CN104834871A - Differentiating method for improving writing rate of hidden storage system - Google Patents
Differentiating method for improving writing rate of hidden storage system Download PDFInfo
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- CN104834871A CN104834871A CN201510238360.XA CN201510238360A CN104834871A CN 104834871 A CN104834871 A CN 104834871A CN 201510238360 A CN201510238360 A CN 201510238360A CN 104834871 A CN104834871 A CN 104834871A
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- confidential documents
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1458—Management of the backup or restore process
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2107—File encryption
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- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Databases & Information Systems (AREA)
- Quality & Reliability (AREA)
- Health & Medical Sciences (AREA)
- Bioethics (AREA)
- General Health & Medical Sciences (AREA)
- Computer Hardware Design (AREA)
- Computer Security & Cryptography (AREA)
- Software Systems (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
- Storage Device Security (AREA)
Abstract
The invention provides a differentiating method for improving writing rate of a hidden storage system. The differentiating method sequentially comprises the following steps of extracting confidential documents which are stored in an information hiding carrier in blocks; backing up the extracted confidential documents; operating the extracted confidential documents to form a new confidential document; differentiating the backup of the original confidential documents and the new confidential document by blocks, recording the different block, and finding the storage position of the different block in the information hiding carrier; writing the contents of the different block in the new confidential document into the corresponding storage position in the information hiding carrier. The differentiating method has the advantages that the writing rate of the hidden storage system is greatly improved, and the waiting time of user operation is shortened.
Description
Technical field
The present invention relates to Computer Applied Technology field, specifically a kind of difference method promoting hidden storage system writing rate.
Background technology
At present, occurred many operational hidden storage systems on the market, its advantage is confidential documents to be stored among some Covers of Information Hiding snugly.After carrying out Information hiding, Covers of Information Hiding still can keep original functional attributes substantially, and Information hiding is operated can not be realized by other people, realizes hidden storage.
Often there is the operation of three phases in hidden storage system: initial phase, extraction stage and write phase.Initialization often carries out disposable operation by producer, and user uses the extraction and the write that need often to carry out confidential documents during hidden storage system.Therefore, affecting user, to experience larger to hidden storage system be extraction stage and write phase.
But, for existing hidden storage system, when user needs to upgrade confidential documents, hidden storage system all needs the whole confidential documents of complete loading from Covers of Information Hiding, then the confidential documents after whole renewal is again hidden among Covers of Information Hiding.Such flow process length consuming time, efficiency are low.This shortcoming seems particularly outstanding when confidential documents is larger, considerably increase the stand-by period of user, reduces the experience fragrance of user.
Summary of the invention
The object of the present invention is to provide a kind of difference method promoting hidden storage system writing rate, the method can shorten the time that the confidential documents written information of renewal is hidden carrier by user greatly, and is easy to realize.
Technical scheme of the present invention is:
Promote a difference method for hidden storage system writing rate, the method comprises the step of following order:
(1) by piecemeal, the confidential documents be stored in Covers of Information Hiding extracts;
(2) confidential documents extracted is backed up;
(3) the new confidential documents of rear formation is operated to the confidential documents extracted;
(4) backup of former confidential documents and new confidential documents are carried out difference by block, record difference block also finds out difference block memory location corresponding in Covers of Information Hiding;
(5) content of difference block in new confidential documents is written to memory location corresponding in Covers of Information Hiding.
The difference method of the hidden storage system writing rate of described lifting, in described step (4), carries out difference by the backup of former confidential documents and new confidential documents by block, specifically comprises:
(41) backup of former confidential documents and new confidential documents is read with binary mode;
(42) according to the amount of capacity of hiding storage space each in Covers of Information Hiding, corresponding piecemeal is carried out to the backup of former confidential documents and new confidential documents, put on sequence number in order;
(43) comparison is one by one carried out in identical with the corresponding sequence number of new confidential documents to the backup of former confidential documents block step-by-step, if the scale-of-two of monoblock is not identical, is then difference block.
As shown from the above technical solution, rear to the confidential documents extracted from Covers of Information Hiding and the operation confidential documents upgraded is carried out difference by the present invention, the part changed is re-write in Covers of Information Hiding, unaltered part does not then operate, like this, the part at every turn re-writing Covers of Information Hiding is only the part of this operation change, and unaltered part does not then make an amendment, and greatly improves the writing rate of hidden storage system.Under normal circumstances, user uses hidden storage system, and major part just reference machine wants data, even if amendment, an also just little part, therefore, introduces difference algorithm and have certain practicality, greatly can improve writing rate.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention;
Fig. 2 is the method flow diagram of the specific embodiment of the invention;
Fig. 3 is the algorithm realization process flow diagram of the specific embodiment of the invention.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of difference method promoting hidden storage system writing rate, comprises the step of following order:
S1, extraction confidential documents (as virtual disk image file, being designated as old.img) from Covers of Information Hiding (as image library etc.);
S2, confidential documents to be backed up (being designated as old_clone.img);
S3, user operate confidential documents, and when after end of operation, former confidential documents (old.img) becomes new confidential documents (being designated as new.img);
S4, carry out difference by backing up (old_clone.img) and new confidential documents (new.img), the memory location that record difference block and difference block are corresponding in Covers of Information Hiding;
S5, the content of difference block in new confidential documents (new.img) is written to memory location corresponding in Covers of Information Hiding;
S6, write after, delete backup (old_clone.img) and new confidential documents (new.img), discharge storage space.
As shown in Figure 2 and Figure 3, the present invention is further illustrated for hidden USB flash disk.
The memory capacity supposing every pictures in USB flash disk image library is 2M, deposit image file old.img size be 20M, then old.img is divided into 10 pieces, and every block 2M is stored in each picture in image library.
The first step, extracts image file old.img from USB flash disk image library, preserves the generic storage space of a copy at PC or USB flash disk, is designated as old_clone.img;
Second step, after user completes the operation of image file old.img, forms new image file new.img, is saved in the generic storage space of PC or USB flash disk equally;
3rd step, reads old_clone.img and new.img with binary mode, and the size simultaneously can depositing capacity according to pictures every in picture library carries out corresponding piecemeal, old_clone.img and new.img is divided into 10 pieces, and every block 2M, puts on sequence number in order;
4th step, the block identical to the corresponding sequence number of old_clone.img and new.img carries out differential ratio to (step-by-step is comparison one by one), if the scale-of-two of monoblock is just the same, then think that this block does not change, the picture then preserving this block in original image storehouse does not just need to re-write, if not completely the same, even if only have one to change, also need this block content of the picture new.img of this block by preserving old_clone.img in original image storehouse to re-write, complete whole comparison then difference algorithm complete;
5th step, deletes old_clone.img and new.img from the generic storage space of PC or USB flash disk.
Because user can not use hidden USB flash disk significantly to revise its content at every turn, if just browse or slightly revise, then adopt difference algorithm significantly can improve the unloading efficiency of hidden USB flash disk, and every design of former hidden USB flash disk need not be revised, its original security is not destroyed yet, use flexibly, conveniently, successful.
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 (2)
1. promote a difference method for hidden storage system writing rate, it is characterized in that, the method comprises the step of following order:
(1) by piecemeal, the confidential documents be stored in Covers of Information Hiding extracts;
(2) confidential documents extracted is backed up;
(3) the new confidential documents of rear formation is operated to the confidential documents extracted;
(4) backup of former confidential documents and new confidential documents are carried out difference by block, record difference block also finds out difference block memory location corresponding in Covers of Information Hiding;
(5) content of difference block in new confidential documents is written to memory location corresponding in Covers of Information Hiding.
2. the difference method of the hidden storage system writing rate of lifting according to claim 1, is characterized in that, in described step (4), the backup of former confidential documents and new confidential documents is carried out difference by block, specifically comprises:
(41) backup of former confidential documents and new confidential documents is read with binary mode;
(42) according to the amount of capacity of hiding storage space each in Covers of Information Hiding, corresponding piecemeal is carried out to the backup of former confidential documents and new confidential documents, put on sequence number in order;
(43) comparison is one by one carried out in identical with the corresponding sequence number of new confidential documents to the backup of former confidential documents block step-by-step, if the scale-of-two of monoblock is not identical, is then difference block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510238360.XA CN104834871A (en) | 2015-05-12 | 2015-05-12 | Differentiating method for improving writing rate of hidden storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510238360.XA CN104834871A (en) | 2015-05-12 | 2015-05-12 | Differentiating method for improving writing rate of hidden storage system |
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| CN104834871A true CN104834871A (en) | 2015-08-12 |
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| CN201510238360.XA Pending CN104834871A (en) | 2015-05-12 | 2015-05-12 | Differentiating method for improving writing rate of hidden storage system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387976A (en) * | 2008-11-07 | 2009-03-18 | 清华大学 | Logical volume rapid synchronization method based on data differentia |
| CN101770515A (en) * | 2010-01-18 | 2010-07-07 | 杭州顺网科技股份有限公司 | Data block comparison based data updating method |
| CN103338376A (en) * | 2013-07-02 | 2013-10-02 | 中国科学技术大学 | Video steganography method based on motion vector |
| CN104200171A (en) * | 2014-08-20 | 2014-12-10 | 中国科学技术大学先进技术研究院 | Virtual file system based on information hiding |
-
2015
- 2015-05-12 CN CN201510238360.XA patent/CN104834871A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387976A (en) * | 2008-11-07 | 2009-03-18 | 清华大学 | Logical volume rapid synchronization method based on data differentia |
| CN101770515A (en) * | 2010-01-18 | 2010-07-07 | 杭州顺网科技股份有限公司 | Data block comparison based data updating method |
| CN103338376A (en) * | 2013-07-02 | 2013-10-02 | 中国科学技术大学 | Video steganography method based on motion vector |
| CN104200171A (en) * | 2014-08-20 | 2014-12-10 | 中国科学技术大学先进技术研究院 | Virtual file system based on information hiding |
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| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tian Hui Inventor after: Guo Yugang Inventor after: Cha Hongyue Inventor before: Tian Hui Inventor before: Guo Yugang Inventor before: Zhang Weiming Inventor before: Cha Hongyue Inventor before: Liu Kewei |
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Application publication date: 20150812 |
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| RJ01 | Rejection of invention patent application after publication |