CN112100687A - Method for supporting electronic contract signing of attachments in various formats - Google Patents
Method for supporting electronic contract signing of attachments in various formats Download PDFInfo
- Publication number
- CN112100687A CN112100687A CN202010989568.6A CN202010989568A CN112100687A CN 112100687 A CN112100687 A CN 112100687A CN 202010989568 A CN202010989568 A CN 202010989568A CN 112100687 A CN112100687 A CN 112100687A
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- Prior art keywords
- electronic contract
- attachments
- text
- attachment
- signature
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/10—Services
- G06Q50/18—Legal services; Handling legal documents
Abstract
The invention provides a method for supporting electronic contract signing of attachments in various formats, which comprises the following steps: s1: the signing party logs in the electronic contract signing system, uploads the electronic contract text and uploads all attachments of the electronic contract in sequence, and the file name of each attachment is contained in the electronic contract text; s2: each attachment carries out SHA256 abstract of the whole text, the file name of each attachment and the corresponding SHA256 abstract value form a content list of the attachment, and the content lists of all the attachments are assembled into an abstract list of the attachment; s3: carrying out digital signature on the text of the electronic contract, and setting a summary list of the electronic contract attachments in an extension field of a signature domain; s4: carrying out SHA256 abstract of the whole text of the electronic contract and making a digital certificate signature; s5: and compressing the electronic contract text with the digital signature and the electronic contract attachment into a file packet, and sending the file packet to a service party.
Description
Technical Field
The invention relates to an electronic contract signing method, in particular to an electronic contract signing method supporting attachments in various formats.
Background
The electronic contract basically exists in a PDF format, and the electronic contract is basically signed on an electronic file in the PDF format. An electronic contract may contain some accessories, for example, a house renting and selling contract may contain a plurality of house engineering drawings, and some types of electronic contracts may contain some accessories in a video format. The attachment in the format is converted into the PDF or embedded into the electronic contract in the PDF format, so that at present, certain technical difficulty exists, and even if the attachment is converted into the PDF, the attachment has distortion or some details are missing, and the most original content cannot be restored. This makes it impossible to sign the digital certificate together with the electronic contract attached when the electronic contract is signed.
The main defects are as follows: the effectiveness of the electronic contract should be based on the body of the electronic contract as well as the attachments. If the attachments of the electronic contract are not signed together by the digital certificate, the anti-tampering of the attachments of the electronic contract cannot be ensured, and if the attachments of the electronic contract are possibly tampered, the meaning of digitally signing the text of the electronic contract is very small.
Disclosure of Invention
The invention provides a method for supporting the signing of electronic contracts of attachments in various formats, which solves the problems that the digital signature can be carried out on the text of the electronic contract on the basis of keeping the original format of the attachments of the electronic contract, and the text and the attachments of the whole electronic contract can be tamperproof at the same time, and the technical scheme is as follows:
a method of electronic contract signing support for attachments in various formats, comprising the steps of:
s1: the signing party logs in the electronic contract signing system, uploads the electronic contract text and uploads all attachments of the electronic contract in sequence, and the file name of each attachment is contained in the electronic contract text;
s2: carrying out full-text SHA256 abstract on each attachment, wherein the file name of each attachment and the corresponding SHA256 abstract value form a content list of the attachment, and the content lists of all the attachments are assembled into an abstract list of the attachment;
s3: carrying out digital signature on the text of the electronic contract, and setting a summary list of the electronic contract attachments in an extension field of a signature domain;
s4: performing full-text SHA256 abstract on the text of the electronic contract and making a digital certificate signature;
s5: and compressing the electronic contract text with the digital signature and all the accessories into a file packet, and sending the file packet to a service party.
Further, in step S3, when the electronic contract body is digitally signed, a signature field is created in the seal area selected by the user, and the signed information is set in the signature field.
Further, in step S4, when the digital certificate is signed, the user' S digital certificate is used to sign the body abstract of the electronic contract, and the signature value is updated to the signature field, thereby completing the signing of the electronic contract.
Further, when the service party performs the electronic contract verification, the contents to be verified include: (1) validity of the electronic contract digital certificate; (2) validity of the digital signature; (3) comparing the abstracts of the text of the electronic contract; (4) and comparing the abstracts of the electronic contract attachments.
Further, the abstract comparison of the electronic contract attachment is to perform the abstract again on the electronic contract attachment and simultaneously perform the comparison with an attachment abstract list stored in the signature domain.
Further, all verification passes, which indicates that the electronic contract is valid, otherwise, the electronic contract is invalid.
The accessory is not limited in type.
The method for supporting the electronic contract signing of attachments in various formats has the following advantages: 1. the attachment of the electronic contract is relatively independent from the electronic contract, and the attachment does not need to be inserted into the text of the electronic contract and does not need to be converted into the PDF type electronic contract; 2. the method can judge whether the electronic contract text and the attachment are falsified on the basis of the digital signature carried out on the electronic contract text.
Drawings
FIG. 1 is a schematic flow diagram of the method of electronic contract signing supporting attachments of various formats.
Detailed Description
As shown in fig. 1, the method for electronic contract signing supporting attachments of various formats comprises the following steps:
s1: when the electronic contract text is simulated, the attachments are sequenced, and the file names of the attachments are contained in the content of the electronic contract text;
s2: before carrying out digital signature on the text of the electronic contract, carrying out SHA256 abstract of the whole text of each attachment, the file name of each attachment and the corresponding SHA256 abstract value to form a content list of the attachment, wherein the content list of all the attachments is assembled into an abstract list of 1 attachment for standby, and the abstract list is in a form of { "attachment 1": "Hash 1", "attachment 2": "Hash 2" … … };
s3: and (3) carrying out digital signature on the electronic contract text: creating a signature domain, setting seal information, setting the abstract list obtained in the step S2 in an extended field Contact of the signature domain, and then carrying out full-text abstract on the text of the electronic contract and making a digital certificate signature; the signature domain is an area where the operated user signs in a seal falling area of the text of the electronic contract at this time;
s4: after the electronic contract is signed, the electronic contract text with the digital signature and the electronic contract attachment are packed into a compressed packet, so that the electronic contract is convenient to distribute;
s5: when the electronic contract is checked, besides the need of checking the validity and signature validity of the digital certificate of the electronic contract and comparing the abstract of the text of the electronic contract to judge whether the electronic contract is tampered, the electronic contract is subjected to one SHA256 abstract again, and then the abstract is compared with an abstract list of the attachments stored in a signature domain.
If all the checks pass, the electronic contract is valid, otherwise, the electronic contract is invalid.
In the following specific examples:
1. the electronic contract signing party user logs in the system;
2. uploading the text of the electronic contract first, and then sequentially uploading all the accessories of the electronic contract;
3. clicking contract signing to display a page of the text of the electronic contract;
4. selecting a seal and dragging the seal to a sealing area;
5. and clicking to confirm, and starting to carry out digital certificate signature of the electronic contract by the back end:
firstly, reading all attachments of the electronic contract, performing SHA256 abstract of the whole text on each attachment, and forming an abstract list of the attachments of the electronic contract by using each attachment name in the electronic contract and the SHA256 abstract value corresponding to each attachment.
Secondly, performing digital signature of the text of the electronic contract, creating a PDF signature domain in a stamping area selected by a user, setting signed information such as information of a stamp in the signature domain, and setting a summary list of electronic contract accessories in an extended field Contact of the signature domain;
thirdly, SHA256 abstract is carried out on the text of the electronic contract, the abstract of the text of the contract is signed by using a digital certificate of a user, and the signature value is updated to a signature domain to finish the signing of the electronic contract.
6. Compressing the electronic contract text with the digital signature and the attachment of the electronic contract into a file packet, and conveniently sending the file packet to a service party;
7. when the electronic contract is verified, firstly, the validity of the signature certificate is verified (the validity period of the signature certificate is not expired, and the signature certificate is not revoked), secondly, the validity of the digital signature is verified (the signature value is verified to be passed), secondly, the abstract comparison of the electronic contract text is performed (the abstract comparison of the electronic contract text and the abstract taken out from the signature domain is performed), and finally, the abstract comparison of the electronic contract attachment is performed (the electronic contract attachment is subjected to the abstract again and is compared with an attachment abstract list stored in the signature domain), wherein if the verification is successful, the digital signature of the electronic contract is valid, and otherwise, the electronic contract is invalid.
In the method for signing the electronic contract supporting the attachments in various formats, the attachments of the electronic contract are relatively independent from the text of the electronic contract, and the attachments are not inserted into the text of the electronic contract and are not converted into the PDF type electronic contract; the method can judge whether the electronic contract text and the attachment are falsified on the basis of the digital signature carried out on the electronic contract text.
Claims (7)
1. A method of electronic contract signing support for attachments in various formats, comprising the steps of:
s1: the signing party logs in the electronic contract signing system, uploads the electronic contract text and uploads all attachments of the electronic contract in sequence, and the file name of each attachment is contained in the electronic contract text;
s2: carrying out full-text SHA256 abstract on each attachment, wherein the file name of each attachment and the corresponding SHA256 abstract value form a content list of the attachment, and the content lists of all the attachments are assembled into an abstract list of the attachment;
s3: carrying out digital signature on the text of the electronic contract, and setting a summary list of the electronic contract attachments in an extension field of a signature domain;
s4: carrying out full-text SHA256 abstract on the text of the electronic contract and making a digital certificate signature;
s5: and compressing the electronic contract text with the digital signature and all the accessories into a file packet, and sending the file packet to a service party.
2. The method of electronic contract signing support for attachments in various formats as recited in claim 1, wherein: in step S3, when digitally signing the text of the electronic contract, a signature field is created in the stamp area selected by the user, and the signed information is set in the signature field.
3. The method of electronic contract signing support for attachments in various formats as recited in claim 1, wherein: in step S4, when the digital certificate signs, the digital certificate of the user is used to sign the abstract of the electronic contract text, and the signature value is updated to the signature domain to complete the signing of the electronic contract.
4. The method of electronic contract signing support for attachments in various formats as recited in claim 1, wherein: when the business side verifies the electronic contract, the contents to be verified comprise: (1) validity of the electronic contract digital certificate; (2) validity of the digital signature; (3) comparing the abstracts of the text of the electronic contract; (4) and comparing the abstracts of the electronic contract attachments.
5. The method of electronic contract signing support for attachments in various formats as recited in claim 4, wherein: the abstract comparison of the electronic contract attachment is to perform the abstract of the electronic contract attachment again and simultaneously perform the comparison with an attachment abstract list stored in the signature domain.
6. The method of electronic contract signing support for attachments in various formats as recited in claim 4, wherein: and verifying that all the checks are passed, wherein the electronic contract is valid, and otherwise, the electronic contract is invalid.
7. The method of electronic contract signing support for attachments in various formats as recited in claim 1, wherein: the accessory is not limited in type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010989568.6A CN112100687B (en) | 2020-09-18 | 2020-09-18 | Method for supporting electronic contract signing of attachments in various formats |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010989568.6A CN112100687B (en) | 2020-09-18 | 2020-09-18 | Method for supporting electronic contract signing of attachments in various formats |
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| Publication Number | Publication Date |
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| CN112100687A true CN112100687A (en) | 2020-12-18 |
| CN112100687B CN112100687B (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010989568.6A Active CN112100687B (en) | 2020-09-18 | 2020-09-18 | Method for supporting electronic contract signing of attachments in various formats |
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| US20040181756A1 (en) * | 2000-06-06 | 2004-09-16 | Berringer Ryan R. | Creating and verifying electronic documents |
| CN101022339A (en) * | 2007-03-23 | 2007-08-22 | 郭传真 | Electronic sign stamp identifying method combined with digital centifi cate and stamp |
| CN102024002A (en) * | 2009-09-10 | 2011-04-20 | 上海中信信息发展股份有限公司 | Safe storage method and system of filing of electronic documents |
| CN103259665A (en) * | 2013-05-28 | 2013-08-21 | 福建伊时代信息科技股份有限公司 | Method and system of electronic signature |
| CN104166936A (en) * | 2014-08-14 | 2014-11-26 | 江苏买卖网电子商务有限公司 | Electronic contract storage and validation method |
| US20180316509A1 (en) * | 2016-01-05 | 2018-11-01 | Agreement Express Inc. | Method and System for Authentication of Electronic Documents |
| CN109831302A (en) * | 2017-11-23 | 2019-05-31 | 杭州天谷信息科技有限公司 | PDF electronic signature method and system based on national secret algorithm |
-
2020
- 2020-09-18 CN CN202010989568.6A patent/CN112100687B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040181756A1 (en) * | 2000-06-06 | 2004-09-16 | Berringer Ryan R. | Creating and verifying electronic documents |
| CN101022339A (en) * | 2007-03-23 | 2007-08-22 | 郭传真 | Electronic sign stamp identifying method combined with digital centifi cate and stamp |
| CN102024002A (en) * | 2009-09-10 | 2011-04-20 | 上海中信信息发展股份有限公司 | Safe storage method and system of filing of electronic documents |
| CN103259665A (en) * | 2013-05-28 | 2013-08-21 | 福建伊时代信息科技股份有限公司 | Method and system of electronic signature |
| CN104166936A (en) * | 2014-08-14 | 2014-11-26 | 江苏买卖网电子商务有限公司 | Electronic contract storage and validation method |
| US20180316509A1 (en) * | 2016-01-05 | 2018-11-01 | Agreement Express Inc. | Method and System for Authentication of Electronic Documents |
| CN109831302A (en) * | 2017-11-23 | 2019-05-31 | 杭州天谷信息科技有限公司 | PDF electronic signature method and system based on national secret algorithm |
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| Publication number | Publication date |
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| CN112100687B (en) | 2021-08-13 |
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