CN110110540A - A kind of information steganography method and device based on excel file - Google Patents
A kind of information steganography method and device based on excel file Download PDFInfo
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- CN110110540A CN110110540A CN201910396588.XA CN201910396588A CN110110540A CN 110110540 A CN110110540 A CN 110110540A CN 201910396588 A CN201910396588 A CN 201910396588A CN 110110540 A CN110110540 A CN 110110540A
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- 239000000284 extract Substances 0.000 claims description 6
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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
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
- G06F21/16—Program or content traceability, e.g. by watermarking
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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
- G06F21/602—Providing cryptographic facilities or services
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F40/00—Handling natural language data
- G06F40/10—Text processing
- G06F40/103—Formatting, i.e. changing of presentation of documents
- G06F40/109—Font handling; Temporal or kinetic typography
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F40/00—Handling natural language data
- G06F40/10—Text processing
- G06F40/12—Use of codes for handling textual entities
- G06F40/126—Character encoding
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Abstract
The present invention discloses a kind of information steganography method and device based on excel file, comprising: encodes the information to steganography, obtains encoded information；The encoded information is segmented according to predetermined segment rule, obtains at least one segment information；Each corresponding segment number of the segment information；The segment information and its corresponding segment number are written according to the first pre-defined rule in the cell background color of excel file, and after write-in, under resolution of eye, the cell background color is constant.Technical solution provided by the invention, can be by information steganography into excel file, while not influencing use of the user to file.
Description
Technical field
The present invention relates to information steganography technical field more particularly to a kind of information steganography method based on excel file and
Device.
Background technique
During being transmitted to excel file, some information are not intended to user and know, for example, can be right
Information that excel file was managed trace to the source.And these trace to the source information and contents of file itself and uncorrelated, if directly by it
It is stored in file content, the reading experience of user certainly will be will affect.And if the information that will trace to the source individually stores, and it is unfavorable for pair
The management of excel file, and be easily lost.
Summary of the invention
The present invention is intended to provide a kind of information steganography method and device based on excel file, it can be by information steganography extremely
In excel file, while use of the user to file is not influenced.
In order to achieve the above objectives, The technical solution adopted by the invention is as follows:
A kind of information steganography method based on excel file, comprising: the information to steganography is encoded, coding is obtained
Information；The encoded information is segmented according to predetermined segment rule, obtains at least one segment information；Each segment information
A corresponding segment number；The segment information and its corresponding segment number are written to the list of excel file according to the first pre-defined rule
In first lattice background color, and after write-in, under resolution of eye, the cell background color is constant.
Further, further includes: excel is written into according to the second pre-defined rule in the segment information and its corresponding segment number
In the character font color of file, and after write-in, under resolution of eye, the font color is constant.
Further, further includes: extract the segment information according to first pre-defined rule from the cell background color
And its corresponding segment number, form the encoded information；And/or it is predetermined according to described second from the character font color
Segment information described in Rule Extraction and its corresponding segment number, form the encoded information；Steganography is obtained according to the encoded information
Information.
Further, described from the cell background color according to first pre-defined rule extract the segment information and
Before its corresponding segment number, and/or, institute is extracted according to second pre-defined rule from the character font color described
Before stating segment information and its corresponding segment number, further includes: verify whether the segment information is edited；Verify the segment information with
Whether the segment number corresponds；Whether complete verify the segment information.
Preferably, it is encoded using the information that ASCll coding techniques treats steganography；Each segment information has 3；Institute
Stating segment number is binary number.
Preferably, described that excel file is written into according to the first pre-defined rule in the segment information and its corresponding segment number
Cell background color in include: last 3 of channel B that the segment information is written to the cell background color；Described section is believed
Cease corresponding segment number be written the same cell cell background color the channel R and/or last 3 of the channel G.
Preferably, described that excel file is written into according to the second pre-defined rule in the segment information and its corresponding segment number
Character font color in include: last 3 of channel B that the segment information is written to the font color；Described section is believed
Cease corresponding segment number be written the same character font color the channel R and/or last 3 of the channel G.
A kind of information steganography device based on excel file, comprising: coding unit, for the information to steganography to be carried out
Coding obtains encoded information；Segmenting unit obtains extremely for the encoded information to be segmented according to predetermined segment rule
A few segment information；Each corresponding segment number of the segment information；First steganography unit, for by the segment information and its right
In cell background color of the segment number answered according to the first pre-defined rule write-in excel file, and after write-in, in resolution of eye
Under, the cell background color is constant.
Further, further includes: the second steganography unit is used for the segment information and its corresponding segment number according to second
Pre-defined rule is written in the character font color of excel file, and after write-in, under resolution of eye, the font color is not
Become.
Further, further includes: extraction unit, for being mentioned from the cell background color according to first pre-defined rule
The segment information and its corresponding segment number are taken, the encoded information is formed；And/or from the character font color according to
Second pre-defined rule extracts the segment information and its corresponding segment number, forms the encoded information；Steganography acquisition of information
Unit, for obtaining steganography information according to the encoded information.
Information steganography method and device provided in an embodiment of the present invention based on excel file, will need the information of steganography
After encoding and being segmented, segment information and its corresponding segment number are written in the cell background color of excel file, meanwhile, it can also incite somebody to action
Segment information and its corresponding segment number write-in excel file character font color in, and information write-in after, cell background color and
Character font color does not change under resolution of eye.So that user is when reading excel file content, in this case it is not apparent that steganography
The presence of information will not influence use of the user to file.It, can be according to letter of tracing to the source when steganography information traces to the source information for file
Breath effectively manages file, improves the management quality of file.
Detailed description of the invention
Fig. 1 is the method flow diagram of the embodiment of the present invention one；
Fig. 2 is the method flow diagram of the embodiment of the present invention two；
Fig. 3 is the method flow diagram of the embodiment of the present invention three；
Fig. 4 is the structure drawing of device of the embodiment of the present invention one；
Fig. 5 is the structure drawing of device of the embodiment of the present invention two；
Fig. 6 is the structure drawing of device of the embodiment of the present invention three；
Fig. 7 is character information to be changed into encoded information in the embodiment of the present invention, and split into the schematic diagram of segment information；
Fig. 8 is in the embodiment of the present invention by the schematic diagram in segment information and its corresponding segment number writing unit lattice background color；
Fig. 9 is signal segment information and its corresponding segment number being written in the embodiment of the present invention in character font color
Figure；
Figure 10 is the schematic diagram verified in the embodiment of the present invention to the segment information in cell background color；
Figure 11 is the schematic diagram verified in the embodiment of the present invention to the segment information in character font color.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing, to the present invention into
Row is further described.
Fig. 1 is the method flow diagram of the embodiment of the present invention one, comprising:
Step 101, the information to steganography is encoded, obtains encoded information；
In this step, using ASCll (American Standard Code for lnformation
Interchange, ASCII) coding techniques treats the information of steganography and encoded.Specifically, first will
Information (information for example, file is traced to the source) to steganography is changed into 24 character informations, for example, by a file trace to the source information transformation
For character information " 9be866a580c447d7b21c94aa ".It then will be in 24 character informations using ASCll coding techniques
Each character is changed into 8 ASCll codes, i.e., can finally obtain 192 encoded informations being made of 0 and 1.
Step 102, the encoded information is segmented according to predetermined segment rule, obtains at least one segment information；Often
A corresponding segment number of the segment information；
In this step, specifically, to 192 acquired bit-encoded informations according to sequence from left to right, every 3 are one
Section, is split as 64 sections for encoded information.Each segment information has unique corresponding segment number.It certainly, can also be according to from right to left
Sequence encoded information is split, can also split, be not specifically limited herein in other sequences according to actual needs.It tears open
The digit of timesharing, each segment information can also carry out adjustment appropriate according to actual needs, also be not specifically limited herein.Fig. 7 is
24 character informations are changed into 192 bit-encoded informations using ASCll coding techniques in the present embodiment, and 192 codings are believed
Breath splits into the schematic diagram of 64 segment informations.
Step 103, the segment information and its corresponding segment number are written to the list of excel file according to the first pre-defined rule
In first lattice background color, and after write-in, under resolution of eye, the cell background color is constant.
Due to various colors be by red (R), green (G), blue (B) three Color Channels variation and they between each other
Superposition obtain, and when minor change occurs for certain numerical value in tri- channels R, G, B, human eye be it is imperceptible,
That is the color integrally shown is constant although the numerical value in three channels is changed.According to this principle,
We above-mentioned segment information can be written in tri- channels R, G, B, and user can't discover the presence of the information.
In the present embodiment, the cell background color of all cells is white in excel file, i.e. tri- channels R, G, B
Value be 11111111.Segment information and its corresponding segment number are written to the unit of excel file according to the first pre-defined rule
Method in lattice background color is as follows: the cell set that information is written selected first, method for selecting is, when in excel file
The occupied cell quantity of character be less than segment information quantity, i.e., less than 64 when, using the A1 cell of excel file as starting point,
Automatically choosing preceding 64 cells closed on is writing position, and a unit is written in a segment information and its corresponding segment number
Lattice.At this point, the number of copies for the encoded information (information of tracing to the source) that can be written is 1.When the character in excel file is occupied
Cell quantity is greater than the integral multiple of segment information quantity, that is, when being greater than (1≤n≤5) 64n, randomly selecting 64n cell is to write
Enter position, a cell is written in a segment information and its corresponding segment number.At this point, the encoded information that can be written (is traced back
Source information) number of copies be n.
After selected cell set, most by the channel B of the cell background color of the selected cell of segment information write-in
3 afterwards；Meanwhile the corresponding segment number of the segment information being written to the channel R and/or the G of the cell background color of the same cell
Last 3 of channel, as shown in Figure 8.Segment number in the present embodiment uses binary number, and has 6, just replaces the channel R
With last 3 of the channel G.Certainly, segment number can also be less than 6, only replace the channel R or only replace the several last of the channel G,
As long as the cell background color finally presented is constant.
Fig. 2 is the method flow diagram of the embodiment of the present invention two, further, on the basis of example 1, further includes:
Step 104, the segment information and its corresponding segment number are written to the word of excel file according to the second pre-defined rule
It accords in font color, and after write-in, under resolution of eye, the font color is constant.
In the present embodiment, the font color of all characters is black in excel file, i.e. the value in tri- channels R, G, B
It is 00000000.Segment information and its corresponding segment number are written to the font color of excel file according to the second pre-defined rule
In method it is as follows: the character set that information is written selected first, method for selecting is the character quantity in excel file
Less than segment information quantity, i.e., less than 64 when, since a segment information and its corresponding segment number need to be written in a character, and
Number of characters at this time can not accommodate complete 64 segment informations, therefore, not make segment information sucking operation.When in excel file
Character quantity is greater than the integral multiple of segment information quantity, that is, when being greater than (1≤n≤10) 64n, randomly selects 64n character as write-in
A character is written in position, a segment information and its corresponding segment number.At this point, encoded information (the letter of tracing to the source that can be written
Breath) number of copies be n.
After selected character set, the segment information is written last 3 of the channel B of the font color；Meanwhile by institute
State the corresponding segment number of segment information be written the same character font color the channel R and/or last 3 of the channel G, such as Fig. 9
It is shown.Segment number in the present embodiment uses binary number, and has 6, last 3 for just replacing the channel R and the channel G.When
So, segment number can also be less than 6, only replace the channel R or only replace the several last of the channel G, as long as the character finally presented
Font color it is constant.
It in actual operation, can be according to the above method respectively in the font face of the cell background color of excel file and character
Segment information is written in color, multiple copies of information of tracing to the source can be obtained.And these copies are segmented in write-in excel file, it can
The safety and anti-interference of the information of tracing to the source of steganography is effectively ensured.
Fig. 3 is the method flow diagram of the embodiment of the present invention three, further, on the basis of example 2, further includes:
Step 105, the segment information is verified；
In this step, verification is carried out to segment information and includes: whether the verification segment information is edited, that is, verifies segment information
Availability.Specifically, for the segment information in cell background color, whether first 5 for verifying tri- channels R, G, B are 11111,
If it is not, then verifying failure, i.e., segment information is unavailable, as shown in Figure 10；For the segment information in the font color of character, verification
R, whether first 5 of tri- channels G, B are 00000, if it is not, then verifying failure, i.e., segment information is unavailable, such as Figure 11 institute
Show.
Segment information is verified further include: verify whether the segment information corresponds with the segment number, that is, verify
The consistency of segment information.If different segment informations occurs in the same segment number, then failure is verified, i.e. segment information is inconsistent.
Segment information is verified further include: verify whether the segment information is complete, that is, verify the integrality of segment information.It wants
Failure must be verified if there is missing comprising complete 64 segment information by asking in excel file, i.e. segment information is imperfect.
Step 106, the segment information and its correspondence are extracted according to first pre-defined rule from the cell background color
Segment number, form the encoded information；And/or it is extracted from the character font color according to second pre-defined rule
The segment information and its corresponding segment number, form the encoded information；
Segment information extraction process in this step is write to carry out segment information according to the first pre-defined rule or the second pre-defined rule
The inverse process entered.First pre-defined rule is specific wiring method described in step 103, and the second pre-defined rule is step
Specific wiring method described in 104.This rule can carry out appropriate adjustment according to the actual situation, for example, being written in segment information
In the process, the channel R or the channel G can also be written into segment information, and channel B is written into segment number, as long as when segment information extracts,
Inverse operation is carried out according to same rule.
Step 107, steganography information is obtained according to the encoded information.
Steganography information in the present embodiment is that file is traced to the source information.Acquisition is traced to the source after information, and can trace to the source letter according to this
Breath traces to the source to excel file, so as to effectively be managed excel file.Especially go out in excel file content
When now leaking, leakage source can be traced, the deterioration of incident of leakage can be controlled to a certain extent according to information of tracing to the source.
Also a kind of information steganography device based on excel file of the present invention, as shown in Figure 4, comprising: coding unit is used for
Information to steganography is encoded, encoded information is obtained；Segmenting unit, for advising the encoded information according to predetermined segment
It is then segmented, obtains at least one segment information；Each corresponding segment number of the segment information；First steganography unit, is used for
The segment information and its corresponding segment number are written in the cell background color of excel file according to the first pre-defined rule, and write
After entering, under resolution of eye, the cell background color is constant.
Further, as shown in Figure 5, further includes: the second steganography unit, for the segment information and its corresponding section to be compiled
Number according to the second pre-defined rule write-in excel file character font color in, and be written after, it is described under resolution of eye
Character font color is constant.
Further, as shown in Figure 6, further includes: extraction unit is used for from the cell background color according to described first
Pre-defined rule extracts the segment information and its corresponding segment number, forms the encoded information；And/or from the character font
The segment information and its corresponding segment number are extracted according to second pre-defined rule in color, forms the encoded information；It is hidden
Write information acquiring unit, for obtaining steganography information according to the encoded information.
Information steganography device based on excel file provided by the embodiment of the present invention, working principle and specific work
Make process to be elaborated in the information steganography method provided by the present invention based on excel file, herein not
It repeats again.
Information steganography method and device provided in an embodiment of the present invention based on excel file, will need the information of steganography
After encoding and being segmented, segment information and its corresponding segment number are written in the cell background color of excel file, meanwhile, it can also incite somebody to action
In the font color of segment information and its corresponding segment number write-in excel file, and after information write-in, cell background color and font
Color does not change under resolution of eye.So that user is when reading excel file content, in this case it is not apparent that steganography information is deposited
It will not influence use of the user to file.It, can be according to information of tracing to the source to file when steganography information traces to the source information for file
It is effectively managed, improves the management quality of file.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.
Claims (10)
1. a kind of information steganography method based on excel file characterized by comprising
Information to steganography is encoded, encoded information is obtained；
The encoded information is segmented according to predetermined segment rule, obtains at least one segment information；Each segment information
A corresponding segment number；
The segment information and its corresponding segment number are written according to the first pre-defined rule in the cell background color of excel file,
And after being written, under resolution of eye, the cell background color is constant.
2. the information steganography method according to claim 1 based on excel file, which is characterized in that further include:
The segment information and its corresponding segment number are written to the character font color of excel file according to the second pre-defined rule
In, and after write-in, under resolution of eye, the character font color is constant.
3. the information steganography method according to claim 2 based on excel file, which is characterized in that further include:
The segment information and its corresponding segment number are extracted according to first pre-defined rule from the cell background color, is formed
The encoded information；And/or from the character font color according to second pre-defined rule extract the segment information and its
Corresponding segment number forms the encoded information；
Steganography information is obtained according to the encoded information.
4. the information steganography method according to claim 3 based on excel file, which is characterized in that described from described
Before extracting the segment information and its corresponding segment number according to first pre-defined rule in cell background color, and/or, in institute
It states before extracting the segment information and its corresponding segment number according to second pre-defined rule in the character font color,
Further include:
Verify whether the segment information is edited；
Verify whether the segment information corresponds with the segment number；
Whether complete verify the segment information.
5. the information steganography method according to claim 2 based on excel file, which is characterized in that encoded using ASCII
The information that technology treats steganography is encoded；Each segment information has 3；The segment number is binary number.
6. the information steganography method according to claim 5 based on excel file, which is characterized in that described by described section
Information and its corresponding segment number include: in the cell background color according to the first pre-defined rule write-in excel file
The segment information is written last 3 of the channel B of the cell background color；
The channel R and/or the channel G that the cell background color of the same cell is written in the corresponding segment number of the segment information are most
3 afterwards.
7. the information steganography method according to claim 5 based on excel file, which is characterized in that described by described section
Information and its corresponding segment number include: in the character font color according to the second pre-defined rule write-in excel file
The segment information is written last 3 of the channel B of the character font color；
By the corresponding segment number of the segment information be written the font color of the same character the channel R and/or the channel G last 3
Position.
8. a kind of information steganography device based on excel file characterized by comprising
Coding unit obtains encoded information for encoding the information to steganography；
Segmenting unit obtains at least one segment information for the encoded information to be segmented according to predetermined segment rule；Often
A corresponding segment number of the segment information；
First steganography unit, for the segment information and its corresponding segment number is literary according to the first pre-defined rule write-in excel
In the cell background color of part, and after write-in, under resolution of eye, the cell background color is constant.
9. the information steganography device according to claim 8 based on excel file, which is characterized in that further include:
Second steganography unit, for the segment information and its corresponding segment number is literary according to the second pre-defined rule write-in excel
In the character font color of part, and after write-in, under resolution of eye, the character font color is constant.
10. the information steganography device according to claim 9 based on excel file, which is characterized in that further include:
Extraction unit, for extracting the segment information and its correspondence according to first pre-defined rule from the cell background color
Segment number, form the encoded information；And/or it is extracted from the character font color according to second pre-defined rule
The segment information and its corresponding segment number, form the encoded information；
Steganography information acquisition unit, for obtaining steganography information according to the encoded information.
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Cited By (1)
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| WO2022056989A1 (en) * | 2020-09-18 | 2022-03-24 | Huawei Cloud Computing Technologies Co., Ltd. | Digital watermarking for textual data |
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