CN-122020728-A - Digital physical hybrid signature method, device, electronic equipment and storage medium

CN122020728ACN 122020728 ACN122020728 ACN 122020728ACN-122020728-A

Abstract

The application relates to a digital physical hybrid signature method, a device, electronic equipment and a storage medium, which relate to the technical field of information security and comprise the steps of calculating a document content hash value of an electronic document, acquiring random fiber distribution characteristics of a paper document bearing the electronic document, generating a paper fingerprint hash value according to the random fiber distribution characteristics, combining the document content hash value and the paper fingerprint hash value, carrying out digital signature processing on the combined hash value data by using a signature private key to generate a composite digital signature, associating the composite digital signature with the electronic document, and outputting the electronic document for printing, so that the printed paper document is the only physical entity bound with the composite digital signature. The application can obtain ideal balance in three key dimensions of low cost, high safety and convenient verification, and provides an anti-counterfeiting means which can bind specific paper and can independently and conveniently verify for common printing pieces.

Inventors

Yan Panjie
Xu Dinghang
TONG JINBO

Assignees

中金金融认证中心有限公司

Dates

Publication Date: 20260512
Application Date: 20251205

Claims (10)

1. A digital physical hybrid signature method, the method comprising: Acquiring an electronic document to be signed, and calculating a document content hash value of the electronic document; Acquiring random fiber distribution characteristics of a paper document bearing the electronic document, and generating a paper fingerprint hash value according to the random fiber distribution characteristics, wherein the paper fingerprint hash value is used for representing the uniqueness of the paper document; the document content hash value and the paper fingerprint hash value are subjected to data combination, and the combined hash value data is subjected to digital signature processing by using a signature private key to generate a composite digital signature; And associating the composite digital signature with the electronic document, and outputting the electronic document for printing, so that the printed paper document is the unique physical entity bound with the composite digital signature.
2. The method according to claim 1, wherein the obtaining the random fiber distribution characteristic of the paper document carrying the electronic document and generating the paper fingerprint hash value according to the random fiber distribution characteristic specifically comprises: collecting a plurality of continuous digital images in a preset area of the paper document through an image collecting device; judging whether the paper document is a three-dimensional paper document or not by analyzing the visual angle change of a plurality of frames of continuous digital images; And if the paper document is a three-dimensional paper document, acquiring random fiber distribution characteristics of the three-dimensional paper document, and generating a paper fingerprint hash value according to the random fiber distribution characteristics.
3. The method according to claim 2, wherein the obtaining the random fiber distribution characteristic of the three-dimensional paper document and generating the paper fingerprint hash value according to the random fiber distribution characteristic specifically comprises: Carrying out image preprocessing on the digital image, and extracting feature points of random fiber distribution from the preprocessed digital image by adopting a local feature algorithm insensitive to illumination and rotation to generate a digital feature vector, wherein the preprocessing comprises at least one of graying, contrast enhancement, distortion correction and noise reduction; And carrying out hash operation on the digital feature vector to obtain the paper fingerprint hash value.
4. A method according to claim 3, wherein the characteristic points comprise at least one of paper fiber interlacing points, and foreign points.
5. The method according to claim 2, wherein the method further comprises: acquiring a composite digital signature corresponding to the paper document, and decrypting the paper fingerprint hash value from the composite digital signature by using a public key; collecting a current digital feature vector of the predetermined area of the paper document, and calculating a field feature hash value of the current digital feature vector; verifying whether the field feature hash value is matched with the paper fingerprint hash value; If the Hamming distance between the field characteristic hash value and the paper fingerprint hash value is smaller than a preset Hamming distance threshold, the field characteristic hash value is matched with the paper fingerprint hash value, and the paper document is judged to be a physical original related to the composite digital signature; and if the Hamming distance between the field characteristic hash value and the paper fingerprint hash value is greater than or equal to the preset Hamming distance threshold, the field characteristic hash value is not matched with the paper fingerprint hash value, and the paper document is judged to be a counterfeit piece or a copy piece.
6. The method according to claim 5, wherein the obtaining the composite digital signature corresponding to the paper document comprises: scanning a two-dimensional code of the paper document to obtain index information associated with the composite digital signature; and acquiring the composite digital signature corresponding to the paper document based on the index information.
7. The method of claim 5, wherein the method further comprises: decrypting the document content hash value from the composite digital signature by using a public key; Identifying and calculating a current document content hash value of the paper document; verifying whether the current document content hash value is equal to the document content hash value; if the current document content hash value is equal to the document content hash value, judging that the document content of the paper document is not tampered; And if the current document content hash value is not equal to the document content hash value, judging that the document content of the paper document is tampered.
8. A digital physical hybrid signature apparatus, comprising: The electronic document signing device comprises an acquisition module, a signing module and a signing module, wherein the acquisition module is used for acquiring an electronic document to be signed and calculating a document content hash value of the electronic document; The generation module is used for acquiring random fiber distribution characteristics of a paper document bearing the electronic document and generating a paper fingerprint hash value according to the random fiber distribution characteristics, wherein the paper fingerprint hash value is used for representing the uniqueness of the paper document; the processing module is used for carrying out data combination on the document content hash value and the paper fingerprint hash value, and carrying out digital signature processing on the combined hash value data by using a signature private key to generate a composite digital signature; And the association module is used for associating the composite digital signature with the electronic document and outputting the electronic document for printing so that the printed paper document is the unique physical entity bound with the composite digital signature.
9. An electronic device comprising a storage medium, a processor and a computer program stored on the storage medium and executable on the processor, characterized in that the processor implements the digital physical hybrid signature method of any one of claims 1 to 7 when the computer program is executed by the processor.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the digital physical hybrid signature method of any of claims 1 to 7.

Description

Digital physical hybrid signature method, device, electronic equipment and storage medium Technical Field The present application relates to the field of information security technologies, and in particular, to a digital physical hybrid signature method, a digital physical hybrid signature device, an electronic device, and a storage medium. Background With the rapid development of information technology, electronic documents have become a mainstream carrier for business activities and daily offices due to their easy storage, transmission and processing characteristics. However, in many critical areas, such as legal contracts, government wholesale, financial instruments, academic certificates, etc., paper documents still play an irreplaceable role due to their physical entity, intuitiveness, and long-developed legal effectiveness. How to ensure the authenticity, integrity and non-repudiation of these paper documents, and prevent counterfeiting, tampering and repudiation is a core problem to be solved in the information security field for a long time. In order to cope with the above challenges, various anti-counterfeiting technical schemes such as digital watermark and visual cryptography schemes, special anti-counterfeiting paper and printing schemes, pure digital signature verification schemes and the like have been developed in the industry. However, the existing anti-counterfeiting technical schemes have respective inherent defects, can not achieve ideal balance in three key dimensions of low cost, high safety and convenient verification, and particularly can not effectively solve the core problem of how to provide an anti-counterfeiting means which can bind specific paper and can independently and conveniently verify for common printing pieces. Therefore, a new technical solution is urgently needed in the market to overcome the limitations of the prior art. Disclosure of Invention In view of the above, the present application provides a digital-physical hybrid signature method, a device, an electronic apparatus, and a storage medium, which mainly aims to solve the technical problems that the existing anti-counterfeiting technical schemes have respective inherent defects, and the ideal balance cannot be obtained in three key dimensions of low cost, high security and convenient verification, and particularly how to provide an anti-counterfeiting means capable of binding specific paper and independently and conveniently verifying for common printed pieces cannot be effectively solved. According to a first aspect of the present application there is provided a digital physical hybrid signature method comprising: Acquiring an electronic document to be signed, and calculating a document content hash value of the electronic document; Acquiring random fiber distribution characteristics of a paper document bearing the electronic document, and generating a paper fingerprint hash value according to the random fiber distribution characteristics, wherein the paper fingerprint hash value is used for representing the uniqueness of the paper document; the document content hash value and the paper fingerprint hash value are subjected to data combination, and the combined hash value data is subjected to digital signature processing by using a signature private key to generate a composite digital signature; And associating the composite digital signature with the electronic document, and outputting the electronic document for printing, so that the printed paper document is the unique physical entity bound with the composite digital signature. According to a second aspect of the present application, there is provided a digital physical hybrid signature apparatus comprising: The electronic document signing device comprises an acquisition module, a signing module and a signing module, wherein the acquisition module is used for acquiring an electronic document to be signed and calculating a document content hash value of the electronic document; The generation module is used for acquiring random fiber distribution characteristics of a paper document bearing the electronic document and generating a paper fingerprint hash value according to the random fiber distribution characteristics, wherein the paper fingerprint hash value is used for representing the uniqueness of the paper document; the processing module is used for carrying out data combination on the document content hash value and the paper fingerprint hash value, and carrying out digital signature processing on the combined hash value data by using a signature private key to generate a composite digital signature; And the association module is used for associating the composite digital signature with the electronic document and outputting the electronic document for printing so that the printed paper document is the unique physical entity bound with the composite digital signature. According to a third aspect of the present application there is provided a non-transitory