encrypted key value 704 and a memory area 703. Characterized by proximity card 204. The method of claim 1, wherein the proximity card terminal 401 is A signal processor for processing an access signal of the proximity card; An encryption processing unit for processing the key value and the ID value with an encryption generation algorithm; A terminal memory unit for storing the processed data; And a control unit for adjusting the unlocking device according to the data value. The method of claim 3, wherein the memory unit, And a card number value (801) assigned to each proximity card, a key value (802) generated by encryption by a predetermined algorithm, and an ID value (803). The method of claim 4, wherein the key value is, A digital door lock comprising a public key and a private key derived using a predetermined method. The digital door lock according to claim 1, wherein the proximity card terminal (401) includes a sensor (420) for detecting the proximity of the card and changing the power to a sleep mode or an active mode according to the card access. The digital door lock of claim 1, wherein the digital door lock includes a magnet sensor for checking whether the door is opened or closed. In the method of registering a proximity card for opening and closing the digital door lock, Selecting only one card when approaching a plurality of cards (S1202); Transmitting an initial key value of the selected proximity card (S1203); Transmitting the access permission signal of the corresponding memory to the proximity card terminal in the proximity card receiving the key value (S1204); Generating an initial key value and an initial ID value in the proximity card terminal receiving the signal (S1205); Generating an encryption key by encrypting the generated initial key value and initial ID value (S1400); Classifying and storing the encrypted initial key value and initial ID value in a predetermined storage area (S1207); Transmitting the encrypted initial key value and ID value to the proximity card (S1208); Storing the key value and the ID value in a proximity card and a terminal (S1209); Transmitting a storage completion signal from the proximity card to a proximity card terminal (S1210); and checking and ending the transmission signal; Proximity card registration method comprising a. In the method of opening and closing the door by a proximity card, Transmitting the card number from the proximity card to the proximity card terminal (S1302); Transmitting a key value corresponding to the transmitted card number to a proximity card (S1303); Activating a corresponding memory area by the transmitted key value (S1304); Transmitting an ID stored in the activated memory to a proximity card terminal (S1305); (S1307) decrypting the transmitted ID by a predetermined method (S1306), and then determining whether the door is opened or closed (S1307); After opening the door, generating a new key value in a predetermined manner (S1308) and generating an encryption key by encryption (S1400); Storing the newly encrypted key value and ID value (S1311); And Transmitting the newly encrypted key value and ID value to a proximity card (S1312); Door opening and closing method comprising a. In the encryption key generation method, Selecting a predetermined odd number that is not disclosed (S1401); Obtaining a common key by the selected number (S1402); Obtaining an Euler function with the selected number (S1403); Selecting a number that is mutually different from the derived function (S1404); Obtaining a predetermined key by Euclid's method using the derived mutually significant numbers (S1405); And And using the values derived in steps 1402 and 1404 as a public key and using the values derived in steps 1402 and 1405 as a private key (S1406.S1407).