CN107229962A - A kind of universal smart card based on mobile terminal - Google Patents
A kind of universal smart card based on mobile terminal Download PDFInfo
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- CN107229962A CN107229962A CN201710532757.9A CN201710532757A CN107229962A CN 107229962 A CN107229962 A CN 107229962A CN 201710532757 A CN201710532757 A CN 201710532757A CN 107229962 A CN107229962 A CN 107229962A
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- 230000015654 memory Effects 0.000 claims abstract description 30
- 230000006870 function Effects 0.000 claims abstract description 26
- 239000000470 constituent Substances 0.000 claims abstract description 6
- 230000003993 interaction Effects 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000013475 authorization Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000005039 memory span Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of universal smart card based on mobile terminal, including NFC processors, memory, digital baseband circuit, radio circuit and security module, the security module is used to enter line command between the NFC processors and data are interacted, and safe encryption is carried out to data, NFC processors are interacted by carrying out secure data between digital baseband, radio frequency unit, antenna and card reader, complete authentication and payment function；Wherein, the payment system file relevant with paying application is loaded with NFC processors, the system file is in a kind of tree structure that can be accessed by bibliographic structure, the root node of tree structure is the master file of description payment system environment and the constituent instruments of description payment system environment indices, root node inferior division is the various user profile and control information file that branch into the means of payment under the catalogue file of multiple means of payment, the catalogue file of each means of payment.The present invention can realize one card for multiple uses.
Description
Technical field
The present invention relates to smart card techniques, more particularly to a kind of universal smart card based on mobile terminal.
Background technology
With convenience is taken because smart card has, using the simple, characteristic such as flexible, therefore in finance, telecommunications, public thing safely
The industries such as industry, medical treatment are widely applied, and are very easy to daily life.All trades and professions are in order to improve competition
Power, all issues various exclusive smart cards, the lasting Final of this situation cause user to hold substantial amounts of card, to card pipe one after another
Reason is chaotic, seriously hinders the popularization of smart card.
On the other hand, opened rapidly as the mobile payment market relied on using intelligent terminal and mobile network.Near-field communication is made
For a kind of new wireless communication technology, more conform to for intelligent requirements very high today, and with low cost, conveniently
The features such as easy-to-use, richer intuitive.Near-field communication (Near Field Communication, NFC), also known as near radio lead to
Letter, is a kind of short-range high frequency wireless communication technology, it is allowed to contactless Point-to-Point Data Transmission is carried out between electronic equipment
(in ten centimetres) exchange data.This technology is developed by contact-free formula RF identification (RFID), and backward compatible RFID,
Each succeeded in developing by Sony and Philips earliest, be mainly used in the handheld devices such as mobile phone providing M2M (Machine to
Machine communication).Because near-field communication has natural security, therefore, NFC technique is considered as leading in mobile-phone payment etc.
Domain has great application prospect.NFC chip is that have to be in communication with each other function, and with computing capability, in Felica standards
Also contain encryption logic, MIFARE later stage standard has also added encrypting-decrypting module (SAM).The compatible rope of NFC standard
The FeliCaTM standards of Buddhist nun company, and ISO 14443 A, B, that is, use the MIFARE standards of Philip.It is in the industry cycle simple
Referred to as TypeA, TypeB and TypeF, wherein A, B are Mifare standards, and F is Felica standards.
The content of the invention
Goal of the invention：There is provided a kind of universal intelligent based on mobile terminal for the problem of present invention exists for prior art
Card, it is hand-held that the smart card with difference in functionality that can issue different industries concentrates on the few users of , Yi Minus on a nfc card piece
Number of cards, facilitate user management and routine use.
Technical scheme：Universal smart card of the present invention based on mobile terminal, including NFC processors, memory, number
Word baseband circuit, radio circuit and security module, the NFC processors, digital baseband circuit and radio circuit are sequentially connected, institute
State memory and security module and connect the NFC processors respectively, the radio circuit connects the antenna of mobile terminal；The peace
Full module is used to enter line command between the NFC processors and data are interacted, and carries out safe encryption, NFC processing to data
Device is interacted by carrying out secure data between digital baseband, radio frequency unit, antenna and card reader, is completed authentication and is paid work(
Energy；Wherein, the payment system file relevant with paying application is loaded with NFC processors, the system file can pass through in one kind
The tree structure that bibliographic structure is accessed, the root node of tree structure is that the master file of description payment system environment and description pay system
The constituent instruments for environment indices of uniting, root node inferior division is the catalogue file of multiple means of payment, the catalogue of each means of payment
Various user profile and control information file are branched under file.Various user profile and control information the File bag
Include file control information file, cardholder information file, transaction record file and remaining sum log file bag in catalogue file
Include file control information file, cardholder information file, transaction record file and remaining sum of the means of payment in catalogue file
Log file.
Further, the card reader is also connected with background server and carries out data interaction, complete data upload or after
Platform authentication function.
Wherein, the security module can be selected as encryption chip, the NFC processors, memory, digital baseband electricity
Road, radio circuit and security module are mounted in mobile terminal, and the operating system of the universal smart card is carried in NFC processing
On device.
The security module can also be the security module realized using the software of mobile terminal, by the processing of mobile terminal
Device control operation, the processor of mobile terminal, security module and NFC processors two are two interconnected, NFC processors, memory,
Digital baseband circuit, radio circuit and security module are mounted in mobile terminal.The operating system of the universal smart card adds
It is loaded on NFC processors or on the processor of mobile terminal.The memory is the memory or NFC specific stores of mobile terminal
Device.
The security module can also be arranged on remote security service device, NFC processors, memory, digital baseband electricity
Road and radio circuit are mounted in mobile terminal, and the processor of mobile terminal, security module are mutually interconnected two-by-two with NFC processors
Connect.The operating system of the universal smart card is carried on NFC processors.
Beneficial effect：Compared with prior art, its remarkable advantage is the present invention：
1st, the universal smart card proposed by the present invention based on mobile terminal, has difference in functionality by what different industries were issued
Smart card concentrates on the hand-held number of cards of the few users of , Yi Minus on a nfc card piece, facilitates user management and routine use.
2nd, smart card simulation is considered as in NFC technique the most field of prospect, and the prospect of profit is most reliable.Therefore by user
It is a reality and urgent requirement to hold function (smart card/non-contact tag) to add in mobile phone, will greatly promote NFC intelligence
The use of mobile phone and profit potential.
3rd, the present invention proposes pure hardware, three kinds of universal smart card operational modes based on software realization and telesecurity, pole
The earth facilitates the application of the manufacturer, service provider of different technologies level so that high-end manufacturer/operator/service provider can be with
Production, operation, using the hardware based universal smart card system of highest safe class, manufacturer/operators of other levels/
Service provider can produce, run, using secondary one-level safe class based on software or online universal smart card system.This office
Face will be greatly facilitated the use of NFC smart mobile phones, facilitate different smart card issuance departments.Under latter two pattern, Ren Hekai
Originator can develop based on software or online universal intelligent card application, have fixed read write line with existing for exploitation
Infrastructure interaction application program provide may.That is, developer can develop the gate inhibition based on mobile phone, branch
Pay, public transport and ticketing service application program, in the system using RFID ticket cards and smart card.Generally speaking, based on software
Or online universal smart card be general developer, rather than those " industry giants " can should from simple NFC label
With the fine opportunity for carrying out Function Extension.
Brief description of the drawings
Fig. 1 is the system block diagram of the one embodiment for the universal smart card based on mobile terminal that the present invention is provided；
Fig. 2 is the tree structure schematic diagram for the payment system file that the present invention is provided；
Fig. 3 is the system block diagram of the another embodiment for the universal smart card based on mobile terminal that the present invention is provided；
Fig. 4 is the system block diagram of the another embodiment for the universal smart card based on mobile terminal that the present invention is provided.
Embodiment
Embodiment 1
A kind of universal smart card based on mobile terminal is present embodiments provided, as shown in figure 1, universal smart card is all adopted
Realized with hardware, including NFC processors, memory, digital baseband circuit, radio circuit and security module, NFC processors, number
Word baseband circuit and radio circuit are sequentially connected, and memory and security module connect NFC processors respectively, and radio circuit connection is moved
The antenna of dynamic terminal, security module is specially encryption chip, NFC processors, memory, digital baseband circuit, radio circuit and
Security module is mounted in mobile terminal.Security module is used to enter line command between NFC processors and data are interacted, and right
Data carry out safe encryption, and NFC processors are by carrying out secure data between digital baseband, radio frequency unit, antenna and card reader
Interaction, completes authentication and payment function；Card reader is connected with background server and carries out data interaction, completes data and uploads
Or background authentication function.
The operating system of universal smart card is carried on NFC processors, the operating system meet ISO7816 series standards and
《China's finance integrated circuit (IC) calliper model》.The operating system is by transfer management, file management, security system, command interpretation
Four software function module compositions.Wherein, transfer management software module by ISO7816-3, ISO14443-4 standard supervision card with
Communication between terminal, it is ensured that data are correctly transmitted, prevents that communication data is illegally stolen and distorted between card and terminal；Text
Part managing software module stores user data in memory with document form, it is ensured that rapidity and data peace when accessing file
Quan Xing；Security system software module it be related to the discriminating and verification of card, mechanism of authorization control during to file access；Order solution
Release software module and check whether parameters are correct according to the order received, perform corresponding operation.
The payment system file relevant with paying application is also loaded with NFC processors, the system file can lead in one kind
The tree structure of bibliographic structure access is crossed, as shown in Fig. 2 master file of the root node of tree structure for description payment system environment
With the constituent instruments of description payment system environment indices, master file is uniquely present in NFC processors, and root node inferior division is many
The catalogue file of the individual means of payment, the means of payment includes electronic bankbook, common reserve fund, access card, medical card, campus card, transportation card
Etc., the branch under the catalogue file of each means of payment includes file control information text of the means of payment in catalogue file
Part, cardholder information file, transaction record file and remaining sum log file etc..Payment system application can be with universal smart card
By clearly selecting payment system environment to activate, a successful payment system environmental selection can be visited bibliographic structure
Ask.
The different application card creation method of the smart card, is to utilize mobile terminal (such as mobile phone, tablet personal computer etc.) user
After authentication is carried out, download the special APP softwares of different hair fastener departments by application for registration to realize.It is different creating
Application card when, mobile phone application processor accesses NFC processors and security module, carries out the establishment of different application smart cards,
Now, the payment function of whole universal smart card is (see the Fig. 3) shielded
In the present embodiment, in order to realize that the memory span in hardware-type universal smart card, NFC module is as big as possible,
The disposal ability of NFC processors is as strong as possible.
Embodiment 2
Another universal smart card based on mobile terminal is present embodiments provided, as shown in figure 4, including NFC processing
Device, memory, digital baseband circuit, radio circuit and security module, NFC processors, digital baseband circuit and radio circuit according to
Secondary connection, memory and security module connect NFC processors respectively, and radio circuit connects the antenna of mobile terminal, NFC processing
Device, memory, digital baseband circuit, radio circuit are mounted in mobile terminal.Security module is used between NFC processors
Enter line command and data interaction, and data carried out with safe encryption, NFC processors by digital baseband, radio frequency unit, antenna with
Secure data interaction is carried out between card reader, authentication and payment function is completed；Card reader is connected with background server and gone forward side by side
Row data interaction, completes data and uploads or background authentication function.Security module is specially to be realized using the software of mobile terminal
Security module, by the processor control operation of mobile terminal, processor, security module and the NFC processors of mobile terminal are two-by-two
It is connected with each other, memory is the memory or NFC private memories of mobile terminal.
The operating system of universal smart card is carried on NFC processors or on the processor of mobile terminal, works as operating system
During with store function all using the original module of smart mobile phone, the disposal ability of memory span and processor in NFC module
Can accordingly it reduce.Operating system meet ISO7816 series standards and《China's finance integrated circuit (IC) calliper model》.The operation
System is made up of transfer management, file management, security system, four software function modules of command interpretation.Wherein, transfer management is soft
Part module is by the communication between ISO7816-3, ISO14443-4 standard supervision card and terminal, it is ensured that data are correctly transmitted, and prevents
Only communication data is illegally stolen and distorted between card and terminal；File manager software module deposits user data with document form
Storage is in memory, it is ensured that rapidity and Information Security when accessing file；Security system software module it be related to the mirror of card
Not with verification, mechanism of authorization control during to file access；Command interpretation software module checks every according to the order received
Whether parameter is correct, performs corresponding operation.
The payment system file relevant with paying application is also loaded with NFC processors, the system file can lead in one kind
The tree structure of bibliographic structure access is crossed, as shown in Fig. 2 master file of the root node of tree structure for description payment system environment
With the constituent instruments of description payment system environment indices, root node inferior division is the catalogue file of multiple means of payment, payer
Formula includes electronic bankbook, common reserve fund, access card, medical card, campus card, transportation card etc., the catalogue file of each means of payment
Under branch include the means of payment file control information file, cardholder information file, transaction record in catalogue file
File and remaining sum log file etc..In universal smart card payment system application can by clearly select payment system environment come
Activation, a successful payment system environmental selection can conduct interviews to bibliographic structure.
Different application program for mobile terminal are called to meet the intelligence of ISO/IEC 14443-4 standards with comprehensive simulation
It can block, including type A and type B.Application program for mobile terminal can specify static attribute (such as unique ID of analog card
(UID) and ISO/IEC 14443Type A cards historical data), and in block exchange agreement as defined in ISO/IEC14443-4
On the basis of carry out message protocol data unit exchange.Application program simulation smart card method can be：Can be by mobile whole
End directly access background system, which is registered, is modeled as application program for mobile terminal different smart cards.When from external reader
When obtaining order, mobile terminal notifies the simulation application program of intelligent card by a call back function, and obtained order is made
The call back function is passed to for parameter.Simulation application program of intelligent card can accordingly be handled by parameter, the readjustment letter
Several return values may return to read write line.
The present embodiment is to realize that the application in the security module function in NFC, such NFC mobile phone can nothing using software
Hardware security module is needed just to be interacted with existing RFID smart card reading and writing device system, so as to realize the general intelligence based on software
Can card.The technology is that numerous developers open the gate for realizing card analog functuion, is tightly controlled before the function,
This will increase the scope that NFC technique is used, so as to cause the increase to NFC device demand, and promote NFC to turn into one really
Extensive application technology.This method makes complexity, and intelligent card function under tight control becomes simpler
And opening.By this method, developer can bypass security module (generally being controlled by " industry giants "), to realize innovation
Property NFC apply provide chance.But at the same time, the security of this method is than the peace based on the universal smart card for depositing pure hardware
Full property reduction, is applicable to the not high application of security level required.Or security is improved using other method.
Embodiment 3
Present embodiments provide another universal smart card based on mobile terminal, as shown in figure 4, including NFC processors,
Memory, digital baseband circuit, radio circuit and security module, NFC processors, digital baseband circuit and radio circuit connect successively
Connect, memory and security module connect NFC processors respectively, radio circuit connects the antenna of mobile terminal, NFC processors, deposit
Reservoir, digital baseband circuit, radio circuit are mounted in mobile terminal.Security module is arranged on remote security service device,
The processor of mobile terminal, security module and NFC processors two are two interconnected.Security module is used between NFC processors
Enter line command and data interaction, and data carried out with safe encryption, NFC processors by digital baseband, radio frequency unit, antenna with
Secure data interaction is carried out between card reader, authentication and payment function is completed；Card reader is connected with background server and gone forward side by side
Row data interaction, completes data and uploads or background authentication function.
The operating system of universal smart card is carried on NFC processors or on the processor of mobile terminal, operating system symbol
Close ISO7816 series standards and《China's finance integrated circuit (IC) calliper model》.The operating system is by transfer management, file pipe
Reason, security system, four software function module compositions of command interpretation.Wherein, transfer management software module by ISO7816-3,
Communication between ISO14443-4 standard supervisions card and terminal, it is ensured that data are correctly transmitted, prevents from communicating between card and terminal
Data are illegally stolen and distorted；File manager software module stores user data in memory with document form, it is ensured that
Rapidity and Information Security when accessing file；It is related to the discriminating and verification of card to security system software module, and file is visited
Mechanism of authorization control when asking；Command interpretation software module checks whether parameters are correct according to the order received, performs
Corresponding operation.
The payment system file relevant with paying application is also loaded with NFC processors, the system file can lead in one kind
The tree structure of bibliographic structure access is crossed, as shown in Fig. 2 master file of the root node of tree structure for description payment system environment
With the constituent instruments of description payment system environment indices, root node inferior division is the catalogue file of multiple means of payment, payer
Formula includes electronic bankbook, common reserve fund, access card, medical card, campus card, transportation card etc., the catalogue file of each means of payment
Under branch include the means of payment file control information file, cardholder information file, transaction record in catalogue file
File and remaining sum log file etc..In universal smart card payment system application can by clearly select payment system environment come
Activation, a successful payment system environmental selection can conduct interviews to bibliographic structure.
Call different application programs to meet the smart card of ISO/IEC 14443-4 standards with comprehensive simulation, wrap
Include type A and type B.Application program can specify static attribute (such as unique ID (UID) and the ISO/ of analog card
The historical data of IEC14443Type A cards), and enter row information on the basis of block exchange agreement as defined in ISO/IEC14443-4
Protocol Data Unit is exchanged.Application program simulation smart card method can be：Backstage can directly be accessed by mobile terminal
System, which is registered, is modeled as application program for mobile terminal different smart cards.When obtaining order from external reader, move
Dynamic terminal notifies the simulation application program of intelligent card by a call back function, and obtained order is passed into this as parameter
Call back function.Simulation application program of intelligent card can accordingly be handled by parameter, and the return value of the call back function can be with
Return to read write line.
In addition to NFC mobile phone, miscellaneous equipment, such as NFC reader can also realize universal smart card according to the present invention
System, it can in addition contain design and produce special universal smart card analog machine according to invention.
Above disclosed is only a kind of preferred embodiment of the invention, it is impossible to the right model of the present invention is limited with this
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (10)
1. a kind of universal smart card based on mobile terminal, it is characterised in that：Including NFC processors, memory, digital baseband electricity
Road, radio circuit and security module, the NFC processors, digital baseband circuit and radio circuit are sequentially connected, the memory
Connect the NFC processors respectively with security module, the radio circuit connects the antenna of mobile terminal；The security module is used
In entering line command between the NFC processors and data are interacted, and safe encryption is carried out to data, NFC processors pass through number
Secure data is carried out between word base band, radio frequency unit, antenna and card reader to interact, and completes authentication and payment function；
Wherein, the payment system file relevant with paying application is loaded with NFC processors, the system file can pass through in one kind
The tree structure that bibliographic structure is accessed, the root node of tree structure is that the master file of description payment system environment and description pay system
The constituent instruments for environment indices of uniting, root node inferior division is the catalogue file of multiple means of payment, the catalogue of each means of payment
The various user profile and control information file that branch into the means of payment under file.
2. the universal smart card according to claim 1 based on mobile terminal, it is characterised in that：The various user profile
It is included in file control information file, cardholder information file, transaction record in catalogue file with control information File
File and remaining sum log file.
3. the universal smart card according to claim 1 based on mobile terminal, it is characterised in that：The card reader also with it is rear
Platform server connects and carries out data interaction, completes data and uploads or background authentication function.
4. the universal smart card according to claim 1 based on mobile terminal, it is characterised in that：The security module is specific
For encryption chip, the NFC processors, memory, digital baseband circuit, radio circuit and security module are mounted on mobile whole
In end.
5. the universal smart card according to claim 4 based on mobile terminal, it is characterised in that：The universal smart card
Operating system is carried on NFC processors.
6. the universal smart card according to claim 1 based on mobile terminal, it is characterised in that：The security module is specific
The security module realized for the software for utilizing mobile terminal, by the processor control operation of mobile terminal, the processing of mobile terminal
Device, security module and NFC processors two are two interconnected, NFC processors, memory, digital baseband circuit, radio circuit and peace
Full module is mounted in mobile terminal.
7. the universal smart card according to claim 6 based on mobile terminal, it is characterised in that：The universal smart card
Operating system is carried on NFC processors or on the processor of mobile terminal.
8. the universal smart card according to claim 6 based on mobile terminal, it is characterised in that：The memory is movement
The memory or NFC private memories of terminal.
9. the universal smart card according to claim 1 based on mobile terminal, it is characterised in that：The security module is set
In on remote security service device, NFC processors, memory, digital baseband circuit and radio circuit are mounted in mobile terminal,
The processor of mobile terminal, security module and NFC processors two are two interconnected.
10. the universal smart card according to claim 9 based on mobile terminal, it is characterised in that：The universal smart card
Operating system be carried on NFC processors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532757.9A CN107229962A (en) | 2017-07-03 | 2017-07-03 | A kind of universal smart card based on mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710532757.9A CN107229962A (en) | 2017-07-03 | 2017-07-03 | A kind of universal smart card based on mobile terminal |
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| CN107229962A true CN107229962A (en) | 2017-10-03 |
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| CN201710532757.9A Pending CN107229962A (en) | 2017-07-03 | 2017-07-03 | A kind of universal smart card based on mobile terminal |
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| CN110428561A (en) * | 2019-09-06 | 2019-11-08 | 中国工商银行股份有限公司 | A kind of separate type gathering probe, device and method |
| RU2746305C1 (en) * | 2018-02-01 | 2021-04-12 | Хуавей Текнолоджиз Ко., Лтд. | Memory card and terminal device |
| CN113496264A (en) * | 2021-06-23 | 2021-10-12 | 中国人民解放军总医院第一医学中心 | Communication system based on RFID injury card |
| CN116170794A (en) * | 2023-04-25 | 2023-05-26 | 深圳市微付充科技有限公司 | Online idle issuing system and method for smart card |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2746305C1 (en) * | 2018-02-01 | 2021-04-12 | Хуавей Текнолоджиз Ко., Лтд. | Memory card and terminal device |
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Application publication date: 20171003 |