KR101682548B1 - Communication security method in door lock system - Google Patents

Communication security method in door lock system Download PDF

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Publication number
KR101682548B1
KR101682548B1 KR1020150067461A KR20150067461A KR101682548B1 KR 101682548 B1 KR101682548 B1 KR 101682548B1 KR 1020150067461 A KR1020150067461 A KR 1020150067461A KR 20150067461 A KR20150067461 A KR 20150067461A KR 101682548 B1 KR101682548 B1 KR 101682548B1
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KR
South Korea
Prior art keywords
door lock
security key
portable terminal
communication channel
communication
Prior art date
Application number
KR1020150067461A
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Korean (ko)
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KR20160134056A (en
Inventor
박은민
정상우
김기영
Original Assignee
주식회사 아마다스
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Priority to KR1020150067461A priority Critical patent/KR101682548B1/en
Publication of KR20160134056A publication Critical patent/KR20160134056A/en
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Publication of KR101682548B1 publication Critical patent/KR101682548B1/en

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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/08—Access security
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B2047/0048—Circuits, feeding, monitoring
    • E05B2047/0071—Connecting lockparts by electronic communication means only, e.g. bus systems, time multiplexing
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B2047/0094—Mechanical aspects of remotely controlled locks

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Lock And Its Accessories (AREA)

Abstract

The present invention relates to a communication security method, and more particularly, to a communication security method of a door lock for enhancing security of communication between a portable terminal and a door lock in a door lock system that opens a door lock using a portable terminal. In order to achieve the above object, the present invention provides a communication security method for a door lock, comprising: a first pairing process between a door lock and a portable terminal; a step of transmitting the inherent security key to the portable terminal by the door lock; Generating a first security key by combining the currently allocated communication channel number and the currently allocated communication channel number; and forming a data communication channel with a communication channel number currently allocated between the door lock and the portable terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [

The present invention relates to a communication security method, and more particularly, to a communication security method of a door lock for enhancing security of communication between a portable terminal and a door lock in a door lock system that unlocks a door lock using a portable terminal.

In the case of mechanical door locks, there is an inconvenience of carrying a key, so an electrically operated door lock is used which can open the door through a password or fingerprint input.

Most of the electrically operated door locks open the door by inputting the password. It is troublesome to input the password every time the user opens the door. Recently, a door lock system for opening the door lock using the portable terminal has been developed .

In such a door lock system, the portable terminal searches the door lock via Bluetooth scanning, and when the user inputs a password for Bluetooth pairing to the portable terminal, the first pairing is performed between the portable terminal and the door lock through the password authentication procedure, Is registered. The portable terminal receives the key information from the door lock via the Bluetooth communication channel or stores the key information of the door lock.

Then, when the portable terminal approaches the door lock, pairing is automatically performed between the portable terminal and the door lock. When the user inputs an event for opening the door lock to the portable terminal, the key information is transmitted to the door lock through the Bluetooth communication channel and the door lock is opened.

The important data in the communication between the portable terminal and the door lock is a communication frame for controlling the door lock. However, there is a problem that another person attempts to hack the communication frame during the Bluetooth communication between the portable terminal and the door lock, so that the key information of the door lock can be stolen.

Registration No. 10-0735382

SUMMARY OF THE INVENTION It is an object of the present invention to provide a communication security method of a door lock that can maintain communication security between a portable terminal and a door lock in a door lock system that opens a door lock using a portable terminal .

It is another object of the present invention to provide a communication security method of a door lock which can not know key information of a door lock even if there is a hacking on a communication frame during communication between the portable terminal and the door lock.

In order to achieve the above object, the present invention provides a communication security method for a door lock, comprising: a first pairing process between a door lock and a portable terminal; a step of transmitting the inherent security key to the portable terminal by the door lock; Generating a first security key by combining the currently allocated communication channel number and the currently allocated communication channel number; and forming a data communication channel with a communication channel number currently allocated between the door lock and the portable terminal.

According to another aspect of the present invention, there is provided a communication security method for a door lock that is connected to a portable terminal by data communication, the method comprising: when the door lock is paired with the portable terminal for the first time, When the first security key is generated by combining the unique security key and the currently allocated communication channel number in the portable terminal, a data communication channel is formed with the communication channel number currently allocated between the door lock and the portable terminal do.

Also, a door lock having a communication security function includes a local communication unit for forming a data communication channel with a portable terminal at a currently assigned communication channel number while changing a communication channel number by hopping of a communication channel, and transmitting and receiving data through the data communication channel A memory for storing a unique security key of the door lock and a security key generated each time the communication channel number is changed; and a memory for storing a security key generated by combining a current communication channel number assigned to the local communication unit with a unique security key or a most recently generated security key, A data decryption unit for decrypting an encrypted communication frame of the mobile terminal using the secret key generated by the secret key generation unit; Upon receipt of the received encrypted communication frame, the security key stored in the memory is extracted And a controller for causing the door lock driving unit to decode the encrypted communication frame by the data decoding unit and to release the locking unit when the decoded communication frame matches the pre-stored information.

As described above, according to the present invention, since a new security key is generated for each communication channel hopping during communication between the portable terminal and the door lock, it is impossible to decode the communication frame because the security key is unknown even if there is an external hacking.

Accordingly, there is almost no possibility that the key information is leaked during the door lock communication with the portable terminal, so communication security between the portable terminal and the door lock can be maintained.
In addition, since the data communication channel between the portable terminal and the door lock is necessarily formed only when a new security key generated by synthesizing the communication channel number exists in the portable terminal, the data communication connection between the illegal portable terminal and the door lock is originally blocked, Can be further strengthened.

1 is a schematic diagram of a door lock system according to the present invention;
FIG. 2 is an internal configuration diagram of a door lock according to the present invention. FIG.
3 is a signal flow diagram for the first pairing between a door lock and a portable terminal in the security communication method of the door lock according to the present invention.
4 is a flowchart illustrating an internal process of a door lock in a security communication method of a door lock according to the present invention.
5 is a signal flow diagram after the second pairing between the door lock and the mobile terminal in the door lock security communication method according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the operation and effect thereof will be clearly understood through the following detailed description.

Before describing the present invention in detail, the same components are denoted by the same reference symbols as possible even if they are displayed on different drawings. In the case where it is judged that the gist of the present invention may be blurred to a known configuration, do.

Fig. 1 shows a schematic configuration of a door lock system according to the present invention.

Referring to FIG. 1, a door lock 100 is paired with a portable terminal 200 and receives a communication frame from the portable terminal 200 through a data communication channel.

The door lock 100 may be connected to a plurality of portable terminals 200, 200-1, 200-2, or may be connected at the same time. The door lock 100 receives and decrypts the encrypted key information from the portable terminal 200 and releases the locked state when the decrypted key information matches the pre-stored key information.

2 shows an internal configuration of a door lock according to the present invention.

2, the door lock 100 includes a local communication unit 10, a security key generating unit 12, a data decoding unit 14, an input unit 16, a memory 18, a door lock driving unit 20, (22), a control unit (24), and the like.

The local area communication unit 10 is a part for communicating with the mobile terminal 200. [ The short-range communication unit 12 forms a data communication channel with the portable terminal 200 at the currently assigned communication channel number by changing the communication channel number by hopping the communication channel, and transmits / receives data through the data communication channel. The local communication unit 12 according to the present invention may be configured as a Bluetooth communication module.

The security key generation unit 12 generates a new security key by combining the current communication channel number assigned to the local communication unit 12 with the unique security key of the door lock or the security key most recently generated from the door lock.

The data decryption unit 14 decrypts the encrypted communication frame of the portable terminal 200 using the secret key generated by the secret key generation unit 12. [

The input unit 16 is a part for inputting the password of the door lock 100, and may be constituted by a push button or a capacitive touch button. If the user does not have the portable terminal 200 or does not register the door lock 100 in the portable terminal 200, the lock state of the door lock 100 can be released by inputting the password through the input unit 16 .

The memory 18 is a part for storing door lock control programs and various data. The memory 18 stores a security key generated each time the unique security key and the communication channel number of the door lock 100 are changed.

The door lock driving unit 20 causes the locking unit 22 to be opened or closed according to a control command of the control unit 24. [ The door lock driving unit 20 releases the locking state of the locking unit 22 upon receiving the opening command from the control unit 24 and locks the locking unit 22 when receiving the closing command from the control unit 24.

The lock portion 22 includes a motor (not shown), a latch (not shown), and the like. The latch is moved forward or backward by the motor to lock the door or unlock the door. The motor of the locking part 22 operates by receiving a driving signal from the door lock driving part 20.

The control unit 24 is a part for controlling the overall operation of the door lock 100. The control unit 24 extracts the security key stored in the memory 18 and outputs the encrypted communication frame to the data decryption unit 14 when receiving the encrypted communication frame received from the portable terminal 200 through the local communication unit 10 .

When the key information (door lock password) extracted from the decoded communication frame coincides with the information stored in the memory 18, the control unit 24 outputs an open command to the door lock driving unit 20 to drive the door lock driving unit 20.

FIG. 3 is a diagram illustrating a signal flow at the time of first pairing between a door lock and a portable terminal in the security communication method of the door lock according to the present invention.

Referring to FIG. 3, first, the portable terminal 200 performs scanning to search for a door lock, and first pairing is established between the door lock 100 and the portable terminal 200 through a password authentication procedure (S10).

When the door lock 100 and the portable terminal 200 are initially connected (paired), the door lock 100 transmits the security key to the portable terminal 200 (S12). The first security key sent by the door lock 100 to the mobile terminal 200 at the time of the first pairing is defined as a unique security key. The unique security key may be stored in the memory 18 of the door lock 100 or may be generated by the security key generating unit 12 of the door lock 100 from the product launch.

The portable terminal 200 generates a new security key by combining the unique security key received from the door lock 100 and the current communication channel number (S14). Here, if the current communication channel number is, for example, a channel number 1, the security key created by combining the unique security key and the channel number 1 may be the first security key.

When an event for controlling the door lock 100 is input in the portable terminal 200, a data communication channel is established between the door lock 100 and the portable terminal 200 at the current assigned communication channel number in step S16. Here, if the current communication channel number is the channel number 1, the data communication channel can be indicated as the data communication channel # 1.

The portable terminal 200 encrypts the communication frame with the first security key and transmits the encrypted communication frame to the door lock 100 (S18). The Bluetooth link layer packet includes a preamble, an access address, a packet data unit (PDU), an error code (CRC) field, Cyclic Redundancy Check).

The packet data unit, which is a communication frame, is composed of a command code, a payload (data), and an end code. Key information capable of unlocking the door lock 100 is loaded in a payload.

When the door lock 100 receives the communication frame encrypted with the first security key from the portable terminal 200, the door lock 100 synthesizes the unique security key and the channel number 1, which is the current communication channel number, like the portable terminal 200, (S20), and decrypts the encrypted communication frame received from the mobile terminal using the first secret key (S22).

When the key information extracted through the demodulation of the communication frame coincides with the stored information, the door lock 100 releases the locked state.

Thereafter, when the communication channel between the door lock 100 and the portable terminal 200 is hopped and the communication channel number is changed, the current data communication channel is also changed (S24). If the changed communication channel number is, for example, channel number 2, the data communication channel is also changed from data communication channel # 1 to data communication channel # 2.

Then, the mobile terminal 200 generates a new security key by combining the first security key and the changed communication channel number (S26). Here, the security key created by combining the first security key and the channel number 2 may be a second security key.

Next, when the portable terminal 200 transmits a communication frame encrypted with the second security key to the door lock 100 (S28), the door lock 100 also synthesizes the first security key and the changed channel number 2 2 security key (S30), and decrypts the encrypted communication frame received from the mobile terminal 200 using the second security key (S32).

Whenever the communication channel number is changed by the hopping of the communication channel between the door lock 100 and the portable terminal 200, the door lock 100 and the portable terminal 200 transmit the changed communication channel number and the most recently generated security A new security key is regenerated using the key and the last changed security key is used when the door lock 100 and the portable terminal 200 are reconnected.

4 is a flowchart illustrating an internal process of the door lock in the security communication method of the door lock according to the present invention.

4, when the first pairing is connected through the password authentication process between the door lock 100 and the portable terminal 200 (S100), the door lock 100 transmits a unique security key to the portable terminal 200 S102).

The data communication channel is formed by the communication channel number currently assigned between the door lock 100 and the portable terminal 200 in step S104 and the door lock 100 is encrypted by the first security key from the portable terminal 200 through the data communication channel, (S106).

Then, the door lock 100 generates a first secret key by combining the currently allocated communication channel number and the unique secret key (S108), and transmits the encrypted communication with the first secret key of the portable terminal 200 using the first secret key The frame is decoded (S110).

If there is no communication channel hopping, the door lock 100 continuously receives a communication frame encrypted with the first security key from the portable terminal 200 (step S112) And performs decryption using the first secret key.

On the other hand, when hopping of the communication channel occurs, the door lock 100 receives the communication frame encrypted with the second security key from the portable terminal 200 (S114). When receiving the communication frame encrypted with the second security key from the portable terminal 200, the door lock 100 generates the second security key by combining the changed communication channel number and the first security key (S116) And decrypts the communication frame encrypted with the second security key of the portable terminal 200 using the secret key (S118).

FIG. 5 shows a signal flow after the second pairing between the door lock and the portable terminal in the door lock security communication method according to the present invention.

Referring to FIG. 5, a pairing is established between the door lock 100 and the portable terminal 200 (S40). Here, the pairing is a case in which the portable terminal 200 approaches the door lock 100 and is automatically connected after the pairing where the door lock 100 and the portable terminal 200 are initialized through the password authentication procedure.

When an event for controlling the door lock 100 is inputted in the next portable terminal 200, a data communication channel # 1 is formed with the current communication channel number between the door lock 100 and the portable terminal 200 in step S42. Here, an event for door lock control means an operation of inputting key information or releasing key information for unlocking the door lock in the portable terminal 200. [

Then, the mobile terminal 200 encrypts the communication frame using the last generated security key, that is, the most recently generated security key (denoted by the Nth security key here) (S44).

When the communication frame encrypted with the N-th security key is transmitted to the door lock 100 at step S46, the door lock 100 transmits the communication frame encrypted with the N-th security key, which is the most recently generated security key, The encrypted communication frame is decrypted (S48).

When the communication channel number is changed by the hopping of the communication channel, the data communication channel # 2 is formed with the changed communication channel number (S50), and the portable terminal 200 synthesizes the Nth security key and the changed communication channel number N + 1 security key is generated (S52).

Next, the portable terminal 200 transmits the communication frame encrypted with the (N + 1) -th security key to the door lock 100 (S54). As described above with reference to FIG. 3, the door lock 100 generates an (N + 1) -th security key in the same manner and decrypts a communication frame encrypted with the (N + 1) -th security key of the portable terminal 200.

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention.

Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

10: Local area communication unit 12: Security key generation unit
14: Data decoding unit 16: Input unit
18: memory 20: door lock driver
22: lock part 24: control part
100: Door lock 200: Portable terminal

Claims (10)

A first pairing is performed between the door lock and the portable terminal,
Transmitting the unique security key inside the portable terminal to the door lock;
Generating a first secret key by combining the unique security key and the currently allocated communication channel number;
When an event for controlling the door lock is input in the portable terminal, only when there is a first security key generated by synthesizing the currently allocated communication channel number, data communication is performed with the communication channel number currently allocated between the door lock and the portable terminal A method for secure communication of a door lock comprising the step of forming a channel. The method according to claim 1,
The portable terminal encrypting the communication frame with the first security key and transmitting the encrypted communication frame to the door lock;
Generating a first secret key by combining the unique security key and the currently assigned communication channel number;
Further comprising decrypting the encrypted communication frame received from the portable terminal with the first security key generated by the door lock. The method according to claim 1,
If a currently allocated communication channel number is changed by hopping a communication channel after the data communication channel between the door lock and the portable terminal is established, the portable terminal generates a second security key by combining the changed communication channel number and the first security key Step,
The portable terminal encrypting the communication frame with the second security key and transmitting the encrypted communication frame to the door lock;
Generating a second security key by combining the communication channel number and the first security key with the door lock changed,
And decrypting the encrypted communication frame with the second security key generated by the door lock. When the first pairing is performed between the door lock and the portable terminal, transmitting the inherent security key inside the door lock to the portable terminal;
When an event for controlling the door lock is input in the portable terminal, only when there is a first security key generated by synthesizing a communication channel number currently allocated, the communication channel number currently allocated between the door lock and the portable terminal Wherein the step of forming the door lock includes the step of forming the door lock. 5. The method of claim 4,
Receiving the communication frame encrypted with the first security key from the portable terminal through the data communication channel;
Generating a first secret key by combining the unique security key and the currently assigned communication channel number;
Further comprising decrypting the encrypted communication frame received from the portable terminal with the first security key generated by the door lock. 5. The method of claim 4,
When the communication channel number currently allocated by the hopping of the communication channel is changed after the data communication channel is established between the door lock and the portable terminal, a second security key generated by synthesizing the changed communication channel number and the first security key from the portable terminal Receiving an encrypted communication frame;
Generating a second security key by combining the changed communication channel number and the first security key;
And decrypting the encrypted communication frame with the second security key generated by the door lock. When a communication channel number is changed by hopping of a communication channel to form a data communication channel with a portable communication terminal at a currently assigned communication channel number and when an event for door lock control is inputted at the portable terminal, A local communication unit for transmitting and receiving data through the data communication channel only when the generated security key exists,
A memory for storing a unique security key of the door lock and a security key generated each time the communication channel number is changed;
A security key generator for generating a new security key by combining the current communication channel number assigned to the local communication unit with the unique security key or the most recently generated security key,
A data decryption unit for decrypting the encrypted communication frame of the mobile terminal using the secret key generated by the secret key generation unit;
When receiving the encrypted communication frame received from the portable terminal through the local communication unit, extracts the security key stored in the memory, decrypts the encrypted communication frame by the data decoding unit, and stores the decrypted communication frame And a control unit for driving the door lock driving unit to release the lock when the information matches the information. 8. The method of claim 7,
Wherein the control unit transmits the unique security key of the door lock to the portable terminal through the local communication unit when the portable terminal and the local communication unit are paired for the first time,
When an event for controlling the door lock is input in the portable terminal, only when there is a first security key generated by synthesizing the currently allocated communication channel number with the portable terminal, the communication currently allocated between the door lock and the portable terminal And a data communication channel is formed by a channel number. 9. The method of claim 8,
When the local communication unit receives a communication frame encrypted with the first security key from the portable terminal through the data communication channel,
The control unit transmits the unique security key and the currently allocated communication channel number to the secret key generation unit to generate the first secret key,
And transmits the encrypted communication frame input through the local communication unit to the data decryption unit so that the encrypted communication frame is decrypted by the first security key generated by the security key generation unit. . 9. The method of claim 8,
After the data communication channel between the door lock and the portable terminal is established, the communication channel number currently assigned by the hopping of the communication channel is changed, and the local communication unit transmits the changed communication channel number and the first security key Upon receiving the communication frame encrypted with the second security key,
The controller transmits the changed communication channel number and the first secret key to the secret key generator to generate the second secret key,
And the encrypted communication frame transmitted through the local communication unit is transmitted to the data decryption unit so that the encrypted communication frame is decrypted with the second security key generated by the secure key generation unit. .
KR1020150067461A 2015-05-14 2015-05-14 Communication security method in door lock system KR101682548B1 (en)

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KR101446629B1 (en) * 2013-07-17 2014-10-06 한국전자통신연구원 Apparatus and method for secure data transmission in wireless communication system

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