CN104917759A - Third-party-based safety file storage and sharing system and method - Google Patents
Third-party-based safety file storage and sharing system and method Download PDFInfo
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- CN104917759A CN104917759A CN201510273917.3A CN201510273917A CN104917759A CN 104917759 A CN104917759 A CN 104917759A CN 201510273917 A CN201510273917 A CN 201510273917A CN 104917759 A CN104917759 A CN 104917759A
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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
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- 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
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- 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
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- 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 a third-party-based safety file storage and sharing system and method. With the system and method, encrypted file uploading, file downloading and decryption, safety file storage to a third party, and safety sharing of a file in a system are realized. According to the invention, file encryption and decryption at a user terminal is realized. Decryption is carried out on a file secret key at a user terminal and then encryption is carried out again by using an opposite-party public key to generate a new file secret key; the file secret key is uploaded to a server side for storage; a shared file mark is made in a file list of a shared file receiver; and when the shared file receiver needs to obtain a shared file, the file secret key is decrypted by using a private key and then the file is decrypted, thereby obtaining a final file. Therefore, file safety in a sharing system can be guaranteed; and complexity of a sharing method of ciphertext files is reduced. The system calculated amount is reduced fundamentally. With the secret key distribution way, the user only has the control permission on own files, so that file storage becomes safe.
Description
Technical field
The invention belongs to technical field of information processing, particularly relate to a kind of based on third-party secure file storage and shared system and method.
Background technology
Increasing personal user or organization user use third party to serve to store data now.Third party's stores service can provide multiple benefit for user, comprises with low cost, easy to use, flexible storage, Additional Services and the central access to data.
Many users want to guarantee that oneself being stored in third-party information arbitrarily can not be obtained by the third-party institution.Therefore, user wishes the data of oneself to be encrypted before submitting to third party.Such as, due to privacy concern, possible personal user wishes sending to the data of third party storage vendor to be encrypted.Similar; some organization users may wish sending to the data encryption of third party storage vendor to guarantee to observe inner or external data protection requirement; such as governments and laws regulation, with the cooperation agreement etc. of its hetero-organization, and we often wish that our data can be shared each other for user.Therefore, the ciphering user data stored based on third party stores and deciphering is downloaded and enciphered data is shared and become problem now in the urgent need to address.User needs, by access control policy flexibly, to realize the flexible setting of authority, thus the shared scope of control data, and with telex network process in ensure the confidentiality of data.
Usually our encrypt file uses a key, encrypt and decrypt all uses same key, because this mode encrypt file has higher efficiency, but when we want by file-sharing give other users time, and want to allow him read file content, key must be given the other side by together, and he just can obtain the file shared.But the key of safety is paid and is very difficult to realize under single key service condition.
Summary of the invention
The object of the present invention is to provide a kind of based on third-party secure file storage and shared system and method, be intended to solve based in third-party storage, cannot ensure that the file after user data confidentiality and encryption shares to the problem of other users easily and fast very well.
The object of the present invention is to provide a kind of based on third-party secure file storage and shared system and method, described based on third-party secure file storage and shared system and the encryption of method to user side file is uploaded and user deciphers download file, when user file key is got user side by file after encryption is uploaded, file key is decrypted at user side and then re-starts to encrypt with the PKI of the other side and generate new file key, then be uploaded to service end to store, use when the other side uses file private key declassified document key so that again declassified document obtain definitive document.
Further, describedly specifically to comprise the following steps based on third-party secure file storage and shared system and method:
Step one, system initialization:
User A and user B carries out initialization when login system first;
Namely user A and user B carries out login system after completing initialization, and landfall process is as follows:
Logging in system by user, automatic acquisition is stored in the key file of third party's storing mechanism by user side, and get password key by carrying out Hash calculation to log-on message, by password key decruption key file, obtain user's master key and private key for user respectively after key file is resolved, and master key and private key are stored in user side;
Step 2, file encryption is uploaded;
Step 3, Cryptograph Sharing;
Step 4, file download is deciphered;
Step 5, nullify:
When needs are nullified, user side can remove the master key and the private key for user that are stored in user side automatically.
Further, described in step one, initialization procedure comprises:
The first step, user enters register interface, provides username & password to register on request, and then user side can generate according to log-on message the user password key meeting symmetric cryptographic key length requirement by hash function at user side;
Second step, it is the secure random number of m that user side can generate size by local function call in this locality, random number is as the master key of user, the size of m is determined the requirement of key length according to symmetric encipherment algorithm, meanwhile also generates the double secret key of the asymmetric encryption of user in this locality;
3rd step, is encrypted user's master key of generation and private key for user by password key, the key file of generating ciphertext state, being stored by file, being stored in user's registration information list by being uploaded to third-party platform mechanism after coding;
4th step, is directly uploaded to the PKI of generation in user's registration information list, carries out storing thus completing registration.
Further, described in step 2, files passe process comprises:
The first step, user A selects to need to encrypt the file uploaded, and then by the random number of a user side stochastic generation safety, length meets symmetric cryptographic key length, using random number as file key;
Second step, by using file key to be encrypted selected file, and is buffered in this locality by encrypted result;
3rd step, file key is encrypted by user's master key, and before the file key after encryption is spliced to the file after being encrypted by second step by the mode that file splices, forms a new file, front m byte is the file key after encryption, is the file content after encryption after m byte;
4th step, the encrypt file newly formed is uploaded to service end and stores by user A.
Further, described in step 3, file-sharing specifically comprises:
The first step, first user A selects the file needing to share in the memory space of oneself, it is shared for arranging file attribute, the window that user inquires about is provided, after user A inputs the user name of user B in window, whether user side automatically sends inquiry request and exists to service end inquiring user B, if user B exists, will return the PKI of a confirmation and user B;
Second step, user A is by sending request the file key after the encryption obtaining current wanted shared file, and the file key of close for the current file stored in third-party platform mechanism state then can be sent to user A by third-party platform authorities after request;
3rd step, after user A receives the file key of file, obtains the file key of the plaintext state of file by being stored in local master key deciphering;
4th step, by using the PKI of the user B got in a first step to be encrypted file key expressly, forms the file key of Xinmi City's state;
5th step, the user side of user A is encoded to character string by newly encrypting the key obtained by visual automatically, then the key after coding is uploaded to third-party platform mechanism, and in shared file information list, insert a record be used for storage key and relevant information;
6th step, third-party platform mechanism carries out file mark according to shared file information list for user B, makes user B to see in the memory space of oneself and to identify shared file.
Further, described in step 4, file download specifically comprises:
The download decryption of shared file:
The first step, user B selects the shared file received in the listed files of oneself, sends download request;
Second step, according to download request, third-party platform mechanism judges whether this file is shared file, if the file key be stored in shared file information list is then sent to user B by shared file, the shared file of request is sent to user B simultaneously and carries out buffer memory;
3rd step, user side is decrypted using the private key for user got the file key got in second step, thus gets file key, file is decrypted to the original document getting plaintext by using file key;
The download decryption of unshared file:
The first step, user A or B selects the unshared file that need download, and sends download request;
Second step, according to download request, third-party platform mechanism judges whether this file is shared file, if not shared file, then the file of request is sent to user A or B and carries out buffer memory;
3rd step, user side obtains the file header of buffer memory, and deciphers header information by the master key of user, acquires file key expressly, is obtained the original document of plaintext, thus complete download by file key deciphering expressly.
Another object of the present invention is to provide a kind of based on third-party secure file storage and shared system, describedly to comprise based on third-party secure file storage and shared system:
For storing the service end of third party's storing mechanism of data;
For carrying out file encryption deciphering and sharing operation, carry out the user side of the generation of key and the encrypt and decrypt operation of file.
Further, describedly three layers of key are used based on third-party secure file storage and shared system;
Ground floor is file key, is used for being encrypted protection to file;
The second layer is the public and private key of user and master key, is encrypted protection when user's public private key pair is used for shared file to file key, the file key of encrypt file when the master key of user is used for unshared storage;
Third layer password key, password key is used for being encrypted protection to the public private key pair of user and master key.
This invention ensures that the fail safe being stored in third party's data, and owing to being all encryption in files passe and downloading process, so be all safe; By adopting the mode of complete client encryption and decryption to maintain secrecy to user data, thus ensure that the fail safe of user data; Have employed the completely transparent mode of operation of user, user is easy to use, does not need extra work can complete the object of file-sharing; Adopt multistage key, the feature taking full advantage of public and private key makes the file in shared system safer, and greatly reduces the complexity that cryptograph files shares method; Sharing without the need to carrying out re-encrypted in full by adopting the mode of a realizing one secrete key for one file and key reconsul encryption to make, under the condition ensureing certain fail safe, fundamentally reducing the amount of calculation of system; The encryption key distribution mode adopted makes user have and only has the control to oneself file, file is stored safer.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present invention provide based on third-party secure file storage and shared system structural representation;
Fig. 2 be the embodiment of the present invention provide based on third-party secure file storage and shared method flow diagram;
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The encryption that the present invention mainly comprises file is uploaded, the download decryption of file and ciphertext share operation, the encrypt and decrypt of its file operates in user side and completes, Cryptograph Sharing operating process comprises file key is got user side, file key is decrypted at user side and then re-starts to encrypt with the PKI of the other side and generate new file key, then be uploaded to service end store, when need use file time use oneself private key declassified document key so that again declassified document can obtain definitive document.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, mainly the comprising based on third-party secure file storage and shared system of the embodiment of the present invention: service end 1, user side 2;
For storing the service end 1 of third party's storing mechanism of data, and user terminal, be user side 2; Wherein, service end 1 mainly carries out the storage of user data, and namely it can accept the request of user side 2 and carry out deal with data by the requirement of user side 2, and he also exists the possibility of leak data simultaneously.
User side 2 is legitimate device that the owner of file holds, and it is the core job environment that user carries out file encryption deciphering and sharing operation, is safe concerning user.The generation of key and the encrypt and decrypt operation of file is carried out at user side 2.
In order to understand method in this enforcement example and process better, choose a Cryptograph Sharing process to be described in detail, the participant of this process mainly contains tripartite, comprising: user A (encryption can carrying out file is uploaded, file decryption is downloaded and file-sharing is initiated) and user B (encryption can carrying out file is uploaded, file decryption is downloaded and file-sharing receives) and the third-party platform mechanism for storing data; Wherein user A is the owner of shared file, and it has any right to the file that will share; User B is the recipient of shared file, conducts interviews to file when authorizing share through user A; Third-party platform mechanism is mainly used in storing the file data of user, and key information after encryption and user's registration information and respond user's request.
As shown in Figure 2, concrete steps of the invention process are as follows:
(1) system initialization
In order to realize sharing functionality, user A and user B needs to carry out initialization when login system first.Initialization procedure comprises:
1a) user enters register interface, provides username & password to register on request, and then user terminal system can generate according to log-on message the user password key meeting symmetric cryptographic key length requirement by hash function 1 at user side;
1b) user side can generate size by local function call in this locality is the secure random number of m, this random number is as the master key of user, wherein the size of m is determined the requirement of key length according to symmetric encipherment algorithm, meanwhile also generate the double secret key of the asymmetric encryption of user in this locality, its length is also determined by specific algorithm.
1c) user's master key of generation and private key for user are encrypted by password key, the key file of generating ciphertext state, this file are stored by being uploaded to third-party platform mechanism after coding, being stored in user's registration information list.
1d) PKI of generation is directly uploaded in user's registration information list, carries out storing thus completing registration.
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 get password key by carrying out Hash calculation to log-on message, by password key decruption key file, obtain user's master key and private key for user respectively after key file is resolved, and master key and private key are stored in user side.
(2) file encryption is uploaded
2a) user A selects to need to encrypt the file uploaded, and then by the random number of a user side stochastic generation safety, its length meets symmetric cryptographic key length, using this random number as file key;
2b) by using file key to be encrypted selected file, and encrypted result is buffered in this locality;
2c) file key is encrypted by user's master key, and the file key mode of being spliced by file after encryption is spliced to by step 2b) before file after encryption, form a new file, wherein front m byte is the file key after encryption, is the file content after encryption after m byte.
2d) encrypt file newly formed is uploaded to service end and stores by user A.
(3) Cryptograph Sharing
3a) first user A selects to need shared file in the memory space of oneself, it is shared for arranging file attribute, at this moment system can provide user the window inquired about, after user A inputs the user name of user B in window, whether user side automatically sends inquiry request and exists to service end inquiring user B, if user B exists, will return the PKI of a confirmation and user B;
3b) user A is by sending request the file key after the encryption obtaining current wanted shared file, and the file key of close for the current file stored in third-party platform mechanism state then can be sent to user A by third-party platform authorities after request;
After 3c) user A receives the file key of file, obtain the file key of the plaintext state of this file by being stored in local master key deciphering;
3d) by being used in step 3a) in the PKI of user B that gets file key is expressly encrypted, form the file key of Xinmi City's state, step 3d here) the cryptograph files key that generates only has user B just can be decrypted to get real file key, also thus ensure that the fail safe of shared file;
3e) user side of user A is encoded to character string by newly encrypting the key obtained by visual automatically, then the key after coding is uploaded to third-party platform mechanism, and in shared file information list, insert a record be used for storage key and relevant information;
3f) third-party platform mechanism carries out file mark according to shared file information list for user B, makes user B to see in the memory space of oneself and to identify shared file.
(4) file download deciphering
4a) user B selects the shared file that receives in the listed files of oneself, sends download request;
4b) according to download request, third-party platform mechanism judges whether this file is shared file, if the file key be stored in shared file information list is then sent to user B by shared file, the shared file of request is sent to user B simultaneously and carries out buffer memory, then perform step 4c; If not shared file then the direct file by request be sent to user B and be decrypted operation, thus obtain final file expressly.
4c) user side will use step 1c) in the private key for user that gets to 4b) in the file key that gets be decrypted, thus get file key, by using file key file be decrypted and get original document expressly.
(5) nullify
When service system needs to nullify, in order to security needs user side can remove the master key and the private key for user that are stored in user side automatically.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. one kind based on third-party secure file storage and shared system and method, it is characterized in that, described based on third-party secure file storage and shared system and the encryption of method to user side file is uploaded and user deciphers download file, when file needs shared, after encryption is uploaded, user file key is got user side, file key is decrypted at user side and then re-starts to encrypt with the PKI of the other side and generate new file key, then be uploaded to service end to store, use when the other side uses file private key declassified document key so that again declassified document obtain definitive document.
2. as claimed in claim 1 based on third-party secure file storage and shared system and method, it is characterized in that, describedly specifically to comprise the following steps based on third-party secure file storage and shared system and method:
Step one, system initialization:
User A and user B carries out initialization when login system first;
Namely user A and user B carries out login system after completing initialization, and landfall process is as follows:
Logging in system by user, automatic acquisition is stored in the key file of third party's storing mechanism by user side, and get password key by carrying out Hash calculation to log-on message, by password key decruption key file, obtain user's master key and private key for user respectively after key file is resolved, and master key and private key are stored in user side;
Step 2, file encryption is uploaded;
Step 3, Cryptograph Sharing;
Step 4, file download is deciphered;
Step 5, nullify:
When needs are nullified, user side can remove the master key and the private key for user that are stored in user side automatically.
3., as claimed in claim 2 based on third-party secure file storage and shared system and method, it is characterized in that, described in step one, initialization procedure comprises:
The first step, user enters register interface, provides username & password to register on request, and then user side can generate according to log-on message the user password key meeting symmetric cryptographic key length requirement by hash function at user side;
Second step, it is the secure random number of m that user side can generate size by local function call in this locality, random number is as the master key of user, the size of m is determined the requirement of key length according to symmetric encipherment algorithm, meanwhile also generates the double secret key of the asymmetric encryption of user in this locality;
3rd step, is encrypted user's master key of generation and private key for user by password key, the key file of generating ciphertext state, being stored by file, being stored in user's registration information list by being uploaded to third-party platform mechanism after coding;
4th step, is directly uploaded to the PKI of generation in user's registration information list, carries out storing thus completing registration.
4., as claimed in claim 2 based on third-party secure file storage and shared system and method, it is characterized in that, described in step 2, files passe process comprises:
The first step, user A selects to need to encrypt the file uploaded, and then by the random number of a user side stochastic generation safety, length meets symmetric cryptographic key length, using random number as file key;
Second step, by using file key to be encrypted selected file, and is buffered in this locality by encrypted result;
3rd step, file key is encrypted by user's master key, and before the file key after encryption is spliced to the file after being encrypted by second step by the mode that file splices, forms a new file, front m byte is the file key after encryption, is the file content after encryption after m byte;
4th step, the encrypt file newly formed is uploaded to service end and stores by user A.
5., as claimed in claim 2 based on third-party secure file storage and shared system and method, it is characterized in that, described in step 3, file-sharing specifically comprises:
The first step, first user A selects the file needing to share in the memory space of oneself, it is shared for arranging file attribute, the window that user inquires about is provided, after user A inputs the user name of user B in window, whether user side automatically sends inquiry request and exists to service end inquiring user B, if user B exists, will return the PKI of a confirmation and user B;
Second step, user A is by sending request the file key after the encryption obtaining current wanted shared file, and the file key of close for the current file stored in third-party platform mechanism state then can be sent to user A by third-party platform authorities after request;
3rd step, after user A receives the file key of file, obtains the file key of the plaintext state of file by being stored in local master key deciphering;
4th step, by using the PKI of the user B got in a first step to be encrypted file key expressly, forms the file key of Xinmi City's state;
5th step, the user side of user A is encoded to character string by newly encrypting the key obtained by visual automatically, then the key after coding is uploaded to third-party platform mechanism, and in shared file information list, insert a record be used for storage key and relevant information;
6th step, third-party platform mechanism carries out file mark according to shared file information list for user B, makes user B to see in the memory space of oneself and to identify shared file.
6., as claimed in claim 2 based on third-party secure file storage and shared system and method, it is characterized in that, described in step 4, file download specifically comprises:
The download decryption of shared file:
The first step, user B selects the shared file received in the listed files of oneself, sends download request;
Second step, according to download request, third-party platform mechanism judges whether this file is shared file, if the file key be stored in shared file information list is then sent to user B by shared file, the shared file of request is sent to user B simultaneously and carries out buffer memory;
3rd step, user side is decrypted using the private key for user got the file key got in second step, thus gets file key, file is decrypted to the original document getting plaintext by using file key;
The download decryption of unshared file:
The first step, user A or B selects the unshared file that need download, and sends download request;
Second step, according to download request, third-party platform mechanism judges whether this file is shared file, if not shared file, then the file of request is sent to user A or B and carries out buffer memory;
3rd step, user side obtains the file header of buffer memory, and deciphers header information by the master key of user, acquires file key expressly, is obtained the original document of plaintext, thus complete download by file key deciphering expressly.
7. based on third-party secure file storage and a shared system, it is characterized in that, describedly to comprise based on third-party secure file storage and shared system:
For storing the service end of third party's storing mechanism of data;
For carrying out file encryption deciphering and sharing operation, carry out the user side of the generation of key and the encrypt and decrypt operation of file.
8. as claimed in claim 7 based on third-party secure file storage and shared system, it is characterized in that, describedly use three layers of key based on third-party secure file storage and shared system;
Ground floor is file key, is used for being encrypted protection to file;
The second layer is the public and private key of user and master key, is encrypted protection when user's public private key pair is used for shared file to file key, the file key of encrypt file when the master key of user is used for unshared storage;
Third layer password key, password key is used for being encrypted protection to the public private key pair of user and master key.
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| CN110071799A (en) * | 2019-04-09 | 2019-07-30 | 山东超越数控电子股份有限公司 | A kind of generation guard method of encryption storage key, system, terminating machine and readable storage medium storing program for executing |
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| CN110300112B (en) * | 2019-07-02 | 2022-05-10 | 石家庄铁道大学 | Block chain key hierarchical management method |
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| CN111342961A (en) * | 2020-03-04 | 2020-06-26 | 贵州弈趣云创科技有限公司 | Method for realizing data cross-platform sharing by configuring key pair |
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| CN114205090A (en) * | 2021-11-30 | 2022-03-18 | 傲然技术有限公司 | Safe file sharing method and system based on state cryptographic algorithm |
| CN114205090B (en) * | 2021-11-30 | 2024-01-30 | 傲然技术有限公司 | Safe file sharing method and system based on cryptographic algorithm |
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