CN102799809B - Tamper-resistant system for electronic signature - Google Patents

Tamper-resistant system for electronic signature Download PDF

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Publication number
CN102799809B
CN102799809B CN201210202613.4A CN201210202613A CN102799809B CN 102799809 B CN102799809 B CN 102799809B CN 201210202613 A CN201210202613 A CN 201210202613A CN 102799809 B CN102799809 B CN 102799809B
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China
Prior art keywords
data
signature
pddl
document
tamper
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Expired - Fee Related
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CN201210202613.4A
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Chinese (zh)
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CN102799809A (en
Inventor
季云
蒋达央
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chen Jiao
Cui Guosheng
Fan Yonggang
Feng Shaowu
Gao Jing
Guo Youhua
Huang Zhiyong
Jiao Hongmei
Li Jinsuo
Li Ning
Li Qian
Li Ran
Li Shijie
Liu Guiqin
Liu Jinying
Liu Xiufen
Luo Jianhua
Mei Zhu
Pang Youjiang
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Individual
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Priority to CN201210202613.4A priority Critical patent/CN102799809B/en
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Publication of CN102799809B publication Critical patent/CN102799809B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention discloses a tamper-resistant system for an electronic signature. The tamper-resistant system for the electronic signature comprises a planning domain definition language (PDDL) conversion device, a picture generation device, a signature identification device and a portable document format (PDF) conversion device, wherein the PDDL conversion device is used for converting acceptance form data into the PDDL data; the picture generation device is used for generating an acceptance form picture according to the PDDL data; the signature identification device is used for identifying a handwritten signature of a user; and the PDF conversion device is used for converting the acceptance form picture which is signed by handwriting by the user into a PDF file. By defining a PDDL data protocol, supporting the generation of a general acceptance form data picture, and directly signing on the picture by handwriting, what you see is what you get, the signature is synthesized directly without storing signature data, so that the security of the signature is improved; paperless office and electronic data management are realized; and the aims of saving energy and reducing emission are fulfilled.

Description

A kind of tamper-resistant system for electronic signature
Technical field
The present invention relates to communication technical field, particularly relate to a kind of tamper-resistant system for electronic signature.
Background technology
The handwritten signature accepted based on intelligent terminal platform service requires to be applied to the handwritten signature on service handling list, finishing service accept confirmation.Prior art generally adopts peripheral hardware to provide support and is applied on unintelligent terminal platform, is not the handwritten signature of the platform based on intelligent terminal, and corresponding what mention is peripheral hardware or all need equipment support.
Such as, application number is CN201110255294, the Chinese patent application that denomination of invention is " a kind of pressure-induction handwriting display screen " discloses a kind of pressure-induction handwriting display screen, comprise flat-panel monitor, handwriting pad and writing pencil, flat-panel monitor comprises display panel and backboard, display panel is fixed on backboard, backboard has the opening matched with handwriting pad size, and handwriting pad to be embedded in opening and to be fixed on the bottom of display panel.Writing pencil is pressure sensitive writing pencil.Technique effect of the present invention is, handwriting pad is increased at the display screen back side, in the regulation region of display, use pressure sensi-tive pen effectively to sign electronically, hand-written book goes out to have the electronic signature of pressure sensitivity effect, make electronic signature the same with traditional handwritten signature effect, again reduce the operation cost of bank.It is simple that the present invention has structure, and have nature directly perceived, high reading speed and high precision, achieve the features such as trustworthy signature audit function, be applicable to various self-aided terminal, ATM, VTM machine.
Application number is CN200510027649, the Chinese patent application that patent name is " document digital signature and realize the method for E-seal and handwritten signature " discloses a kind of document digital signature and realizes the method for E-seal and handwritten signature, and wherein this digital signature method comprises secured environment initialization operation, generates the verification operation of digital signing operations and digital signature; The method of this E-seal comprises this signature of checking or stamped signature is effective, obtain current document needs the position of stamped signature, selects seal, inserts seal picture and carry out digital signature to document; The method of this handwritten signature comprise this signature of checking or seal effectively, start handwriting input device and initialization, to obtain from clipbook handwritten input information, selected insert handwritten signature position, handwritten input information inserted document, obtain certificate that active user holds, digital signature carried out to document.Adopt this kind of method, security is higher, and handwritten signature, together with digital signature tight binding, together constitutes a complete computer document secure certification architecture, enhances the scope of application, simultaneously fast very convenient to its operating process of user.
There is following defect in existing technical data transmission: 1) only provides peripheral hardware hardware supported, can not combine with existing intelligent terminal platform.2) can not support that general service handling free hand drawing sheet generates, to complete after Signature Confirmation integrally, What You See Is What You Get, the data of signature and original data can only be synthesized, may there is the risk that signed data is stolen, security also reduces greatly.
Summary of the invention
In order to solve the technical matters that in prior art, signed data security is lower, the present invention proposes a kind of tamper-resistant system for electronic signature, comprising:
PDDL conversion equipment, will accept forms data for data and be converted to PDDL data;
Photograph creation device, for accepting free hand drawing sheet according to PDDL data genaration;
Signature recognition device, for identifying the handwritten signature of user;
PDF conversion equipment, is converted to pdf document for the free hand drawing sheet that accepts after user is carried out handwritten signature.
Described photograph creation device, for resolving PDDL data; Judge whether that the overall situation is arranged, if so, the overall situation has been set, performed next step and judge, if not, directly performed next step and judge; Judge whether blocks of data device, if so, performed next step and judge, if not, generate and accept free hand drawing sheet; Judged whether blocks of data device, if so, carried out localized mass setting, rear execution next step, if not, directly perform next step; Get blocks of data, generate and accept free hand drawing sheet.
Described PDDL data comprise two parts, a part is that the overall situation is arranged, a part is that blocks of data and block are arranged, and concrete attribute kit contains: whether underscore, whether runic, whether highlight, font size, alignment thereof, line space, word space, accept single print What display mode for mark.
Described signature recognition device, for the coordinate by recording current touch screen point, in touch screen moving process, trigger current touch screen coordinate to change, and then draw from memory coordinate to this coordinate line, new record of laying equal stress on memory coordinate, the thickness of line passes through screen calculation of pressure, until touch screen terminates.
System also comprises encryption device, for being encrypted described PDF document, adopts hash value to calculate the MD5 value of PDF document; DES3 encryption is carried out to described MD5 value, obtains ciphertext; Ciphertext value is write in pdf document.
Described encryption device, for ciphertext being filled into latter 128 of document flow, filling less than 128, with special character and forming new document flow and write together in database, is formed one sign after document.
System also comprises calibration equipment, for verifying the PDF document after described encryption, takes out pdf document stream from database; By DES3 decrypting ciphertext, reduction generates MD5 value; Hash cryptographic hash calculation document MD5 value is adopted to remaining document flow; Relatively whether two MD5 values are identical, and as identical, then document is not tampered.
Described calibration equipment, takes out ciphertext for rear 128 characters from document flow, from 128, obtains ciphertext.
Tamper-resistant system for electronic signature of the present invention, by definition PDDL data protocol, support that the general forms data picture that accepts generates, and directly on picture, carry out handwritten signature, What You See Is What You Get, do not preserve signed data, direct synthesis, improves the security of signature, achieves non-support cable, electronization data management, reaches energy-saving and emission-reduction object.
Accompanying drawing explanation
Fig. 1 is the structural drawing of tamper-resistant system for electronic signature of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, the present invention proposes a kind of tamper-resistant system for electronic signature and comprises:
PDDL conversion equipment, will accept forms data for data and be converted to PDDL data;
Photograph creation device, for accepting free hand drawing sheet according to PDDL data genaration;
Signature recognition device, for identifying the handwritten signature of user;
PDF conversion equipment, is converted to pdf document for the free hand drawing sheet that accepts after user is carried out handwritten signature.
Described photograph creation device, for resolving PDDL data; Judge whether that the overall situation is arranged, if so, the overall situation has been set, performed next step and judge, if not, directly performed next step and judge; Judge whether blocks of data device, if so, performed next step and judge, if not, generate and accept free hand drawing sheet; Judged whether blocks of data device, if so, carried out localized mass setting, rear execution next step, if not, directly perform next step; Get blocks of data, generate and accept free hand drawing sheet.
Described PDDL data comprise two parts, a part is that the overall situation is arranged, a part is that blocks of data and block are arranged, and concrete attribute kit contains: whether underscore, whether runic, whether highlight, font size, alignment thereof, line space, word space, accept single print What display mode for mark.
Described signature recognition device, for the coordinate by recording current touch screen point, in touch screen moving process, trigger current touch screen coordinate to change, and then draw from memory coordinate to this coordinate line, new record of laying equal stress on memory coordinate, the thickness of line passes through screen calculation of pressure, until touch screen terminates.
System also comprises encryption device, for being encrypted described PDF document, adopts hash value to calculate the MD5 value of PDF document; DES3 encryption is carried out to described MD5 value, obtains ciphertext; Ciphertext value is write in pdf document.
Described encryption device, for ciphertext being filled into latter 128 of document flow, filling less than 128, with special character and forming new document flow and write together in database, is formed one sign after document.
System also comprises calibration equipment, for verifying the PDF document after described encryption, takes out pdf document stream from database; By DES3 decrypting ciphertext, reduction generates MD5 value; Hash cryptographic hash calculation document MD5 value is adopted to remaining document flow; Relatively whether two MD5 values are identical, and as identical, then document is not tampered.
Described calibration equipment, takes out ciphertext for rear 128 characters from document flow, from 128, obtains ciphertext.
Tamper-resistant system for electronic signature of the present invention, by definition PDDL data protocol, support that the general forms data picture that accepts generates, and directly on picture, carry out handwritten signature, What You See Is What You Get, do not preserve signed data, direct synthesis, improves the security of signature, achieves non-support cable, electronization data management, reaches energy-saving and emission-reduction object.
It is noted that above embodiment is only in order to illustrate the present invention and unrestricted, the present invention is also not limited in above-mentioned citing, and all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in right of the present invention.

Claims (7)

1. a tamper-resistant system for electronic signature, is characterized in that, comprising:
PDDL conversion equipment, will accept forms data for data and be converted to PDDL data;
Photograph creation device, for accepting free hand drawing sheet according to PDDL data genaration, described photograph creation device, for resolving PDDL data; Judge whether that the overall situation is arranged, if so, the overall situation has been set, performed next step and judge, if not, directly performed next step and judge; Judge whether blocks of data device, if so, performed next step and judge, if not, generate and accept free hand drawing sheet; Judged whether blocks of data device, if so, carried out localized mass setting, rear execution next step, if not, directly perform next step; Get blocks of data, generate and accept free hand drawing sheet;
Signature recognition device, for identifying the handwritten signature of user;
PDF conversion equipment, is converted to pdf document for the free hand drawing sheet that accepts after user is carried out handwritten signature.
2. tamper-resistant system for electronic signature according to claim 1, it is characterized in that, described PDDL data comprise two parts, a part is that the overall situation is arranged, a part is that blocks of data and block are arranged, concrete attribute kit contains: whether underscore, whether runic, whether highlight, font size, alignment thereof, line space, word space, accept single print What display mode for mark.
3. tamper-resistant system for electronic signature according to claim 1, it is characterized in that, described signature recognition device, for the coordinate by recording current touch screen point, in touch screen moving process, triggering current touch screen coordinate and changing, and then draw from memory coordinate to this coordinate line, new record of laying equal stress on memory coordinate, the thickness of line passes through screen calculation of pressure, until touch screen terminates.
4. tamper-resistant system for electronic signature according to claim 1, is characterized in that, also comprises encryption device, for being encrypted described PDF document, adopts hash value to calculate the MD5 value of PDF document; DES3 encryption is carried out to described MD5 value, obtains ciphertext; Ciphertext value is write in pdf document.
5. tamper-resistant system for electronic signature according to claim 4, it is characterized in that, described encryption device, for ciphertext being filled into latter 128 of document flow, fill the new document flow of formation to write together in database less than 128, with special character, form the document after a signature.
6. tamper-resistant system for electronic signature according to claim 4, is characterized in that, also comprises calibration equipment, for verifying the PDF document after described encryption, takes out pdf document stream from database; By DES3 decrypting ciphertext, reduction generates MD5 value; Hash cryptographic hash calculation document MD5 value is adopted to remaining document flow; Relatively whether two MD5 values are identical, and as identical, then document is not tampered.
7. tamper-resistant system for electronic signature according to claim 6, is characterized in that, described calibration equipment, takes out ciphertext, from 128, obtain ciphertext for rear 128 characters from document flow.
CN201210202613.4A 2012-06-19 2012-06-19 Tamper-resistant system for electronic signature Expired - Fee Related CN102799809B (en)

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CN102799809B true CN102799809B (en) 2015-01-28

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105139188A (en) * 2015-09-09 2015-12-09 西南大学 On-line electronic contract signing method based on mobile terminal
CN105117182B (en) * 2015-09-09 2018-10-30 西南大学 A kind of electronic signature system integration method based on virtual printing
CN106330459A (en) * 2016-08-25 2017-01-11 杭州天谷信息科技有限公司 Electronic keyword signature method
CN113282963B (en) * 2020-02-20 2023-04-07 中国移动通信集团重庆有限公司 Electronic signature verification method, device and equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101364294A (en) * 2008-09-28 2009-02-11 宇龙计算机通信科技(深圳)有限公司 Manually signing method and mobile terminal
CN101609488A (en) * 2008-06-18 2009-12-23 上海格尔软件股份有限公司 Electric endorsement method based on screen capture technology
CN101777058A (en) * 2009-12-08 2010-07-14 江苏省电力试验研究院有限公司 Document management system
CN101826013A (en) * 2010-03-31 2010-09-08 北京交通大学 Visual method of operation action in intelligent planning system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101609488A (en) * 2008-06-18 2009-12-23 上海格尔软件股份有限公司 Electric endorsement method based on screen capture technology
CN101364294A (en) * 2008-09-28 2009-02-11 宇龙计算机通信科技(深圳)有限公司 Manually signing method and mobile terminal
CN101777058A (en) * 2009-12-08 2010-07-14 江苏省电力试验研究院有限公司 Document management system
CN101826013A (en) * 2010-03-31 2010-09-08 北京交通大学 Visual method of operation action in intelligent planning system

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Co-patentee after: Li Shijie

Co-patentee after: Liu Guiqin

Co-patentee after: Liu Jinying

Co-patentee after: Liu Xiufen

Co-patentee after: Luo Jianhua

Co-patentee after: Mei Zhu

Co-patentee after: Pang Youjiang

Co-patentee after: Fan Yonggang

Co-patentee after: Feng Shaowu

Co-patentee after: Gao Jing

Co-patentee after: Guo Youhua

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20150128

Termination date: 20210619