CN103902925B - The method and apparatus signed for digital document - Google Patents
The method and apparatus signed for digital document Download PDFInfo
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- CN103902925B CN103902925B CN201210588467.3A CN201210588467A CN103902925B CN 103902925 B CN103902925 B CN 103902925B CN 201210588467 A CN201210588467 A CN 201210588467A CN 103902925 B CN103902925 B CN 103902925B
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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
- G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
Abstract
The present invention proposes the method and apparatus signed for digital document.Wherein, methods described includes：Signing messages generating means obtain the original digital file of electronic pictures form from applications, and generate signed data sequence according to md5 encryption algorithm, and the signed data sequence is embedded into the original digital file of the electronic pictures form；Signing messages extracts checking device and the original digital file for the electronic pictures form for having been inserted into signed data sequence is obtained from applications, and is extracted according to sigverif allocation list and verify the signed data sequence.The method and apparatus disclosed in this invention signed for digital document can realize offline authentication and can prevent that digital document and signing messages associated there from illegally being distorted.
Description
Technical field
The present invention relates to file signature method and apparatus, more particularly, to the method signed for digital document and set
It is standby.
Background technology
At present, increasingly extensive and different field the class of business applied with cyber-net becomes increasingly abundant,
For to digital document（Such as electronic bill in financial field）Signed（Such as electronic endorsement in financial field）'s
Method and apparatus becomes more and more important.
The basic functional principle of the existing method and apparatus signed for digital document is as follows（With the electricity in financial field
Exemplified by son endorsement）：With the private key encryption signing messages of endorsement person to obtain the first operation result, with by the public key encryption of endorsement person
First operation result is to obtain ciphertext data；The ciphertext data are converted to for the electronic graphical of Electronic Paper
Signed data, and the ciphertext data are converted into printed signature information；By the graphical signed data electronically
It is presented in Electronic Paper and/or the printed signature information is printed upon on information medium.
However, there are the following problems for the existing method and apparatus for digital document signature（To be directed in financial field
Exemplified by the electronic endorsement of electronic bill）：（1）Due to the asymmetric encryption during signing messages is generated using two pairs of keys
Algorithm, therefore cause that online validation can only be carried out with signer during signing messages is verified, and multiple label can not be realized
Famous person is continuously signed to single digital document；（2）The signing messages of signer is associated not with the content of digital document, therefore
Distorting to the digital document of graphic form can not effectively be prevented.
Accordingly, there exist following demand：Offer can realize offline authentication and can prevent digital document and with its phase
What the signing messages of association was illegally distorted is used for the method and apparatus that digital document is signed.
The content of the invention
In order to solve the problems of above-mentioned prior art, the present invention propose can realize offline authentication and
Method that being used for of can preventing that digital document and signing messages associated there from illegally being distorted, digital document signed and
Equipment.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method signed for digital document, the method signed for digital document comprises the following steps：
（A1）Signing messages generating means from applications obtain electronic pictures form original digital file, and according to
Md5 encryption algorithm generates signed data sequence, and the signed data sequence is embedded into the original of the electronic pictures form
In beginning digital document；
（A2）Signing messages extraction element has been inserted into the electronic pictures form of signed data sequence from applications acquisition
Original digital file, and extracted according to sigverif allocation list and verify the signed data sequence, wherein, the file
Signature verification allocation list includes the identifier and its corresponding signer public key of each signer.
In scheme disclosed above, it is preferable that the step（A1）Further comprise：（1）Obtained from applications
The original digital file of electronic pictures form and as original document image data；（2）Judge signer list whether be
Sky, if signer list for sky, using in the signer list the first signer is as current signature person and enters
Step（3）If signer list is sky, terminate the generation of signed data sequence and telescopiny；（3）If first is secondary
Into with embedded signed data, then by the original document image data composing document data message, if non-first time is generated
With embedded signed data, then the destination file obtained by last generation and the operation of embedded signed data is separated into previous label
Name data and original document image data, and the original document image data and previous signatures data are combined written in order
Part data message；（4）Calculate the MD5 digest of the file data message；（5）With MD5 described in the private key encryption of current signature person
Summary, with the person's signed data that generates current signature；（6）If generating for the first time and embedded signed data, then by current signature
The identifier and current signature person's signed data of person is combined into signed data sequence, if non-first time generation and embedded signature
Data, then be combined into signed data sequence by previous signatures data, the identifier of current signature person and current signature person's signed data
Row；（7）The signed data sequence is embedded into the original document image data using blind watermatking embedded mobile GIS and from institute
State and the current signature person is deleted in signer list, be then returned to step（2）.
In scheme disclosed above, it is preferable that the step（A2）Further comprise：（1）Obtained from applications
Have been inserted into the original digital file of the electronic pictures form of signed data sequence；（2）By the signed data sequence of having been inserted into
The original digital file of electronic pictures form is separated into signed data sequence and original document image data；（3）According to the text
Part signature verification allocation list builds signer information list to be verified, wherein, the signer information list to be verified includes treating
Verify the identifier nucleotide sequence and corresponding signer public key sequence of signer；（4）Judge the signer information list to be verified
Whether it is empty, if the signer information list to be verified is sky, terminates whole verification process and the result is " to test
Demonstrate,prove successfully ", if the signer information list to be verified is not sky, obtain in the signer information list to be verified the
The identifier of one invalidated signer searches institute as current signature party identifier, and in the signed data sequence
Current signature party identifier position is stated, then by the original document image data and in the current signature party identifier
Signed data before is combined into file data message in order, and calculates the MD5 digest of the file data message；（5）With
Marked in signed data sequence described in the corresponding signer public key decryptions of the current signature party identifier with the current signature side
Know the corresponding signed data of symbol, and decrypted result is compared with the MD5 digest of the file data message calculated, such as
Both are identical for fruit, then the signed data of current signature side is proved to be successful, and is then deleted from the signer information list to be verified
Except the information of current signature side, and return to step（4）If both are different, terminate whole verification process and the result
For " authentication failed ".
The purpose of the present invention can also be achieved through the following technical solutions：
A kind of signing messages generating means, the signing messages generating means obtain electronic pictures form from applications
Original digital file, and signed data sequence is generated according to md5 encryption algorithm, and the signed data sequence is embedded into institute
In the original digital file for stating electronic pictures form.
The purpose of the present invention can also be achieved through the following technical solutions：
A kind of signing messages extracts checking device.The signing messages extracts checking device and had been inserted into from applications acquisition
The original digital file of the electronic pictures form of signed data sequence, and extracted according to sigverif allocation list and verify institute
Signed data sequence is stated, wherein, the identifier of the sigverif allocation list including each signer and its is corresponding
Signer public key.
The method and apparatus disclosed in this invention signed for digital document has advantages below：（1）Due to using non-
Symmetric encipherment algorithm, therefore using only the corresponding signed data of public key decryptions of signer, therefore can realize that signed data is recognized offline
Card；（2）It can realize that multiple signers are continuously signed to single digital document；（3）Due to signer signing messages with
The content of digital document is associated, therefore can effectively prevent from distorting the illegal of digital document.
Brief description of the drawings
With reference to accompanying drawing, technical characteristic of the invention and advantage will be more fully understood by those skilled in the art, wherein：
Fig. 1 is to be used for the flow chart for the method that digital document is signed according to an embodiment of the invention.
Embodiment
The invention discloses a kind of signing messages generating means.The signing messages generating means obtain electricity from applications
The original digital file of subgraph sheet form（Such as original document pictorial information in financial field）, and according to md5 encryption algorithm
Generate signed data sequence（For example, in financial field, by multiple sequences endorsed and constituted, wherein, " endorsement " refers to bill
On signature）, and the signed data sequence is embedded into the original digital file of the electronic pictures form.
Preferably, signing messages generating means disclosed in this invention generate the signed data sequence simultaneously as follows
In the original digital file that the signed data sequence is embedded into the electronic pictures form：（1）Electricity is obtained from applications
The original digital file of subgraph sheet form and as original document image data（Such as original document image data）；（2）
Judge signer list（The signer sequence is determined previously according to demand, for example, being signed jointly if necessary to three related sides
Name the electronic pictures form original digital file, then the signer sequence by three related sides group identifier into）
Whether it is empty, if signer list is not sky, regard the first signer in the signer list as current signature person
And enter step（3）If signer list is sky, terminate the generation of signed data sequence and telescopiny；（3）If the
Once generate and embedded signed data, then by the original document image data composing document data message（Such as bill data
Message）, if non-first time generation and embedded signed data, then by obtained by last generation and the operation of embedded signed data
To destination file be separated into previous signatures data（It in the form of watermark to be embedded in original document image data）And original
Beginning file, picture data, and the original document image data and previous signatures data are combined into file data report in order
Text；（4）Calculate the MD5 digest of the file data message；（5）With MD5 digest described in the private key encryption of current signature person, with life
Into current signature person's signed data；（6）If generating for the first time and embedded signed data, then by the identifier of current signature person
Signed data sequence is combined into current signature person's signed data, if non-first time generation and embedded signed data, then will
Previous signatures data, the identifier of current signature person and current signature person's signed data are combined into signed data sequence；（7）Using
The signed data sequence is embedded into the original document image data and arranged from the signer by blind watermatking embedded mobile GIS
The current signature person is deleted in table, step is then returned to（2）.
Checking device is extracted the invention discloses a kind of signing messages.The signing messages extracts checking device should from outside
The original digital file for the electronic pictures form for having been inserted into signed data sequence with obtaining, and according to sigverif allocation list
Extract and verify the signed data sequence, wherein, the sigverif allocation list includes the identifier of each signer
And its corresponding signer public key.
Preferably, signing messages disclosed in this invention extracts checking device and extracts as follows and verify the signature
Data sequence：（1）The original digital file for the electronic pictures form for having been inserted into signed data sequence is obtained from applications；（2）
The original digital file of the electronic pictures form for having been inserted into signed data sequence is separated into signed data sequence and original
File, picture data（Such as original document image data）；（3）Signed certificate to be tested is built according to the sigverif allocation list
Recipe information list（Exemplarily, the signer to be verified can be determined by way of configuring）, wherein, it is described to treat
Verify that signer information list includes the identifier nucleotide sequence and corresponding signer public key sequence of signer to be verified；（4）Judge
Whether the signer information list to be verified is empty, if the signer information list to be verified is sky, terminates whole
Verification process and the result are " being proved to be successful ", if the signer information list to be verified is not sky, obtain institute
The identifier of first invalidated signer in signer information list to be verified is stated as current signature party identifier, and
The current signature party identifier position is searched in the signed data sequence, then by the original document picture number
File data message is combined into order according to the signed data before the current signature party identifier, and calculates the text
The MD5 digest of part data message；（5）With signed data described in the corresponding signer public key decryptions of the current signature party identifier
The signed data corresponding with the current signature party identifier in sequence（In the signed data sequence, it works as described
After preceding signature party identifier）, and decrypted result is compared with the MD5 digest of the file data message calculated, such as
Both are identical for fruit, then the signed data of current signature side is proved to be successful, and is then deleted from the signer information list to be verified
Except the information of current signature side, and return to step（4）If both are different, terminate whole verification process and the result
For " authentication failed ".
Fig. 1 is to be used for the flow chart for the method that digital document is signed according to an embodiment of the invention.As shown in figure 1, this
The disclosed method for being used for digital document signature of invention comprises the following steps：（A1）Signing messages generating means are from applications
Obtain the original digital file of electronic pictures form（Such as original document pictorial information in financial field）, and added according to MD5
Close algorithm generates signed data sequence（For example, in financial field, by multiple sequences endorsed and constituted, wherein, " endorsement " refers to
It is the signature on bill）, and the signed data sequence is embedded into the original digital file of the electronic pictures form；
（A2）Signing messages, which is extracted, verifies the original of the electronic pictures form that device has been inserted into signed data sequence from applications acquisition
Digital document, and extracted according to sigverif allocation list and verify the signed data sequence, wherein, the file signature
Checking allocation list includes the identifier and its corresponding signer public key of each signer.
Preferably, in the method disclosed in this invention signed for digital document, the step（A1）Further wrap
Include：（1）The original digital file of electronic pictures form is obtained from applications and as original document image data（For example
Original document image data）；（2）Judge signer list（The signer sequence is determined previously according to demand, for example, such as
Fruit needs three related sides to sign jointly the original digital file of the electronic pictures form, then the signer sequence is by described three
The group identifier of individual related side into）Whether it is empty, if signer list is not sky, by first in the signer list
Signer is as current signature person and enters step（3）If, signer list for sky, terminate signed data sequence generation and
Telescopiny；（3）If generating for the first time and embedded signed data, then by the original document image data composing document number
According to message（Such as bill data message）, if non-first time generation and embedded signed data, then generate the last time and embedding
Enter the destination file obtained by the operation of signed data and be separated into previous signatures data（It is embedded in original in the form of watermark
In file, picture data）With original document image data, and by the original document image data and previous signatures data by suitable
Sequence is combined into file data message；（4）Calculate the MD5 digest of the file data message；（5）Added with the private key of current signature person
The close MD5 digest, with the person's signed data that generates current signature；（6）If generating for the first time and embedded signed data, then will
The identifier and current signature person's signed data of current signature person is combined into signed data sequence, if non-first time generation and
Embedded signed data, then be combined into label by previous signatures data, the identifier of current signature person and current signature person's signed data
Name data sequence；（7）The signed data sequence is embedded into by the original document image data using blind watermatking embedded mobile GIS
In and delete the current signature person from the signer list, be then returned to step（2）.
Preferably, in the method disclosed in this invention signed for digital document, the step（A2）Further wrap
Include：（1）The original digital file for the electronic pictures form for having been inserted into signed data sequence is obtained from applications；（2）Will be described
The original digital file for having been inserted into the electronic pictures form of signed data sequence is separated into signed data sequence and original document figure
Sheet data（Such as original document image data）；（3）Signer letter to be verified is built according to the sigverif allocation list
Cease list（Exemplarily, the signer to be verified can be determined by way of configuring）, wherein, the signed certificate to be tested
Recipe information list includes the identifier nucleotide sequence and corresponding signer public key sequence of signer to be verified；（4）Treated described in judging
Whether checking signer information list is empty, if the signer information list to be verified is sky, terminates whole authenticated
Journey and the result are " being proved to be successful ", if the signer information list to be verified is not sky, obtain described to be tested
The identifier of first invalidated signer is as current signature party identifier in signed certificate recipe information list, and described
The current signature party identifier position is searched in signed data sequence, then by the original document image data and
Signed data before the current signature party identifier is combined into file data message in order, and calculates the file data
The MD5 digest of message；（5）With in signed data sequence described in the corresponding signer public key decryptions of the current signature party identifier
The signed data corresponding with the current signature party identifier（In the signed data sequence, it is in the current signature
After party identifier）, and decrypted result is compared with the MD5 digest of the file data message calculated, if both
Identical, then the signed data of current signature side is proved to be successful, and then deletes current from the signer information list to be verified
The information of signer, and return to step（4）If both are different, terminate whole verification process and the result is " checking
Failure ".
Therefore, the method disclosed in this invention signed for digital document has following advantages：（1）Due to using
Rivest, shamir, adelman, therefore using only the corresponding signed data of public key decryptions of signer, therefore can realize that signed data is offline
Certification；（2）It can realize that multiple signers are continuously signed to single digital document；（3）Due to the signing messages of signer
It is associated with the content of digital document, therefore can effectively prevent from distorting the illegal of digital document.
Although the present invention is described by above-mentioned preferred embodiment, its way of realization is not limited to
Above-mentioned embodiment.It should be realized that：In the case where not departing from spirit and scope of the present invention, those skilled in the art can be with
Different change and modifications is made to the present invention.
Claims (4)
1. a kind of method signed for digital document, the method signed for digital document comprises the following steps：
(A1) signing messages generating means obtain the original digital file of electronic pictures form from applications, and are added according to MD5
Close algorithm generates signed data sequence, and the signed data sequence is embedded into the original figure of the electronic pictures form
In file；
(A2) signing messages, which is extracted, verifies the electronic pictures form that device has been inserted into signed data sequence from applications acquisition
Original digital file, and extracted according to sigverif allocation list and verify the signed data sequence, wherein, the file
Signature verification allocation list includes the identifier and its corresponding signer public key of each signer；
Wherein, the step (A1) further comprises：(1) original digital file of electronic pictures form is obtained simultaneously from applications
As original document image data；(2) whether be empty, will if signer list is not sky if judging signer list
The first signer in the signer list is as current signature person and into step (3), if signer list is sky,
Terminate the generation of signed data sequence and telescopiny；(3) if generating for the first time and embedded signed data, then by described original
File, picture data group is into file data message, if non-first time generation and embedded signed data, then by last time generation
The destination file obtained by operation with embedded signed data is separated into previous signatures data and original document image data, and will
The original document image data and previous signatures data are combined into file data message in order；(4) number of files is calculated
According to the MD5 digest of message；(5) with MD5 digest described in the private key encryption of current signature person, with the person's number of signature that generates current signature
According to；(6) if generating for the first time and embedded signed data, then by the identifier of current signature person and current signature person's number of signature
According to signed data sequence is combined into, if non-first time generation and embedded signed data, then by previous signatures data, current label
The identifier and current signature person's signed data of name person is combined into signed data sequence；(7) blind watermatking embedded mobile GIS is used by institute
Signed data sequence is stated to be embedded into the original document image data and delete the current label from the signer list
Name person, is then returned to step (2).
2. the method according to claim 1 signed for digital document, it is characterised in that the step (A2) is further
Including：(1) original digital file for the electronic pictures form for having been inserted into signed data sequence is obtained from applications；(2) by institute
The original digital file for stating the electronic pictures form for having been inserted into signed data sequence is separated into signed data sequence and original document
Image data；(3) signer information list to be verified is built according to the sigverif allocation list, wherein, it is described to be tested
Signed certificate recipe information list includes the identifier nucleotide sequence and corresponding signer public key sequence of signer to be verified；(4) institute is judged
Whether be empty, if the signer information list to be verified is sky, terminate entirely to test if stating signer information list to be verified
Card process and the result are " being proved to be successful ", if the signer information list to be verified is not sky, obtain described
The identifier of first invalidated signer is as current signature party identifier in signer information list to be verified, and
The current signature party identifier position is searched in the signed data sequence, then by the original document image data
File data message is combined into order with the signed data before the current signature party identifier, and calculates the file
The MD5 digest of data message；(5) with signed data sequence described in the corresponding signer public key decryptions of the current signature party identifier
The signed data corresponding with the current signature party identifier in row, and by decrypted result and the file data that calculates
The MD5 digest of message is compared, if both are identical, the signed data of current signature side is proved to be successful, and is then treated from described
The information that current signature side is deleted in signer information list, and return to step (4) are verified, if both are different, terminates whole
Individual verification process and the result are " authentication failed ".
3. a kind of signing messages generating means, the signing messages generating means obtain the original of electronic pictures form from applications
Beginning digital document, and signed data sequence is generated according to md5 encryption algorithm, and the signed data sequence is embedded into described
In the original digital file of electronic pictures form；
Wherein, the signing messages generating means generate the signed data sequence and by the signed data sequence as follows
Row are embedded into the original digital file of the electronic pictures form：(1) the original of electronic pictures form is obtained from applications
Digital document and as original document image data；(2) whether be empty, if signer list is or not judging signer list
For sky, then using the first signer in the signer list is as current signature person and enters step (3), if signer is arranged
Table is sky, then terminates the generation of signed data sequence and telescopiny；(3) if generating for the first time and embedded signed data, then
By the original document image data composing document data message, if non-first time generation and embedded signed data, then will
Destination file obtained by last time generation and the operation of embedded signed data is separated into previous signatures data and original document figure
Sheet data, and the original document image data and previous signatures data are combined into file data message in order；(4) calculate
The MD5 digest of the file data message；(5) with MD5 digest described in the private key encryption of current signature person, to generate current signature
Person's signed data；(6) if generating for the first time and embedded signed data, then by the identifier and current signature of current signature person
Person's signed data is combined into signed data sequence, if non-first time generation and embedded signed data, then by previous signatures number
Signed data sequence is combined into according to, the identifier of current signature person and current signature person's signed data；(7) it is embedded in using blind watermatking
The signed data sequence is embedded into the original document image data and deletes institute from the signer list by algorithm
The person that states current signature, is then returned to step (2).
4. a kind of signing messages extracts checking device, the signing messages extracts checking device and has been inserted into label from applications acquisition
The original digital file of the electronic pictures form of name data sequence, and extracted and described in verifying according to sigverif allocation list
Signed data sequence, wherein, the sigverif allocation list includes the identifier and its corresponding label of each signer
Recipe public key；
Wherein, the signing messages extracts checking device and extracts as follows and verify the signed data sequence：(1) from outer
The original digital file for the electronic pictures form that portion has been inserted into signed data sequence using obtaining；(2) signature is had been inserted into by described
The original digital file of the electronic pictures form of data sequence is separated into signed data sequence and original document image data；(3)
Signer information list to be verified is built according to the sigverif allocation list, wherein, the signer information to be verified
List includes the identifier nucleotide sequence and corresponding signer public key sequence of signer to be verified；(4) signature to be verified is judged
Whether square information list is empty, if the signer information list to be verified is sky, terminates whole verification process and tests
It is " being proved to be successful " to demonstrate,prove result, if the signer information list to be verified is not sky, obtains the signer to be verified
The identifier of first invalidated signer is as current signature party identifier in information list, and in the signed data
The current signature party identifier position is searched in sequence, then by the original document image data and described current
Signed data before signature party identifier is combined into file data message in order, and calculates the file data message
MD5 digest；(5) with signed data sequence described in the corresponding signer public key decryptions of the current signature party identifier with it is described
The corresponding signed data of current signature party identifier, and by decrypted result and the MD5 of the file data message calculated
Summary is compared, if both are identical, the signed data of current signature side is proved to be successful, then from the signer to be verified
The information of current signature side, and return to step (4) are deleted in information list, if both are different, terminates whole verification process
And the result is " authentication failed ".
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210588467.3A CN103902925B (en) | 2012-12-31 | 2012-12-31 | The method and apparatus signed for digital document |
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| CN201210588467.3A CN103902925B (en) | 2012-12-31 | 2012-12-31 | The method and apparatus signed for digital document |
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| CN103902925B true CN103902925B (en) | 2017-08-25 |
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| CN104346581A (en) * | 2014-10-28 | 2015-02-11 | 国家电网公司 | Method and device for adding electronic seal on design diagram |
| CN106096335A (en) * | 2016-06-08 | 2016-11-09 | 北京小米移动软件有限公司 | Copyright information detection method, copyright information detection device and electronic equipment |
| CN106569865B (en) * | 2016-11-14 | 2020-04-10 | 青岛海信移动通信技术股份有限公司 | Method and device for manufacturing system upgrade file of terminal |
| CN106790607B (en) * | 2016-12-29 | 2020-11-03 | 北京奇虎科技有限公司 | Method and device for sending offline message |
| CN106921667A (en) * | 2017-03-06 | 2017-07-04 | 济南浪潮高新科技投资发展有限公司 | A kind of provision price control method, system and supervision center and grain purchases terminal |
| CN107844983B (en) * | 2017-10-31 | 2022-01-04 | 徐锐 | Information anti-counterfeiting identification method and system |
| US11818259B2 (en) | 2020-05-13 | 2023-11-14 | Ridgeline, Inc. | Query and projection processing for events |
| US11233640B2 (en) | 2020-05-13 | 2022-01-25 | Ridgeline, Inc. | Mutation processing for events |
| US11949784B2 (en) * | 2020-05-13 | 2024-04-02 | Ridgeline, Inc. | Auditing for events |
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| 基于小波域数字水印的有序多重签名方案;曲宝等;《大庆石油学院学报》;20070831;第31卷(第4期);正文第1.2节 * |
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| CN103902925A (en) | 2014-07-02 |
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