CN110363027B - Electronic contract generation and electronic signature method - Google Patents
Electronic contract generation and electronic signature method Download PDFInfo
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- CN110363027B CN110363027B CN201910542374.9A CN201910542374A CN110363027B CN 110363027 B CN110363027 B CN 110363027B CN 201910542374 A CN201910542374 A CN 201910542374A CN 110363027 B CN110363027 B CN 110363027B
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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 generating an electronic contract, which comprises the following steps: dividing each line of the blank electronic contract paper into a non-content area and a content area; when the contract content is added on the electronic contract paper, calculating the check code of the content area of each line, and putting the check code into the non-content area of the line; writing check codes of all contract contents in the signature area; and writing check codes of all contract contents in the fingerprint area. The invention also provides an electronic signature method, which is used for carrying out signature on the electronic contract generated by the method. The method can ensure the continuity of the electronic contract paper and the consistency of the content, thereby preventing the contract content from being falsified; but also can ensure the safety of the electronic signature, so that the printed electronic contract has the effect of a paper contract.
Description
Technical Field
The invention relates to the field of electronic signatures, in particular to a method for generating an electronic contract and electronically signing the electronic contract.
Background
The contract is signed at present, and the contract is signed off line, namely face to face, the contract with the paper version is used, the content is written on the contract, and the signature and the seal are signed at the tail end and printed by hands. And moreover, the online electronic version of the signature is provided, some electronic signature contracts are that the first pages are contents, and the last page is provided with a place for a user to manually write a name on a screen, so that the contracts are easy to counterfeit. If how to ensure that the former pages of contents are not replaced when the electronic version contract is printed out, the printing cannot be ensured, and only when the electronic version contract is stored on a server, the security is ensured by the security of the server of the authority party.
The electronic contract is required on line sometimes, but the electronic contract is required to be printed sometimes, the paper and the electronic feel are different, the paper contract brings a formal feel, the security is also guaranteed, the electronic contract depends on the security of an on-line storage server, and the electronic contract is stored in a paper form after being printed, so that the physical security can be improved.
In summary, the current electronic contract has a hole in preventing the continuity of the electronic paper and the authenticity of the signature. For electronic signatures, encryption technologies such as algorithms are adopted at present to realize certificate signatures, and the electronic signatures have electronic signature effects but cannot meet the requirement that the electronic signatures have paper offline effects after being printed by electronic contractors.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a method for generating an electronic contract, ensures the continuity of electronic contract paper and can also ensure consistency, and also provides an electronic signature method, which not only ensures the safety of electronic signatures, but also has the offline effect of paper contracts after being printed.
In order to achieve the above object, the present invention provides a method for generating an electronic contract, the method including:
dividing each line of the blank electronic contract paper into a non-content area and a content area;
when the contract content is added on the electronic contract paper, calculating the check code of the content area of each line, and putting the check code into the non-content area of the line;
writing check codes of all contract contents in the signature area; and writing check codes of all contract contents in the fingerprint area.
As an improvement of the above method, the content area of each line of the blank electronic contract paper is divided into a plurality of small squares.
As an improvement of the above method, the calculating a check code for each content area specifically includes:
digitizing the contract contents using small squares; wherein, the occupied cells are represented by the number 1, and the unoccupied cells are represented by the number 0; the occupied small square grids mean that the characters falling into the small square grids reach one half and more than one half of the area of the small square grids; the small square grids which are not occupied are that the characters falling into the small square grids are smaller than one half of the area of the small square grids;
forming a number sequence by the numbers corresponding to all the small squares in one line;
and inputting the digital sequence into a check code algorithm, and calculating to obtain a check code.
As an improvement of the above method, the check codes of all contract contents are written in the signature area; the method specifically comprises the following steps:
s1) if the signature area can display the check codes of all contract contents, go to S3); otherwise, go to S2);
s2) taking a plurality of lines as a line, recombining the numbers corresponding to all the small squares in each line into a number sequence, recalculating the check code, and entering S3);
s3) corresponding 1 and 0 of all binary digits of the check code to the small squares of the content area of the signature area; the small squares with the number 1 are shown in grey and the small squares with the number 0 are shown in white.
As an improvement of the above method, the check codes of all contract contents are written in the fingerprint area; the method specifically comprises the following steps:
t1) if the fingerprint area can display the check codes of all contract contents, go to T3); otherwise, go to T2);
t2) taking a plurality of lines as a line, recombining the numbers corresponding to all the small squares in each line into a number sequence, recalculating the check code, and entering T3);
t3) corresponding 1's and 0's of all binary digits of the check code to the small squares of the content area of the fingerprint area; the small squares with the number 1 are shown in grey and the small squares with the number 0 are shown in white.
The invention also provides an electronic signature method for signing the electronic contract generated by the method, which comprises the following steps:
collecting the signature by using signature collection equipment, and calculating a Hash value H1 corresponding to the signature;
collecting fingerprints by using signature collection equipment; calculating a Hash value H2 corresponding to the fingerprint;
acquiring contract signing time, and calculating a Hash value H3 based on the contract signing time, the Hash value H1 and the Hash value H2;
and displaying the three hash values in a specified area of the electronic contract.
As an improvement of the method, the signature acquisition device is a mobile terminal with handwriting input and fingerprint input.
As an improvement of the above method, the signature acquisition device is used for acquiring the signature, and a Hash value H1 corresponding to the signature is calculated; the method specifically comprises the following steps:
acquiring signatures in a signature area displaying all check codes on signature acquisition equipment, and calculating the check codes of each line of small squares after superposition;
using the Hash algorithm, a Hash value H1 is calculated based on the check codes of all rows on the signature region.
As an improvement of the above method, the fingerprint is acquired by using a 'signature acquisition device'; calculating a Hash value H2 corresponding to the fingerprint; the method specifically comprises the following steps:
acquiring fingerprints in a fingerprint area displaying all check codes on signature acquisition equipment, and calculating the check codes of each line of small squares after superposition;
using the Hash algorithm, a Hash value H2 is calculated based on the check codes of all rows on the fingerprint area.
As an improvement of the above method, the method further comprises: the step of printing the electronic contract in a plaintext mode specifically comprises the following steps:
displaying small squares of each line of content area in the contract content;
displaying all check codes in the signature area by using a signature attached page, wherein the signature is displayed in an enlarged manner in the page;
displaying all check codes of the fingerprint area by using a fingerprint attached page, wherein the fingerprint is displayed in an enlarged mode in the page;
and printing contract content, a signature attached sheet and a fingerprint attached sheet.
As an improvement of the above method, the printing of the contract content, the signature cover sheet and the fingerprint cover sheet further comprises: the step of checking the contract specifically comprises the following steps:
counting a digital sequence formed by each line of small checks of the contract content, inputting a check code algorithm to obtain a check code, and comparing the check code with the check code displayed by the signature attached page and the fingerprint attached page in sequence;
counting a digital sequence formed by small squares in each line of the signature area, inputting a check code algorithm to obtain a check code, and calculating a Hash value H11 of the check codes in all the lines based on the Hash algorithm;
counting a digital sequence formed by small squares in each line of the fingerprint area, inputting a check code algorithm to obtain a check code, and calculating a Hash value H21 of the check codes in all the lines based on the Hash algorithm;
calculating a Hash value H31 based on the contract signing time, the Hash value H1 and the Hash value H2;
the three hash values H11, H21 and H31 are compared with the three hash values H1, H2 and H3 in the fingerprint page in sequence.
The invention has the advantages that:
1. the method can ensure the continuity of the electronic contract paper and the consistency of the content, thereby preventing the contract content from being falsified;
2. the method of the invention not only ensures the safety of the electronic signature, but also ensures that the printed electronic contract has the effect of a paper contract.
Drawings
FIG. 1 is a flow chart of a method of generating an electronic contract of the present invention;
fig. 2 is a flowchart of an electronic signature method of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
As shown in fig. 1, embodiment 1 of the present invention proposes a method for generating an electronic contract, the method including:
step 101) leaving a small part on the right side of the electronic contract paper as a non-content area;
the paper used in common is blank, some small squares need to be added on the blank paper, the small squares are just like pixel points, dense and dense hemp is displayed in a content area, the density of the small squares is not fixed, as long as the content written on the contract needs to be completely covered by the small squares, for example, if one square centimeter can write one word, the number of the small squares can reach 100, namely one square millimeter can be provided. In this way, a word is completely covered and each point falls into a corresponding cell. Different characters show different images, and for characters falling into the small square grid area, the area of the small square grid reaches one half or more than one half of the area of the small square grid, the small square grid is considered to be occupied, the area of the small square grid is less than one half of the area of the small square grid, and the small square grid is considered to be unoccupied. The occupied cells are indicated by the number 1 and the unoccupied cells are indicated by the number 0.
The selection of the number of the small squares has the criterion that the small squares can be clearly printed, so that when the printing definition does not meet the requirement, the number of the small squares can be reduced to the printing definition (for identification). With the development of printing technology, when a printer with higher resolution ratio is produced, the small checks can be printed clearly enough, and the number of the small checks can be increased to improve the precision.
If the electronic contract uses a4 paper size, the right side may be left 3 cm as a "non-content area" without the small squares described above. The "non-content area" may also be on the left side of the electronic contract paper.
Step 102) when writing electronic content on the electronic contract paper, calculating a check sum for each line, and putting the check sum to the rightmost side of the line, namely a non-content area of the step 101);
if a row of content is one centimeter high, then if the row of content is 15 centimeters high, at this time 1 centimeter high and 15 centimeters long, 15 square centimeters in total, that is, 1500 square millimeters, there will be 1500 small squares, and after the row is written with content, the content will be digitized using the small squares, that is, 101010000111, etc., there will be 1500 numbers, for which 1500 numbers, a Checksum is calculated, placed to the far right of the row; what is written on the left side of each row is content, and a small portion on the right side places Checksum.
By analogy, a sheet a4 is shown from top to bottom in this manner. The first sheet then has a page 001, which is the last line, and a Checksum is also counted. How many pages can be made as many pages of content are needed. After the content is written, the checksum of each page and each row is obtained. This Checksum has a check function to check whether the current content is continuous. If the contents in the middle are tampered with, then Checksum changes.
Currently, the algorithm for calculating the check code is a CRC algorithm, and the CRC algorithm is divided into a plurality of algorithms, such as CRC8, CRC16, and CRC32. For example, the CRC16 algorithm also has a plurality of polynomials, such as 0x8005 and 0x1021, which are numerical expressions and also functional polynomial expressions. The checksum algorithm is not limited to the CRC algorithm.
Step 103) reserving a certain signature area and a certain fingerprint area at the end of the electronic contract; writing check codes of all contract contents in the signature area; and writing check codes of all contract contents in the fingerprint area.
Just like a normal contract, there are parties a and B, or A, B, C at the end of the contract, etc. A certain area is reserved behind each party for displaying the signature and the fingerprint.
Example 2
After the electronic contract is generated by the above method, the contract needs to be signed.
The method in embodiment 1 ensures continuity of content parts, and after ensuring contents, it is necessary to confirm the contents, that is, a method of signature sealing off under line. On the line, the method can be realized by adopting a signature and fingerprint collection mode.
As shown in fig. 2, embodiment 2 of the present invention provides an electronic signature method, including:
step 201) using a 'signature acquisition device' to complete electronic signature;
when signing with the "signature capture device", the signature capture device displays the calculated checksums of the contents of the electronic contract, i.e., the signature over these checksums. There are two problems, the first is that Checksum is somewhat floating, because the content of a signed contract is sometimes more and sometimes less. The second problem is how Checksum is combined with signatures.
The "signature capture device" may be: a mobile terminal having handwriting input and fingerprint input. For example: provided is a mobile phone.
For the first problem, the Checksum is not fixed, which results in a problem that more and less are needed, the Checksum to be used can be adjusted according to the available area of the "signature acquisition device", for example, the signature acquisition device can also be as large as a4 paper, if the content of the contract is only three or four a4 papers, the Checksum can be completely displayed on the "signature acquisition device", if the content of the contract is more, the "signature acquisition device" cannot be displayed, a method of halving the Checksum is adopted, for example, the Checksum is doubled, and if the content of the contract is half of the Checksum, the Checksum can be completely displayed. Then two lines of Checksum are merged into one line and a new Checksum is computed using the Checksum algorithm as an input to both checksums, at which time the total Checksum is reduced to half.
If more are calculated, it is converted to one quarter, one eighth, etc. At this time the problem of the Checksum total is solved. Then there is also a problem how checksum can be combined with signatures.
Checksum is a string of numbers that is converted to binary, i.e., 1 and 0. In the "signature acquisition device", N small squares are divided, and 1 and 0 of the above-mentioned checksum binary digits are assigned to these small squares. The small squares with the number 1 are shown in grey and the small squares with the number 0 are shown in white. Then, a signature is placed on the top, and the name of the label occupies the small square. The Checksum for each row of tiles is then calculated in the manner described above, and if there are 100 rows of "signature input devices", there will be 100 checksums, at which time a Hash value H1 can be calculated for these checksums using the Hash algorithm. By this time the signature is complete.
Step 202), finishing fingerprint acquisition by using a signature acquisition device;
then, there is a fingerprint collection step, which corresponds 1 and 0 of the above-mentioned checksum binary digit to the small square of the "signature collection device". The small squares with the number 1 are shown in grey and the small squares with the number 0 are shown in white. The fingerprint is then captured on this top and also displayed in the small box described in "signature capture device". And calculating corresponding Checksum, and calculating a Hash value H2 for all Checksum, and finishing fingerprint acquisition.
Step 203) acquiring contract signing time, and calculating a Hash value H3 by the contract signing time and the Hash value H1 and the Hash value H2; displaying the three hash values at specified positions;
there is also a time when the contract is signed. The Hash value H1 and the Hash value H2 are added with the contract signing time, and three values are used as an input to calculate a Hash value H3 again. The designated location is the end of the electronic contract.
The 3 Hash values, H1, H2, H3, guarantee the uniqueness of the current content with the signature and also the fingerprint. This uniqueness can be done both on-line and off-line.
So far, a complete electronic contract is made, the integrity of the signing party of the contract and the integrity of the contract content are guaranteed, the authority of the signing party is guaranteed by the signature and the fingerprint, and the integrity of the contract content is guaranteed by the above-mentioned Checksum and Hash value.
Step 204), when the electronic contract is displayed in an electronic mode, displaying the signature and the fingerprint in a ciphertext mode;
however, for electronic versions, signatures and fingerprints may be plagiarized because the electronic version only needs original material, and the material can be enlarged to obtain clear signatures and fingerprints. Therefore, a method is needed to solve this problem, when signing a contract, an "authority Q1 providing electronic contract equipment" is needed, and when the authority needs to ensure that the contract is displayed electronically, the signature and the fingerprint are displayed in a ciphertext manner, that is, the electronic version of the contract, and the "plaintext form" of the signature and the fingerprint cannot be seen. The electronic version can be verified by using an online verification mode of an authority Q1, for example, Q1 issues a certificate to the contract, and the certificate is authenticated when being referred to in an electronic mode.
Step 205) when the electronic contract is printed, printing out the signature and the fingerprint in a plaintext mode.
When the contract is printed, the signature and fingerprint need to be printed in the clear. And the printed contract needs to clearly display the Checksum of the small squares and each row, and for the Checksum display in the aspect of signature and fingerprint, the Checksum display can be displayed in a page attachment mode, for example, the page attachment 1 is used for displaying all the checksums, then the signature is displayed in the page attachment 1 in an enlarged mode, the fingerprint is displayed in the page attachment 2 in an enlarged mode, and at this time, the page attachment completely displays the Checksum, and the signature and the fingerprint are also displayed in the page attachment.
Step 206) the paper contract is verified:
after the electronic contract is printed, the Checksum and hash values can be calculated in an observation mode, and then the integrity of the current contract can be verified. The fingerprint and the signature are both in a traditional font display mode and can be verified, and the method specifically comprises the following steps:
counting a digital sequence formed by each line of small checks of the contract content, inputting a check code algorithm to obtain a check code, and comparing the check code with the check code displayed by the signature attached page and the fingerprint attached page in sequence;
counting a digital sequence formed by small squares in each line of the signature area, inputting a check code algorithm to obtain a check code, and calculating the check codes in all the lines to obtain a Hash value H11;
counting a digital sequence formed by small squares in each line of the fingerprint area, inputting a check code algorithm to obtain a check code, and calculating the check codes in all the lines to obtain a Hash value H21;
calculating a Hash value H31 based on the contract signing time, the Hash value H1 and the Hash value H2;
and comparing the three hash values with three hash values H1, H2 and H3 in sequence.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method of generating an electronic contract, the method comprising:
dividing each line of the blank electronic contract paper into a non-content area and a content area;
when the contract content is added on the electronic contract paper, calculating the check code of the content area of each line, and putting the check code into the non-content area of the line;
writing check codes of all contract contents in the signature area; writing check codes of all contract contents in the fingerprint area;
the content area of each line of the blank electronic contract paper is divided into a plurality of small squares;
the calculating the check code of each content area specifically includes:
digitizing the contract contents using small squares; wherein, the occupied cells are represented by the number 1, and the unoccupied cells are represented by the number 0; the occupied small square grids mean that the characters falling into the small square grids reach one half and more than one half of the area of the small square grids; the small square grids which are not occupied are that the characters falling into the small square grids are smaller than one half of the area of the small square grids;
forming a number sequence by the numbers corresponding to all the small squares in one line;
and inputting the digital sequence into a check code algorithm, and calculating to obtain a check code.
2. The method for generating an electronic contract according to claim 1, wherein the check code of all contract contents is written in the signature area; the method specifically comprises the following steps:
s1) if the signature area can display the check codes of all contract contents, go to S3); otherwise, go to S2);
s2) taking a plurality of lines as a line, recombining the numbers corresponding to all the small squares in each line into a number sequence, recalculating the check code, and entering S3);
s3) corresponding 1 and 0 of all binary digits of the check code to the small squares of the content area of the signature area; the small squares with the number 1 are shown in grey and the small squares with the number 0 are shown in white.
3. The method for generating an electronic contract according to claim 1, wherein the check code of all contract contents is written in the fingerprint area; the method specifically comprises the following steps:
t1) if the fingerprint area can display the check codes of all contract contents, go to T3); otherwise, go to T2);
t2) taking a plurality of lines as a line, recombining the numbers corresponding to all the small squares in each line into a number sequence, recalculating the check code, and entering T3);
t3) corresponding 1's and 0's of all binary digits of the check code to the small squares of the content area of the fingerprint area; the small squares with the number 1 are shown in grey and the small squares with the number 0 are shown in white.
4. An electronic signature method for signing an electronic contract generated by the method of one of claims 1-3, the method comprising:
collecting the signature by using signature collection equipment, and calculating a Hash value H1 corresponding to the signature;
collecting fingerprints by using signature collection equipment; calculating a Hash value H2 corresponding to the fingerprint;
acquiring contract signing time, and calculating a Hash value H3 based on the contract signing time, the Hash value H1 and the Hash value H2;
and displaying the three hash values in a specified area of the electronic contract.
5. The electronic signature method as claimed in claim 4, wherein the signature capture device is a mobile terminal having handwriting input and fingerprint input.
6. The electronic signature method as claimed in claim 4 or 5, wherein the signature is collected by using a signature collecting device, and a Hash value H1 corresponding to the signature is calculated; the method specifically comprises the following steps:
acquiring signatures in a signature area displaying all check codes on signature acquisition equipment, and calculating the check codes of each line of small squares after superposition;
using the Hash algorithm, a Hash value H1 is calculated based on the check codes of all rows on the signature region.
7. The electronic signature method as claimed in claim 4 or 5, wherein the fingerprint is acquired using a "signature acquisition device"; calculating a Hash value H2 corresponding to the fingerprint; the method specifically comprises the following steps:
acquiring fingerprints in a fingerprint area displaying all check codes on signature acquisition equipment, and calculating the check codes of each line of small squares after superposition;
using the Hash algorithm, a Hash value H2 is calculated based on the check codes of all rows on the fingerprint area.
8. The electronic signature method of claim 4, wherein the method further comprises: the step of printing the electronic contract in a plaintext mode specifically comprises the following steps:
displaying small squares of each line of content area in the contract content;
displaying all check codes in the signature area by using a signature attached page, wherein the signature is displayed in an enlarged manner in the page;
displaying all check codes of the fingerprint area by using a fingerprint attached page, wherein the fingerprint is displayed in an enlarged mode in the page;
and printing contract content, a signature attached sheet and a fingerprint attached sheet.
9. The electronic signature method as claimed in claim 8, wherein the step of printing the contract content, the signature cover sheet and the fingerprint cover sheet further comprises: the step of checking the contract specifically comprises the following steps:
counting a digital sequence formed by each line of small checks of the contract content, inputting a check code algorithm to obtain a check code, and comparing the check code with the check code displayed by the signature attached page and the fingerprint attached page in sequence;
counting a digital sequence formed by small squares in each line of the signature area, inputting a check code algorithm to obtain a check code, and calculating a Hash value H11 of the check codes in all the lines based on the Hash algorithm;
counting a digital sequence formed by small squares in each line of the fingerprint area, inputting a check code algorithm to obtain a check code, and calculating a Hash value H21 of the check codes in all the lines based on the Hash algorithm;
calculating a Hash value H31 based on the contract signing time, the Hash value H1 and the Hash value H2;
the three hash values H11, H21 and H31 are compared with the three hash values H1, H2 and H3 in the fingerprint page in sequence.
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