CN1635533A - Digital stamp system - Google Patents
Digital stamp system Download PDFInfo
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- CN1635533A CN1635533A CN 200310109857 CN200310109857A CN1635533A CN 1635533 A CN1635533 A CN 1635533A CN 200310109857 CN200310109857 CN 200310109857 CN 200310109857 A CN200310109857 A CN 200310109857A CN 1635533 A CN1635533 A CN 1635533A
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- China
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- document
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- sealing
- seal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N2201/3201—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N2201/3225—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to an image, a page or a document
- H04N2201/3233—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to an image, a page or a document of authentication information, e.g. digital signature, watermark
- H04N2201/3236—Details of authentication information generation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N2201/3201—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N2201/3269—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs
- H04N2201/327—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs which are undetectable to the naked eye, e.g. embedded codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N2201/3201—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N2201/3271—Printing or stamping
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Editing Of Facsimile Originals (AREA)
- Image Processing (AREA)
Abstract
This invention provides a digit stamp system generated and validated in the electron file and paper file, which adopts two value image digit water stamp formula to generate the digit stamp and imbedded it to the original designed position of the digit signing generation device. The system imbedded the digit singing information toe h general stamp image through the technique and combines the electron stamp legibility and the traditional stamp legibility.
Description
Technical field
The present invention relates to digital signature and digital certificate technology, particularly the seal system of electronic document and paper document.
Background technology
In the evolution of Chinese traditional history, sign or affix one's private mark, the anti-chapter of seal and official all playing the part of quite important role.Though be in the past the early stage bill financial system of China it " fly money " or " official prevents great seal " of office of yamen, even the seal of scholar poet " collected books chapter " or present government bodies, in order to show identity and to set up transaction order, all created " affixing one's seal " system, allowed " affixing one's seal " can have the effectiveness identical with " signature ".
But at present the phenomenon of falsification of public seal happens occasionally, and the imperfection of this and official seal anti-counterfeiting technology is closely related.Anyone is easy to carve the seal that resembles the picture sample and comes out.
See that technically seal designs is simple in structure, font specification, this makes falsification of public seal become easy.And present all anti-counterfeit method for stamp can not tackle the problem at its root.
In the information age of 21st century, popularizing of factor word and network, for reach with actual life in the said function of " signature " or " affixing one's seal " that use, promptly have the identity identification function and can confirm the method for declaration of will, so people have invented " digital signature " (Digital Signature) or " electronic signature " (ElectronicSignature) or title " Electronic Signature " in order to reach the same with sign or seal.
The security of digital signature beyond any doubt.But affixing one's seal is China's history custom for a long time, and present stage, real Applied Digital was signed, and still the shortcoming custom is done backing.Therefore how digital signature is applied on the paper document in the daily mode of being loved of people, to satisfy the custom that Chinese tradition is affixed one's seal and authenticated, this problem need be resolved technically.
Chinese patent (application number: 96122615.3) provide a kind of automatic contrast and identification system of general physics seal.This system contrasts the seal of desire checking automatically with the original seal that system is preserved, in order to the true and false of differentiation traditional seal.But just relatively whether true and false physical seal is consistent automatically on physical form in this system, then do not possess the phenomenon of taking precautions against the seal forgery when falsification of seal and original true seal are closely similar.
Method that the patent of U.S.Patent No.5388158 (1995) is described and device are the literal message informations with document, through overcompression, scrambled is a two-dimensional bar code or similar form, use public key algorithm, realize producing safely and differentiating of paper document.The two-dimensional bar code that comprises enciphered message deviates from " affixing one's seal is the permanent custom of Chinese history " this phenomenon in actual use fully, does not possess seal shape commonly used, lacks use habit.Bar code information is recessive for the user, and the user can't directly directly obtain relevant authentication information from bar code.
Application number is that 2001037455 (2001) United States Patent (USP) has disclosed a kind of object discrimination method and device that comprises coding characteristic.Coded message is the inscape of digital watermarking object.The coding characteristic of object also is used as the key of understanding digital watermark information.Digital watermarking is combined in the bar code.By key, the bar code number watermark information can decrypted and extraction.The shortcoming of the shortcoming of this method and U.S.Patent No.5388158 institute descriptive system is similar, also is the shape that does not possess the actual physics seal, thereby lacks the support of use habit.
Application number is 2002080996 (2002) U.S. Patent Publication a kind ofly is encoded into machine readable multidigit binary message (as digital watermark) in false proof document of needs (for example passport, currency, bill) etc., and its existence of not perception of reader.Visible or potential verification pattern is written into these documents.When this document is scanned (as photoprinter),, but still can detect pattern although possibility is scaled or rotation.The verification pattern can be used as the carrier of digital watermark information, also can the absolute coding digital watermarking.The passport treating apparatus can obtain the information data about the passport possessor by the binary data of decoding.Some device can detect exist (for example document publisher's the E-seal) of digital watermark data and visible structure simultaneously.This method embed watermark information in document, but watermark information does not combine with digital signature technology, lacks reliable authentication method.In this external document authentication mechanism, adopt the Chinese seal designs of being accustomed to, and be as watermark carrier with common image.
Chinese patent (application number: 99816827.0) described a kind of a kind of method and apparatus of protecting electronic media and paper medium document legitimacy.The document comprises document content, an E-seal that is used to differentiate document, and this seal comprises the visible seal of a management organization and embeds the document content summary in the seal and a kind ofly append to described sensitization or the photosensitive composition of being differentiated document.The E-seal that this patent adopted comprises the digital signature information of document.But for signing messages can be extracted from the paper copies version of document, adopt specific sensitization or photosensitive composition, rather than in the pattern of seal own embed watermark or secure authenticated information, and relevant information is embedded in the special photosensitive material, increase application cost and inconvenience.
Chinese patent (application number: the 01132372.8) digital anti-fake method of the employing binary image watermarking technology of a novelty of proposition.The binary image watermarking technology of robust is applied to two-value/multivalue image,, can solves the true and false authentication function of electronic document and paper document in conjunction with digital signature technology.But this method does not provide complete system, solution, device and product for document authentication and transmission.
Summary of the invention
The purpose of this invention is to provide a kind of digital sealing system that can in electronic document and paper document, generate and verify.
To achieve these goals, digital sealing provided by the invention system comprises:
The document extraction element that the key content of original document is extracted;
The key of receiving system authentication center adopts public key algorithm the key content of the original document of document extraction element to be carried out the digital signature generating apparatus of digital signature;
Adopt the bianry image digital watermarking algorithm to generate the digital sealing generating apparatus of digital sealing;
The digital signature of digital signature generating apparatus is embedded into above-mentioned digital sealing generating apparatus
Watermark flush mounting in the digital sealing that produces; And
The digital sealing attachment device that the above-mentioned digital sealing that has digital signature is added the assigned address of original document.
Further, digital sealing provided by the invention system also comprises an authenticate device, and this device comprises:
The seal image extraction element that the seal image of the document that comprises digital sealing is extracted;
The document content extraction element that the document content of the document that comprises digital sealing is extracted;
With the binary image watermarking algorithm seal image of seal image extraction element is carried out the watermark information extraction element that watermark information (digital signature information) extracts;
The key that receiving system authentication center signs and issues, the demo plant of verifying according to the document information of the watermark information of above-mentioned watermark information extraction element and above-mentioned document content extraction element.
Digital sealing provided by the invention system is owing to be that digital signature information with document is by specific binary image watermarking technology (Chinese patent: a kind of digital anti-fake method; 01132372.8) be embedded in the common seal image; promptly on electronic document and paper document, add the digital sealing that comprises the safety certification function; the safety certification and the false proof side that play document distort function; and satisfy people's daily use habit; the legitimacy of Electronic Signature and the legitimacy of traditional seal are combined, and can protect and authenticate the legitimacy of the corresponding paper document of electronic document and output thereof.
" application of digital sealing provided by the invention system can overcome present digital signature technology and can only be applied to e-file, then can't provide same security function with the form that people were known well to ordinary file.Under the situation that ecommerce is not at present also popularized, most normal document and agreement still need affixing one's seal of physical property, and this makes the application of digital signature receive great restriction.A feasible solution utilizes digital watermark technology digital signature seamlessly to be fused in " digital sealing " exactly, thereby make " digital signature " with numeral or papery form exist with file on, guaranteeing simultaneously in the document security authentication that realizes digital signature, satisfy the use habit that compatriots affix one's seal to tradition, thereby overcome the defective of present existing system.
Description of drawings
Figure 1A～Fig. 1 E is the synoptic diagram of digital sealing image;
Fig. 2 is the document synoptic diagram with true and false authentication function that comprises the digital sealing part;
Fig. 3 A comprises the electronic document of digital sealing and the synoptic diagram of paper document copy thereof for producing one;
Fig. 3 B is the hardware configuration synoptic diagram of the described watermark flush mounting of Fig. 3 A;
Fig. 4 A differentiates the true and false of the electronic document that comprises digital sealing and the synoptic diagram of legitimacy authentication;
Fig. 4 B is the hardware configuration synoptic diagram of the described watermark extraction apparatus of Fig. 4 A;
The true and false and the legitimacy authentication synoptic diagram of Fig. 5 for differentiating the paper document that comprises digital sealing;
Fig. 6 is the synoptic diagram of how making, transmitting and carry out true and false authentication for the document of explanation digital sealing provided by the invention system.
Below in conjunction with accompanying drawing the present invention is further described.
Figure 1A represents an original seal image that does not add any information.Usually, seal image derives from digital picture scanning copy or other video generation device of image making software, general physics seal.This seal image 101 is guaranteed the habituation of people in use as the mother matrix of digital sealing.
Figure 1B represents the digital sealing image that comprises digital watermark information (being digital signature information) of digital sealing provided by the invention system.This digital sealing image 102 comprises two parts: first characterizes significant visible seal image, and the elementary identification function of seal is provided; Second portion is the digital signature information that is embedded in the image, is used for differentiating the true and false of document, judges its integrality, non-distorting property and legitimacy.
Fig. 1 C represents that the papery of the digital sealing image 102 of Figure 1B duplicates version 103, and promptly digital sealing image 102 outputs to and obtains this duplicatings editions 103 on the paper through printing (or printing) equipment.Digital sealing image 103 on the paper is the same with digital sealing image 102, also include two same parts: significant seal and the digital signature that is embedded in the seal, this illustrates that digital sealing provided by the invention system makes paper document also can differentiate the true and false of document by being embedded in digital signature in the seal, judges its integrality, non-distorting property and legitimacy.
Fig. 1 D represents other representation of digital sealing, and for example, the original image 104 of a people's signature is not adding any extraneous information, can do the sign effect of signature to file, and also as the mother matrix of digital sealing.
Fig. 1 E is the digital signature information that embeds document in the described original image 104 of presentation graphs 1D, and outputs to the seal image 105 on the paper through printing (or printing) equipment.The seal image 105 that includes digital signature except playing the sign effect of file signature, but also really has the true and false of differentiating document, judges functions such as its integrality, non-distorting property and legitimacy.
Fig. 2 is the document synoptic diagram with true and false authentication function that comprises the digital sealing part.As shown in the figure, document that comprises digital sealing of expression in the wire frame 210, the document comprises with the lower part:
(1) document content information 211;
(2) comprise digital sealing to 211 digital signature information of being done.
Digital sealing can be common common seal 212---the shape of seal is not limit (as circle, ellipse, rectangle, triangle etc.), the inner represented structure of seal is not limit (as company's seal, individual stamped signature etc.) yet, the seal content is not limit (if any " Axu Digit Technology Co., Ltd., Shanghai " printed words, or other unit printed words etc.);
Digital sealing also can be the handwritten signature image 215 that comprises digital signature.
Digital sealing can also be a Company Logo 213; The header of document/footer line 214; And digital watermarking bar code 215, these forms of expression are that 02110959.1 Chinese patent is open at application number, are not describing in detail here.
Fig. 3 A is that digital sealing of the present invention system produces one and comprises the electronic document of digital sealing or the synoptic diagram of paper document copy.This system comprises:
(1) the document content extraction element 311 of original document 310;
(2) the digital signature generating apparatus 313 of making document content digital signature;
(3) access control apparatus 315 of original seal image;
(4) the digital watermarking flush mounting 316;
(5) the digital sealing adding apparatus 318;
(6) paper document of the document 319 of electronic form duplicates the print control unit 322 and the print-out device 321 of (copy).
Wherein, in the system of reality, document content extraction element 311, digital signature module 313, watermark flush mounting 316, according to tick lables original document additional character seal module 318 and printout module 320 and printing control model 322 have been constituted one and add a cover digital sealing device 300, it can an integrated device.And in actual applications, modular integrating device 300 can directly generate the document of adding a cover digital sealing of electronic form or paper-based form behind input original document, original seal image, access control information and key.
Key 312, original seal image 314, seal access control apparatus 315 and seal access control information 317 can be integrated in the E-Intelligent key 301 of a USB flash disk size, E-Intelligent key and the integrated exchanges data of adding a cover digital sealing device 300 can be finished (as USB, serial ports, parallel port, infrared interface etc.) by communication interface commonly used, but they also can be stored separately beyond the E-Intelligent key respectively.
Again referring to Fig. 3 A, the course of work that digital sealing provided by the invention system whole comprises document is as follows:
(1) input desires to add a cover the original document 310 of digital sealing;
(2) 311 pairs of original documents 310 of document content extraction element are handled, and the original document key content is extracted;
(3) the document key content of above-mentioned document content extraction element 311 extractions is input in the digital signature generating apparatus 313, and the key 312 that utilizes system authentication center (CA) to sign and issue, and adopts public key algorithm that document content is done digital signature.This algorithm is the disclosed technology of prior art.
(4) digital signature that signature creating device 313 is generated is input in the watermark flush mounting 316.Watermark flush mounting 316 obtains the control information from seal access control apparatus 315, determine whether to visit original seal image 314, if can, so in watermark flush mounting 316, digital signature is embedded algorithm by digital watermarking be embedded in the original seal image 314, output comprises the digital sealing of digital signature information.Wherein, the bianry image digital watermarking algorithm that is adopted in the watermark flush mounting 316, its algorithm steps and ins and outs are open in 01132372.8 the Chinese patent application " a kind of digital anti-fake method " at application number, no longer describe here.
(5) tick lables that provides according to the user is attached to digital sealing in digital sealing adding apparatus 318 on the specified documents of original document, forms the document of adding a cover digital sealing, and output comprises the document 319 of the electronic form of digital sealing.
(6) according to practical application needs or customer requirements, print-out device 320 can print the paper copies of the document 319 of electronic form according to the output information of print control unit 322---comprise the document 321 of the paper-based form of digital sealing.
Can in multi-purpose computer, adopt software module to constitute, watermark flush mounting to those skilled in the art, also can adopt hardware to form.Fig. 3 B has provided the hard-wired structured flowchart of watermark flush mounting 316 among Fig. 3 A.This hardware comprises central processing unit CPU 323, and storage unit FLASH 324, data peripheral interface units 326, and the embedding hardware module 327 of digital watermarking.Receive original seal image 314 and the watermark information (being digital signature) that will embed by communication interface 325 (as USB, serial ports, parallel port etc.) commonly used; The seal image that comprises digital signature after will handling then sends it back computing machine or miscellaneous equipment by communication interface 325.
Fig. 4 A is the synoptic diagram of the authenticate device of the true and false of differentiating the electronic document comprise digital sealing and legitimacy.This authenticate device comprises: seal image extraction element 412, document content extraction element 411, watermark information extraction element 413 and digital signature authentication device 415.The course of work of this device is as follows:
(1) input contains the electronic document 410 of digital sealing;
(2) in seal image extraction element 412, the electronic document of input is handled, extract the seal image that comprises watermark (digital signature);
(3) in document content extraction element 411, the electronic document of input is handled, extract the document content that is subjected to legitimacy protection;
(4) in watermark information extraction element 413, the seal image of importing is carried out watermark information (digital signature information) extract, and export the digital signature information that extracts.Wherein, what adopted in the watermark information extraction element 413 is that the technology of bianry image digital watermarking algorithm is open in 01132372.8 the Chinese patent at application number, no longer describes here.
(5) key 414 signed and issued of digital signature authentication device 415 CA of receiving system authentication center, the digital signature information of in watermark information extraction element 413, extracting, the legal document content that in document content extraction element 411, extracts, carry out the checking of digital signature then, and the output result;
Certainly, seal image extraction element 412, document content extraction element 411, digital watermark information extraction element 413 and digital signature authentication device 415 constitute an electronic document demo plant 401, it can be integrated in the device, adopt this independent device, the user can provide the checking result behind the paper document 410 and key 414 of the checking of input desire.And it also both can be realized by software coding, also can adopt independent hardware unit or soft-hardware mix device to realize.
In addition, watermark information extraction element 413 can adopt software module to constitute in multi-purpose computer, also can adopt hardware to form.Fig. 4 B has provided the structural representation of the hardware implementation method of watermark extraction apparatus 413 among Fig. 4 A.This hardware comprises CPU (central processing unit) (CPU) 420, storage unit (FLASH) 421, data peripheral interface units 423, and the extraction hardware module 424 of digital watermarking.By the seal image that comprise watermark of communication interface 422 (as USB, serial ports, parallel port etc.) reception commonly used from seal image extraction element 412; Watermark information (digital signature) after will extracting then sends it back computing machine or miscellaneous equipment by communication interface 422.
Fig. 5 is the block scheme of authenticate device of the paper document that comprises digital sealing of digital sealing of the present invention system, and this device comprises: the automatic identification of image collecting device 511, image processing apparatus 512, Word message and manual input device/module 513, document content extraction element 515, seal image extract 514, watermark information extraction element (module) 413 and digital signature authentication device 415.Its verification step is:
(1) input contains the paper document 510 of digital sealing;
(2) image collecting device 511 utilizes image recording device (as video camera, scanner etc.) that paper document 510 is scanned in computing machine or other electronic equipment by general digital picture format (as JPEG, BMP etc.);
(3) the image scanning version of the paper document of 512 pairs of inputs of image processing module is carried out basic image pre-service, comprise denoising, rotation, change of scale, image recovery etc., and be partitioned into sub image section that comprises digital sealing and the sub image section that comprises Word message;
(4) the automatic typing of Word message and manual input device/module 513 receive the subimage that comprises Word message that image processing module 512 produces, be optical character identification OCR (Optical Character Recognition) and handle, automatically the Word message in the recognition image.For mistake, also can adopt the mode of manual typing that Word message is input in computing machine or the electronic equipment;
(5) seal image extraction module 514 receives the subimage that comprises digital sealing that image processing module 512 generates, and it is done Flame Image Process such as further images match, Threshold Segmentation, output and the equirotal digital sealing image to be detected of original seal image;
(6) content discerned in the automatic typing of document content extraction element/module 515 reception Word messages and the literal that manual input device/module 513 transmits, and to its further extraction of doing information, obtain being subjected to the document content information of legitimacy protection;
(7) in watermark information extraction element 516, the seal image of importing is carried out watermark information (digital signature information) extract, and export the digital signature information that extracts.Wherein, what adopted in this device 516 is that the technology of bianry image digital watermarking extraction algorithm is open in 01132372.8 the Chinese patent at application number, no longer describes here.This device and watermark information extraction element 413 shown in Figure 4 can be same modules.
(8) key 517 signed and issued of digital signature authentication device 518 CA of receiving system authentication center, the digital signature information of extracting in 516, the legal document content that extracts in 515 carry out the checking of digital signature then, and the output result;
Wherein, the automatic identification of image collecting device 511, image processing apparatus/module 512, Word message and manual input device/module 513, seal image extraction element 514, document content extraction element 515, digital watermark information extraction element 516 and digital signature authentication device 517 constitute a paper document demo plant 501, it also can be integrated a device 5, the user uses this isolated system, paper document 510 and key 517 in the checking of input desire can provide the checking result.
Fig. 6 represents that the present invention comprises the digital sealing system of digital sealing generation, transmission and authentication function, and this system comprises E-Intelligent key 301, adds a cover digital sealing system 300 on document, document transmission system 601, electronic document demo plant 401, paper document demo plant 501 and checking device displaying result 623.
From top description as can be known, digital sealing device 300 comprises document content extraction element 311, digital signature module 313, watermark flush mounting 316, according to tick lables to original document additional character seal module 318 and printout module 320 and printing control model 322, also can be an integrating device.Electronic document demo plant 401 comprises seal image extraction element 412, document content extraction element 411, digital watermark information extraction element 413 and digital signature authentication device 415 and constitutes.Paper document demo plant 501 comprises automatic identification and manual input device/module 513, seal image extraction element 514, document content extraction element 515, digital watermark information extraction element 516 and the digital signature authentication device 517 of image collecting device 511, image processing apparatus/module 512, Word message.
Like this, it is as follows with the course of work that authenticates to comprise generation, the transmission of the electronics of digital sealing or paper document:
(1) input original document 310;
(2) sealing system 300 of digital sealing receives the information of original document 310 inputs, and according to information in the E-Intelligent key 301 and control function, operation determines whether to affix one's seal.If of course, system 300 exports the electronics or the paper document of adding a cover digital sealing so;
(3) electronic document information that receives of the sealing system 300 of digital sealing or paper document information are by document transmitting device 601 input electronic document demo plant 401 or paper document verification systems 501.Concrete, electronic document information arrives node 618 by the transmission node 614 of document transmitting device 601 through digital transmission (device) 616 (as Network Transmission).In addition, the information of paper document arrives node 619 by transmission node 615 through physical transfer (device) 617 (as surface mail, directly deliver etc.).Transmission course also can be mixed type (as a first digital transmission, in physical transfer, and then digital transmission etc.).
(4) from the electronic document that comprises digital sealing of node 618, be imported into the legitimate verification that carries out document in the electronic document demo plant 401.The paper document that comprises digital sealing from node 619 is imported into the legitimate verification that carries out document in the paper document verification system 501.Checking result output also shows in checking device displaying result 623, can determine the true and false of digital watermarking according to this result.
By top description, can find that extremely effect is as follows for the technical essential of digital sealing provided by the invention system:
1: having adopted the digital sealing technology, is that document is more practical
Digital sealing has the electronic document of discriminating and the paper document true and false and anti-tamper, anti-counterfeiting function.A digital sealing comprises:
(1) digital picture that can explicit existence on document or corresponding papery output copy.This image is explicit being present in electronic document or the paper document, and can be discerned by human eye and image acquisition component;
(2) be embedded in digital signature or other secure authenticated information in the image.Digital signature is the digital signature that adopts public key algorithm that document content is done.
Digital sealing both can be the digital picture that comprises digital signature information in the electronic document, also can be the papery output copy that comprises the digital picture of digital signature information.
2: the method and apparatus of on document, adding a cover digital sealing
Document comprises two notions, it had both represented to be present in the electronic document (as MS-WORD, WPS, EMAIL, html web page etc.) in computing machine or the electronic equipment, represented that also this electronic document process print out equipment (or printing equipment) outputs to the paper copies on the paper.
Add a cover digital sealing on document, its step comprises a lower part:
At first on document, add a cover digital sealing, need to determine the input parameter of system.The input parameter that needs comprises:
(1) is used to generate the original seal image (digital form) of digital sealing;
(2) be used to store the electronic storage device of original seal image, as hard disc of computer, USB dish, IC-card etc.;
(3) be used to control the device that original seal image is visited and digital sealing generates, definite who or what equipment of this device can be visited original seal image, and whether can start the digital sealing generator program.Control information derives from sealer's password, and biological characteristic (as fingerprint, iris, face picture etc.) or other are connected in the hardware device (as EKEY, IC-card, Dongle etc.) of this device.
(4) original electronic document;
(5) be used to generate the key of the digital signature of original electronic document, this key is the private key (Private Key) that adopts standard P KI system to sign and issue by system authentication center CA (Certificated Agent).
Secondly, top input parameter is input in the digital watermarking flush mounting by data transmission channel, and generates the digital sealing image of document.The digital sealing image has comprised the digital signature information of document, is output in the module of affixing one's seal through this device.
At last, the module of affixing one's seal is attached to the assigned address of document with the digital sealing image, generates the electronic document that digital sealing has been added a cover in also output.This electronic document can pass through printout (or printing) equipment, produces corresponding paper copies.
3: the true and false authentication method and the device of document
Discriminating comprises the document true and false authentication of digital sealing, and its device comprises: equipment, digital signature authentication equipment and output device are as a result extracted in the extraction equipment of document input equipment, document content and digital sealing image, digital watermarking.The input parameter that device needs comprises: original input document (electronics and papery), the sealer who signs and issues by CA or the PKI of unit, and the basic step of discrimination method is so:
(1) document input: for paper copies, then paper copies is carried out image acquisition, and the image of gathering is input in the authentication equipment at needs;
(2) the input document is carried out contents extraction and seal image extraction.
(3) in digital watermark detecting device, seal image is carried out watermark detection and extraction.
(4) document content and watermark are input in the digital signature authentication equipment, carry out the checking of digital signature, and the result is exported.
Claims (5)
1, a kind of digital sealing system is characterized in that it comprises:
The document extraction element that the key content of original document is extracted;
The key of receiving system authentication center adopts public key algorithm the key content of the original document of document extraction element to be carried out the digital signature generating apparatus of digital signature;
Adopt the bianry image digital watermarking algorithm to generate the digital sealing generating apparatus of digital sealing;
The digital signature of digital signature generating apparatus is embedded into watermark flush mounting in the digital sealing that above-mentioned digital sealing generating apparatus produces; And
The digital sealing attachment device that the above-mentioned digital sealing that has digital signature is added the assigned address of original document.
2, digital sealing as claimed in claim 1 system is characterized in that it also comprises an authenticate device, and this authenticate device comprises:
The seal image extraction element that the seal image of the document that comprises digital sealing is extracted;
The document content extraction element that the document content of the document that comprises digital sealing is extracted;
With the binary image watermarking algorithm seal image of seal image extraction element is carried out the watermark information extraction element that watermark information (digital signature information) extracts; And
The key that receiving system authentication center signs and issues, the demo plant of verifying according to the document information of the watermark information of above-mentioned watermark information extraction element and above-mentioned document content extraction element.
3, the digital sealing system that states as claim 2 is characterized in that, described authenticate device also comprises the document transmitting device of an electronics or paper document information.
4, digital sealing as claimed in claim 2 system, it is characterized in that, it also comprises the automatic identification and the manual input device of an image collecting device, image collecting device, image information, described image collecting device can carry out image acquisition to the paper document that comprises digital sealing, then the information that collects is input to the automatic identification and the manual input device of described image processing apparatus and image information.
5, digital sealing as claimed in claim 4 system is characterized in that it comprises that also one can print electronic document the print-out device that becomes paper document.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109857 CN1635533A (en) | 2003-12-30 | 2003-12-30 | Digital stamp system |
| PCT/CN2004/001526 WO2005064524A1 (en) | 2003-12-30 | 2004-12-27 | Digital seal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109857 CN1635533A (en) | 2003-12-30 | 2003-12-30 | Digital stamp system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1635533A true CN1635533A (en) | 2005-07-06 |
Family
ID=34716078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310109857 Pending CN1635533A (en) | 2003-12-30 | 2003-12-30 | Digital stamp system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1635533A (en) |
| WO (1) | WO2005064524A1 (en) |
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