CN103607393A - Data safety protection method based on data partitioning - Google Patents
Data safety protection method based on data partitioning Download PDFInfo
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Abstract
The invention provides a data safety protection method based on data partitioning. According to an employed strategy, different data needing storage at a client end are reasonably partitioned into great and small data blocks, and the great and small data blocks are respectively deployed in local and non-local cloud storage systems. Compared with the prior art, the data safety protection method based on data partitioning can effectively prevent a malicious user or a cloud storage administrator from carrying out illegal stealing and tampering of privacy data of users, provides more choices for safety of different data for users and has advantages of improved system flexibility, strong practicality and easy popularization.
Description
Technical field
The present invention relates to Computer Applied Technology field, specifically a kind of data security protection method based on Data Segmentation.
Background technology
In recent years, as the cloud service system data security of the companies such as Google leak data event and Microsoft, the Amazon event that is under suspicion, further aggravated industry to the Information Security of cloud application, reliability and credible worry; The core root of the problem of data safety of the existence in cloud storage system is that data management power is with proprietorial separated.Data under user are contracted out to cloud storage provider, and cloud storage provider has just obtained the priority access power of these data.Fact proved, owing to existing internal staff's dereliction of duty, assault and the system failure to cause the kinds of risks such as security mechanism inefficacy, cloud storage provider does not have sufficient evidence to allow user be sure of that its data are correctly stored and use.For example, whether user data is stolen and sold to its rival, whether user's data-privacy is extracted or analyzes, and user's data have country or the region that is not correctly stored in its appointment, and data do not have is strictly destroyed deletion etc. up hill and dale by customer requirements.
In present stage, in cloud storage system mainly there is the problem of following 3 aspects in the assurance policy mechanism of Information Security aspect:
1, the larger overhead that traditional cloud storage data-privacy security mechanism based on simple encryption technology is brought in actual process operation data and loaded down with trivial details, once and by hacker, cracked, data will be divulged a secret or lose;
The prestige of 2 ,Yun storage service providers and qualification cannot guarantee to allow user courageously relieved being put in the space that cloud storage provider provides that data are revealed the whole truth carry out data storage;
3, in cloud stores service, the storage of data need to be based on widely used Internet network, because data are stored transmission Network Based, the probability of being intercepted and captured in the process of transmission has also increased the risk of data.
Summary of the invention
Technical assignment of the present invention is to solve the deficiencies in the prior art, and a kind of data security protection method based on Data Segmentation is provided.
Technical scheme of the present invention realizes in the following manner, this kind of data security protection method based on Data Segmentation, and it specifically protects step to be:
One, cloud storage system is set, this cloud storage system comprises client and high in the clouds, and client is responsible for monitoring and is caught local system operation;
Two, user's uploading data: according to the distribution of main control server, physical equipment corresponding to data block deposit in, it specifically deposits step in and is:
The Data Segmentation that first in client, user need to be stored in cloud storage system is small data piece and long data block; Secondly in client, carry out Hash operation, then in this locality, preserve small data piece and cryptographic Hash, adopt the data encryption technology of varying strength to be encrypted; After finally long data block being encrypted according to the level of security demand of user's appointment, by Internet Internet Transmission, to the memory file system in high in the clouds, carry out piecemeal storage;
Three, user extracts data: the metadata information by inquiry main control server, extracts corresponding data block.
Described high in the clouds is divided into two parts: be first cloud storage control server, Control Server mainly carries out that data that registered user uploads are carried out piecemeal and metadata is processed operation, the request of data of client is authenticated and access control simultaneously; Next is cloud store storage server, and storage server system is mainly responsible for actual hosted data storage.
The small block data that the small data piece of cutting apart in described step 2 is fixed size, it is cut apart realization flow and is: first, produce the random number sequence between 0～N, N is file size, and sequence length equals the big or small N/10 of data; Secondly random number sequence is arranged from small to large, just obtained from file, extracting the position of byte; Finally the byte of correspondence position is split from original, preserve as small block data together with tactic random number sequence; File after divided is as chunk data.
The small data piece of cutting apart in described step 2 is the small block data of on-fixed size, and it is cut apart realization flow and is: first, and according to file size Lookup protocol random number range; Secondly, system produces one group and random number sequence in scope is set as extracting positional increment; Again, start to extract byte from fixed position, this position adds that random number obtains the next byte location that extracts, and extracting byte-sized is exactly the size of increment random number, until next byte location is greater than size of data to be uploaded; Finally, the byte of correspondence position is extracted from original, preserve as small block data together with tactic random number sequence; Residue file is as chunk data.
The detailed process of described step 2 is:
1) user logins by the cloud storage system of oneself, the data file that selection need to be uploaded;
2) file that will upload is carried out to Hash operation, calculate a value, the data of uploading are carried out to Data Segmentation according to size simultaneously;
3) cryptographic Hash generating and the small block data splitting are carried out to data storage in this locality;
4) data of needs being uploaded are encrypted and upload according to significance level;
5) in cloud storage system, there is main control server to carry out the piecemeal of data and the processing of metadata, have main control server to control, in the storage of the enterprising row data of distributed memory system.
The detailed process of described step 3 is:
1) user, by username and password logon server, selects to need the file of download;
2) cloud storage system divides block message, metadata and data block memory location according to sign to main control server data query;
3) according to data block, divide block message and memory location, from distributed storage server, take out all data blocks, according to partition strategy, data block is merged into chunk data;
4) desired data is downloaded to this locality, the encryption policy while uploading at that time according to data is decrypted;
5) from this locality, take out the small block data of preserving, splice with chunk data, obtain original, and verification of data integrity.
The beneficial effect that the present invention compared with prior art produced is:
A kind of data security protection method based on Data Segmentation of the present invention adopts the data that the difference of client need to be preserved to be rationally divided into size data piece, respectively small block data and chunk data are deployed in again to the strategy in the cloud storage system of local and remote side, solved larger overhead that traditional cloud storage data-privacy security mechanism based on simple encryption technology brings in actual process operation data and loaded down with trivial details, can effectively prevent that malicious user or cloud storage administrator from illegally stealing, distorting user's private data; Design consideration of the present invention will be stored the different level of security demands of data, the fixed-size fritter technology of selection that can be in good time or big or small unfixed fritter technology, for client provides more choices for the fail safe of different pieces of information, improved the flexibility of system; The present invention proposes to give the invention of data-splitting strategy; can provide a kind of low expense of client, data security secret protection technology in the cloud storage system of high safety for user; realize user and really oneself grasped the storage scheme of data security in cloud storage system; practical; applied widely, be easy to promote.
Accompanying drawing explanation
Accompanying drawing 1 is data upload flow chart in cloud storage system of the present invention.
Accompanying drawing 2 is that in cloud storage system of the present invention, data are extracted flow chart.
Accompanying drawing 3 is the small block data schematic flow sheets that extract fixed size in the present invention.
Accompanying drawing 4 is the small block data schematic flow sheets that extract on-fixed size in the present invention.
Embodiment
Below in conjunction with accompanying drawing, a kind of data security protection method based on Data Segmentation of the present invention is described in detail below.
As shown in accompanying drawing 2, Fig. 3, the invention provides a kind of data security protection method based on Data Segmentation, it specifically protects step to be:
One, cloud storage system is set, this cloud storage system comprises client and high in the clouds, and client is responsible for monitoring and is caught local system operation;
Two, the user who has bought cloud stores service can use cloud storage system to carry out the storage of data.When the user of client need to carry out data upload, carry out Request System and carry out data when storage, according to the distribution of main control server, physical equipment corresponding to data block deposit in, it specifically deposits step in and is:
At user side, it is FTP client FTP, FTP client FTP is responsible for monitoring and is caught local system operation, data to the needs storage obtaining are carried out large and small cutting apart, carry out Hash operation (Hash), then in this locality, preserve small data piece and cryptographic Hash, adopt the data encryption technology of varying strength to be encrypted.Being divided into beyond the clouds two parts, is first cloud storage control server, and Control Server mainly carries out that data that registered user uploads are carried out piecemeal and metadata is processed operation, the request of data of client is authenticated and access control simultaneously.Next is cloud store storage server, and storage server system is mainly responsible for actual hosted data storage.
Three, user extracts data: the metadata information by inquiry main control server, extracts corresponding data block.
Security mechanism based on Data Segmentation in the present invention can resolve into n piecemeal by a file, possess wherein arbitrarily at least k(k≤n completely) during individual piecemeal, could recover original, when this method for designing makes any n-k minute lost block or damages, still can recover original, thereby improve the reliabilty and availability of data; And when any not enough k piecemeal is stolen, can not be reduced into original, thereby have improved fail safe.Data Segmentation mechanism is in the present invention that after data file is divided into large and small data block, store in strange land, stores long data block in cloud storage system, at this locality storage small data piece, according to the size of data block, can be divided into two kinds of strategies.
(1) as shown in Figure 3, the small block data that the small data piece of cutting apart in described step 2 is fixed size, it is cut apart realization flow and is: first, produce the random number sequence between 0～N, N is file size, and sequence length equals the big or small N/10 of data; Secondly random number sequence is arranged from small to large, just obtained from file, extracting the position of byte; Finally the byte of correspondence position is split from original, preserve as small block data together with tactic random number sequence; File after divided is as chunk data.This tactful advantage is that small block data size is fixing, and the pressure that can not bring user side storage or read-write to process, is convenient to local storage administration.
(2) as shown in Figure 4, the small data piece of cutting apart in described step 2 is the small block data of on-fixed size, and it is cut apart realization flow and is: first, and according to file size Lookup protocol random number range; Secondly, system produces one group and random number sequence in scope is set as extracting positional increment; Again, start to extract byte from fixed position, this position adds that random number obtains the next byte location that extracts, and extracting byte-sized is exactly the size of increment random number, until next byte location is greater than size of data to be uploaded; Finally, the byte of correspondence position is extracted from original, preserve as small block data together with tactic random number sequence; Residue file is as chunk data.The byte location that such Data Segmentation scheme extracts is more even; According to predefined according to file size Lookup protocol random number range, be an emphasis of this strategy.
As shown in Figure 1, the detailed process of described step 2 is:
1) user logins by the cloud storage system of oneself, the data file that selection need to be uploaded.
2) file that will upload is carried out to Hash operation, calculate a value, the data of uploading are carried out to Data Segmentation according to size simultaneously.
3) cryptographic Hash generating and the small block data splitting are carried out to data storage in this locality.
4) data of needs being uploaded are encrypted and upload according to significance level.
5) in cloud storage system, there is main control server to carry out the piecemeal of data and the processing of metadata, have main control server to control, in the storage of the enterprising row data of distributed memory system.
As shown in Figure 2, the detailed process of described step 3 is:
1) user, by username and password logon server, selects to need the file of download;
2) cloud storage system divides block message, metadata and data block memory location according to sign to main control server data query;
3) according to data block, divide block message and memory location, from distributed storage server, take out all data blocks, according to partition strategy, data block is merged into chunk data;
4) desired data is downloaded to this locality, the encryption policy while uploading at that time according to data is decrypted;
5) from this locality, take out the small block data of preserving, splice with chunk data, obtain original, and verification of data integrity.
By the method, the present invention can effectively prevent that malicious user or cloud storage administrator from illegally stealing, distorting user's private data, for user provides a kind of low expense of client, data security privacy protection policy in the cloud storage system of high safety.
The foregoing is only embodiments of the invention, within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. the data security protection method based on Data Segmentation, is characterized in that its concrete protection step is:
One, cloud storage system is set, this cloud storage system comprises client and high in the clouds, and client is responsible for monitoring and is caught local system operation;
Two, user's uploading data: according to the distribution of main control server, physical equipment corresponding to data block deposit in, it specifically deposits step in and is:
The Data Segmentation that first in client, user need to be stored in cloud storage system is small data piece and long data block; Secondly in client, carry out Hash operation, then in this locality, preserve small data piece and cryptographic Hash, adopt the data encryption technology of varying strength to be encrypted; After finally long data block being encrypted according to the level of security demand of user's appointment, by Internet Internet Transmission, to the memory file system in high in the clouds, carry out piecemeal storage;
Three, user extracts data: the metadata information by inquiry main control server, extracts corresponding data block.
2. a kind of data security protection method based on Data Segmentation according to claim 1, it is characterized in that: described high in the clouds is divided into two parts: be first cloud storage control server, Control Server mainly carries out that data that registered user uploads are carried out piecemeal and metadata is processed operation, the request of data of client is authenticated and access control simultaneously; Next is cloud store storage server, and storage server system is mainly responsible for actual hosted data storage.
3. a kind of data security protection method based on Data Segmentation according to claim 2, it is characterized in that: the small block data that the small data piece of cutting apart in described step 2 is fixed size, it cuts apart realization flow: first, produce the random number sequence between 0～N, N is file size, and sequence length equals the big or small N/10 of data; Secondly random number sequence is arranged from small to large, just obtained from file, extracting the position of byte; Finally the byte of correspondence position is split from original, preserve as small block data together with tactic random number sequence; File after divided is as chunk data.
4. a kind of data security protection method based on Data Segmentation according to claim 2, it is characterized in that: the small data piece of cutting apart in described step 2 is the small block data of on-fixed size, it cuts apart realization flow: first, and according to file size Lookup protocol random number range; Secondly, system produces one group and random number sequence in scope is set as extracting positional increment; Again, start to extract byte from fixed position, this position adds that random number obtains the next byte location that extracts, and extracting byte-sized is exactly the size of increment random number, until next byte location is greater than size of data to be uploaded; Finally, the byte of correspondence position is extracted from original, preserve as small block data together with tactic random number sequence; Residue file is as chunk data.
5. according to a kind of data security protection method based on Data Segmentation described in claim 3 or 4, it is characterized in that: the detailed process of described step 2 is:
1) user logins by the cloud storage system of oneself, the data file that selection need to be uploaded;
2) file that will upload is carried out to Hash operation, calculate a value, the data of uploading are carried out to Data Segmentation according to size simultaneously;
3) cryptographic Hash generating and the small block data splitting are carried out to data storage in this locality;
4) data of needs being uploaded are encrypted and upload according to significance level;
5) in cloud storage system, there is main control server to carry out the piecemeal of data and the processing of metadata, have main control server to control, in the storage of the enterprising row data of distributed memory system.
6. according to a kind of data security protection method based on Data Segmentation described in claim 3 or 4, it is characterized in that: the detailed process of described step 3 is:
1) user, by username and password logon server, selects to need the file of download;
2) cloud storage system divides block message, metadata and data block memory location according to sign to main control server data query;
3) according to data block, divide block message and memory location, from distributed storage server, take out all data blocks, according to partition strategy, data block is merged into chunk data;
4) desired data is downloaded to this locality, the encryption policy while uploading at that time according to data is decrypted;
5) from this locality, take out the small block data of preserving, splice with chunk data, obtain original, and verification of data integrity.
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