CN104917759B - Based on third-party secure file storage and shared system and method - Google Patents
Based on third-party secure file storage and shared system and method Download PDFInfo
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- CN104917759B CN104917759B CN201510273917.3A CN201510273917A CN104917759B CN 104917759 B CN104917759 B CN 104917759B CN 201510273917 A CN201510273917 A CN 201510273917A CN 104917759 B CN104917759 B CN 104917759B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
- H04L9/0827—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) involving distinctive intermediate devices or communication paths
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6218—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database
- G06F21/6272—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database by registering files or documents with a third party
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H04L63/0435—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/18—Network architectures or network communication protocols for network security using different networks or channels, e.g. using out of band channels
Abstract
The invention discloses one kind based on third-party secure file storage and shared system and method, realizes that encryption file uploads, file download decryption and file security are stored in third party, and realize secure sharing method of the file in system.The present invention realizes the file encryption and file decryption in user terminal, file key is decrypted in user terminal and then re-starts the new file key of encryption generation with other side's public key again, then file key is uploaded to server-side storage, shared file label is carried out in the listed files of shared file recipient side, decrypting file again obtains definitive document in turn using private key decryption file key when shared file recipient needs to obtain shared file.The invention enables the file in shared system is safer, the complexity of cryptograph files sharing method is reduced；Fundamentally reduce system-computed amount；Used encryption key distribution mode makes user have and only weigh to oneself document control, so that file storage is safer.
Description
Technical field
The invention belongs to technical field of information processing, more particularly to one kind based on third-party secure file storage and to share
System and method.
Background technique
More and more personal users either organization user carrys out storing data using third party's service now.Third party deposits
Storage service can provide a variety of benefits for user, including low in cost, easy to use, flexible storage, Additional Services and to data
Central access.
Many users wish to ensure that oneself being stored in third-party information will not arbitrarily be obtained by the third-party institution.Therefore,
User wishes for the data of oneself to be encrypted before submitting to third party.For example, due to privacy concern, it may be personal
User wishes to encrypt the data for being sent to third party storage vendor.Similar, some organization users may want to pair
The data encryption of third party storage vendor is sent to assure compliance with either internally or externally data protection requirement, such as government
Laws and regulations, with the cooperation agreement of its hetero-organization etc., and the data that we are often desirable to us for a user can be into
Row is shared between each other.Therefore, the ciphering user data storage based on third party's storage and decryption downloading and encryption data are total
Enjoying becomes problem now in the urgent need to address.User needs to realize the flexible of permission by flexible access control policy
Setting, to control the shared range of data, and in the confidentiality with guarantee data in user's communication process.
Usually we encrypt file and use the same key using a key, encryption and decryption, because of this mode
File efficiency with higher is encrypted, but when we want file-sharing to other users, and want that him is allowed to read text
Part content, key must be given together other side by us, he can just obtain shared file.But the key of safety is delivered in list
It is very difficult under one key service condition with realization.
Summary of the invention
The purpose of the present invention is to provide one kind based on third-party secure file storage and shared system and method, it is intended to
It solves to be based in third-party storage, can not guarantee user data confidentiality and encrypted file easily and fast altogether very well
The problem of enjoying to other users.
The purpose of the present invention is to provide one kind based on third-party secure file storage and shared system and method, described
Downloading is decrypted to the encryption upload of user terminal file and user based on third-party secure file storage and shared system and method
User file key is got user terminal after file is in encryption upload, file key is decrypted in user terminal by file
Then encryption being re-started with the public key of other side again and generating new file key, be then uploaded to server-side storage, other side uses
File is decrypted again in turn using private key decryption file key when file obtains definitive document.
Further, it is described based on third-party secure file storage and shared system and method specifically includes the following steps:
Step 1, system initialization:
User A is initialized with user B when first logging into system；
User A and user B carries out login system after completing initialization, and landfall process is as follows:
Automatic acquisition is stored in the key file of third party's storing mechanism by logging in system by user, user terminal, and by pair
Registration information carries out Hash calculation and gets password key, by password key decruption key file, solves to key file
User's master key and private key for user are obtained after analysis respectively, and master key and private key are stored in user terminal；
Step 2, file encryption upload；
Step 3, Cryptograph Sharing；
Step 4, file download decryption；
Step 5 is nullified:
When needing to nullify, user terminal can remove the master key and private key for user for being stored in user terminal automatically.
Further, the initialization procedure described in step 1 includes:
The first step, user enter register interface, provide username & password as required and are registered, then user terminal can root
Generate the user password key for meeting symmetric cryptographic key length requirement by hash function in user terminal according to registration information；
Second step, user terminal can be locally generated the secure random number that size is m by local function call, and random number is made
For the master key of user, requirement of the size of m according to symmetric encipherment algorithm to key length is determined, and is also existed at the same time
The key pair of the local asymmetric encryption for generating user；
Third step encrypts user's master key of generation with private key for user by password key, generates ciphertext state
Key file store to user's registration information and arrange by file by being uploaded to third-party platform mechanism after coding and storing
In table；
The public key of generation is directly uploaded in user's registration information list by the 4th step, carries out storage to complete to register.
Further, the file upload procedure described in step 2 includes:
The first step, user A selection need to encrypt the file uploaded, then generate the random of a safety at random by user terminal
Number, length meets symmetric cryptographic key length, using random number as file key；
Second step encrypts selected file by using file key, and encrypted result is buffered in local；
Third step, file key are encrypted by user's master key, and encrypted file key is passed through file
The mode of splicing is spliced to by before the encrypted file of second step, forming a new file, and preceding m byte is encrypted text
Part key is encrypted file content after m byte；
The encryption file newly formed is uploaded to server-side and stored by the 4th step, user A.
Further, the file-sharing described in step 3 specifically includes:
The first step, user A select to need file to be sharing first in the memory space of oneself, and setting file attribute is total
It enjoys, the window of user query is provided, user terminal sends inquiry automatically and asks after user A inputs the user name of user B in window
It asks server-side inquiry user B whether there is, the public key an of confirmation message and user B will be returned if user B exists；
Second step, user A is by sending the encrypted file key of current the wanted shared file of request, third party
The file key of the close state of the current file stored in third-party platform mechanism can be then sent to by platform mechanism after receiving request
User A；
Third step after user A receives the file key of file, obtains file by the master key decryption for being stored in local
Plaintext state file key；
4th step encrypts the file key of plaintext by using the public key of the user B got in the first step
Processing forms the file key of Xinmi City's state；
5th step, the user terminal of user A will newly encrypt obtained key automatically and be encoded to character string by visualization, then
Key after coding is uploaded into third-party platform mechanism, and is inserted into a record in shared file information list and is used to store
Key and relevant information；
6th step, third-party platform mechanism carries out file mark according to shared file information list for user B, so that user
B can see in the memory space of oneself and identify shared file.
Further, the file download described in step 4 specifically includes:
The download decryption of shared file:
The first step, user B select the shared file received in the listed files of oneself, send downloading request；
Second step, third-party platform mechanism judge whether this document is shared file according to downloading request, if it is shared
The file key being stored in shared file information list is then sent to user B by file, while the shared file of request being sent out
User B is sent to cache；
Third step, user terminal will use the private key for user got to solve the file key got in second step
It is close, to get file key, file is decrypted by using file key the original document for getting plaintext；
The download decryption of unshared file:
The first step, user A or B select the unshared file that need to be downloaded, and send downloading request；
Second step, third-party platform mechanism judge whether this document is shared file according to downloading request, if not altogether
File is enjoyed, then sends user A or B for the file of request and caches；
Third step, user terminal obtains the file header of caching, and decrypts header information by the master key of user, obtains
The file key for obtaining plaintext obtains the original document of plaintext by the file key decryption of plaintext, to complete to download.
Another object of the present invention is to provide one kind to be based on third-party secure file storage and shared system, the base
Include: in third-party secure file storage and shared system
The server-side of third party's storing mechanism for storing data；
For carrying out file encryption decryption and sharing operation, carries out the generation of key and the encryption of file and decryption is grasped
The user terminal of work.
Further, described that three layers of key are used based on third-party secure file storage and shared system；
First layer is file key, for encrypting to file；
The second layer is the public and private key of user and master key, and user's public private key pair is used to add file key when shared file
Privacy protection, the master key of user are used to encrypt the file key of file when unshared storage；
Third layer password key, password key is for encrypting the public private key pair and master key of user.
This invention ensures that being stored in the safety of third party's data, and due to all in file upload and downloading process
It is encryption, so being all safe；It maintains secrecy by using the mode of complete client encryption and decryption to user data, thus
Ensure the safety of user data；Using the mode of operation fully transparent to user, user is easy to use, is not required to volume
The purpose of file-sharing can be completed in outer work；Using multistage key, the characteristics of taking full advantage of public and private key, makes shared system
In file it is safer, and greatly reduce the complexity of cryptograph files sharing method；By using a realizing one secrete key for one file and close
The mode of key re-encryption makes shared be not necessarily to full text progress re-encrypted, under conditions of guaranteeing certain safety fundamentally
Reduce the calculation amount of system；Used encryption key distribution mode has user and only has the control to oneself file, makes
It is safer to obtain file storage.
Detailed description of the invention
Fig. 1 is provided in an embodiment of the present invention based on third-party secure file storage and shared system structural schematic diagram；
Fig. 2 is provided in an embodiment of the present invention based on third-party secure file storage and sharing method flow chart；
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The invention mainly comprises the encryption of file upload, the download decryption of file and the sharing operation of ciphertext, Chinese
The encryption and decryption oprerations of part are completed in user terminal, and Cryptograph Sharing operating process includes that file key is got user terminal,
Then file key, which is decrypted, in user terminal re-starts encryption with the public key of other side again and generates new file key, then on
Server-side storage is reached, the private key decryption file key when needing using file using oneself decrypts file in turn again to be obtained
Obtain definitive document.
With reference to the accompanying drawing and specific embodiment is further described application principle of the invention.
As shown in Figure 1, the embodiment of the present invention specifically includes that clothes based on third-party secure file storage and shared system
Business end 1, user terminal 2；
The server-side 1 and user terminal of third party's storing mechanism for storing data are user terminal 2；Wherein, it takes
Business end 1 is substantially carried out the storage of user data, i.e., it can receive the request of user terminal 2 and be handled by the requirement of user terminal 2
Data, at the same he there is also the possibility of leak data.
User terminal 2 is the legitimate device that the owner of file is held, it is that user carries out file encryption decryption and is total to
The core job environment for enjoying operation is safe for users.The generation of key and the encryption of file are carried out in user terminal 2
With decryption oprerations.
Method and process in this implementation example in order to better understand chooses a Cryptograph Sharing process to carry out in detail
Illustrate, the participant of the process mainly has tripartite, comprising: user A (can carry out file encryption upload, file decryption downloading and
File-sharing is initiated) and it is used for user B (encryption upload, file decryption downloading and file-sharing reception that file can be carried out)
The third-party platform mechanism of storing data；Wherein user A is the owner of shared file, it, which has institute's file to be sharing, appoints
What right；User B is the recipient of shared file, is accessed in the case where shared through user A authorization to file；Third party
Platform mechanism is mainly used for storing the file data of user and encrypted key information and user's registration information and respond
User's request.
As shown in Fig. 2, the present invention is implemented, specific step is as follows:
(1) system initialization
In order to realize sharing functionality, user A is initialized when first logging into system with user B.Initially
Change process includes:
1a) user enters register interface, provides username & password as required and is registered, then user terminal system can root
Generate the user password key for meeting symmetric cryptographic key length requirement by hash function 1 in user terminal according to registration information；
1b) user terminal can be locally generated the secure random number that size is m, the random number conduct by local function call
The master key of user, wherein requirement of the size of m according to symmetric encipherment algorithm to key length are determined, at the same time
It is locally generated the key pair of the asymmetric encryption of user, length is also determined by specific algorithm.
1c) user's master key of generation is encrypted with private key for user by password key, generates the close of ciphertext state
This document is stored by being uploaded to third-party platform mechanism after coding, is stored to user's registration information list by key file
In.
1d) public key of generation is directly uploaded in user's registration information list, carries out storage to complete to register.
User A and user B can carry out login system after completing initialization, and landfall process is as described below:
Logging in system by user, automatic acquisition is stored in the key file of third party's storing mechanism by user terminal system, and is led to
Cross and Hash calculation is carried out to registration information get password key, by password key decruption key file, to key file into
User's master key and private key for user are obtained after row parsing respectively, and master key and private key are stored in user terminal.
(2) file encryption uploads
2a) user A selection needs to encrypt the file uploaded, then generates the random number of a safety at random by user terminal,
Its length meets symmetric cryptographic key length, using the random number as file key；
2b) selected file is encrypted by using file key, and encrypted result is buffered in local；
2c) file key is encrypted by user's master key, and encrypted file key is spliced by file
Mode be spliced to by before the encrypted file of step 2b), form a new file, wherein before m byte be encrypted
File key is encrypted file content after m byte.
2d) the encryption file newly formed is uploaded to server-side and stored by user A.
(3) Cryptograph Sharing
3a) user A selects to need first in the memory space of oneself file to be sharing, setting file attribute be it is shared,
At this moment system can provide the window of user query, and user terminal is sent automatically after user A inputs the user name of user B in window
Inquiry request whether there is to server-side inquiry user B, will return to a confirmation message and user B if user B exists
Public key；
3b) user A is by sending the encrypted file key of current the wanted shared file of request, third-party platform
Then the file key of the close state of the current file stored in third-party platform mechanism can be sent to user after authorities to request
A；
After 3c) user A receives the file key of file, this document is obtained by the master key decryption for being stored in local
The file key of plaintext state；
3d) carried out at encryption by using file key of the public key of the user B got in step 3a) to plaintext
Reason forms the file key of Xinmi City's state, herein step 3d) the cryptograph files key only user B that generates can just be decrypted
Real file key is got, also thus ensures the safety of shared file；
3e) user terminal of user A will newly encrypt obtained key automatically and be encoded to character string by visualization, then will compile
Key after code uploads to third-party platform mechanism, and is inserted into a record in shared file information list and is used to store key
And relevant information；
3f) third-party platform mechanism carries out file mark according to shared file information list for user B, enables user B
It is enough to see in the memory space of oneself and identify shared file.
(4) file download is decrypted
4a) user B selects the shared file received in the listed files of oneself, sends downloading request；
4b) third-party platform mechanism judges whether this document is shared file according to downloading request, if it is shared file
The file key being stored in shared file information list is then sent to user B, while sending the shared file of request to
User B is cached, and then executes step 4c；If not shared file then directly by the file of request be sent to user B into
Row decryption oprerations, to obtain the file of final plaintext.
4c) user terminal will use step 1c) in the private key for user that gets to 4b) in the file key that gets solve
It is close, to get file key, file is decrypted by using file key the original document for getting plaintext.
(5) it nullifies
When service system needs to nullify, the master key of user terminal is stored in order to which security needs user terminal can be removed automatically
With private key for user.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (1)
1. one kind is based on third-party secure file storage and sharing method, which is characterized in that described to be based on third-party safety
User file key is got user terminal after encryption uploads when file needs shared by file storage and sharing method,
Then file key, which is decrypted, in user terminal re-starts encryption with the public key of other side again and generates new file key, then on
Server-side storage is reached, other side decrypts file acquisition definitive document using private key decryption file key using when file again in turn；
It is described based on third-party secure file storage and sharing method specifically includes the following steps:
Step 1, system initialization:
User A is initialized with user B when first logging into system；
User A and user B carries out login system after completing initialization, and login process is as follows:
Automatic acquisition is stored in the key file of server-side server-side by logging in system by user, user terminal, and by believing registration
Breath carries out Hash calculation and gets password key, by password key decruption key file, divides after parsing to key file
Not Huo get user's master key and private key for user, and master key and private key are stored in user terminal；
Step 2, file encryption upload；
Step 3, Cryptograph Sharing；
Step 4, file download decryption；
Step 5 is nullified:
When needing to nullify, user terminal can remove the master key and private key for user for being stored in user terminal automatically；
The initialization procedure described in step 1 includes:
The first step, user enter register interface, provide username & password as required and are registered, then user terminal can be according to note
Volume information generates the user password key for meeting symmetric cryptographic key length requirement in user terminal by hash function；
Second step, user terminal can be locally generated the secure random number that size is m by local function call, and random number is as use
The master key at family, requirement of the size of m according to symmetric encipherment algorithm to key length are determined, at the same time also in local
Generate the key pair of the asymmetric encryption of user；
Third step encrypts user's master key of generation with private key for user by password key, generates the close of ciphertext state
File is stored by being uploaded to server-side after coding, is stored into user's registration information list by key file；
The public key of generation is directly uploaded in user's registration information list by the 4th step, carries out storage to complete to register；
The file encryption upload procedure described in step 2 includes:
The first step, user A selection need to encrypt the file uploaded, then generate the random number of a safety at random by user terminal,
Length meets symmetric cryptographic key length, using random number as file key；
Second step encrypts selected file by using file key, and encrypted result is buffered in local；
Third step, file key are encrypted by user's master key, and encrypted file key is spliced by file
Mode be spliced to by before the encrypted file of second step, form a new file, preceding m byte is that encrypted file is close
Key is encrypted file content after m byte；
The encryption file newly formed is uploaded to server-side and stored by the 4th step, user A；
The Cryptograph Sharing described in step 3 specifically includes:
The first step, user A select to need first in the memory space of oneself file to be sharing, setting file attribute be it is shared,
There is provided user query window, after user A inputs the user name of user B in window user terminal send automatically inquiry request to
Server-side inquiry user B whether there is, and the public key an of confirmation message and user B will be returned if user B exists；
Second step, user A are received by sending the encrypted file key of current the wanted shared file of request, server-side
Then the file key of the close state of the current file stored in server-side can be sent to user A after to request；
Third step after user A receives the file key of file, obtains the bright of file by the master key decryption for being stored in local
The file key of literary state；
4th step is encrypted the file key of plaintext by using the public key of the user B got in the first step,
Form the file key of Xinmi City's state；
5th step, the user terminal of user A will newly encrypt obtained key automatically and be encoded to character string by visualization, then will compile
Key after code uploads to server-side, and is inserted into a record in shared file information list and is used to store key and correlation
Information；
6th step, server-side carry out file mark according to shared file information list for user B, enable user B at oneself
Memory space in see and identify shared file；
The decryption of the file download described in step 4 specifically includes:
The download decryption of shared file:
The first step, user B select the shared file received in the listed files of oneself, send downloading request；
Second step, server-side judge whether this document is shared file according to downloading request, then will storage if it is shared file
File key in shared file information list is sent to user B, while sending user B for the shared file of request and carrying out
Caching；
Third step, user terminal will use the private key for user got that the file key got in second step is decrypted, from
And file key is got, file is decrypted by using file key the original document for getting plaintext；
The download decryption of unshared file:
The first step, user A or B select the unshared file that need to be downloaded, and send downloading request；
Second step, server-side judge whether this document is shared file according to downloading request, if not shared file, then will ask
The file asked is sent to user A or B and caches；
Third step, user terminal obtains the file header of caching, and decrypts header information by the master key of user, obtains
To the file key of plaintext, the original document of plaintext is obtained by the file key decryption of plaintext, to complete to download；
The system comprises:
Server-side for storing data；
For carrying out file encryption decryption and sharing operation, the generation of key and the encryption of file and decryption oprerations are carried out
User terminal；
The system uses three layers of key；
First layer is file key, for encrypting to file；
The second layer is the public and private key of user and master key, and user's public private key pair is used to carry out encryption guarantor to file key when shared file
Shield, the master key of user are used to encrypt the file key of file when unshared storage；
Third layer is password key, and password key is for encrypting the public private key pair and master key of user.
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| CN201510273917.3A CN104917759B (en) | 2015-05-26 | 2015-05-26 | Based on third-party secure file storage and shared system and method |
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Application publication date: 20150916 Assignee: Xi'an Panshi Anchuang Information Technology Co.,Ltd. Assignor: XIDIAN University Contract record no.: X2022980003331 Denomination of invention: Secure file storage and sharing system and method based on third party Granted publication date: 20190222 License type: Common License Record date: 20220328 |
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