CN103905196B - A kind of PIN turns encryption method - Google Patents
A kind of PIN turns encryption method Download PDFInfo
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- CN103905196B CN103905196B CN201210583757.9A CN201210583757A CN103905196B CN 103905196 B CN103905196 B CN 103905196B CN 201210583757 A CN201210583757 A CN 201210583757A CN 103905196 B CN103905196 B CN 103905196B
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Abstract
Turn encryption method the invention discloses a kind of PIN, mobile terminal SIM is encrypted generation PIN ciphertexts to account PIN code first, and PIN ciphertexts are sent to OTA servers, and PIN ciphertexts are carried out by OTA server calls encryption equipment turning encryption afterwards, obtain the new PIN ciphertexts of financial institution's requirement；When payment transaction is moved, the new PIN ciphertexts that financial institution receives are decrypted and obtain user's PIN code, it is whether correct with the whether consistent PIN code to verify user input of user's PIN code of financial institution backstage preservation by comparing user's PIN code for obtaining of decryption.PIN in the present invention turns encryption method and instead of code keypad, the encryption process for completing individual subscriber PIN of safety.The method dynamically generates PIN working keys, and the maximized safety that ensure that PIN code improves the security of the finance account of terminal user.
Description
Technical field
The present invention relates to the PIN security technology areas in mobile-payment system, and in particular in a kind of mobile-payment system
PIN turn encryption method.
Background technology
In recent years, mobile payment industry development is rapid, and mobile payment is turning into a kind of emerging, easily payer
Formula, operator, city one-card, Third-party payment platform and each big bank all actively pushing forward advancing for mobile payment,
Also has there are various mobile payment products and corresponding mobile payment software systems in the market, but safety is always that mobile payment is produced
The most concerned problem in crowd side is respectively related in industry chain, the mobile payment product by means of/credit function is based especially on, how maximized guarantor
The safety of the finance account of user is protected, into the most important thing of Liao Ge banks propulsion mobile payment work.
It is mostly close by arranging with terminal using credit card issuer at present in the mobile-payment system that bank dominates completion is built
The mode of key is completed, and protects the safety of PIN code, terminal to be responsible for encryption by symmetrical encryption and decryption technology, and credit card issuer is decrypted school
Test.This kind of method there is also some drawbacks ensure that the safety of PIN to a certain degree simultaneously：
1）The key of agreement has quantity to limit and key does not have dynamic formation characteristic；
2）Banking system need to be directed to mobile payment correlation function increases special PIN verifying functions, it is desirable to have improvement cost.
The content of the invention
For defect present in prior art, turn encryption method it is an object of the invention to provide a kind of PIN, by this
Method put forward the security of PIN code.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of PIN turns encryption method, comprises the following steps：
（1）Mobile terminal SIM is encrypted generation PIN ciphertexts to account PIN code, and is saved in SIM；Described
Account PIN code refers to the PIN of the user's financial IC card provided by financial institution；
（2）PIN ciphertexts are sent to OTA servers by mobile terminal, and OTA server calls its encryption equipments enters to PIN ciphertexts
Row turns encryption, generates new PIN ciphertexts, and be sent to financial institution server.
Further, a kind of PIN as described above turns encryption method, step（1）In, mobile terminal SIM is to account PIN code
Be encrypted generation PIN ciphertexts concrete mode be：
（1-1）Individual subscriber master key is obtained, dispersion factor is generated；Described individual subscriber master key is by financial institution
In previously generating and writing financial IC card；
（1-2）Individual subscriber master key is disperseed using dispersion factor, generating process key；
（1-3）Generation PIN ciphertexts are encrypted to account PIN code using process key.
Further, a kind of PIN as described above turns encryption method, described individual subscriber master key be financial institution to
When financial IC card is provided at family, the user's master key in financial institution server is divided the card Application Serial Number of financial IC card
Dissipate what is obtained；User's master key is the hair fastener key that financial institution provides financial IC card, and the key is logged in OTA servers simultaneously
In encryption equipment；Card Application Serial Number is the card number of financial IC card.
Further, a kind of PIN as described above turns encryption method, step（1-1）In, the byte long of described dispersion factor
It is 8 bytes to spend, and is constituted by random number and using transaction count；If random number and application transaction count are less than 8 bytes, most right
The bytes of 0x80 to 8 are mended at end, if still less than 8 bytes, continuing to fill up the bytes of 0x00 to 8.
Further, a kind of PIN as described above turns encryption method, step（2）In, be sent to for PIN ciphertexts by mobile terminal
During OTA servers, while card Application Serial Number, dispersion factor are sent into OTA servers.
Further, a kind of PIN as described above turns encryption method, and described OTA servers timing is to financial institution services
Device is registered, and financial institution server returns to PIK ciphertexts to OTA servers when registering；Described PIK ciphertexts are by financial machine
Structure server encrypts what is obtained using key-encrypting key KEK to key PIK；Key PIK is financial institution server distribution
Key for encrypting account PIN code；Key-encrypting key KEK is financial institution server distribution for protecting key PIK
Key；
Further, a kind of PIN as described above turns encryption method, step（2）In, OTA server calls its encryption equipments pair
PIN ciphertexts carry out turning encryption, and the concrete mode for obtaining new PIN ciphertexts is：
（2-1）The timing of OTA servers is registered to financial institution server, and financial institution server is returned to OTA servers
PIK ciphertexts；
（2-2）PIN ciphertexts that OTA servers will send on mobile terminal SIM, card Application Serial Number, dispersion factor and
PIK ciphertexts obtained by registering are sent to encryption equipment；
（2-3）Encryption equipment is disperseed using card Application Serial Number user's master key built-in to its, obtains user
People's master key；
（2-4）Individual subscriber master key is disperseed using dispersion factor, generating process key；
（2-5）PIN ciphertexts are decrypted using process key obtains account PIN code；
（2-6）PIK ciphertexts are decrypted using KEK and obtain key PIK, account PIN code is encrypted using key PIK obtains new
PIN ciphertexts.
Further, a kind of PIN as described above turns encryption method, step（1-3）In, using process key to account PIN
Before code encryption, PINBLOCK is generated according to account PIN code, generation PIN ciphertexts are encrypted to PINBLOCK using process key.
Further, a kind of PIN as described above turns encryption method, step（2-6）In, using key PIK to account PIN
Before code encryption, PINBLOCK is generated according to account PIN code, generation PIN ciphertexts are encrypted to PINBLOCK using key PIK.
Further, a kind of PIN as described above turns encryption method, when being encrypted to PINBLOCK, the encryption of use
Algorithm is DES algorithms.
The beneficial effects of the present invention are：PIN of the present invention turns encryption method, instead of code keypad, safe
Complete encryption, the decrypting process of individual subscriber PIN；While the method avoids the mobile-payment system of financial institution and is directed to
The system upgrade that PIN safety problems are made, the maximized safety that ensure that PIN code.
Brief description of the drawings
Fig. 1 is the flow chart that a kind of PIN of the invention turns encryption method；
Fig. 2 is that a kind of PIN turns the detailed maps of encryption method in specific embodiment；
Fig. 3 is that mobile terminal SIM obtains the schematic diagram of PIN code ciphertext to the encryption of account PIN code in specific embodiment；
The schematic diagram that Fig. 4 turns to encrypt for OTA servers in specific embodiment to PIN；
Fig. 5 is the flow chart for turning to encrypt to PIN inside encryption equipment in specific embodiment.
Specific embodiment
With reference to Figure of description, the present invention is described in further detail with specific embodiment.
The english abbreviation in technical terms involved in the method for the present invention is explained first：
Figures 1 and 2 show that flow chart and present embodiment PIN that a kind of PIN of the invention turns encryption method turn encryption side
The detail flowchart of method, the method is comprised the following steps：
Step S11：Terminal SIM is to account PIN code encryption generation PIN ciphertexts；
User initiates to supplement with money in mobile terminal, pays, the association requests such as transfer accounts when, using OTA technologies by aerial mode
To operate binding financial institution account（Such as bank account）In fund, by funds transfer to electronic cash wallet or payment, turn
To third-party platform, in operating process, user needs the input operation amount of money and financial institution's binding account PIN code to account.The present invention
Described in account PIN code refer to user financial IC card PIN, such as bank card password.User is in mobile terminal
After input account PIN, PIN code is encrypted by mobile terminal SIM first, the PIN code ciphertext after generation encryption.Enter
The concrete mode of row encryption is as shown in Figure 3：
（1）Individual subscriber master key is obtained, dispersion factor is generated；Described individual subscriber master key is taken by financial institution
During business device is previously generated and writes financial IC card；
（2）Individual subscriber master key is disperseed using dispersion factor, generating process key；
（3）Generation PIN ciphertexts are encrypted to account PIN code using process key.
SIM is to obtain individual subscriber master key, individual subscriber master key to the precondition that account PIN code is encrypted
When being financial institution's distribution financial IC card, write in application personalization process, be by financial institution（Such as bank）'s
During user's master key card Application Serial Number dispersion in background server is obtained and writes card, to ensure every use blocked
Family individual's master key is unique.Wherein, user's master key is by financial institution（Such as bank）The encryption equipment of server is generated and protected
Deposit, card Application Serial Number is the card number of financial IC card, bank's card number of such as user, and decentralized algorithm is prior art.This
Dispersion factor is constituted by random number and using transaction count in invention, and transaction count is the registration of application transaction counter ATC, with
Transaction count increase.Random number is unpredictable number, and this guarantees the uniqueness of dispersion factor, each dispersion factor is not
Identical, the process key of generation is also just different, it is ensured that one-time pad.The byte length of dispersion factor be 8 bytes, if random number and
Using transaction count less than 8 bytes, then the bytes of 0x80 to 8 are mended in low order end, if still continuing to fill up 0x00 to 8 less than 8 bytes
Byte.
After carrying out disperseing to obtain process key to individual subscriber master key by dispersion factor, by process key to account
PIN code computations go out PIN ciphertexts, and PIN code is needed to carry out treatment generation PINBLOCK before being encrypted, and specific generating mode is pressed
According to ANSIX9.8Format specifications, PIN code AES uses DES algorithms.
Step S12：OTA server calls its encryption equipments carries out turning encryption to PIN ciphertexts, obtains new PIN ciphertexts；
The step is core procedure of the invention, and the PIN ciphertexts that the step is obtained are the PIN that financial sector can be processed directly
Ciphertext, basis is provided for follow-up financial institution is decrypted checking.
After SIM completes the encryption of account PIN code, PIN ciphertexts are carried in card upstream request message and are sent to OTA clothes
Business device, while the dispersion factor generated in the card Application Serial Number of financial IC card, step S11 is sent into OTA services simultaneously
Device, is carried out turning encryption afterwards by its encryption equipment of OTA server calls to PIN ciphertexts.Turn mode such as Fig. 4 and Fig. 5 of encryption
It is shown, comprise the following steps：
（1）The timing of OTA servers is registered to financial institution server, and financial institution receives registering for OTA servers please
After asking, PIK ciphertexts are returned to OTA servers by the server of financial institution；Described PIK ciphertexts are by the clothes of financial institution
Business device encrypts what is obtained using key-encrypting key KEK to key PIK；Key PIK is financial institution's distribution for encrypting account
The key of family PIN code；Key-encrypting key KEK is the key for protecting key PIK of financial institution's distribution；
（2）PIN ciphertexts, card Application Serial Number, dispersion factor and label that OTA servers will send on mobile terminal SIM
PIK ciphertexts to gained are sent in the encryption equipment of OTA servers；
（3）Encryption equipment is disperseed using card Application Serial Number user's master key built-in to its, obtains individual subscriber
Master key；
（4）Individual subscriber master key is disperseed using dispersion factor, generating process key；
（5）PIN ciphertexts are decrypted using process key obtains account PIN code；
（6）PIK ciphertexts are decrypted using KEK and obtain key PIK, account PIN code is encrypted using key PIK obtains new
PIN ciphertexts.
OTA servers receive the data of mobile terminal transmission（PIN ciphertexts, dispersion factor, card sequence number etc.）Afterwards, adjust
PIN code ciphertext is carried out with encryption equipment turn encryption.OTA servers have the function that timing is registered to the server of financial institution,
In theory, OTA servers can when every time turn encryption to financial institution server application PIK ciphertexts, but in practice,
Timing is registered to financial institution during OTA servers, obtains PIK ciphertexts, can typically be set one day and be obtained once, is received every time
Register after request, PIK ciphertexts can be returned to OTA servers by financial institution server.Wherein, PIK ciphertexts are by financial institution
Server generation, what is obtained is encrypted to key PIK using key-encrypting key KEK by financial institution server；Key PIK is
The key for encrypting account PIN code of financial institution's distribution.OTA servers are got PIN ciphertexts, dispersion after PIK ciphertexts
The factor, card sequence number and PIK ciphertexts are sent in its encryption equipment, as shown in figure 4, after encryption equipment receives above-mentioned data, it is first
The process key for decrypting PIN ciphertexts is first generated, PIN ciphertexts are then decrypted by process key, obtain account PIN code, afterwards
Encryption equipment is decrypted to PIK ciphertexts by its built-in key-encrypting key KEK and obtains key PIK, finally by key PIK to account
The new PIN ciphertexts that PIN code encryption generation financial institution server can be processed directly.In present embodiment, due to step S11
In account PIN code is processed into PINBLOCK first, then encrypt PINBLOCK generation PIN ciphertexts, it is corresponding, in the step
What decryption PIN ciphertexts were obtained is also PINBLOCK, as shown in Figure 5, by the PIK PIN ciphertexts new to PINBLOCK encryption generations,
And be sent in the server of financial institution.
By the treatment of step S11 and step S12, complete PIN code turns encryption, and generating financial institution can be direct
The PIN ciphertexts for the treatment of.In actual applications, user initiate to supplement with money in mobile terminal, pay, the related mobile payment transaction such as transfer accounts
During request, its account PIN code is input into mobile terminal, afterwards by step S11 and step S12 by OTA servers encryption equipment
New PIN ciphertexts of generation and after being sent to corresponding financial sector, in theory financial institution to receive the PIN for completing to turn encryption close
Wen Hou, it is possible to use the key PIK in its server obtains account PIN code to the PIN ciphertexts decryption for receiving, by the account
PIN code is compared with the account PIN code of storage in its backstage, illustrates that password authentification passes through if consistent, and user password is closed
Method, otherwise authentication failed.
The method of the present invention is a kind of method for turning encryption to PIN, encrypts to generate financial institution for example by this turn
The PIN ciphertexts that bank can directly be processed, so the treatment to financial institution's background server does not have in the present embodiment
Describe in detail, the relevant treatment carried out by financial institution is commonly referred to as what is carried out by financial institution server in the present invention
Reason, including the generation of PIK ciphertexts that OTA servers are obtained to financial institution server, and financial institution server decrypt PIN code
Comparison method of PIN etc. is stored with backstage afterwards.
The present invention turns encryption method and instead of code keypad by the PIN of mobile-payment system, and the completion for being capable of safety is used
Encryption, the decrypting process of family individual PIN, entirely turn ciphering process and are completed in encryption equipment, and the work of dynamic generation PIN protections is close
Key, maximization ensure that the safety of the finance account of terminal user.The maximized safety for protecting PIN code.Building simultaneously
During mobile-payment system, the improvement cost for PIN safety problems is saved, promoted financial IC card in mobile payment industry
Development.
The present invention is further detailed with reference to specific embodiment.
Embodiment
● provide following key information before financial institution's distribution financial IC card：
1) user's master key:11111111111111111111111111111111（For hair fastener）；
2) PIK protection keys KEK：33333333333333333333333333333333（For protecting PIK）；
3) during OTA servers application PIK ciphertexts, financial sector distributes the key PIK for encrypting PIN plaintexts：
00010203040506070001020304050607；Financial sector, to PIK encipherment protections, obtains PIK ciphertexts using KEK, and
Return to OTA servers, the PIK ciphertexts that KEK is obtained after being encrypted to key PIK：
A851A269EF9B271BA851A269EF9B271BA5173AD5；
● user account password is that account PIN code is 123456.
SIM ciphering process is as follows：
【It is known】
1) individual subscriber master key：9E90DE82745E6852FE94F6FBD7AC4BF0 (write during financial institution's hair fastener,
Card Application Serial Number dispersion by user's master key to financial IC is obtained)；
2) card Application Serial Number（IC-card number）：1122334455667788 (being write during financial institution's hair fastener)；
3) user account password and account PIN code：123456 (user inputs)；
【Calculate PIN ciphertexts】
1) dispersion factor is produced（Random number【12345678】+ apply transaction technology【1234】）：1234567812348000；
2) individual subscriber master key is disperseed by dispersion factor, draws process key：
964C8D22B3FE47037807874F2620BC74；
3) according to ANSIX9.8Format, treatment account PIN code obtains PINBLOCK in plain text：
061253DFFEDCBA98；
4) process key is encrypted in plain text to PINBLOCK, draws PIN ciphertexts：3CD2B91103BDF6F5.
● OTA server calls its encryption equipments, it is as follows that realization turns ciphering process：
【It is known】
1) PIN ciphertexts：3CD2B91103BDF6F5 (send) on mobile terminal SIM；
2) card Application Serial Number：1122334455667788 (being sent on mobile terminal SIM)；
3) dispersion factor：1234567812348000 (being sent on mobile terminal SIM)；
4) PIK ciphertexts：A851A269EF9B271BA851A269EF9B271BA5173AD5 (financial sector return)；
5) user's master key:11111111111111111111111111111111 (financial institution provide and typing OTA add
Close machine)；
6) PIK protection keys KEK：33333333333333333333333333333333 (financial institution's offer and typings
OTA encryption equipments).
【Turn computations】
1) user's master key is once disperseed using card Application Serial Number, obtains individual subscriber master key：
9E90DE82745E6852FE94F6FBD7AC4BF0；
2) individual subscriber master key carries out twice dispersing using dispersion factor, obtains process key：
964C8D22B3FE47037807874F2620BC74；
3) process key is decrypted to PIN ciphertexts, obtains PINBLOCK in plain text：061253DFFEDCBA98；
4) KEK is decrypted to PIK, obtains PIK in plain text：00010203040506070001020304050607；
5) using PIK, to PINBLOCK, encryption obtains the PIN ciphertexts that financial sector can be verified in plain text in plain text：
860D7008189BA96E。
● financial sector verification user cipher process is as follows：
【It is known】
1) the PIN ciphertexts that OTA servers send：860D7008189BA96E；
2) for encrypting the key PIK of PIN plaintexts：00010203040506070001020304050607（For OTA clothes
Business device request generation）.
【Verification is calculated】
1) PIN ciphertexts are decrypted using PIK, obtains PINBLOCK in plain text：061253DFFEDCBA98
2) according to ANSIX9.8Format, PIN is obtained in plain text：123456；
3）Compare the PIN that obtains of decryption whether consistent with the account PIN code stored in financial institution background server in plain text
Judge whether user cipher is correct, the account PIN code 123456 that obtains is decrypted in the present embodiment with financial institution backstage storage
Account PIN code is consistent, is verified, and can be traded.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technology
Within, then the present invention is also intended to comprising these changes and modification.
Claims (9)
1. a kind of PIN turns encryption method, comprises the following steps：
(1) mobile terminal SIM is encrypted generation PIN ciphertexts to account PIN code, and is saved in SIM；Described account
PIN code refers to the PIN of the user's financial IC card provided by financial institution；
(2) PIN ciphertexts are sent to OTA servers by mobile terminal, and OTA server calls its encryption equipments is turned to PIN ciphertexts
Encryption, generates new PIN ciphertexts, and be sent to financial institution server；Described OTA servers timing is to financial institution services
Device is registered, and financial institution server returns to PIK ciphertexts to OTA servers when registering；Described PIK ciphertexts are by financial machine
Structure server encrypts what is obtained using key-encrypting key KEK to key PIK；Key PIK is financial institution server distribution
Key for encrypting account PIN code；Key-encrypting key KEK is financial institution server distribution for protecting key PIK
Key.
2. a kind of PIN as claimed in claim 1 turns encryption method, it is characterised in that：In step (1), mobile terminal SIM pair
Account PIN code be encrypted generation PIN ciphertexts concrete mode be：
(1-1) obtains individual subscriber master key, generates dispersion factor；Described individual subscriber master key is advance by financial institution
In generating and writing financial IC card；
(1-2) is disperseed using dispersion factor to individual subscriber master key, generating process key；
(1-3) encrypts generation PIN ciphertexts to account PIN code using process key.
3. a kind of PIN as claimed in claim 2 turns encryption method, it is characterised in that：Described individual subscriber master key is gold
When melting mechanism and providing financial IC card to user, the card application sequence of user's master key in financial institution server to financial IC card
Row number carries out disperseing what is obtained；User's master key is the hair fastener key that financial institution provides financial IC card, key typing simultaneously
In OTA server for encrypting machines；Card Application Serial Number is the card number of financial IC card.
4. a kind of PIN as claimed in claim 2 turns encryption method, it is characterised in that：In step (1-1), described dispersion because
The byte length of son is 8 bytes, is constituted by random number and using transaction count；If random number and application transaction count are less than 8 words
Section, then mend the bytes of 0x80 to 8, if still less than 8 bytes, continuing to fill up the bytes of 0x00 to 8 in low order end.
5. a kind of PIN as described in one of claim 2 to 4 turns encryption method, it is characterised in that：In step (2), mobile terminal
When PIN ciphertexts are sent into OTA servers, while card Application Serial Number, dispersion factor are sent into OTA servers.
6. a kind of PIN as claimed in claim 1 turns encryption method, it is characterised in that：In step (2), OTA server calls its
Encryption equipment carries out turning encryption to PIN ciphertexts, and the concrete mode for obtaining new PIN ciphertexts is：
The timing of (2-1) OTA servers is registered to financial institution server, and it is close that financial institution server returns to PIK to OTA servers
Text；
PIN ciphertexts that (2-2) OTA servers will send on mobile terminal SIM, card Application Serial Number, dispersion factor and register
The PIK ciphertexts of gained are sent to encryption equipment；
(2-3) encryption equipment is disperseed using card Application Serial Number user's master key built-in to its, obtains individual subscriber master
Key；
(2-4) is disperseed using dispersion factor to individual subscriber master key, generating process key；
(2-5) is decrypted to PIN ciphertexts using process key and is obtained account PIN code；
(2-6) decrypts PIK ciphertexts and obtains key PIK using KEK, account PIN code is encrypted using key PIK obtains new PIN
Ciphertext.
7. a kind of PIN as claimed in claim 6 turns encryption method, it is characterised in that：In step (1-3), process key is used
Before being encrypted to account PIN code, PINBLOCK is generated according to account PIN code, life is encrypted to PINBLOCK using process key
Into PIN ciphertexts.
8. a kind of PIN as claimed in claim 7 turns encryption method, it is characterised in that：In step (2-6), using key PIK pairs
Before the encryption of account PIN code, PINBLOCK is generated according to account PIN code, generation is encrypted to PINBLOCK using key PIK
PIN ciphertexts.
9. a kind of PIN as claimed in claim 8 turns encryption method, it is characterised in that：When being encrypted to PINBLOCK, use
AES be DES algorithms.
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| CN201210583757.9A CN103905196B (en) | 2012-12-28 | 2012-12-28 | A kind of PIN turns encryption method |
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| CN201210583757.9A CN103905196B (en) | 2012-12-28 | 2012-12-28 | A kind of PIN turns encryption method |
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| CN103905196B true CN103905196B (en) | 2017-05-31 |
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| CN104715365B (en) * | 2015-03-13 | 2018-09-07 | 江苏创新睿智科技有限公司 | A method of stored value card space transference is realized based on Bluetooth transmission channel |
| CN106533660B (en) * | 2015-09-14 | 2019-08-20 | 杭州海康威视数字技术股份有限公司 | The acquisition methods and device of secrete key of smart card |
| CN105635168B (en) * | 2016-01-25 | 2019-01-22 | 恒宝股份有限公司 | A kind of application method of offline transaction device and its security key |
| CN106503993A (en) * | 2016-10-26 | 2017-03-15 | 中国银联股份有限公司 | Based on the method for payment and its system that pay labelling realization |
| CN106779703B (en) * | 2016-11-29 | 2020-10-27 | 中国银行股份有限公司 | Dynamic realization method and device for centralized management of bank card key |
| CN108154365B (en) * | 2017-12-19 | 2020-02-14 | 恒宝股份有限公司 | Safety equipment, method and system for generating dynamic two-dimensional code |
| CN108616516A (en) * | 2018-04-03 | 2018-10-02 | 四川新网银行股份有限公司 | A kind of third party's plaintext password method of calibration based on multiple encryption algorithms |
| CN108718317A (en) * | 2018-06-12 | 2018-10-30 | 飞天诚信科技股份有限公司 | A kind of method and device of personal identification number protection |
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