CN104850506A - Hidden file management system based on steganography - Google Patents
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Abstract
The invention provides a hidden file management system based on steganography. The hidden file management system based on steganography comprises a storage space integration unit and an operation unit, wherein the storage space integration unit is used for abstracting storage space of a carrier file library into continuous storage space formed by splicing a plurality of data blocks; and the operation unit is used for formatting, storing, extracting and deleting files. A safe data storage mode is implemented, scattered storage spaces in a carrier file are integrated, and the hidden file management system is apparent to users, and is convenient to operate and high in portability.
Description
Technical field
The present invention relates to steganography field, data storage security technical field, specifically a kind of hidden file management system based on Steganography.
Background technology
Occurred the various memory storage for storing data or system at present, the safety problem simultaneously storing data more and more comes into one's own.A kind of conventional data security methods is encrypted data, and by key storage in memory storage or host apparatus.As long as the shortcoming of the method is to obtain key, just all data can be decoded.
The technology of improvement is by the image watermarking in memory storage, thus the safety of protected data.The main stream approach realizing this technology is at present the instruction of interception system to file access, and filters the sensitive document that user specifies thus reach the effect of hidden file.The defect of the method is that data realize hiding by " filtration ", and data are still stored directly among hardware, if obtain this hardware, may recover the file be hidden.
Steganography is as a branch of Information hiding; message or file can be embedded bearer documents (picture; document; video, voice etc.) in, so directly store within hardware be the data of carrier picture and non-user; reach the object of hidden file; even if hardware is stolen, stealer also can only recover to obtain bearer documents and can not obtain hiding data wherein, thus protects the data security of user.
By image latent writing technology, bearer documents can provide a certain amount of storage space, but the embedding capacity that single carrier file can provide very little (picture of the bmp form of such as 1M can provide the memory capacity of 0.3M), therefore, be necessary that designing a kind of file management system integrates to obtain considerable storage space by the memory capacity of these " dispersions " and carry out conveniently the storage space after integrating, effectively manage.
Summary of the invention
The object of the present invention is to provide a kind of hidden file management system based on Steganography, the scattered storage space in bearer documents storehouse can integrate by this system carries out unified management.
Technical scheme of the present invention is:
Based on a hidden file management system for Steganography, this system comprises storage space integral unit and operating unit;
Described storage space integral unit, for by abstract for the storage space in bearer documents storehouse be the Coutinuous store space that is spliced by several data blocks, and the deviation post in its corresponding bearer documents, for variable, sets up the annexation between data block and bearer documents with the absolute path of each bearer documents in described bearer documents storehouse and each data block;
Described operating unit, for providing various operation, comprising data block that is space formatted for described Coutinuous store, that file to be stored is write described Coutinuous store space and being read from the data block in described Coutinuous store space by file to be extracted.
The described hidden file management system based on Steganography, described operating unit comprises format manipulation unit, file storage unit and file extraction unit;
Described format manipulation unit, for being reserved area, bulk state district and data field by described Coutinuous store spatial division, described bulk state district is made up of several bulk state list items, data block one_to_one corresponding in each bulk state list item and data field, the information that described bulk state list item is used for mark data block and the information stored needed for locating file;
Described file storage unit, for distributing data block for file to be stored or catalogue, if to be stored is catalogue, then the data block of distributing for it is reset, if to be stored is file, then the content-data of file is write the data block of distributing for it, namely the bulk state list item corresponding with data block is found from bulk state district, according to the absolute path of the corresponding bearer documents of the data block of bulk state list item mark, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted, according to the deviation post of data block in its corresponding bearer documents of bulk state list item mark, data to be written are carried out replacement with the data extracted merge, data after merging write in corresponding bearer documents by recycling steganography embedded mobile GIS,
Described file extraction unit, for determining the data block that file to be extracted takies, the content-data of file to be extracted is read from the data block that it takies, namely the bulk state list item corresponding with data block is found from bulk state district, according to the absolute path of the corresponding bearer documents of the data block of bulk state list item mark, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted, again according to the deviation post of data block in its corresponding bearer documents of bulk state list item mark, read the data of respective offsets position.
The described hidden file management system based on Steganography, described file storage unit comprises file header generation unit, parent directory positioning unit, data block allocation unit and file header storage unit;
Described file header generation unit, for the essential information spanned file head according to file to be stored or catalogue, described file header, for recording the essential information of file to be stored or catalogue, comprises filename, file size, file content initial data block number;
Described parent directory positioning unit, for being that root node builds directory tree with root directory, searching for the parent directory of file to be stored or catalogue, obtaining the data block that parent directory is corresponding in directory tree;
Described data block allocation unit, for distributing data block for file to be stored or catalogue, if to be stored is catalogue, then for it distributes a data block, if to be stored is file, then calculates the number of desired data block according to the size of file, and distribute corresponding data block for it, if the number of data block is two or more, then in the bulk state list item that previous data block is corresponding, write the bulk state list item numbering that next data block is corresponding;
Described file header storage unit, if for be stored be catalogue, it is then the data block numbering of distributing by file content initial data block number assignment, if what store is file, be then first the data block number distributed by file content initial data block number assignment, then file header write in data block corresponding to the parent directory of file to be stored or catalogue.
Beneficial effect of the present invention is:
(1) provide a kind of safer data storage method: by image watermarking in bearer documents storehouse, stronger protection can be provided for data;
(2) scattered in integration vector file storage space: the storage space that each bearer documents can provide is very little, scattered storage space is integrated into Coutinuous store space by the present invention;
(3) to user transparent: system of the present invention is based upon on operating system, user can use system of the present invention, handled easily as using usual file management system;
(4) transplantability is strong: system of the present invention does not also rely on certain operating system, can apply in any one operating system.
(5) extensibility: can conveniently realize the various application relevant to steganography based on native system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the relation schematic diagram of bearer documents and data block;
Fig. 3 is that bearer documents storehouse is abstract in Coutinuous store space schematic diagram;
Fig. 4 is the one-piece construction in Coutinuous store space;
Fig. 5 is file/catalogue Stored Procedure figure.
Embodiment
the present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of hidden file management system based on Steganography, comprises storage space integral unit 1, format manipulation unit 2, file storage unit 3 and file extraction unit 4;
Storage space integral unit 1, for by abstract for the storage space in bearer documents storehouse be the Coutinuous store space that is spliced by several data blocks, and the deviation post in its corresponding bearer documents, for variable, sets up the annexation between data block and bearer documents with the absolute path of bearer documents each in bearer documents storehouse and each data block;
Format manipulation unit 2, for being reserved area, bulk state district and data field by Coutinuous store spatial division, bulk state district is made up of several bulk state list items, data block one_to_one corresponding in each bulk state list item and data field, the information that bulk state list item is used for mark data block and the information stored needed for locating file;
File storage unit 3, for distributing data block for file to be stored or catalogue, if to be stored is catalogue, then the data block of distributing for it is reset, if to be stored is file, then the content-data of file is write the data block of distributing for it, namely the bulk state list item corresponding with data block is found from bulk state district, according to the absolute path of the corresponding bearer documents of the data block of bulk state list item mark, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted, according to the deviation post of data block in its corresponding bearer documents of bulk state list item mark, data to be written are carried out replacement with the data extracted merge, data after merging write in corresponding bearer documents by recycling steganography embedded mobile GIS,
File extraction unit 4, for determining the data block that file to be extracted takies, the content-data of file to be extracted is read from the data block that it takies, namely the bulk state list item corresponding with data block is found from bulk state district, according to the absolute path of the corresponding bearer documents of the data block of bulk state list item mark, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted, again according to the deviation post of data block in its corresponding bearer documents of bulk state list item mark, read the data of respective offsets position.
Bearer documents can be the various carriers such as picture, text, video, audio frequency.
Principle of work of the present invention:
S1, by abstract for bearer documents storehouse be Coutinuous store space:
In order to the storage space after management integration more easily, the present invention introduces the concept of " data block ", and data block is storage unit minimum in the file management system that describes of the present invention.As shown in Figure 2, from the angle stored, bearer documents is conceptualized as n data block (namely utilize steganography, bearer documents can embed the data of n data block size), and the storage space that bearer documents can provide is this n data block size sum.Such as, if the size of data block is 0.1M, so the bearer documents of the bmp form of 1M can be conceptualized as 3 data blocks.Like this, each bearer documents can provide size to be the Coutinuous store space of n data block.
The memory capacity that can provide due to single carrier file is limited, so be stitched together by the storage space that single carrier file provides define larger storage space, as shown in Figure 3.Like this, bearer documents storehouse is just conceptualized as one section of continuous print storage space, and the corresponding bearer documents of each data block, the storage space that bearer documents storehouse can provide is the storage space sum of each bearer documents.
Being stored in bearer documents because the data in data block are actually, in order to complete the accessing operation of file, needing to connect between data block and bearer documents.Here, Two Variables is introduced: one is the pointer (being the absolute path of bearer documents in the present invention) pointing to bearer documents; It two is the deviation post of data block in bearer documents.Use the data storage location that above-mentioned Two Variables just can uniquely be determined in each data block.
S2, format manipulation is carried out according to function in Coutinuous store space:
In order to more effectively manage Coutinuous store space, the present invention is divided into three parts: reserved area, bulk state district and data field, as shown in Figure 4.
Reserved area needs to be stored in the bearer documents namely fixed fixing position, its major function is the essential information of the file management system that minute book invention describes, the size etc. of the total volume that can use as creation-time, user and active volume, data block, and the number in bulk state district and the entry address of entry address and data field are provided, as shown in table 1.
Bulk state district is that the data block in data field provides an overall description, and bulk state district is made up of bulk state list item, and each list item corresponds to a data block in data field, and by automatically from 0 numbering.As shown in table 2, bulk state list item has two major functions: the using state of first mark corresponding data block (distribute/unallocated); It two is the information stored required for locating file, namely when the file of user or catalogue need the storage space of more than one data block, describes how to find other data block.
The function of data field is the data of storage file and catalogue, the data block in data field automatically from 0 open numbering and with the list item one_to_one corresponding bulk state district, the data block that acquiescence is numbered 0 stores the information of root directory.
Each file in the file management system that the present invention describes and catalogue are assigned with one " file header " (catalogue is used as a kind of special file), as shown in table 3, file header have recorded the information such as filename, size, content initial data block number, wherein root directory is when system is set up by system creation, and all the other catalogues in use create by user.
Table 1. reserved area
| Byte offset | Byte number | Implication |
| 0x00～0x07 | 8 | System version number |
| 0x08～0x09 | 2 | The size (KB) of data block |
| 0x0A～0x0F | 6 | Overall system capacity (block) |
| 0x10～0x15 | 6 | System active volume (block) |
| 0x16～0x17 | 2 | The number in bulk state district |
| 0x18～0x1F | 8 | The address in bulk state district 1 |
| 0x20～0x27 | 8 | The address in bulk state district 2 |
| 0x28～0x2F | 8 | The address in bulk state district 3 |
| 0x30～0x38 | 8 | The entry address of data field |
Specific explanations:
(1) reserved area is fixed size (56 byte), adopts special scheme to store and is stored in a fixing bearer documents by the data of reserved area;
(2) system version number: as DH-VFS1.0;
(3) address format in bulk state district is bulk state list item, as shown in table 2;
(4) the entry address form of data field is bulk state list item, as shown in table 2.
Table 2. bulk state list item
| Byte offset | Byte number | Implication |
| 0x00～0x00 | 1 | Zone bit and offset address |
| 0x01～0x0F | 15 | The bulk state list item numbering of next data block |
| 0x10～0x1F | 16 | The bearer documents address of corresponding data block |
Specific explanations:
(1) each bulk state district takies the size of a data block;
(2) each list item corresponds to a data block in data field;
(3) 0x00 ~ 0x00: this byte is divided into two parts, first three bit is zone bit, and rear five bits are offset address
0 ~ 2bits:0x00 represents that corresponding data block is unallocated, and 0x01 represents that corresponding data block has been distributed and the file of correspondence only employs this data block, and 0x02 represents that corresponding data block has been distributed and the file of correspondence employs other data blocks;
3 ~ 7bits: the deviation post of data block in bearer documents (bearer documents may comprise several data blocks);
(4) 0x01 ~ 0x0F: if the zone bit of first character joint is the data invalid of 0x00 or 0x01, this part; If first character joint zone bit be 0x02, this part be next data block corresponding bulk state list item numbering (some file may be stored in some non-conterminous data blocks, and this part plays the effect of connection two data blocks).
(5) 0x10 ~ 0x1F: this part is the bearer documents address of bulk state list item corresponding data block and the absolute path of bearer documents.
Table 3. file header
| Byte offset | Byte number | Implication |
| 0x00～0x00 | 1 | File status |
| 0x01～0x0B | 11 | Filename |
| 0x0C～0x13 | 9 | File size (block) |
| 0x14～0x15 | 2 | File content initial data block number |
| 0x16～0x16 | 1 | File attribute |
| 0x17～0x18 | 2 | Time Created (Hour Minute Second) |
| 0x19～0x1B | 2 | Building maths modec |
| 0x1C～0x1D | 2 | Finally access the date |
| 0x1E～0x1F | 2 | Finally revise the date |
Specific explanations:
(1) size of file header is 32 bytes;
(2) root directory is stored in 0 number block of data field;
(3) file status: mark file corresponding to this file header or whether catalogue is deleted;
(4) size of filename can not more than 11 bytes;
(5) file size can not more than 2
9individual data block;
(6) file attribute: 0x00 represents catalogue, 0x01 represents read-only, and 0x02 represents hiding, and 0x03 represents system file;
(7) Time Created: 0 ~ 4bits is in units of two seconds, and effective value is 0 ~ 29, and the value of expression is 0 ~ 58 second, 5 ~ 10bits for point, to be 0 ~ 58,11 ~ 15bits be effective value hour 0 ~ 23.
S3, file Stored Procedure:
(1) system initialization: by the Data import in reserved area and bulk state district in tag memory.
(2) judge that whether storage space is enough: judge that whether storage space is enough according to the active volume of reserved area and the size of file to be stored.
(3) spanned file head: according to the essential information spanned file head of file, notices that now file content initial data block number is unascertainable.
(4) parent directory is located: no matter be storage file or catalogue, all need the data block of locating its parent directory place; First find the position (0 number block of data field) of root directory, be that root node builds directory tree with root directory, in directory tree, search for the parent directory of file to be stored/catalogue, obtain the data block that parent directory is corresponding;
Wherein, be that root node builds directory tree with root directory, building process is as follows:
File headers all in a, extraction root directory, each file header adds in directory tree as a node;
If what b file header was corresponding is file, then this node is leaf node, if file header corresponding be catalogue, then need the sub-directory recursively traveling through this catalogue, until all catalogues are all added in directory tree.
(5) data block is distributed: be catalogue if to be stored, then for this catalogue distributes a data block; If to be stored is file, then needs the number calculating desired data block according to the size of file, and distribute data block for it;
The process of distributing is as follows: the bulk state list item in traversal bulk state district, the data block adopting optimal allocation decision search not to be assigned with, finds enough continuous spaces to avoid its fragmentation as much as possible when so-called optimal allocation strategy is file allocation storage space.
(6) " file content initial data block number " assignment is then the data block numbering of distributing by storage file head: be catalogue if to be stored; If to be stored is file, be then first the data block number distributed by " file content initial data block number " assignment; Then, writing in files head in the data block that parent directory is corresponding, if the data in parent directory are full, then needs for parent directory redistributes a data block.
(7) data block resets: be catalogue if to be stored, by the data block clearing distributed for it;
Storage file content-data: write in the data block of distributing for it by file content data, if be two or more data block, then writes the bulk state list item numbering that next data block is corresponding in the bulk state list item that previous data block is corresponding;
Wherein, the process to data block write data is as follows:
Numbering according to data block obtains corresponding bulk state list item from bulk state district, thus obtains the absolute path of corresponding bearer documents and the deviation post of data block of data block; According to the absolute path of corresponding bearer documents, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted; According to the deviation post of data block, carry out data to be written and the data extracted to merge the data of namely replacing respective offsets position in the corresponding bearer documents extracted by data to be written, the data after merging write in corresponding bearer documents by recycling steganography embedded mobile GIS.
(8) terminate: upgrade the essential information (active volume etc.) about system in reserved area.
S4, file extract flow process:
(1) viewing files head: be first that root node builds directory tree (process is the same) with root directory, search for the file header of file to be extracted in directory tree, thus obtain file content initial data block number; Obtain the bulk state list item of initial data block according to initial data block number from bulk state district, and then be defined as the data block of this file allocation;
(2) extraction document content-data: read from the data block of distributing for it by file content data, detailed process is as follows:
Numbering according to data block obtains corresponding bulk state list item from bulk state district, thus obtains the absolute path of corresponding bearer documents and the deviation post of data block of data block; According to the absolute path of corresponding bearer documents, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted; Again according to the deviation post of data block, read corresponding file content data.
The above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (3)
1. based on a hidden file management system for Steganography, it is characterized in that: this system comprises storage space integral unit and operating unit;
Described storage space integral unit, for by abstract for the storage space in bearer documents storehouse be the Coutinuous store space that is spliced by several data blocks, and the deviation post in its corresponding bearer documents, for variable, sets up the annexation between data block and bearer documents with the absolute path of each bearer documents in described bearer documents storehouse and each data block;
Described operating unit, for providing various operation, comprising data block that is space formatted for described Coutinuous store, that file to be stored is write described Coutinuous store space and being read from the data block in described Coutinuous store space by file to be extracted.
2. the hidden file management system based on Steganography according to claim 1, is characterized in that: described operating unit comprises format manipulation unit, file storage unit and file extraction unit;
Described format manipulation unit, for being reserved area, bulk state district and data field by described Coutinuous store spatial division, described bulk state district is made up of several bulk state list items, data block one_to_one corresponding in each bulk state list item and data field, the information that described bulk state list item is used for mark data block and the information stored needed for locating file;
Described file storage unit, for distributing data block for file to be stored or catalogue, if to be stored is catalogue, then the data block of distributing for it is reset, if to be stored is file, then the content-data of file is write the data block of distributing for it, namely the bulk state list item corresponding with data block is found from bulk state district, according to the absolute path of the corresponding bearer documents of the data block of bulk state list item mark, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted, according to the deviation post of data block in its corresponding bearer documents of bulk state list item mark, data to be written are carried out replacement with the data extracted merge, data after merging write in corresponding bearer documents by recycling steganography embedded mobile GIS,
Described file extraction unit, for determining the data block that file to be extracted takies, the content-data of file to be extracted is read from the data block that it takies, namely the bulk state list item corresponding with data block is found from bulk state district, according to the absolute path of the corresponding bearer documents of the data block of bulk state list item mark, steganography extraction algorithm is utilized the data in corresponding bearer documents to be extracted, again according to the deviation post of data block in its corresponding bearer documents of bulk state list item mark, read the data of respective offsets position.
3. the hidden file management system based on Steganography according to claim 2, is characterized in that: described file storage unit comprises file header generation unit, parent directory positioning unit, data block allocation unit and file header storage unit;
Described file header generation unit, for the essential information spanned file head according to file to be stored or catalogue, described file header, for recording the essential information of file to be stored or catalogue, comprises filename, file size, file content initial data block number;
Described parent directory positioning unit, for being that root node builds directory tree with root directory, searching for the parent directory of file to be stored or catalogue, obtaining the data block that parent directory is corresponding in directory tree;
Described data block allocation unit, for distributing data block for file to be stored or catalogue, if to be stored is catalogue, then for it distributes a data block, if to be stored is file, then calculates the number of desired data block according to the size of file, and distribute corresponding data block for it, if the number of data block is two or more, then in the bulk state list item that previous data block is corresponding, write the bulk state list item numbering that next data block is corresponding;
Described file header storage unit, if for be stored be catalogue, it is then the data block numbering of distributing by file content initial data block number assignment, if what store is file, be then first the data block number distributed by file content initial data block number assignment, then file header write in data block corresponding to the parent directory of file to be stored or catalogue.
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