CN104219228B - A kind of user's registration, user identification method and system - Google Patents
A kind of user's registration, user identification method and system Download PDFInfo
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- CN104219228B CN104219228B CN201410405307.XA CN201410405307A CN104219228B CN 104219228 B CN104219228 B CN 104219228B CN 201410405307 A CN201410405307 A CN 201410405307A CN 104219228 B CN104219228 B CN 104219228B
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Abstract
The invention discloses a kind of user's registration, user identification method and system, it is desirable to provide a kind of client registers and user identification method of the encryption based on http agreements.Technical key point：Including：Step 1：User name and password are encrypted using symmetrical enciphering and deciphering algorithm for client；Step 2：User name after encryption and password are transferred to server by client according to http agreements；Step 3：The user name and password that receive are decrypted the symmetrical enciphering and deciphering algorithm of server by utilizing；Whether the user name there is in searching data storehouse, if being not present, the server then public key encryption using symmetrical enciphering and deciphering algorithm to succeed in registration information and a rivest, shamir, adelman, while to its database write access customer name and password；If in the presence of if using the symmetrical enciphering and deciphering algorithm to the registration failure information of return is encrypted；Step 4：The encryption information that execution step 3 obtains is transferred to client etc. by server according to http agreements.
Description
Technical field
It is especially a kind of based on the client registers of encryption technology and user's identification side the present invention relates to network security technology
Method.
Background technology
For common cloud computing platform when identifying user, the mode of generally use is to use HTTPS agreements, and it ensure that end
Information transfer between end and server is to encrypt, be safe.But this technology is for terminals such as intelligent television, intelligent air conditions
For equipment, just less it is adapted to.Because for the application APP fields of household electrical appliances, HTTPS agreements have disadvantages that.Mainly have：
1）HTTPS agreements need CA to apply for certificate, and certificate is all charge, and which increase the cost of terminal.
2）HTTPS is the SSL encryption host-host protocol for having security, and compared with http protocol, it is to network bandwidth resources
Consumption it is much greater.
3）It adds the loss of server resource, it is necessary to which more hardware servers, also increase the service of producer
Cost.
That is, if a server is originally using http protocol for multiple client connection, the client of support
Connection number can reach 3000, and use HTTPS agreements to be connected for multiple client, and the client connection number of support can only achieve
More than 600.Therefore if a certain producer needs to support the access of 1,000,000 numbers of users, it is necessary to configure more servers.
The content of the invention
It can be seen that https agreements although can guarantee that the information transmission security between terminal and server but cost is too late
Information transfer cost based on http agreements is low.The problem of existing for this, the present invention provide a kind of based on http agreements
The client registers and user identification method of encryption.
Present invention employs following technical scheme：
A kind of user registering method, it is characterised in that client on server with including the symmetrical encryption and decryption of identical
Algorithm, including：
Step 1：User name and password are encrypted using the symmetrical enciphering and deciphering algorithm for client；
Step 2：User name after encryption and password are transferred to server by client according to http agreements；
Step 3：The user name and password that receive are decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing；Search
Whether the user name there is in the database of server, if being not present, server is first with rivest, shamir, adelman
This user produces a public private key pair, using the symmetrical enciphering and deciphering algorithm to by return succeed in registration information and the public key enters
Row encryption, while server writes user name, password and the private key to its database；If in the presence of server then utilizes
The symmetrical enciphering and deciphering algorithm is to the registration failure information of return is encrypted；
Step 4：The encryption information that execution step 3 obtains is transferred to client by server according to http agreements；
Step 5：The information that client is returned using the symmetrical enciphering and deciphering algorithm to server is decrypted, and is registered
Successful information and the public key obtain registration failure information；
The public key is used for client in login service device to encrypting its log-on message before server transport log-on message.
Further, in the step 5, what client received is registration failure information, then repeats step 1 ~ 5, directly
To succeeding in registration.
Further, in the step 3, server is writing the password of client the specific method bag of the database
Include：First with irreversible encryption algorithm calculate the client password cryptographic Hash and by plus salt algorithm, then by the Hash
Value is together with the user name, private key character string plus salt character string write into Databasce.
Present invention also offers a kind of user identification method, client symmetrically adds solution with including identical on server
Close algorithm, including：
Step 1：User name and login password are encrypted using the symmetrical enciphering and deciphering algorithm for client；
Step 2：User name after encryption and login password are transferred to server by client according to http agreements；
Step 3：The user name and login password that receive are decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing；
Then the corresponding login password of user name described in the database of obtained login password with server will be decrypted to be contrasted, if
Identical, server is generated a random key and then entered using the symmetrical enciphering and deciphering algorithm to logining successfully information and random key
Row encryption；If differing, then login failure information is encrypted using the symmetrical enciphering and deciphering algorithm for server；
Step 4：The encryption information that execution step 3 obtains is transferred to client by server according to http agreements；
Step 5：The information that client is returned using the symmetrical enciphering and deciphering algorithm to server is decrypted, and is logged in
Successful information and the random key obtain login failure information；
The random key is that client is served by required checking password using what server provided.
Further, step 1 further comprises：Login password is encrypted the public key that client obtains first with registration,
Then the symmetrical enciphering and deciphering algorithm is reused the login password after user name and asymmetric encryption is encrypted；
Accordingly, step 3 further comprises：Symmetrical enciphering and deciphering algorithm described in server by utilizing is carried out to the information received
Decryption, obtains the login password after user name and public key encryption；Server recycles private corresponding to user name described in database
Key is decrypted to the login password after the public key encryption, obtains login password；Server and then the login password for obtaining decryption
The corresponding login password of user name described in database with server is contrasted, if identical, server generation one is with secret
Key is simultaneously then encrypted using the symmetrical enciphering and deciphering algorithm to logining successfully information and random key；If differing, server
Then login failure information is encrypted using the symmetrical enciphering and deciphering algorithm.
Further, all user names to succeed in registration, and its corresponding login password are stored with the database of server
Cryptographic Hash, the cryptographic Hash of the login password using irreversible encryption algorithm by calculating what login password obtained；
Step 3 further comprises：The information received is decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing, obtains
Login password to after user name and public key encryption；Server recycles private key corresponding to user name described in database to described
Login password decryption after public key encryption, obtains login password；Server and then the cryptographic Hash that obtained login password will be decrypted
The cryptographic Hash of the corresponding login password of user name described in database with server is contrasted, if identical, server generation
One random key is simultaneously encrypted using the symmetrical enciphering and deciphering algorithm to logining successfully information and random key；If differing,
Then login failure information is encrypted using the symmetrical enciphering and deciphering algorithm for server.
The corresponding above method, present invention also offers the client floppy disk system that a kind of user logs in, including：
Symmetrical encryption module, for user name and login password to be encrypted using symmetrical enciphering and deciphering algorithm；
Information sending module, for the information transfer after symmetrical encryption module is encrypted according to http agreements to server；
And symmetrical deciphering module, the information for being returned using the symmetrical enciphering and deciphering algorithm to server are solved
It is close, obtain logining successfully information and the random key or obtain login failure information；
The random key is that client is served by required checking password using what server provided.
Further, in addition to：
Asymmetric encryption module, for the login password to be encrypted using the public key obtained when registering；
Accordingly, after the symmetrical encryption module is used to utilize the symmetrical enciphering and deciphering algorithm to user name and public key encryption
Login password be encrypted.
A kind of server floppy disk system for identifying user, including：
Symmetrical deciphering module, for being solved using symmetrical enciphering and deciphering algorithm to the user name and login password that receive
It is close；
Log-on message authentication module, for user name described in the database of obtained login password and server will to be decrypted
Corresponding login password is contrasted, if identical, generates a random key, by the random key and logins successfully information friendship
By symmetrical encryption module, if differing, login failure information is transferred into symmetrical encryption module；
Symmetrical encryption module, for using the symmetrical enciphering and deciphering algorithm to described in the output of log-on message authentication module with
Secret key and login successfully information or log-on message authentication module output login failure information be encrypted；
Information sending module, for the symmetrical encryption module to be encrypted into obtained information transfer to visitor according to http agreements
Family end；
The random key is that client is served by required checking password using what server provided.
Further, in addition to asymmetric deciphering module, all succeed in registration and is stored with the database of server
The cryptographic Hash of user name and its corresponding login password, the cryptographic Hash of the login password using irreversible encryption algorithm by being calculated
What login password obtained；
The symmetrical deciphering module is used for using the symmetrical enciphering and deciphering algorithm to the user name and public key encryption that receive
Login password be decrypted, obtain the login password of user name and public key encryption；
The asymmetric deciphering module is used for using private key corresponding to user name described in database to the public key encryption
Login password decryption afterwards, obtains login password；
Irreversible encryption module, for calculating the cryptographic Hash of the login password after decryption using irreversible encryption algorithm；
Log-on message authentication module, for institute in the obtained cryptographic Hash of login password and the database of server will to be decrypted
The cryptographic Hash for stating login password corresponding to user name is contrasted, if identical, generates a random key, by the random key
And login successfully information and then transfer to the symmetrical encryption module, if differing, by login failure information transfer to it is described symmetrical plus
Close module.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. because the information that client and server are sent in the present invention is all by encryption, even if transmitting information from biography
Illegally stolen in defeated channel, can not also crack the plaintext of transmission information, realize the user information safety based on http agreements and recognize
Card, while remain the low-cost advantage of http agreements.
2. in the user identification method in the present invention, rivest, shamir, adelman and irreversible encryption has also further been used to calculate
Method, it more ensure that the reliability of certification.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the flow chart of user registering method one embodiment in the present invention.
Fig. 2 is the flow chart of user login method one embodiment in the present invention.
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine in any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent by other or with similar purpose
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
.
First embodiment：
Such as Fig. 1, a kind of user registering method, client with including the symmetrical enciphering and deciphering algorithm of identical on server,
And both sides follow http communication protocols, including：
Step 1：User name and password are encrypted using the symmetrical enciphering and deciphering algorithm for client；
Step 2：User name after encryption and password are transferred to server by client according to http agreements；
Step 3：The user name and password that receive are decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing；Search
Whether the user name there is in the database of server, if being not present, server is then using rivest, shamir, adelman
This user produces the key pair of a public/private keys, and symmetrical enciphering and deciphering algorithm described in server by utilizing is to by the note of return
Volume successful information and the public key are encrypted, while server writes user name, password and the private to database
Key；If in the presence of server is then using the symmetrical enciphering and deciphering algorithm to the registration failure information of return is encrypted；
Step 4：The encryption information that execution step 3 obtains is transferred to client by server according to http agreements；
Step 5：The information that client is returned using the symmetrical enciphering and deciphering algorithm to server is decrypted, and is registered
Successful information and the public key obtain registration failure information.
The symmetrical enciphering and deciphering algorithm can be any one existing algorithm, and rivest, shamir, adelman can be existing
, the rivest, shamir, adelman is located on server, there is provided a pair of public keys and private key, private key is stored with server, by public affairs
Key is distributed to the user to succeed in registration, and subsequent user can utilize the log-on messages such as the public key encryption login password.
In another embodiment, in the step 5, when what client received is registration failure information, repeats and perform
Step 1 ~ 5, until succeeding in registration.
Further, in the step 3, server is writing the password of client the specific method bag of the database
Include：The cryptographic Hash of the client password is calculated first with irreversible encryption algorithm, then by the cryptographic Hash together with the user
Name, private key write into Databasce together.
In other embodiments, the cryptographic Hash of the login password is by using irreversible encryption algorithm, such as SHA-1 algorithms,
Like this, even internal operation/operation maintenance personnel can not also obtain the plaintext of password from database, so as to protect account
Safety.More it is difficult to crack in order that obtaining the ciphertext that irreversible encryption algorithm is calculated, can also simultaneously uses plus salt is calculated
Method.Now, in the step 3, server includes in the specific method that the password of client is write to the database：First profit
The cryptographic Hash of the client password is calculated with irreversible encryption algorithm, reuses plus cryptographic Hash and one is added salt figure group by salt algorithm
It is combined to obtain a string of character strings, then together with the user name, the private key and adds salt figure to write the character string
Enter database.
Second embodiment：
Such as Fig. 2, user is such by user name and login password login service device, detailed process after registration：
First, the symmetrical enciphering and deciphering algorithm of identical is included on client and server, including：
Step 1：User name and login password are encrypted using the symmetrical enciphering and deciphering algorithm for client；
Step 2：User name after encryption and login password are transferred to server by client according to http agreements；
Step 3：The user name and login password that receive are decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing；
Then the corresponding login password of user name described in the database of obtained login password with server will be decrypted to be contrasted, if
Identical, server is generated a random key and carried out using the symmetrical enciphering and deciphering algorithm to logining successfully information and random key
Encryption；If differing, then login failure information is encrypted using the symmetrical enciphering and deciphering algorithm for server；
Step 4：The encryption information that execution step 3 obtains is transferred to client by server according to http agreements；
Step 5：The information that client is returned using the symmetrical enciphering and deciphering algorithm to server is decrypted, and is logged in
Successful information and the random key obtain login failure information；
The random key is that client is served by required checking password in short-term using what server provided.Service
User name and random key are stored in internal memory or high-speed processing apparatus by device（Such as SSD）In, and it is effective for random key setting
Time（Such as 8 hours effectively）.After user takes random key, user name and random need to be only used in the random key valid period
Key is logged in and is served by using what server provided, without going to log in public key encryption password, both ensure that information security
It in turn simplify the logging program of user.Symmetric encipherment algorithm in the present embodiment is as in first embodiment, random cipher
It can be one group of random number.
In other embodiments, in step 5 after client receives the information of login failure, can repeat step 1 ~
5。
3rd embodiment：
The present embodiment is improved step 1 wherein, 3 on the basis of second embodiment.
Step 1 further comprises：Login password is encrypted the public key obtained when client is first with registration, Ran Houzai
The login password after user name and public key encryption is encrypted using the symmetrical enciphering and deciphering algorithm；
Accordingly, step 3 further comprises：The information received is decrypted using the symmetrical enciphering and deciphering algorithm
To user name and the ciphertext of login password；Then private key corresponding to user name described in database will be used to decrypt the ciphertext,
The login password of user is obtained, will decrypt that user name described in the database of obtained login password with server is corresponding to be stored
Login password is contrasted, if identical, then it represents that user logins successfully, and server generates a random key and then using described right
Enciphering and deciphering algorithm is claimed to be encrypted to logining successfully information and random key；If differing, server is then symmetrically added using described
Login failure information is encrypted decipherment algorithm.
Fourth embodiment：
In order to further ensure that the safety of login password, the present embodiment has done further excellent on the basis of 3rd embodiment
Change.
All user names to succeed in registration and its cryptographic Hash of corresponding login password are stored with the database of server,
The cryptographic Hash of the login password, such as SHA-1 algorithms, calculates what login password obtained by using irreversible encryption algorithm.So
If, even internal operation/operation maintenance personnel can not also obtain the plaintext of password from database, so as to protect the peace of account
Entirely.
Step 3 further comprises：The information received is decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing, obtains
Login password to after user name and public key encryption；Server recycles private key corresponding to user name described in database to described
Login password after public key encryption is decrypted, and obtains login password；Server recycles irreversible encryption algorithm to calculate decryption
Login password afterwards obtains a cryptographic Hash, and by user name described in the database of the cryptographic Hash with server it is corresponding log in it is close
The cryptographic Hash of code is contrasted, if identical, server generates a random key and then using the symmetrical enciphering and deciphering algorithm to stepping on
Record successful information and random key are encrypted；If differing, server is then lost using the symmetrical enciphering and deciphering algorithm to logging in
Information is lost to be encrypted.
Symmetric encipherment algorithm is easy to be cracked, and the rivest, shamir, adelman of public/private keys is not easy to crack, in reality
In, make server regular（Such as every half a year）The key pair of a public/private keys is changed, effectively prevents from artificially divulging a secret.
More safely may be used in order that the irreversible encryption algorithm in the present embodiment calculates the cryptographic Hash that login password obtains
Lean on, can also simultaneously use and add salt algorithm.So step 3 further comprises：Symmetrical enciphering and deciphering algorithm pair described in server by utilizing
The information received is decrypted, and obtains the login password after user name and public key encryption；Server recycles institute in database
State private key corresponding to user name the login password after the public key encryption is decrypted, obtain login password；Server is sharp again
The cryptographic Hash of the login password after decryption is calculated with irreversible encryption, reuses plus salt algorithm will be somebody's turn to do in the cryptographic Hash and database
Corresponding to user name plus salt figure is combined computing and obtains a character string, will be used described in the database of the character string and server
Character string is contrasted corresponding to name in an account book, if identical, server is generated a random key and then calculated using the symmetrical encryption and decryption
Method is encrypted to logining successfully information and random key；If differing, server then utilizes the symmetrical enciphering and deciphering algorithm pair
Login failure information is encrypted.
The invention is not limited in foregoing embodiment.The present invention, which expands to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (9)
1. a kind of user registering method, it is characterised in that client is calculated with including the symmetrical encryption and decryption of identical on server
Method, including：
Step 1：User name and password are encrypted using the symmetrical enciphering and deciphering algorithm for client；
Step 2：User name after encryption and password are transferred to server by client according to http agreements；
Step 3：The user name and password that receive are decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing；Search service
Whether the user name there is in the database of device, if being not present, server is used first with rivest, shamir, adelman for this
Family produces a public private key pair, using the symmetrical enciphering and deciphering algorithm to by return succeed in registration information and public key is encrypted,
Server writes user name, password and the private key to its database simultaneously；If in the presence of server is then using described symmetrical
Enciphering and deciphering algorithm is to the registration failure information of return is encrypted；
Step 4：The encryption information that execution step 3 obtains is transferred to client by server according to http agreements；
Step 5：The information that client is returned using the symmetrical enciphering and deciphering algorithm to server is decrypted, and is succeeded in registration
Information and the public key obtain registration failure information；
The public key is used for client in login service device to encrypting its log-on message before server transport log-on message.
2. a kind of user registering method according to claim 1, it is characterised in that in the step 5, client receives
Be registration failure information, then step 1 ~ 5 are repeated, until succeeding in registration.
A kind of 3. user registering method according to claim 1 or 2, it is characterised in that in the step 3, server
Include in the specific method that the password of client is write to the database：The client is calculated first with irreversible encryption algorithm
The cryptographic Hash of password is held, then by the cryptographic Hash together with the user name write into Databasce.
4. a kind of user identification method, it is characterised in that client is calculated with including the symmetrical encryption and decryption of identical on server
Method, including：
Step 1：User name and login password are encrypted using the symmetrical enciphering and deciphering algorithm for client；
Step 2：User name after encryption and login password are transferred to server by client according to http agreements；
Step 3：The user name and login password that receive are decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing；Then
The corresponding login password of user name described in the database of obtained login password with server will be decrypted to be contrasted, if phase
Together, server is generated a random key and added using the symmetrical enciphering and deciphering algorithm to logining successfully information and random key
It is close；If differing, then login failure information is encrypted using the symmetrical enciphering and deciphering algorithm for server；
Step 4：The encryption information that execution step 3 obtains is transferred to client by server according to http agreements；
Step 5：The information that client is returned using the symmetrical enciphering and deciphering algorithm to server is decrypted, and is logined successfully
Information and the random key obtain login failure information；
The random key is that client is served by required checking password using what server provided.
5. a kind of user identification method according to claim 4, it is characterised in that step 1 further comprises：Client is first
Login password is encrypted using registration obtained public key, then reuses the symmetrical enciphering and deciphering algorithm to user name and non-
Login password after symmetric cryptography is encrypted；
Accordingly, step 3 further comprises：Symmetrical enciphering and deciphering algorithm solves to the information received described in server by utilizing
It is close, obtain the login password after user name and public key encryption；Server recycles private key corresponding to user name described in database
Login password after the public key encryption is decrypted, obtains login password；Server then will decrypt obtained login password with
Login password corresponding to user name is contrasted described in the database of server, if identical, server generates a random key
And it is encrypted using the symmetrical enciphering and deciphering algorithm to logining successfully information and random key；If differing, server is then sharp
Login failure information is encrypted with the symmetrical enciphering and deciphering algorithm.
6. a kind of user identification method according to claim 5, it is characterised in that stored in the database of server
There are the user name to succeed in registration, and its cryptographic Hash of corresponding login password, the cryptographic Hash of the login password can not by use
Reverse encryption algorithm calculates what login password obtained；
Step 3 further comprises：The information received is decrypted symmetrical enciphering and deciphering algorithm described in server by utilizing, is used
Login password after name in an account book and public key encryption；Server recycles private key corresponding to user name described in database to the public key
Login password decryption after encryption, obtains login password；Server and then the cryptographic Hash and clothes that obtained login password will be decrypted
Be engaged in device database described in the cryptographic Hash of login password corresponding to user name contrasted, if identical, server generation one with
Secret key is simultaneously encrypted using the symmetrical enciphering and deciphering algorithm to logining successfully information and random key；If differing, service
Then login failure information is encrypted using the symmetrical enciphering and deciphering algorithm for device.
A kind of 7. FTP client FTP that user logs in, it is characterised in that including：
Symmetrical encryption module, for user name and login password to be encrypted using symmetrical enciphering and deciphering algorithm；
Information sending module, for the information transfer after symmetrical encryption module is encrypted according to http agreements to server；
And symmetrical deciphering module, the information for being returned using the symmetrical enciphering and deciphering algorithm to server are decrypted, obtained
To logining successfully information and random key or obtain login failure information；
The random key is that client is served by required checking password using what server provided,
Also include asymmetric encryption module, for the login password to be encrypted using the public key obtained when registering,
Accordingly, the symmetrical encryption module is used for using the symmetrical enciphering and deciphering algorithm to stepping on after user name and public key encryption
Record password is encrypted.
A kind of 8. server system for identifying user, it is characterised in that including：
Symmetrical deciphering module, for the user name and login password that receive to be decrypted using symmetrical enciphering and deciphering algorithm；
Log-on message authentication module, it is corresponding for user name described in database of the obtained login password with server will to be decrypted
Login password contrasted, if identical, generate a random key, by the random key and login successfully information and transfer to pair
Claim encrypting module, if differing, login failure information is transferred into symmetrical encryption module；
Symmetrical encryption module, for using the symmetrical enciphering and deciphering algorithm to described in the output of log-on message authentication module with secret
Key and login successfully information or log-on message authentication module output login failure information be encrypted；
Information sending module, for the information transfer encrypting to obtain by the symmetrical encryption module according to http agreements to client
End；
The random key is that client is served by required checking password using what server provided.
9. a kind of server system for identifying user according to claim 8, it is characterised in that also including asymmetric decryption
The Hash of all user names to succeed in registration and its corresponding login password is stored with module, and the database of server
Value, the cryptographic Hash of the login password using irreversible encryption algorithm by calculating what login password obtained；
The symmetrical deciphering module is used for the stepping on to the user name that receives and public key encryption using the symmetrical enciphering and deciphering algorithm
Record password is decrypted, and obtains the login password of user name and public key encryption；
After the asymmetric deciphering module is used for using private key is to the public key encryption corresponding to user name described in database
Login password is decrypted, and obtains login password；
Irreversible encryption module, for calculating the cryptographic Hash of the login password after decryption using irreversible encryption algorithm；
Log-on message authentication module, used for will decrypt described in the obtained cryptographic Hash of login password and the database of server
The cryptographic Hash of login password corresponding to name in an account book is contrasted, if identical, generates a random key, by the random key and is stepped on
Record successful information then transfers to the symmetrical encryption module, if differing, login failure information is transferred into the symmetric cryptography mould
Block.
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| CN201410405307.XA CN104219228B (en) | 2014-08-18 | 2014-08-18 | A kind of user's registration, user identification method and system |
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| CN201410405307.XA CN104219228B (en) | 2014-08-18 | 2014-08-18 | A kind of user's registration, user identification method and system |
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