CN107045643A - The high secrecy ultrahigh frequency RFID system perceived suitable for ITS Information - Google Patents
The high secrecy ultrahigh frequency RFID system perceived suitable for ITS Information Download PDFInfo
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- CN107045643A CN107045643A CN201611262998.8A CN201611262998A CN107045643A CN 107045643 A CN107045643 A CN 107045643A CN 201611262998 A CN201611262998 A CN 201611262998A CN 107045643 A CN107045643 A CN 107045643A
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- Prior art keywords
- rfid
- reader
- label
- write line
- ultrahigh frequency
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
Abstract
The invention discloses a kind of high secrecy ultrahigh frequency RFID system perceived suitable for ITS Information, including server, ultrahigh frequency radio frequency identification (RFID) reader and RFID tag.The ultrahigh frequency radio frequency identification (RFID) reader to RFID tag by sending signal, so as to obtain label data.The analog front-end chip of the ultrahigh frequency radio frequency identification (RFID) reader is integrated with power amplifier and using passive frequency mixer as radio-frequency front-end, realizes the remote reading of label and substantially increases the sensitivity of read write line.Integrated ECC codings and decoding circuit, improve read-write Error Control efficiency, reduce label cost in the SoC chip of the ultrahigh frequency radio frequency identification (RFID) reader.The ultrahigh frequency radio frequency identification (RFID) reader realizes the method that authentication accesses the server, effectively prevents sensitive information from leaking.Integrated corresponding error correcting code circuitry in the RFID tag, improves read write line and reads success rate.The read write line employs dynamic encrypting method when reading label, effectively prevents that label from being cloned on a large scale.
Description
Technical field
The present invention relates to radio RF recognition technology field, particularly a kind of high guarantor perceived suitable for ITS Information
Close ultrahigh frequency RFID system.
Background technology
Radio RF recognition technology (Radio Frequency Identification, RFID) is a kind of contactless
Automatic identification technology, by radiofrequency signal automatic identification target and obtains related data.RFID can carry out multiple target and be identified,
Also moving target can be identified.According to the difference of working frequency, RFID system can be divided into low frequency (125kHz), high frequency
(13.56MHz), hyperfrequency (860MHz~930MHz) and microwave system (2.45GHz) etc..Wherein, hyperfrequency (UHF) RFID systems
The communication between reader and electronic tag is realized as unified using electromagnetic backscatter principle, multiple electricity can be disposably read
Subtab, penetrability are relatively strong, can be repeated several times read-write, data transfer rate comparatively fast, and passive electronic label has cost phase
To relatively low, small volume, using more convenient, reliability is higher and the features such as the longer life-span.UHF RFID techniques are progressively expanded
To fields such as modern logistics, ecommerce, traffic management, E-Government and military management.
At this stage there is the shortcomings of cost is higher, security is not enough in ultra-high frequency RFID technology, constrain the development of Internet of Things.
In addition, China's UHF RFID industries are also weaker, large-scale application is premature.Ultrahigh frequency RFID further to be promoted in state
The economic every field of the people is widely used, Ultra Low Cost requirement except meeting electronic tag, in addition it is also necessary to which solving read-write data can
By the leakage of data between property and accuracy, read write line and label, read write line and database, open inquiry and monitored etc. ask
Topic.
The content of the invention
Will it is an object of the invention to provide a kind of reliability, accuracy and security for meeting data transmission of internet of things
Ask, and electronic tag Ultra Low Cost requirement be applied to ITS Information perceive high secrecy ultrahigh frequency RFID system.
The technical solution for realizing the object of the invention is：A kind of high secrecy superelevation perceived suitable for ITS Information
Frequency RFID system, the system is based on distributed cipher key, including server, ultrahigh frequency radio frequency identification (RFID) reader and RFID tag,
The ultrahigh frequency radio frequency identification (RFID) reader includes ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip, ultrahigh frequency radio frequency identification (RFID) reader
SoC chip, using the authentication mechanism for encrypting for unique number of OTP in ultrahigh frequency radio frequency identification (RFID) reader, realizes that ultrahigh frequency RFID is read and write
Device authentication accesses background server/database, and the ultrahigh frequency radio frequency identification (RFID) reader reads stamp methods using dynamic encryption, by dynamic
State password realizes the anti-clone of label；The RFID tag is integrated with corresponding error correcting code circuitry.
Further, the ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip is integrated with the power that transmission power is 20dBm
Amplifier.
Further, the ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip is integrated with passive frequency mixer.
Further, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with the power amplification that transmission power is 25dBm
Device.
Further, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with electronics error correcting code coding and decoding circuit, tool
Body is as follows：
Read write line is given birth to all data by the error correction circuit in read write line chip when writing the data of RFID tag
Into ECC, and together in write-in RFID tag；When reading label, then label data and ECC are read back together, read
Read device and first carry out error correcting code decoding, then carry out CRC check；Error correcting code error correction scope is no more than for error code number, reader is just
It can correct.
Further, the authentication mechanism for encrypting using for unique number of OTP in ultrahigh frequency radio frequency identification (RFID) reader, is realized super
High frequency RFID reader authentication accesses background server/database, specific as follows：
Added in read write line and unique number of read write line is added in OTP modules, OTP modules, background data base is according to read write line
Unique number carries out grading authorized access to each read write line；Read write line passes through network and backstage after label data read-write is completed
Server sets up communication connection, then being read with read write line OTP, formed by the OTP coded datas after public key encryption
Authentication data send jointly to backstage read write line Verification System, after backstage read write line certification decrypts data by private key, with
Database mandate read write line list where label is compared, to confirm whether read write line is in the scope of authority, if right and wrong
Read write line is authorized, then can not obtain all the elements belonging to the label in data；If authorizing read write line, then complete in corresponding
The inquiry of appearance, so as to realize the system authentication of read write line.
Further, the described ultrahigh frequency radio frequency identification (RFID) reader reads stamp methods using dynamic encryption, passes through dynamic password
The anti-clone of label is realized, it is specific as follows：
Read write line is when reading label, while reading the label data content and dynamic symmetry password in label, Ran Houyi
Rise and the two data are sent to background server；Dynamic symmetry password will be compared with the authentication password on background server
It is right, if unanimously, server sends the response to read write line；After confirmation is read and write successfully, it is close that read write line produces one group of new dynamic
Code is simultaneously write in label and background server simultaneously, and symmetric dynamic renewal is carried out to password；At this moment if clone's label, due to
Can not be upgraded in time dynamic symmetry password, and the data in label are replicated into clone completely even in some time, but due to can not
Upgraded in time dynamic symmetry password with background server, therefore, it is possible to be recognized by the system as illegal label, so as to prevent label quilt
Clone.
Further, interior integrated corresponding error correcting code circuitry during the RFID tag, specific as follows：
The integrated corresponding error correcting code circuitry in RFID tag, reader then integrated corresponding error decoding circuit or soft
Part；Label first passes through CRC circuit to data plus check code, then carries out Error Correction of Coding transmission；Reader first carries out error correcting code
Decoding, then carries out CRC check；Error correcting code error correction scope is no more than for error code number, reader can just be corrected：It is only continuous
The not correctable error that multiple error codes are caused, is just found by CRC schools code, and requires to retransmit.Interior integrated phase during the RFID tag
The error correcting code circuitry answered, improves ultrahigh frequency radio frequency identification (RFID) reader success rate.
Compared with prior art, its remarkable advantage is the present invention：(1) the remote reading and significantly of label, is realized
Improve the sensitivity of read write line；(2) read-write Error Control efficiency, is improved, label cost is reduced；(3) read-write, is realized
Effective authentication between device and background server, effectively prevents sensitive information from leaking；(4), effectively prevent that label from being advised greatly
Mould " clone ".
Brief description of the drawings
The structure chart for the high secrecy ultrahigh frequency RFID system that Fig. 1 perceives for the present invention suitable for ITS Information.
Fig. 2 is the workflow diagram that ultrahigh frequency radio frequency identification (RFID) reader of the present invention reads RFID tag data.
Fig. 3 is the bi-directional authentification figure of RFID tag of the present invention and background server.
Fig. 4 realizes that the anti-clone of RFID tag schemes for the present invention by dynamic password.
Fig. 5 is the Error-Control Coding figure of increase ECC module in RFID tag of the present invention.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings.
The high secrecy ultrahigh frequency RFID system perceived with reference to Fig. 1, the present invention suitable for ITS Information, the system is based on
Distributed cipher key, including server, ultrahigh frequency radio frequency identification (RFID) reader and RFID tag,
The ultrahigh frequency radio frequency identification (RFID) reader includes ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip, ultrahigh frequency radio frequency identification (RFID) reader
SoC chip, using the authentication mechanism for encrypting for unique number of OTP in ultrahigh frequency radio frequency identification (RFID) reader, realizes that ultrahigh frequency RFID is read and write
Device authentication accesses background server/database, and the ultrahigh frequency radio frequency identification (RFID) reader reads stamp methods using dynamic encryption, by dynamic
State password realizes the anti-clone of label；The RFID tag is integrated with corresponding error correcting code circuitry.
Further, the ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip is integrated with the power that transmission power is 20dBm
Amplifier.
Further, the ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip is integrated with passive frequency mixer.
Further, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with the power amplification that transmission power is 25dBm
Device.
Further, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with electronics error correcting code coding and decoding circuit, tool
Body is as follows：
Read write line is given birth to all data by the error correction circuit in read write line chip when writing the data of RFID tag
Into ECC, and together in write-in RFID tag；When reading label, then label data and ECC are read back together, read
Read device and first carry out error correcting code decoding, then carry out CRC check；Error correcting code error correction scope is no more than for error code number, reader is just
It can correct.
Further, the authentication mechanism for encrypting using for unique number of OTP in ultrahigh frequency radio frequency identification (RFID) reader, is realized super
High frequency RFID reader authentication accesses background server/database, specific as follows：
Added in read write line and unique number of read write line is added in OTP modules, OTP modules, background data base is according to read write line
Unique number carries out grading authorized access to each read write line；Read write line passes through network and backstage after label data read-write is completed
Server sets up communication connection, then being read with read write line OTP, formed by the OTP coded datas after public key encryption
Authentication data send jointly to backstage read write line Verification System, after backstage read write line certification decrypts data by private key, with
Database mandate read write line list where label is compared, to confirm whether read write line is in the scope of authority, if right and wrong
Read write line is authorized, then can not obtain all the elements belonging to the label in data；If authorizing read write line, then complete in corresponding
The inquiry of appearance, so as to realize the system authentication of read write line.
Further, the described ultrahigh frequency radio frequency identification (RFID) reader reads stamp methods using dynamic encryption, passes through dynamic password
The anti-clone of label is realized, it is specific as follows：
Read write line is when reading label, while reading the label data content and dynamic symmetry password in label, Ran Houyi
Rise and the two data are sent to background server；Dynamic symmetry password will be compared with the authentication password on background server
It is right, if unanimously, server sends the response to read write line；After confirmation is read and write successfully, it is close that read write line produces one group of new dynamic
Code is simultaneously write in label and background server simultaneously, and symmetric dynamic renewal is carried out to password；At this moment if clone's label, due to
Can not be upgraded in time dynamic symmetry password, and the data in label are replicated into clone completely even in some time, but due to can not
Upgraded in time dynamic symmetry password with background server, therefore, it is possible to be recognized by the system as illegal label, so as to prevent label quilt
Clone.
Further, interior integrated corresponding error correcting code circuitry during the RFID tag, specific as follows：
The integrated corresponding error correcting code circuitry in RFID tag, reader then integrated corresponding error decoding circuit or soft
Part；Label first passes through CRC circuit to data plus check code, then carries out Error Correction of Coding transmission；Reader first carries out error correcting code
Decoding, then carries out CRC check；Error correcting code error correction scope is no more than for error code number, reader can just be corrected：It is only continuous
The not correctable error that multiple error codes are caused, is just found by CRC schools code, and requires to retransmit.Interior integrated phase during the RFID tag
The error correcting code circuitry answered, improves ultrahigh frequency radio frequency identification (RFID) reader success rate.
Embodiment 1
High secrecy ultrahigh frequency RFID system of the invention based on distributed cipher key, including ultrahigh frequency radio frequency identification (RFID) reader and RFID
Label.The ultrahigh frequency radio frequency identification (RFID) reader includes ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip, ultrahigh frequency radio frequency identification (RFID) reader SoC
Chip, a kind of authentication accessing internet of things application system background server method and a kind of dynamic encryption read stamp methods；It is described
RFID tag is integrated with corresponding error correcting code circuitry.
Further, the ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip is in the transmitter architecture using Direct conversion
And on the basis of the quadrature receiver architecture of zero intermediate frequency, be integrated with the power amplifier that transmission power is 20dBm, realize mark
The remote reading of label.
Further, the ultrahigh frequency radio frequency identification (RFID) reader using the passive frequency mixer of high linearity and low noise as before radio frequency
End, efficiently solves the carrier wave leakage problem of emitter, substantially increases the sensitivity of read write line.
Further, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with the power amplification that transmission power is 25dBm
Device, the need for meeting portability and reading distance, reduces BOM costs.
Further, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with electronics error correcting code coding and decoding circuit, reads
Device is write when writing the data of RFID tag, all data are generated into ECC error correction by the error correction circuit in read write line chip
Code, and (due to RFID tag memory space enough, this mode simultaneously need not additionally increase in write-in RFID tag together
The memory capacity of RFID tag).When reading label, then label data and ECC are read back together, reader first carries out error correction
Code decoding, then carries out CRC check.Error correcting code error correction scope is no more than for error code number, read write line can just be corrected.Solve
Using label cost increase problem caused by Error-Control Coding.
Fig. 2 is the workflow diagram that the ultrahigh frequency radio frequency identification (RFID) reader reads RFID tag data.Label data is first passed through
CRC circuit adds check code, is sent back after then carrying out error correcting code circuitry coding in read write line (to no error correcting code circuitry
Label, directly transmit the error correction encoded data of memory block memory storage), send back read write line data include protocol integrated test system
(Protocol Control, PC) data, EPC, CRC and extra increased ECC.Reader first carries out ECC decoding
Processing, to correct the data that some are wrong, then carries out CRC check verification PC+EPC codes, confirms whether data are correct.
Further, ultrahigh frequency radio frequency identification (RFID) reader one kind authentication accessing internet of things application system database method, builds
Vertical read write line multi-stage authentication access mechanism, for the user of different stage, opens the database-access rights of different details, effectively
Ground prevents sensitive information from leaking.Specific embodiment adds as shown in figure 3, being added in read write line in OTP modules, OTP modules
Enter unique number of read write line, background data base carries out grading authorized access for unique number according to read write line to each read write line.Read write line
After label data read-write is completed, set up and communicated to connect by network and background server, then read with read write line OTP
, by after public key encryption OTP coded datas formation authentication data send jointly to backstage read write line Verification System, after
After platform read write line certification decrypts data by private key, it is compared with the database mandate read write line list where label, with
Confirm whether read write line is in the scope of authority, if unauthorized read write line, then can not obtain the institute belonging to the label in data
There is content；If authorizing read write line, then the inquiry of corresponding contents can be completed, so as to effectively realize the system mirror of read write line
Power.
Further, the ultrahigh frequency radio frequency identification (RFID) reader employs dynamic encrypting method when reading label, effectively prevents
Label is by extensive " clone ".As shown in figure 4, specific implementation process is, read write line is when reading label, while reading in label
Label data content and dynamic symmetry password, the two data are then sent to background server together.Dynamic symmetry is close
Code will be compared with the authentication password on background server, if unanimously, server sends the response to read write line.Confirm to read
Write as after work(, read write line produces one group of new dynamic password and write simultaneously in label and background server, to password progress pair
Dynamic is claimed to update.At this moment, will even in some time due to the dynamic symmetry password that can not possibly upgrade in time if clone's label
Data in label replicate clone completely, but due to the dynamic symmetry password that can not be upgraded in time with background server, therefore, it is possible to
Easily just it is recognized by the system as illegal label, so as to effectively prevent that label from being cloned on a large scale.
Further, interior integrated corresponding error correcting code circuitry during the RFID tag.As shown in figure 5, specific implement
Process is that label first passes through CRC circuit to data plus check code, then carries out Error Correction of Coding transmission.Reader is first entangled
Error code is decoded, and then carries out CRC check.Error correcting code error correction scope is no more than for error code number, reader can just be corrected：Only
The not correctable error that continuous multiple error codes are caused, is just found by CRC schools code, and requires to retransmit.So it is greatly lowered reading
Write device requirement label and resend the probability of data, so as to improve the read-write efficiency of read write line, reduce read false rate.
Claims (8)
1. a kind of high secrecy ultrahigh frequency RFID system perceived suitable for ITS Information, it is characterised in that the system is based on
Distributed cipher key, including server, ultrahigh frequency radio frequency identification (RFID) reader and RFID tag,
The ultrahigh frequency radio frequency identification (RFID) reader includes ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip, ultrahigh frequency radio frequency identification (RFID) reader SoC
Chip, using the authentication mechanism for encrypting for unique number of OTP in ultrahigh frequency radio frequency identification (RFID) reader, realizes that ultrahigh frequency radio frequency identification (RFID) reader reflects
Power accesses background server/database, and the ultrahigh frequency radio frequency identification (RFID) reader reads stamp methods using dynamic encryption, close by dynamic
Code realizes the anti-clone of label；The RFID tag is integrated with corresponding error correcting code circuitry.
2. the high secrecy ultrahigh frequency RFID system according to claim 1 perceived suitable for ITS Information, its feature
It is, the ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip is integrated with the power amplifier that transmission power is 20dBm.
3. the high secrecy ultrahigh frequency RFID system according to claim 1 perceived suitable for ITS Information, its feature
It is, the ultrahigh frequency radio frequency identification (RFID) reader analog front-end chip is integrated with passive frequency mixer.
4. the high secrecy ultrahigh frequency RFID system according to claim 1 perceived suitable for ITS Information, its feature
It is, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with the power amplifier that transmission power is 25dBm.
5. the high secrecy ultrahigh frequency RFID system according to claim 1 perceived suitable for ITS Information, its feature
It is, the ultrahigh frequency radio frequency identification (RFID) reader SoC chip is integrated with electronics error correcting code coding and decoding circuit, specific as follows：
Read write line is generated all data by the error correction circuit in read write line chip when writing the data of RFID tag
ECC, and together in write-in RFID tag；When reading label, then label data and ECC are read back together, read
Device first carries out error correcting code decoding, then carries out CRC check；Error correcting code error correction scope is no more than for error code number, reader can
To correct.
6. the high secrecy ultrahigh frequency RFID system according to claim 1 perceived suitable for ITS Information, its feature
It is, the authentication mechanism for encrypting using for unique number of OTP in ultrahigh frequency radio frequency identification (RFID) reader, realizes that ultrahigh frequency RFID is read and write
Device authentication accesses background server/database, specific as follows：
Added in read write line and unique number of read write line is added in OTP modules, OTP modules, background data base is unique according to read write line
Number to each read write line carry out grading authorized access；Read write line passes through network and background service after label data read-write is completed
Device sets up communication connection, then read with read write line OTP, recognizing by the OTP coded datas formation after public key encryption
Card data send jointly to backstage read write line Verification System, after backstage read write line certification decrypts data by private key, with label
The database mandate read write line list at place is compared, to confirm whether read write line is in the scope of authority, if unauthorized
Read write line, then can not obtain all the elements belonging to the label in data；If authorizing read write line, then corresponding contents are completed
Inquiry, so as to realize the system authentication of read write line.
7. the high secrecy ultrahigh frequency RFID system according to claim 1 perceived suitable for ITS Information, its feature
It is, the described ultrahigh frequency radio frequency identification (RFID) reader reads stamp methods using dynamic encryption, anti-gram of label is realized by dynamic password
It is grand, it is specific as follows：
Read write line is when reading label, while reading the label data content and dynamic symmetry password in label, then together will
The two data are sent to background server；Dynamic symmetry password will be compared with the authentication password on background server, such as
Fruit is consistent, then server sends the response to read write line；After confirmation is read and write successfully, read write line produces one group of new dynamic password and same
When write-in label and background server in, to password carry out symmetric dynamic renewal；At this moment if clone label, due to can not and
Data in label are replicated clone by Shi Gengxin dynamic symmetry passwords completely even in some time, but due to can not be with backstage
Server upgrades in time dynamic symmetry password, therefore, it is possible to be recognized by the system as illegal label, so as to prevent label to be cloned.
8. the high secrecy ultrahigh frequency RFID system according to claim 1 perceived suitable for ITS Information, its feature
It is, interior integrated corresponding error correcting code circuitry, specific as follows during the RFID tag：
The integrated corresponding error correcting code circuitry in RFID tag, reader then integrated corresponding error decoding circuit or software；
Label first passes through CRC circuit to data plus check code, then carries out Error Correction of Coding transmission；Reader first carries out error correcting code solution
Code, then carries out CRC check；Error correcting code error correction scope is no more than for error code number, reader can just be corrected：It is only continuous many
The not correctable error that individual error code is caused, is just found by CRC schools code, and requires to retransmit.
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| CN201611262998.8A CN107045643A (en) | 2016-12-30 | 2016-12-30 | The high secrecy ultrahigh frequency RFID system perceived suitable for ITS Information |
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| CN201611262998.8A CN107045643A (en) | 2016-12-30 | 2016-12-30 | The high secrecy ultrahigh frequency RFID system perceived suitable for ITS Information |
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Family
ID=59543878
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110245730A (en) * | 2019-05-24 | 2019-09-17 | 国网河北省电力有限公司衡水供电分公司 | A method of goods and materials are managed based on dynamic coding |
| CN110807505A (en) * | 2019-11-18 | 2020-02-18 | 智坤(浙江)半导体有限公司 | Ultrahigh frequency RFID (radio frequency identification) tag, reading device and system |
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| CN103226685A (en) * | 2013-05-10 | 2013-07-31 | 智坤（江苏）半导体有限公司 | Method for improving radio frequency identification (RFID) tag reading success rate |
| CN103793742A (en) * | 2013-05-10 | 2014-05-14 | 陈昊 | Technology of electronic tag safety authentication and information encryption of traffic electronic license plate |
| CN103854042A (en) * | 2014-03-14 | 2014-06-11 | 智坤（江苏）半导体有限公司 | RFID label reader-writer authentication and label anti-cloning method |
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| CN102222260A (en) * | 2011-06-29 | 2011-10-19 | 公安部第三研究所 | Passive ultra-high frequency radio frequency identification (RFID) electronic tag chip special for vehicle and control method |
| CN103226685A (en) * | 2013-05-10 | 2013-07-31 | 智坤（江苏）半导体有限公司 | Method for improving radio frequency identification (RFID) tag reading success rate |
| CN103793742A (en) * | 2013-05-10 | 2014-05-14 | 陈昊 | Technology of electronic tag safety authentication and information encryption of traffic electronic license plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110245730A (en) * | 2019-05-24 | 2019-09-17 | 国网河北省电力有限公司衡水供电分公司 | A method of goods and materials are managed based on dynamic coding |
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