CN104794025B - The method of rapid verification storage device - Google Patents
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- CN104794025B CN104794025B CN201510204245.0A CN201510204245A CN104794025B CN 104794025 B CN104794025 B CN 104794025B CN 201510204245 A CN201510204245 A CN 201510204245A CN 104794025 B CN104794025 B CN 104794025B
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Abstract
The invention discloses a kind of method of rapid verification storage device, belong to electronic evidence-collecting data and save field from damage, comprise the following steps：S1. each parameter information of storage device, including specific data structure are parsed；S2. judge whether the data structure of storage device is specific data structure, if it is skips to S3, otherwise skips to S5 according to the S1 parameter informations parsed.Beneficial effects of the present invention are as follows：The present invention is using segmentation check algorithm, only need to extract the value and deviation post in the MBR of storage device, partition boot record, root, whole subdirectory items and other all meta data file regions when saving the disk for having specific data structure from damage, therefore storage device data is largely saved from damage, the validity and reliability of electronic evidence has been ensured, and the purpose of rapid verification storage device can be reached.
Description
Technical field
The invention belongs to electronic evidence-collecting data to save field from damage, and in particular to a kind of method of rapid verification storage device.
Background technology
Electronic evidence-collecting is also known as computer forensics or computor method medical science, be study how to computer, network intrusions with
The science and technology that the evidence of crime is obtained, saved from damage, analyzed and shown.With the extensive use and popularization of computer, utilize
Cyber-net or crime using cyber-net as tool target are becoming increasingly rampant, and electronic evidence-collecting can be in strike and right
Resist in this kind digitlization process of commission of crime and play critical effect.
Electronic data is saved from damage, and to follow common evidence saves rule from damage.The particularity of electronic data makes its security method
With particularity, it is mainly reflected in notarization and saves from damage.The instantaneity and fugitiveness of electronic data are saved from damage to electronic data notarization
Program proposes higher requirement.With the further development of electronic technology, the notarization of future electronic data is saved from damage and can built
Based on network notarization center, a set of separate procedure saved from damage different from traditional evidence notarization is developed.
At home, about computer forensics in terms of research and practice it is mostly be using some external conventional forensic tools,
Also lacking more in-depth study in the flow of computer forensics, the preservation system and method for evidence are also perfect not to the utmost, so as to
The reliability, validity, confidence level for causing Computer forensics be not high.
The full name of MD5 algorithms is Message-Digest algorithm 5, is a kind of based on producing digital signature
The widely used hash algorithm in calculation machine security fields.Its effect is to allow Large Copacity information to be signed with digital signature software
A kind of form of secrecy is ' compressed ' into before private key, i.e., it is " byte serial " of a random length is irreversible by one
Character string converts algorithmic transformation into the string of one 128.The principle of MD5 algorithms be to input information carry out initialization process after,
It is grouped with 512 to handle input information, each group of subgroup for being divided into 16 32 again, by a series of change
After changing processing, four 32 packets of output, then the hashed value for one 128 being generated after this four 32 packet concatenations.Use
MD5 algorithms can effectively prevent information to be tampered, forge detecting the integrality of data and palm off, to ensure the number of storage device
According in censorship, completely consistent and data are effectively reliable.
However, in actual applications, with the huge expansion of company information and data, the problem of this method is exposed, is
The complexity of reduction and the data management of efficiency, but the importance for saving data from damage has irreplaceable importance, needs badly method
Appropriate modification and supplement are made, to be more suitable for applying needs.
Technical term explanation used herein：
LBA：Logical Block Address (logical block addresses), it is a kind of simple addressing mode, since 0
Numbering carrys out positioning logic block, and the LBA value of the first block is 0, and the LBA value of the second block is 1, by that analogy.
Cluster number：The numbering of cluster, is generally numbered from 1, and cluster is windows system minimum data MMU memory management units.
Fat tables：File allocation table (fat) is the table that file management system is used for distributing disk physical space to each file
Lattice, log file are stored in the position of disk.
Directory entry：Most important data structure, wherein depositing the filename about subdirectory or file, attribute, starting
The information such as cluster number, time value and content size.
BPB：It is the abbreviation of BIOS parameter blocks, it is located in the boot sector of storage device.
The content of the invention
, can be effective in view of the deficiencies of the prior art, the present invention provides a kind of method of rapid verification storage device
Solves the problems such as Large Volume Data carries out the too low efficiency that MD5 verifications are saved from damage, complex management.
To solve problem above, the technical solution adopted by the present invention is as follows：A kind of method of rapid verification storage device, bag
Include following steps：
S1. each parameter information of storage device, including specific data structure, described specific data structure bag are parsed
Include specific file system structure and specific monitor video structure；
Described specific file system structure has:fat12、fat16、fat32、ntfs、ext2、ext3、ext4、xfs、
Jfs, hfs and hfs+.
Described specific monitor video structure has:Haikang, big China, Chinese nation, sharp photopic vision news, Supreme Being regard treasured, wave-particle, WFS2/
3/4th, the monitor video data format that blueness is interspace, intelligence is led and dragon uses depending on peace manufacturer.
S2. judge whether the data structure of storage device is specific data structure according to the S1 parameter informations parsed, such as
Fruit is to skip to S3, otherwise skips to S5；
S3. the value of parameters in specific data structure is extracted, and records its deviation post；
S4. S6 is skipped to after being reconfigured to the specific data structure of extraction according to the order in storage device；
S5. without special construction then using totally it is byte-by-byte verified after skip to S6；
S6. the file after new file or S5 after being reconfigured to S4 are examined carries out MD5 verifications；
S7. MD5 values caused by verification are preserved, and preserve storage device position corresponding to each parameter simultaneously.
Preferably, S1 specific method is preceding 3 sectors in reading storage device, and parse the number stored in sector
According to.
Preferably, when described specific file system structure is fat32, then storage is extracted in fat32 structures
The MBR of equipment, partition boot record, fat tables 1, fat tables 2, root, the value and bits of offset of whole subdirectory items
Put.
Preferably, as the promising ntfs of described specific file system structure, then master is extracted in ntfs structures and drawn
Lead record, partition boot record, meta data file, the value and deviation post of all mtf list items.
Preferably, S3 is specifically further comprising the steps of：
S311. cluster information where reading current file clip directory from the root list item of file system；
S312. after jumping to the cluster number, directory entry information all under the cluster number is read one by one；
Whether the filename S313. contrasted in directory entry is consistent with the filename of the file to be opened, parses in directory entry
File attribute information, and matched with the file that current mouse is chosen, if mismatching, skip to S312 continue to read it is next
Directory entry information is matched, and otherwise skips to S314；
S314. after the match is successful, directory entry details are read, obtain file storage location and document size information；
S315. the usage record that corresponding this document storage location is recorded in fat tables is read, and obtains its LBA information；
S316. file access time or the modification time information in directory entry are updated, and is write back.
Preferably, S3 is specifically further comprising the steps of：
S321. when storage device writes file, cluster number where the root of storage write-in file or folder is first obtained
Information；
S322. the content of current directory item is read according to S321 cluster information, judges whether the directory entry is occupied, if
Do not have occupied, write new data；
S323. judge whether byte is normal labeled, only when the first byte of directory entry is 0xE5 or 0x00, represent the mesh
Record item is not used, and can write data；If so, then skip to S3212；If it is not, then skip to S324；
S324. next directory entry is skipped to；
S325. directory entry number in cluster is calculated, judges whether this directory entry exceeds the catalogue item number per cluster；If so, then jump
To S326；If it is not, then skip to S322；
S326. current cluster content is read, verifies the state record information on this cluster in fat tables；
S327. end mark, whether current directory item is judged in cluster tail, if so, then skipping to S329；If it is not, skip to
S328；
S328. the content of end mark is assigned to current cluster number, continues to read the content of the directory entry, skip to S321；
S329. verify and update the status information for recording the cluster in fat tables；
S3210. the position of next free cluster is read；
S3211. the content of next free cluster is read, skips to S323；
S3212. the directory entry information of file or folder is built, and is write；
S3213. the cluster state that this document or file use in fat tables is updated；
S3214. by file content write corresponding in cluster number；
S3215. judge whether file writes, if so, then skipping to S3219；If it is not, then skip to S3216；
S3216. current cluster number is obtained, by the lower cluster positional information of current cluster, preparation continues to write to data；
S3217. the positional information of next free cluster in fat tables is read；
S3218. the content information of free cluster in fat tables is read, and judges whether its preceding 4byte is all 0x00, if jumping
To S3213, S3217 is otherwise skipped to；
S3219. after completing write-in, fat tables and its backup information are updated；
S3220. it is successfully written file or folder.
The beneficial effects of the invention are as follows：The present invention is saving the magnetic that has specific data structure from damage using segmentation check algorithm
MBR, partition boot record, root, whole subdirectory items and the other all members of extraction storage device are only needed during disk
The value and deviation post in data file region, therefore largely save storage device data from damage, ensure electronics card
According to validity and reliability, and the purpose of rapid verification storage device can be reached.
Brief description of the drawings
Fig. 1 is the general flow chart of rapid verification storage device；
Fig. 2 is the detailed construction logic chart of fat32 subregions；
Fig. 3 is the flow chart for reading file or file；
Fig. 4 is the flow chart for writing file or file.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, develop simultaneously embodiment referring to the drawings, right
The present invention is described in further details.
A kind of method of rapid verification storage device, as shown in figure 1, comprising the following steps：
S1. each parameter information of storage device, including specific data structure, described specific data structure bag are parsed
Include specific file system structure and specific monitor video structure；
S2. judge whether the data structure of storage device is specific data structure according to the S1 parameter informations parsed, such as
Fruit is to skip to S3, otherwise skips to S5；
S3. the value of parameters in specific data structure is extracted, and records its deviation post；
S4. S6 is skipped to after being reconfigured to the specific data structure of extraction according to the order in storage device；
S5. without special construction then using totally it is byte-by-byte verified after skip to S6, this step is prior art；
S6. the file after new file or S5 after being reconfigured to S4 are examined carries out MD5 verifications, and this step is existing skill
Art；
S7. MD5 values caused by verification are preserved, and preserve storage device position corresponding to each parameter simultaneously, this value can be made
For the reference point verified next time, so that whether verification equipment information is by falsification.
The specific data structure that can be matched at present has:
File system structure:fat12、fat16、fat32、ntfs、ext2、ext3、ext4、xfs、jfs、hfs、hfs+；
Monitor video structure:Haikang, big China, Chinese nation, sharp photopic vision news, Supreme Being regard treasured, wave-particle, WFS2/3/4, blue interspace, intelligence
The monitor video data format that neck, dragon use depending on peace Deng50Yu Jia manufacturers；
Embodiment 1：
Here described in detail by taking fat32 as an example, be illustrated in figure 2 the detailed construction logic chart of fat32 subregions, pass through fat
Table and directory entry are managed to the All Files of storage, and to read or write file each time can all cause fat tables or mesh
The renewal of item information is recorded, so only needing to extract MBR, partition boot record, the fat of storage device in fat32 structures
Table 1, fat tables 2, root, the value and deviation post of whole subdirectory items, Fig. 3 and Fig. 4 illustrate in detail read file and
Write the process of file.
Embodiment 2：
Similarly, in ntfs structures, write-in file or reading file will also result in the multinomial mft list items in structure each time
Renewal, again may be by extract MBR, partition boot record, meta data file, all mft list items value with
Deviation post.
Read file and write the detailed process of file, as shown in Figure 3 and Figure 4：
1 reads file or folder
The reading of file or folder can change the attribute information of file or folder, so as to change the number of storage device
According to detailed in Example 3；
2 write-in file or folders
The write-in of file or folder can equally change the attribute information of file or folder, so as to change storage device
Data, detailed in Example 4.
Embodiment 3, as shown in Figure 3：
11 current directory clusters number
Cluster information where reading current file clip directory from the root list item of file system；
12 each directory entries
After jumping to the cluster number, directory entry information all under the cluster number is read one by one；
Whether the filename in 13 contrast directory entries is consistent with the filename of the file to be opened
The file attribute information in directory entry is parsed, and is matched with the file that current mouse is chosen, if mismatching,
Skip to 12 and continue to read next directory entry information and matched, until the match is successful, otherwise skip to 14；
14 read directory entry information
After the match is successful, directory entry details are read, obtain the information such as file storage location and file size；
15 obtain the cluster number and LBA value of the storage of fat list files
The usage record that corresponding this document storage location is recorded in fat tables is read, and obtains its LBA information；
16 renewal directory informations
The information such as file access time or the modification time in directory entry are updated, and are write back.
Embodiment 4, as shown in Figure 4：
21 read current root cluster number
When storage device writes file, the letter of cluster number where first obtaining the root of storage write-in file or folder
Breath；
22 read the content under current directory cluster
Judge whether the directory entry is occupied according to the information of cluster number, it is new in the write-in of this position to judge whether
Data；
23 judge whether byte is normal labeled
Only when the first byte of directory entry is 0xE5 (E5H) or 0x00 (00H), represents that the directory entry is not used, can write
Enter data；If so, then skip to 211；If it is not, then skip to 24；
24 skip to next directory entry；
25 calculate directory entry number in cluster
Judge whether this directory entry exceeds the catalogue item number per cluster；If so, then skip to 26；If it is not, then skip to 22；
26 read current cluster content
Verify the state record information in FAT table on this cluster；
27 end marks
Whether current directory item is judged in cluster tail, if so, then skipping to 29；If it is not, skip to 28；
The content of end mark is assigned to current cluster number by 28
Continue to read the content of the directory entry, skip to 21；
29 update the tufted state
Verify and update the status information for recording the cluster in FAT table；
210 read the position of next free cluster；
211 read the content of next free cluster, skip to 23；
The directory entry information of 212 structure file or folders, and write；
The cluster state that this document or file use in 213 renewal fat tables；
214 by file content write corresponding in cluster number；
215 judge whether file writes, if so, then skipping to 219；If it is not, then skip to 216；
216 obtain current cluster number, and by the lower cluster positional information of current cluster, preparation continues to write to data；
217 read the positional information of next free cluster in fat tables；
218 read the content information of free cluster in fat tables, and judge whether its preceding 4byte is all 0x00,
If skipping to 213,217 are otherwise skipped to；
After 219 complete write-in, fat tables and its backup information are updated；
220 are successfully written file or folder.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this hair
Bright implementation, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.Ability
The those of ordinary skill in domain can be made according to these technical inspirations disclosed by the invention it is various do not depart from essence of the invention its
Its various specific deformations and combination, these deformations and combination are still within the scope of the present invention.
Claims (6)
- A kind of 1. method of rapid verification storage device, it is characterised in that comprise the following steps：S1. each parameter information of storage device, including specific data structure are parsed；Specific data structure described in S1 includes specific file system structure and specific monitor video structure；Described Specific file system structure has:Fat12, fat16, fat32, ntfs, ext2, ext3, ext4, xfs, jfs, hfs and hfs+； Described specific monitor video structure has:Haikang, big China, Chinese nation, sharp photopic vision news, Supreme Being regard treasured, wave-particle, WFS2/3/4, blueness The monitor video data format that interspace, intelligence neck and dragon use depending on peace manufacturer；S2. judge whether the data structure of storage device is specific data structure according to the S1 parameter informations parsed, if S3 is then skipped to, otherwise skips to S5；S3. the value of parameters in specific data structure is extracted, and records its deviation post；S4. S6 is skipped to after being reconfigured to the specific data structure of extraction according to the order in storage device；S5. without special construction then using totally it is byte-by-byte verified after skip to S6；S6. the file after new file or S5 after being reconfigured to S4 are examined carries out MD5 verifications；S7. MD5 values caused by verification are preserved, and preserve storage device position corresponding to each parameter simultaneously.
- 2. according to the method for claim 1, it is characterised in that S1 specific method is preceding 3 fans in reading storage device Area, and parse the data stored in sector.
- 3. according to the method for claim 1, it is characterised in that when described specific file system structure is fat32, The MBR of storage device, partition boot record, fat tables 1, fat tables 2, root, complete is then extracted in fat32 structures The value and deviation post of portion's subdirectory item.
- 4. according to the method for claim 1, it is characterised in that as the described promising ntfs of specific file system structure When, then in ntfs structures extract MBR, partition boot record, meta data file, all MTF list items value and partially Pan position.
- 5. according to the method for claim 1, it is characterised in that S3 is specifically further comprising the steps of：S311. cluster information where reading current file clip directory from the root list item of file system；S312. after jumping to the cluster number, directory entry information all under the cluster number is read one by one；Whether the filename S313. contrasted in directory entry is consistent with the filename of the file to be opened, parses the text in directory entry Part attribute information, and matched with the file that current mouse is chosen, if mismatching, skip to S312 and continue to read next catalogue Item information is matched, and otherwise skips to S314；S314. after the match is successful, directory entry details are read, obtain file storage location and document size information；S315. the usage record that corresponding this document storage location is recorded in fat tables is read, and obtains its LBA information；S316. file access time or the modification time information in directory entry are updated, and is write back.
- 6. according to the method for claim 1, it is characterised in that S3 is specifically further comprising the steps of：S321. when storage device writes file, the letter of cluster number where first obtaining the root of storage write-in file or folder Breath；S322. according to S321 cluster information read current directory item content, judge whether the directory entry occupied, if not by Occupancy then writes new data；S323. judge whether byte is normal labeled, only when the first byte of directory entry is 0xE5 or 0x00, represent the directory entry It is not used, data can be write；If so, then skip to S3212；If it is not, then skip to S324；S324. next directory entry is skipped to；S325. directory entry number in cluster is calculated, judges whether this directory entry exceeds the catalogue item number per cluster；If so, then skip to S326；If it is not, then skip to S322；S326. current cluster content is read, verifies the state record information on this cluster in fat tables；S327. end mark, whether current directory item is judged in cluster tail, if so, then skipping to S329；If it is not, skip to S328；S328. the content of end mark is assigned to current cluster number, continues to read the content of the directory entry, skip to S321；S329. verify and update the status information for recording the cluster in fat tables；S3210. the position of next free cluster is read；S3211. the content of next free cluster is read, skips to S323；S3212. the directory entry information of file or folder is built, and is write；S3213. the cluster state that this document or file use in fat tables is updated；S3214. by file content write corresponding in cluster number；S3215. judge whether file writes, if so, then skipping to S3219；If it is not, then skip to S3216；S3216. current cluster number is obtained, by the lower cluster positional information of current cluster, preparation continues to write to data；S3217. the positional information of next free cluster in fat tables is read；S3218. the content information of free cluster in fat tables is read, and judges whether its preceding 4byte is all 0x00, if skipping to S3213, otherwise skip to S3217；S3219. after completing write-in, fat tables and its backup information are updated；S3220. it is successfully written file or folder.
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| CN105956172B (en) * | 2016-05-23 | 2019-08-13 | 深圳市硅格半导体有限公司 | The storage method and device of log information |
| CN106095619A (en) * | 2016-06-08 | 2016-11-09 | 杭州华三通信技术有限公司 | A kind of virtual machine backup method and device |
| CN107797881A (en) * | 2017-12-06 | 2018-03-13 | 郑州云海信息技术有限公司 | A kind of data coherence tester method, apparatus, equipment and storage medium |
| CN108763371B (en) * | 2018-05-17 | 2021-06-18 | 上海威固信息技术股份有限公司 | Exfat file system power-off protection and file detection recovery method |
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| CN103138871A (en) * | 2011-11-23 | 2013-06-05 | 毕书清 | Server data processing system and method of application program of mobile communication system |
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| US6779082B2 (en) * | 2001-02-05 | 2004-08-17 | Ulysses Esd, Inc. | Network-based disk redundancy storage system and method |
| KR101994811B1 (en) * | 2012-03-04 | 2019-07-01 | 삼성전자주식회사 | Electronic apparatus, method for restore of mbr and computer-readable recording medium |
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| US5696897A (en) * | 1994-01-31 | 1997-12-09 | Sun Microsystems, Inc. | Method and apparatus for a multi-layer system quiescent suspend and resume operation |
| CN1979436A (en) * | 2005-12-02 | 2007-06-13 | 联想(北京)有限公司 | Data back-up system and method and system load-bearing apparatus |
| CN103138871A (en) * | 2011-11-23 | 2013-06-05 | 毕书清 | Server data processing system and method of application program of mobile communication system |
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