KR20060132109A - Electrical sealing method of rfid tag - Google Patents

Abstract

A method for electronically sealing an RFID(Radio Frequency IDentification) tag is provided to check breakage of sealing by erasing a part of information stored in an internal memory of the RFID tag with a memory erasing circuit operated when a signal line is cut to attach/detach the RFID tag and reading RFID tag information with an external reader. The RFID tag separately stores sealing data to a sealing data memory(124) to determine the breakage of an external sealing wire, and includes a controller(121) for making the breakage of the sealing detected by erasing all or partial sealing data when the sealing is cut. A switching circuit using a digital logic gate is separately formed to the inside of the controller and is connected to an external closed sealing circuit(130). If the sealing circuit is cut, the sealing data is erased by operating a memory erasing circuit(125) inside the controller according to the switching circuit.

Description

Electronic sealing method of RFID tag {Electrical sealing method of RFID tag}

1 is a configuration diagram of an RFID tag controller for implementing a sealing device

Figure 2 is an example of attaching the RFID tag implemented seal device

<Description of reference numerals for the main parts of the drawings>

110. Transceiver antenna and power supply circuit

120 ... RFID Tag Chipset

121 ... RFID Chipset Internal Controller 122 ... General Data Area

One Time Programmable ROM (OTPROM) 123 Sealed data area

125 ... Memory erase area

130 ... closed loop for sealing

210 ... RFID tag with seal

220 ... closed loop line for sealing

230 ... RFID tagged object

The RFID system consists of five parts.

  1. Transponders that store unique information, often called tags

  2. Transceivers (readers or readers) that read and decode

  3. Host computer (server)

  4. Network

  5. Applications (ERP, SCM)

The tag consists of an IC chip and an antenna and comes in various shapes and sizes. The tags implanted under the skin to track animals are as small as a pencil lead and only 1 cm long. The main functions of the IC chip are data storage, memory size (25-bit to 512 KB or more), memory type (read-only, read-write type, write-once and read-once), memory type (EEPROM, ferroelectric RAM). There are various types according to (FRAM) RFID systems can be divided into Inductively coupled and Electromagnetic wave methods according to the wireless connection method. Is used as a medium-to-long-range RFID, the mutual induction method uses a coil antenna, and the electromagnetic wave method uses a high frequency antenna to wirelessly connect to each other. All the energy needed for operation is supplied by the reader, so the antenna coil of the reader generates a strong magnetic field in the surrounding area. A part of the magnetic field generated is inductive voltage to the coil antenna of the tag which is separated from the reader and rectified and supplied as energy for the IC The electromagnetic tag does not receive enough power from the reader to drive the IC chip. Therefore, it may include an additional battery for long range recognition (active).

Readers and tags process baseband data using various digital encodings. The radio signal is mainly transmitted by converting the base signal into a high frequency signal using three basic digital modulation schemes, namely, Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK). However, in certain frequency bands (UHF bands in the United States), only a specific modulation scheme is required to reduce the effects of electromagnetic waves or interference with other communication systems. The most widely used is spread spectrum (SS). Among the SS, a direct sequence (DS) used for a CDMA mobile phone or a WLAN and a frequency hopping (FS) used for Bluetooth are mainly used. However, applying this modulation method to a tag requires more complicated circuits, which increases the price. Actually, only the reader uses this modulation method, and the tag is made wideband to cover the entire frequency of the SS, and signals are processed using ASK. send. Various signal processing is performed to increase the reliability of other data information, such as error rate reduction method using a cyclic redundancy check (CRC) method, Aloha or carrier sense multiplex used in a wireless LAN to distinguish multiple tags. Anti-collision method using a method similar to Access) and data security method using symmetric or asymmetric encryption algorithm for data protection are applied. In particular, such signal processing depends on the functionality of the tag memory.

 In addition, a seal is a mark designed to be damaged when attaching a specific object to an object and then attaching or detaching the specific object from the attachment site. The seal is a mark configured to confirm the damage or deformation of the object through the damage of the specific object. Such a seal is widely used when the original object is to be preserved, such as a license plate used to prevent a specific object (a license plate) and an object (car) from being damaged or detached in the state of attachment at the time of application.

The present invention adds an additional circuit capable of erasing a part of the RFID internal memory in order to add a sealing function to the RFID tag, and extracts a trigger signal line for operating the memory erasing circuit to the outside of the RFID tag, When the signal line is cut to attach / detach the RFID tag arbitrarily by binding and attaching the signal line drawn to the object to which the tag is attached, the memory erasing circuit operates to lose a part of the information stored in the internal memory. If it is detected, it is possible to know whether the seal is broken.

In the electronic sealing system of the RFID tag of the present invention for achieving the above object is manufactured by adding a closed circuit terminal for configuring the seal separately from the antenna terminal drawn out from the general RFID tag controller. In addition, the memory area of the internal controller is divided into an area for storing general data, an area erased when the seal is broken, and an area capable of only one write operation in order to compare with the seal data area. After attaching the tag to the object to be attached, the sealed closed loop is configured and when RFID tag data initialization is performed, the digitally encrypted data is simultaneously recorded in the OTPROM area and the sealed data area separately from the normal data initialization. When the erase circuit operates, the seal data area data is lost, so that the OTPROM data and the seal data area are different from each other so that the RFID seal can be detected. At this time, the information stored in the OTPROM data and the seal data area is used only for the purpose of determining whether the seal is damaged by the internal controller, so that the information cannot be confirmed from the outside, so that artificial recovery is impossible after the seal data is destroyed.

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

1 is a configuration diagram of an RFID tag controller for implementing a sealing device of the present invention. There is a general transmit and receive antenna and power circuit 110 and the RFID tag chipset 120 and additionally closed circuit 130 is configured to be connected to the outside. The external closed circuit consists of a simple wire and attaches it to the RFID tag attachment object 230 as shown in Figure 2 and then attaches the closed circuit for sealing. After the attachment is completed, RFID tag initialization is performed and the basic information of the object to be attached is recorded in the general data area 122 of FIG. 1, and the digitally encrypted seal data is recorded in the OTPROM 123 and the seal data area 124, respectively. do. Thereafter, when the sealing circuit 130 is broken, a trigger signal is generated in the data erasing circuit 125, and the data erasing circuit 125 operates by the trigger signal to erase data in the sealing data region 124. When the RFID tag is read by the reader, the RFID tag loses the sealing data and transmits abnormal information to the reader, so that the reader can immediately recognize whether the RFID tag is broken or not. The data erasing circuit for this operation is used as a trigger signal by adding a simple digital logic gate to the existing RFID tag chipset design in the existing internal circuit design, and when the corresponding trigger signal is input, the erase current in the sealed data area composed of flash memory, etc. It is possible to implement simply by configuring a simple switch circuit to apply a. Therefore, the impact on the existing RFID tag chipset design is minimal, so that the sealing function can be implemented without affecting the existing RFID function.

When applying this RFID tag's electronic sealing method to logistics and vehicle management, which are currently recognized as the main application fields of RFID, in the case of logistics, product damage or partial loss can be checked in the logistics process from the delivery of the product to the destination. In the case of a vehicle, when the vehicle is sealed from the point of registration of the vehicle, forgery and change of the license plate can be detected remotely, thereby preventing theft of the vehicle in advance.

Claims (4)

RFID tag with controller configured to detect whether the seal is broken by storing the seal data separately in the internal controller to determine whether the external seal wire is damaged in the RFID tag and erasing part or all of the seal data when cutting the seal. The method of claim 1, The seal data is configured separately from the general data area and the OTPROM area, and the RFID tag is attached, and digitally encrypted information is stored in the OTPROM area and the sealed data area during data initialization, and the OTPROM and the seal data are compared and analyzed when the reader requests information. RFID tag configured to respond to reader after determining whether seal is broken The method of claim 1, RFID tag configured to separately configure a switching circuit using a digital logic gate inside the controller and connect it with an external sealing closed circuit to cut the sealing data by operating the sealing data erasing circuit inside the controller by the switching circuit when the sealing closed circuit is cut. The method of claim 2, Separate the general data area, OTPROM area, and sealed data area so that the information in the OTPROM area or the sealed data area cannot be checked after sealing through an external reader, so that the sealed data recovery is impossible at random after loss of the sealing data. RFID tag configured to meet the requirements of sealing

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