KR200330153Y1 - Ultra low power electronic key using IrDA - Google Patents

Abstract

The present invention relates to an electronic key used with various electronic lock devices, a personal authentication electronic key for access control and encryption and decryption of important data, and an electronic key for personal authentication on the Internet. By registering the electronic key in advance with the electronic lock device and controlling the opening and locking of the electronic lock, it prevents illegal opening attempts by performing a procedure for authenticating by encrypted data interacting with the electronic lock device and the electronic key. It prevents the authentication of the copied electronic key, disables it, minimizes the standby current when the electronic key is not used, and minimizes the operating current when using the electronic key to operate with a weak current, prolonging the life of the battery and allowing the user to replace the battery It is designed to be easy to use, hard to do, very secure and economical.

Description

Ultra low power electronic key using IrDA

Conventionally used electronic keys are various, such as contact keys (i-Botton), RF remote control keys and proximity card keys (transport card keys and shape-modified products). However, these electronic keys have security problems that cannot prevent copying and other disadvantages. Looking at the problem of the prior art in detail with respect to each electronic key as follows. Firstly, i-Botton is a button-shaped metal case and a unique ID-Code and non-volatile memory (EEPROM), which are given when a semiconductor company produces it, and are very convenient to use. Although it is widely used in door locks because it is not necessary, even the novice electronics engineer can easily read ID-Code and nonvolatile memory (EEPROM), so it can be easily copied and emulated. Whenever it is used by domestic parent company, the floating encryption ID-Code is applied, but this method can prevent permanent copying but not temporary copying. That is, even if the variable ID code is changed every time it is used, the changed ID code is stored in the nonvolatile memory (EEPROM) inside the contact key, so if you copy it and use it before the original key, the lock device must be unlocked. will be. In addition, the lock device is used to connect the contact key, which is mainly an input / output port of the microcomputer and is exposed to the outside, and thus is very vulnerable to static electricity and electric shock. Secondly, the RF remote control key is mainly used for the remote control of the car and the digital door lock. However, when the battery is used, such as the digital door lock, the current of the RF receiver of the lock device is large, which causes a problem in battery life. Therefore, the RF receiver of the lock device cannot wait for a continuous signal and operates at a cycle of 1 to 2 seconds, which is inconvenient because the response of the signal is slow. In addition, due to the characteristics of RF, it is not possible to prevent the signal from leaking to the outside while in use. The RF electronic key uses a battery, so it is usually inconvenient to replace the battery every one to two years. Thirdly, proximity card keys have been widely used for access control and time and attendance management of offices, but recently, transportation cards and shape-modified products are used as electronic keys for digital door locks. In general, when the proximity card is used as a transportation card, the contents recorded inside the proximity card are encrypted to protect the contents from being recognized. However, when the proximity card is used as an electronic key, the proximity card operates by a unique ID code inside the proximity card. It can't prevent copying and emulation, and the drawback of the proximity card reader embedded in the lock device is high. As the working distance is only 10 ~ 20cm, it is inconvenient to use as a general electronic key. In addition, children or elderly people are inconvenient to carry, so they tend to avoid using it. Proximity card readers are widely used in subway, bus and parking management, so it is easy to purchase illegally, and if you increase the RF output and improve the performance of the antenna, the card can be read at 50 ~ 60Cm. It is possible to copy by reading the contents of.

Therefore, the present invention is intended to solve the problems of various conventional electronic keys. There is no conventional method for determining whether the electronic key is copied or not in the electronic lock device by using an ID code. In the present invention, the opening and locking of the electronic lock is controlled by authenticating the legitimacy using the encrypted encrypted variable ID-Code, instead of the encrypted data interacting with the electronic lock device. Therefore, the illegally copied electronic key makes it impossible to authenticate itself to the electronic log, thereby invalidating the copied electronic key and constructing an electronic key which is very secure and easy to use. In addition, in order to eliminate the inconvenience of replacing the battery when the user first purchases the battery or replacing the battery during use, the product is shipped with the battery installed as a default when the product is shipped. The standby current when the electronic key is not used is minimized. By minimizing the current consumption to operate with a weak current to extend the life of the battery it is characterized in that it implements an electronic key that requires little replacement of the battery in normal use. In fact, the current consumption of the IrDA electronic key of the present invention, the standby current of the microcomputer 102 is 0.1uA and the standby current of the IrDA 107 is 0.02uA. Therefore, when not using IrDA electronic key, the total standby current is 0.12uA (refer to maker spec.sheet). When using IrDA electronic key 10 times a day, average current consumption per hour is less than 0.1uA. Therefore, even if natural discharge is used when using a coin-type lithium battery, battery life is over 20 years.

1 is a diagram illustrating the principle of the operation of the electronic key.

2 is a flow chart of a software method of electronic key function.

Brief description of the main parts

100: switch 1 input 101: switch 2 input

102: microcomputer 103: memory

104: encryptor 105: decoder

106: IrDA connection device 107: IrDA

108: lithium battery

The present invention will be described in detail with reference to the accompanying drawings. Looking at the configuration of the electronic key of the present invention, the switch input (100) for instructing the opening and locking, the switch input (101) for separately using the opening and locking if necessary, the microcomputer performing the main function of the electronic key ( 102, a memory 103 for storing a unique ID-Code and an encryption / decryption key value, an encryptor 104 for encryption, a decoder 105 for decryption, an IrDA connection device 106 for supporting the IrDA protocol, IrDA 107, which is a non-contact signal transmission medium using infrared rays, and a lithium battery 108 for supplying power to an electronic key. However, the above configuration is a diagram of the function of the electronic key, and in reality, the memory 103 exists inside the microcomputer, and the encryptor 104, the decoder 105, and the IrDA access device 106 are implemented by the software of the microcomputer. Is common.

The principle of operation will be described in detail with reference to the accompanying drawings according to the flow of signals. In the state where the IrDA electronic key is not used, the microcomputer 102 and the IrDA 107 are in a power-down state by minimizing current consumption. When the user presses the switch 100 of the IrDA electronic key, the microcomputer 102 wakes up from the power down state and detects the state of the switch 100. When the on state of the switch 100 is detected, the microcomputer 102 sends the unique ID-Code of the electronic key stored in the memory 103 and the encryption key value used for encryption to the encryptor 104 to encrypt the ID-Code. To command. When the encryption is finished, the encrypted ID-Code is converted into IrDA data transmission protocol through IrDA access device 106, the IrDA 107 is activated, and serially transmitted data to the electronic lock device through IrDA 107 serially. After the transmission is completed, it waits for the random number data for authentication of the IrDA electronic key from the electronic lock device. If the data is not received within the specified time, the above process is ignored and the microcomputer 102 deactivates the IrDA 107 and then switches to the power-down state by minimizing the current consumption and waits for the next switch input. When the normal authentication request data is received through the IrDA 107 within a predetermined time, the microcomputer 102 reads the data through the IrDA connection device 106. This data is decrypted through the decoder 105, and then confirmed to be normal data transmitted from the registered electronic lock device. By sending the encrypted data through the request for the opening or locking of the electronic lock device, the microcomputer 102 deactivates the IrDA (107), then minimizes the current consumption to switch to the power-down state and wait for the next switch input. As described above, each time the user presses the switch 100, the function is repeated to perform a function as an IrDA electronic key.

As described above, the electronic key manufactured by the present invention has no risk of copying caused by the coding encryption of an ID using a non-volatile memory of a conventional contact electronic key (i-Botton) and operates in a non-contact manner. It is very strong and uses a mechanical key to lock the home, office, safe, car, and drawer by registering only one electronic key to N electronic locks without having to use N keys for N locks. If you carry one electronic key, you can open and lock it. If you lose your electronic key, you can use it with confidence because the old electronic key is automatically disabled if you purchase a new electronic key and register a new one without having to replace the electronic lock device. IrDA electronic key of this invention has 100 billion unique ID-Codes and duplicate ID-Codes do not exist in the world and copying is impossible, so not only the mechanical lock device but also the control of physical use of computer and encryption of important data of computer ㆍ It can be used as a personal authentication key for decryption and an electronic key for personal authentication on the Internet. In addition, with the development of semiconductor manufacturing technology, it is possible to implement an electronic key that operates with a weak current, and it is possible to manufacture an electronic key using IrDA, which is very economical, convenient, secure, and portable.

Claims (4)

To store the unique ID-Code and the encryption key value necessary for encryption in the electronic key that applies the unique ID-Code and the encrypted data to the electronic lock device to perform the opening and locking of the electronic lock device for access restriction and restriction of use. A memory 103, an encryptor 104 that performs an encryption function, and a decryptor 105 that performs a decryption function are configured to perform encryption / decryption under the control of the microcomputer 102, and to encrypt the IrDA 107 as a transmission medium. Electronic key device characterized in that for controlling the electronic lock device by transmitting and receiving the received data The electronic key device of claim 1, wherein the memory 103 is present in the microcomputer 102, and the encryptor 104, the decoder 105, and the IrDA access device 106 are implemented by software of the microcomputer. The method of claim 1, wherein the IrDA 107 operating by infrared rays as a data transmission medium simultaneously configures a transmitter and a receiver, and transmits and receives an electronic lock device and encrypted data to prevent data analysis inside the electronic key. Electronic key device having a copy protection function of the key 2. The microcomputer 102 of claim 1 activates the IrDA 107 only when the switch input 100 or the switch input 101 is valid, deactivates the IrDA 107 in the standby state, and the microcomputer 102 powers down itself. Electronic key device, characterized in that the operation to the weak current by minimizing the current consumption by switching to