WO2022095312A1 - 电子印章添加和验证方法及系统 - Google Patents

电子印章添加和验证方法及系统 Download PDF

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Publication number
WO2022095312A1
WO2022095312A1 PCT/CN2021/078815 CN2021078815W WO2022095312A1 WO 2022095312 A1 WO2022095312 A1 WO 2022095312A1 CN 2021078815 W CN2021078815 W CN 2021078815W WO 2022095312 A1 WO2022095312 A1 WO 2022095312A1
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Prior art keywords
seal
content
image
document
verified
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PCT/CN2021/078815
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English (en)
French (fr)
Inventor
何征宇
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语联网（武汉）信息技术有限公司
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Priority claimed from CN202011238099.0A external-priority patent/CN112307520B/zh
Application filed by 语联网（武汉）信息技术有限公司 filed Critical 语联网（武汉）信息技术有限公司
Publication of WO2022095312A1 publication Critical patent/WO2022095312A1/zh

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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
    • 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

Definitions

  • the present disclosure relates to the technical field of electronic seal anti-counterfeiting, and in particular, to a method and system for adding and verifying electronic seals.
  • Electronic seals are images of official seals. There are more and more occasions where electronic seals are used in the process of enterprise operation, and they are often used in corporate announcements and online information release.
  • the prior art directly adds electronic seals to documents. Because the electronic seal itself is easy to be copied and disseminated, and it is also easy to extract from the published documents by the method of screenshot and Phtoshop processing. Therefore, the electronic seal in the document is prone to unauthorized use, and it can be added to any other document at will, causing adverse effects on the enterprise.
  • the embodiments of the present disclosure provide a method for adding identification information of an electronic seal, a method for verifying it, and a related system, so as to solve the defect that unauthorized use of electronic seals is easy to occur in the prior art, and realize the prevention and discovery of unauthorized use of electronic seals. Use behavior.
  • An embodiment of the present disclosure provides a method for adding an electronic seal, including:
  • Partial character strings are intercepted from the abstract of the content of the target file and mixed into the frequency domain information of the pre-acquired seal image as watermark text to generate a seal image with frequency domain watermark text;
  • a stamp image with frequency domain watermark text is added to the target file content.
  • a partial character string is intercepted from the abstract of the content of the target file and mixed into the frequency domain information of the pre-acquired seal image as watermark text to generate a seal with frequency domain watermark text Image steps include:
  • the step of encoding the binary image includes:
  • the binary image is encoded based on a pseudorandom sequence.
  • the embodiment of the present disclosure also provides an electronic seal verification method based on the above-mentioned electronic seal adding method, including:
  • Extract the watermark text from the seal area and compare the watermark text extracted from the seal area with the watermark text obtained from the abstract of the content of the document to be verified;
  • the step of extracting watermark text from the seal area includes:
  • the frequency domain information of the seal image is removed from the biorthogonal wavelet transform result of the foreground part in the seal area, and then decoding is performed to obtain the watermark text in the seal area.
  • the step of determining whether the seal image added in the content of the document to be verified matches the content of the document to be verified according to the comparison result includes:
  • watermark text extracted from the seal area is consistent with the watermark text obtained from the abstract of the content of the document to be verified, it is known that the image of the seal added in the content of the document to be verified matches the content of the document to be verified;
  • the embodiment of the present disclosure also provides an electronic seal adding system, including:
  • Extraction module for converting the target file content into a picture sequence, and extracting the abstract of the target file content from the picture sequence based on the SHA256 algorithm
  • a generating module is used to extract a part of the character string from the abstract of the content of the target file and mix it into the frequency domain information of the pre-acquired seal image as watermark text to generate a seal image with frequency domain watermark text;
  • the adding module is used for adding the stamp image with frequency domain watermark text to the content of the target file.
  • Embodiments of the present disclosure also provide an electronic seal verification system, including:
  • the interception module is used to intercept the seal area from the picture sequence of the content of the document to be verified according to the position of the pre-added seal image in the content of the document to be verified;
  • a comparison module configured to extract watermark text from the seal area, and compare the watermark text extracted from the seal area with the watermark text obtained from the abstract of the content of the document to be verified;
  • a determination module configured to determine whether the seal image added in the content of the document to be verified matches the content of the document to be verified according to the comparison result.
  • Embodiments of the present disclosure also provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the electronic device described above when the processor executes the program. Steps for Stamp Addition and Verification Method.
  • Embodiments of the present disclosure also provide a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of any of the above-mentioned methods for adding and verifying an electronic seal.
  • the method and system for adding and verifying electronic seals provided by the embodiments of the present disclosure, by using the frequency domain information processing technology of images, the abstract of the target file content is mixed into the frequency domain information of the original seal image in the form of watermark text, so that the new generation
  • the watermark text in the seal image does not produce obvious visible marks to the naked eye in appearance, it is not easy to find the watermark, and it is not easy to visually see the watermark content; in addition, it can still be obtained after the seal image is compressed, partially cropped and partially modified.
  • FIG. 1 is a schematic flowchart of a method for adding an electronic seal provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic flowchart of generating a seal image with frequency-domain watermark text in a method for adding electronic seals provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a mixing process of frequency domain information of a seal image and watermark text in a method for adding an electronic seal provided by an embodiment of the present disclosure
  • FIG. 5 is a complete schematic flowchart of an electronic seal verification method provided by an embodiment of the present disclosure.
  • FIG. 6 is a schematic flowchart of watermark text extraction in an electronic seal verification method provided by an embodiment of the present disclosure
  • FIG. 7 is a schematic structural diagram of an electronic seal adding system provided by an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of an electronic seal verification system provided by an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.
  • a method for adding an electronic seal according to an embodiment of the present disclosure is described below with reference to FIG. 1.
  • the method includes: S101, converting the content of a target file into a picture sequence, and extracting an abstract of the content of the target file from the picture sequence based on the SHA256 algorithm;
  • the content of the target file is the content of the file that needs to be added with an electronic seal.
  • This embodiment does not limit the format of the target file content, and the general file content is in Word and PDF formats. Get the content of the target file uploaded by the user, and convert the content of the target file into an image sequence, such as PNG format.
  • the SHA256 algorithm is one of the SHA (Secure Hash Algorithm, Secure Hash Algorithm) series of algorithms, and the digest of the target file content extracted using the SHA256 algorithm is 256 bits.
  • the pre-acquired stamp image is the original stamp image that needs to be added to the content of the target file.
  • the generation process of the stamp image with frequency domain watermark text is shown in Figure 2.
  • the newly generated stamp image is added to the content of the target file according to the recipient's operation. During the adding process, ensure that the overlap between the content of the target file and the seal image is small, generally less than 1/8. At the same time, the newly generated seal image and the content of the target file are filed together for the record.
  • This embodiment adopts the frequency domain information processing technology of images, and mixes the abstract of the content of the target file into the frequency domain information of the original seal image in the form of watermark text, so that the watermark text in the newly generated seal image does not appear to the naked eye.
  • the complete frequency domain watermark information can still be obtained after the seal image is compressed, partially cropped and partially modified; due to the watermark text and file content
  • realize the one-to-one correspondence between the electronic seal and the file content check the original source of the electronic seal according to the watermark information in the seal image, and verify whether the electronic seal matches the current file content, preventing and discovering unauthorized use of electronic seals .
  • a part of the character string is intercepted from the abstract of the content of the target file and mixed into the frequency domain information of the pre-acquired seal image as the watermark text to generate a stamp with the frequency domain watermark text
  • the step of the image includes: performing biorthogonal wavelet transformation on the foreground part of the seal image to obtain frequency domain information of the seal image;
  • the background of the original seal image is generally transparent.
  • the resolution of the seal image cannot be too low.
  • the length and width can be set to 512 ⁇ 512 pixels, and the background part can be set to white.
  • the seal image is preferably obtained after actual scanning of the physical seal to avoid single color information in the seal area.
  • the length and width of the binary image are set to 176 ⁇ 36 pixels, and the actual size can be set as required. If the size of the binary image is too large, there will be no obvious difference in the effect, but it will increase the amount of calculation.
  • the mixing process of the frequency domain information of the seal image and the watermark text is shown in Figure 3.
  • the step of encoding the binary image in this embodiment includes: encoding the binary image based on a pseudo-random sequence.
  • the binary image with characters is directly mixed into the frequency domain information of the seal image, it is easy to be discovered and recognized after the frequency domain information of the seal image is extracted, and the distribution of the pure binary image information is too concentrated.
  • the binary image of the watermark text is encoded and scrambled by using a pseudo-random sequence. In this way, simply extracting the frequency domain information of the seal image cannot directly see the content of the watermark text, and the information distribution in the encoded binary image is more uniform, which is convenient for subsequent mixing with the frequency domain information of the seal image.
  • this embodiment provides an electronic seal verification method based on the above-mentioned electronic seal adding method embodiment, the method includes: S401 , according to the position of the pre-added seal image in the content of the document to be verified, from the to-be-verified document content The seal area is intercepted in the image sequence for verifying the content of the file;
  • the content of the file to be verified is the content of the file that needs to be verified whether the added seal image matches the content of the file.
  • a stamp image is pre-added to the content of the document to be verified. Extract the area containing the stamp image from the content of the document to be authenticated.
  • the watermark text is extracted from the foreground of the stamp area.
  • the extracted watermark text can be recognized manually, or the extracted watermark text can be recognized by an image processing method. Or when the watermark text cannot be recognized manually, it can be recognized by an image processing method. If the watermark text is manually recognized, input the recognized watermark text.
  • the watermark text extracted from the seal area is compared with the watermark text generated in advance according to the content of the document to be verified.
  • the comparison result is consistent, it means that the seal image added in the content of the document to be verified matches the content of the document to be verified, and it does not belong to the unauthorized use of the electronic seal. If the comparison results are inconsistent, it means that the seal image added in the content of the document to be verified does not match the content of the document to be verified, which is an unauthorized use of the electronic seal.
  • the complete flow of the electronic seal verification method is shown in Figure 5.
  • This embodiment adopts the frequency domain information processing technology of images, and mixes the abstract of the content of the target file into the frequency domain information of the original seal image in the form of watermark text, so that the watermark text in the newly generated seal image does not appear to the naked eye.
  • the complete frequency domain watermark information can still be obtained after the seal image is compressed, partially cropped and partially modified; due to the watermark text and file content
  • realize the one-to-one correspondence between the electronic seal and the file content check the original source of the electronic seal according to the watermark information in the seal image, and verify whether the electronic seal matches the current file content, preventing and discovering unauthorized use of electronic seals .
  • the step of extracting the watermark text from the seal area in this embodiment includes: performing biorthogonal wavelet transform on the foreground part of the pre-acquired seal image without the frequency domain watermark text, and obtaining the frequency domain information of the seal image; biorthogonal wavelet transform is performed on the foreground part in the seal area; frequency domain information of the seal image is removed from the biorthogonal wavelet transform result of the foreground part in the seal area Decoding is then performed to obtain the watermark text in the seal area.
  • the watermark text in the seal image is obtained, as shown in FIG. 6 .
  • Decoding the watermark text wherein the decoding process is a reverse process of the encoding process when adding the electronic seal, so that the decoded content is the watermark text that can be recognized.
  • the step of determining whether the seal image added in the content of the document to be verified matches the content of the document to be verified according to the comparison result in this embodiment includes: if the watermark extracted from the seal area is If the text is consistent with the watermark text obtained from the abstract of the content of the document to be verified, it is known that the seal image added in the content of the document to be verified matches the content of the document to be verified; if the watermark extracted from the seal area is If the text is inconsistent with the watermark text obtained from the abstract of the content of the document to be verified, it is known that the image of the seal added in the content of the document to be verified does not match the content of the document to be verified.
  • the comparison result is consistent, it means that the seal image added in the content of the document to be verified matches the content of the document to be verified, and it does not belong to the unauthorized use of the electronic seal. If the comparison results are inconsistent, it means that the seal image added in the content of the document to be verified does not match the content of the document to be verified, which is an unauthorized use of the electronic seal.
  • the system includes an extraction module 701, a generation module 702 and an addition module 703, wherein:
  • the extraction module 701 is used to convert the target file content into a picture sequence, and extract the abstract of the target file content from the picture sequence based on the SHA256 algorithm;
  • the content of the target file is the content of the file that needs to be added with an electronic seal.
  • This embodiment does not limit the format of the target file content, and the general file content is in Word and PDF formats.
  • the extraction module 701 obtains the content of the target file uploaded by the user, and converts the content of the target file into a picture sequence, such as PNG format.
  • the SHA256 algorithm is one of the SHA series of algorithms, and the digest of the target file content extracted using the SHA256 algorithm is 256 bits.
  • the generating module 702 is used for intercepting part of the character string from the abstract of the content of the target file and mixing it into the frequency domain information of the pre-acquired seal image as watermark text to generate a seal image with frequency domain watermark text;
  • the generating module 702 truncates a part from the extracted abstract as the watermark text, for example, truncates a substring with a length of 8 bits.
  • strings at different positions are intercepted from the abstract of the uploaded file contents as the watermark text. For example, if the content of the target file is uploaded by the user for the third time, the character string will be intercepted from the third character in the abstract of the content of the target file, which makes it difficult for pirates to determine the watermark content and improves the security of the electronic seal.
  • the pre-acquired stamp image is the original stamp image that needs to be added to the content of the target file.
  • the adding module 703 is configured to add the stamp image with the frequency domain watermark text to the content of the target file.
  • the adding module 703 adds the newly generated seal image to the content of the target file according to the recipient's operation after the seal image with the frequency domain watermark text is generated. During the adding process, ensure that the overlap between the content of the target file and the seal image is small, generally less than 1/8. At the same time, the newly generated seal image and the content of the target file are filed together for the record.
  • This embodiment adopts the frequency domain information processing technology of images, and mixes the abstract of the content of the target file into the frequency domain information of the original seal image in the form of watermark text, so that the watermark text in the newly generated seal image does not appear to the naked eye.
  • the complete frequency domain watermark information can still be obtained after the seal image is compressed, partially cropped and partially modified; due to the watermark text and file content Relevant, realize the one-to-one correspondence between the electronic seal and the file content, check the original source of the electronic seal according to the watermark information in the seal image, and verify whether the electronic seal matches the current file content, preventing and discovering unauthorized use of the electronic seal. .
  • the system includes an intercepting module 801, a comparing module 802 and a determining module 803, wherein:
  • the interception module 801 is configured to intercept the seal area from the picture sequence of the content of the document to be verified according to the position of the pre-added seal image in the content of the document to be verified;
  • the content of the file to be verified is the content of the file that needs to be verified whether the added seal image matches the content of the file.
  • a stamp image is pre-added to the content of the document to be verified.
  • the intercepting module 801 intercepts the area containing the seal image from the content of the document to be verified.
  • the comparison module 802 is configured to extract the watermark text from the seal area, and compare the watermark text extracted from the seal area with the watermark text obtained from the abstract of the content of the document to be verified;
  • the watermark text is extracted from the foreground of the stamp area.
  • the extracted watermark text can be recognized manually, or the extracted watermark text can be recognized by an image processing method. Or when the watermark text cannot be recognized manually, it can be recognized by an image processing method. If the watermark text is manually recognized, input the recognized watermark text.
  • the comparison module 802 compares the watermark text extracted from the seal area with the watermark text generated in advance according to the content of the file to be verified.
  • the determining module 803 is configured to determine, according to the comparison result, whether the stamp image added in the content of the document to be verified matches the content of the document to be verified.
  • the comparison result is consistent, it means that the seal image added in the content of the document to be verified matches the content of the document to be verified, which is not an unauthorized use of the electronic seal. If the comparison results are inconsistent, it means that the seal image added in the content of the document to be verified does not match the content of the document to be verified, which is an unauthorized use of the electronic seal.
  • This embodiment adopts the frequency domain information processing technology of images, and mixes the abstract of the content of the target file into the frequency domain information of the original seal image in the form of watermark text, so that the watermark text in the newly generated seal image does not appear to the naked eye.
  • the complete frequency domain watermark information can still be obtained after the seal image is compressed, partially cropped and partially modified; due to the watermark text and file content Relevant, realize the one-to-one correspondence between the electronic seal and the file content, check the original source of the electronic seal according to the watermark information in the seal image, and verify whether the electronic seal matches the current file content, preventing and discovering unauthorized use of the electronic seal. .
  • FIG. 9 illustrates a schematic diagram of the physical structure of an electronic device.
  • the electronic device may include: a processor (processor) 910, a communication interface (Communications Interface) 920, a memory (memory) 930 and a communication bus 940,
  • the processor 910 , the communication interface 920 , and the memory 930 communicate with each other through the communication bus 940 .
  • the processor 910 can call the logic instruction in the memory 930 to execute the electronic seal adding method, the method includes: converting the content of the target file into a sequence of pictures, and extracting the abstract of the content of the target file from the sequence of pictures based on the SHA256 algorithm; Partial character strings are intercepted from the abstract of the content of the target file and mixed into the pre-acquired frequency domain information of the seal image as watermark text to generate a stamp image with frequency domain watermark text; the seal image with frequency domain watermark text is mixed to the content of the target file.
  • the above-mentioned logic instructions in the memory 930 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.
  • the technical solutions of the present disclosure can be embodied in the form of software products in essence, or the parts that contribute to the prior art or the parts of the technical solutions.
  • the computer software products are stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present disclosure.
  • the aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .
  • an embodiment of the present disclosure also provides a computer program product
  • the computer program product includes a computer program stored on a non-transitory computer-readable storage medium
  • the computer program includes program instructions, when the program instructions When executed by a computer, the computer can execute the electronic seal adding method provided by the above method embodiments, the method includes: converting the content of the target file into a picture sequence, and extracting the content of the target file from the picture sequence based on the SHA256 algorithm. Abstract; intercepting part of the character string from the abstract of the target file content as watermark text and mixing it into the frequency domain information of the pre-acquired seal image to generate a seal image with frequency domain watermark text; A stamp image is added to the object file content.
  • the embodiments of the present disclosure further provide a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, is implemented to execute the methods for adding electronic seals provided by the foregoing embodiments,
  • the method includes: converting the content of a target file into a sequence of pictures, extracting a digest of the content of the target file from the sequence of pictures based on a SHA256 algorithm; intercepting a part of the character string from the digest of the content of the target file as a watermark and mixing it into a pre- In the acquired frequency domain information of the seal image, a seal image with frequency domain watermark text is generated; the seal image with frequency domain watermark text is added to the content of the target file.
  • each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware.
  • the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

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Abstract

一种电子印章添加和验证方法及系统，该方法包括：将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要（S101）；从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像（S102）；将带有频域水印文字的印章图像添加到所述目标文件内容中（S103）。该方法使得添加到文件内容中的电子印章可根据印章图像中的频域水印信息核查电子印章的原始来源，以及验证电子印章是否与当前的文件内容匹配，防止并发现电子印章的非授权使用行为。

Description

电子印章添加和验证方法及系统
相关申请的交叉引用
本申请要求于2020年11月9日提交的申请号为2020112380990，发明名称为“电子印章添加和验证方法及系统”的中国专利申请的优先权，其通过引用方式全部并入本文。
技术领域
本公开涉及电子印章防伪技术领域，尤其涉及一种电子印章添加和验证方法及系统。
背景技术
电子印章为公章的图像。在企业运营过程中使用电子印章的场合越来越多，常常在企业公告和网络信息发布时会用到。
现有技术直接将电子印章添加到文件中。由于电子印章本身很容易被复制传播，并且也很容易采用截图加Phtoshop处理的方法从已发布的文件中提取出来。因此，文件中的电子印章很容易发生非授权使用行为，可以将其随意添加到任何其他文件中，对企业造成不良影响。
因此，如何对电子印章的使用进行有效控制和鉴别，成为亟待解决的问题。
发明内容
(一)要解决的技术问题
本公开实施例提供一种电子印章识别信息的添加方法和验证方法以及相关的系统，用以解决现有技术中电子印章很容易发生非授权使用行为的缺陷，实现防止并发现电子印章的非授权使用行为。
(二)发明内容
本公开实施例提供一种电子印章添加方法，包括：
将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；
从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；
将带有频域水印文字的印章图像添加到所述目标文件内容中。
根据本公开一个实施例的电子印章添加方法，从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像的步骤包括：
将所述印章图像中的前景部分进行双正交小波变换，获取所述印章图像的频域信息；
根据所述水印文字生成包含所述水印文字的二值图像，并对所述二值图像进行编码；
将所述印章图像的频域信息和所述水印文字的二值图像编码后的信息进行混合；
对混合结果进行双正交小波逆向变换，生成带有频域水印文字的印章图像。
根据本公开一个实施例的电子印章添加方法，对所述二值图像进行编码的步骤包括:
基于伪随机序列对所述二值图像进行编码。
本公开实施例还提供一种基于上述电子印章添加方法的电子印章验证方法，包括：
根据待验证文件内容中预先添加的印章图像的位置，从所述待验证文件内容中截取印章区域；
从所述印章区域中提取水印文字，将所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字进行比较；
根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配。
根据本公开一个实施例的电子印章验证方法，从所述印章区域中提取水印文字的步骤包括：
对预先获取的不带有频域水印文字的印章图像的前景部分进行双正交小波变换，获取所述印章图像的频域信息；
对所述印章区域中的前景部分进行双正交小波变换；
从所述印章区域中前景部分的双正交小波变换结果中去除所述印章图像的频域信息后进行解码，获取所述印章区域中的水印文字。
根据本公开一个实施例的电子印章验证方法，根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配的步骤包括：
若从所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字一致，则获知所述待验证文件内容中添加的印章图像与所述待验证文件内容匹配；
若从所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字不一致，则获知所述待验证文件内容中添加的印章图像与所述待验证文件内容不匹配。
本公开实施例还提供一种电子印章添加系统，包括：
提取模块，用于将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；
生成模块，用于从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；
添加模块，用于将带有频域水印文字的印章图像添加到所述目标文件内容中。
本公开实施例还提供一种电子印章验证系统，包括：
截取模块，用于根据待验证文件内容中预先添加的印章图像的位置，从所述待验证文件内容的图片序列中截取印章区域；
比较模块，用于从所述印章区域中提取水印文字，将所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字进行比较；
确定模块，用于根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配。
本公开实施例还提供一种电子设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，所述处理器执行所述程序时实现如上述任一种所述电子印章添加和验证方法的步骤。
本公开实施例还提供一种非暂态计算机可读存储介质，其上存储有计算机程序，该计算机程序被处理器执行时实现如上述任一种所述电子印章 添加和验证方法的步骤。
(三)有益效果
本公开实施例提供的电子印章添加和验证方法及系统，通过采用图像的频域信息处理技术，将目标文件内容的摘要以水印文字的方式混合到原始印章图像的频域信息中，使得新生成的印章图像中的水印文字在外观上不产生肉眼明显可见痕迹，不容易发现有水印，也不容易直观看出水印内容；另外，在对印章图像进行压缩、局部裁剪和局部修改后仍然能够获取完整的频域水印信息；由于水印文字与文件内容相关，实现电子印章与文件内容的一一对应，可根据印章图像中的水印信息核查电子印章的原始来源，以及验证电子印章是否与当前的文件内容匹配，防止并发现电子印章的非授权使用行为。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本公开实施例提供的一种电子印章添加方法的流程示意图；
图2是本公开实施例提供的一种电子印章添加方法中生成带有频域水印文字的印章图像的流程示意图；
图3是本公开实施例提供的一种电子印章添加方法中印章图像的频域信息与水印文字的混合过程示意图；
图4是本公开实施例提供的一种电子印章验证方法的流程示意图；
图5是本公开实施例提供的一种电子印章验证方法的完整流程示意图；
图6是本公开实施例提供的一种电子印章验证方法中水印文字提取的流程示意图；
图7是本公开实施例提供的一种电子印章添加系统的结构示意图；
图8是本公开实施例提供的一种电子印章验证系统的结构示意图；
图9是本公开实施例提供的一种电子设备的结构示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
下面结合图1描述本公开实施例的电子印章添加方法，该方法包括：S101，将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；
其中，目标文件内容为需要添加电子印章的文件内容。本实施例对目标文件内容的格式不作限定，一般的文件内容为Word和PDF格式。获取用户上传的目标文件内容，将目标文件内容转换为图片序列，如PNG格式。
SHA256算法是SHA(Secure Hash Algorithm，安全散列算法)系列算法之一，使用SHA256算法提取的目标文件内容的摘要为256位。
S102，从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像从提取的摘要中截取部分作为水印文字，如截取8位长度的子字符串。本实施例中从256位摘要结果字符串中循环截取与系统中已有摘要子串不重复的8位子串。256位字符串的首个字符的位置定义为0，进行循环截取，即截取的位置序列可以是253、254、255、0、1、2、3和4这8个位置对应的字符。以下为截取的具体步骤：
1、从[0,7]这个位置区间截取一个长度为8的子串；
2、在系统中检查，是否和已有的重复，如果不重复则截取结束，直接使用该子串；如果重复则从[1,8]这个位置区间截取一个长度为8的子串3、返回第2个步骤进行检查，如果直至[255,6]后仍然找不到不重复的子串，则返回失败。
本实施例提高了电子印章的安全性。预先获取的印章图像为需要添加到目标文件内容中的原始印章图像。带有频域水印文字的印章图像的生成过程如图2所示。
S103，将带有频域水印文字的印章图像添加到所述目标文件内容中。
在带有频域水印文字的印章图像生成好后，根据领取者的操作将新生成的印章图像添加到目标文件内容中。添加过程中保证目标文件内容与印章图像的重叠部分较小，一般小于1/8。同时，将新生成的印章图像和目标文件内容一同归档备案。
本实施例采用图像的频域信息处理技术，将目标文件内容的摘要以水印文字的方式混合到原始印章图像的频域信息中，使得新生成的印章图像中的水印文字在外观上不产生肉眼明显可见痕迹，不容易发现有水印，也不容易直观看出水印内容；另外，在对印章图像进行压缩、局部裁剪和局部修改后仍然能够获取完整的频域水印信息；由于水印文字与文件内容相关，实现电子印章与文件内容的一一对应，可根据印章图像中的水印信息核查电子印章的原始来源，以及验证电子印章是否与当前的文件内容匹配，防止并发现电子印章的非授权使用行为。
在上述实施例的基础上，本实施例中从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像的步骤包括：将所述印章图像中的前景部分进行双正交小波变换，获取所述印章图像的频域信息；
根据所述水印文字生成包含所述水印文字的二值图像，并对所述二值图像进行编码；将所述印章图像的频域信息和所述水印文字的二值图像编码后的信息进行混合；对混合结果进行双正交小波逆向变换，生成带有频域水印文字的印章图像。
其中，原始印章图像的背景一般为透明的。为了保证印章图像具有足够的频域信息量，印章图像的分辨率不能过低，如可以设置长宽为512×512像素，背景部分设置为白色。印章图像优选通过物理印章实际扫描后获得，以避免印章区域颜色信息单一。
如设置二值图像的长宽为176×36像素，实际尺寸可以根据需要设定，二值图像的尺寸过大在效果上不会有明显差异，反而增加计算量。印章图像的频域信息与水印文字的混合过程如图3所示。
在上述实施例的基础上，本实施例中对所述二值图像进行编码的步骤包括:基于伪随机序列对所述二值图像进行编码。
具体地，如果直接将带有字符的二值图像混入印章图像的频域信息中， 在提取印章图像的频域信息后很容易被发觉和识别，且单纯二值图像信息分布过于集中。为避免上述情况，对水印文字的二值图像采用伪随机序列进行编码打乱处理。这样单纯提取印章图像的频域信息无法直接看到水印文字的内容，并且编码后二值图像中的信息分布更加均匀，便于后续与印章图像的频域信息进行混合。
如图4所示，本实施例提供一种基于上述电子印章添加方法实施例的电子印章验证方法，该方法包括：S401，根据待验证文件内容中预先添加的印章图像的位置，从所述待验证文件内容的图片序列中截取印章区域；
其中，待验证文件内容为需要验证添加的印章图像是否与文件内容匹配的文件内容。待验证文件内容中已预先添加有印章图像。从待验证文件内容中截取包含印章图像的区域。
S402，从所述印章区域中提取水印文字，将所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字进行比较；
提取印章区域中的前景，即印章实体部分，并将其余的背景部分进行透明化处理。从印章区域的前景中提取出水印文字。可以通过人工识别提取出的水印文字，也可以通过图像处理方法识别提取出的水印文字。或者在人工识别不出水印文字时，通过图像处理方法识别。若人工识别出水印文字，将识别出的水印文字进行输入。将从印章区域提取的水印文字与预先根据待验证文件内容生成的水印文字进行比较。
S403，根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配。
若比较结果为一致，则说明待验证文件内容中添加的印章图像与待验证文件内容匹配，不属于电子印章非授权使用行为。若比较结果不一致，则说明待验证文件内容中添加的印章图像与待验证文件内容不匹配，属于电子印章非授权使用行为。电子印章验证方法的完整流程如图5所示。
本实施例采用图像的频域信息处理技术，将目标文件内容的摘要以水印文字的方式混合到原始印章图像的频域信息中，使得新生成的印章图像中的水印文字在外观上不产生肉眼明显可见痕迹，不容易发现有水印，也不容易直观看出水印内容；另外，在对印章图像进行压缩、局部裁剪和局部修改后仍然能够获取完整的频域水印信息；由于水印文字与文件内容相 关，实现电子印章与文件内容的一一对应，可根据印章图像中的水印信息核查电子印章的原始来源，以及验证电子印章是否与当前的文件内容匹配，防止并发现电子印章的非授权使用行为。
在上述实施例的基础上，本实施例中从所述印章区域中提取水印文字的步骤包括：对预先获取的不带有频域水印文字的印章图像的前景部分进行双正交小波变换，获取所述印章图像的频域信息；对所述印章区域中的前景部分进行双正交小波变换；从所述印章区域中前景部分的双正交小波变换结果中去除所述印章图像的频域信息后进行解码，获取所述印章区域中的水印文字。
具体地，从印章区域中前景部分的双正交小波变换结果中去除印章图像的频域信息后，获取印章图像中的水印文字，如图6所示。对水印文字进行解码，其中解码处理是对添加电子印章时的编码处理的逆向过程，使得解码的内容是可以被识别的水印文字。
在上述实施例的基础上，本实施例中根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配的步骤包括：若从所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字一致，则获知所述待验证文件内容中添加的印章图像与所述待验证文件内容匹配；若从所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字不一致，则获知所述待验证文件内容中添加的印章图像与所述待验证文件内容不匹配。
具体地，若比较结果为一致，则说明待验证文件内容中添加的印章图像与待验证文件内容匹配，不属于电子印章非授权使用行为。若比较结果不一致，则说明待验证文件内容中添加的印章图像与待验证文件内容不匹配，属于电子印章非授权使用行为。
下面对本公开实施例提供的电子印章添加系统进行描述，下文描述的电子印章添加系统与上文描述的电子印章添加方法可相互对应参照。
如图7所示，该系统包括提取模块701、生成模块702和添加模块703，其中：
提取模块701用于将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；
其中，目标文件内容为需要添加电子印章的文件内容。本实施例对目标文件内容的格式不作限定，一般的文件内容为Word和PDF格式。提取模块701获取用户上传的目标文件内容，将目标文件内容转换为图片序列，如PNG格式。SHA256算法是SHA系列算法之一，使用SHA256算法提取的目标文件内容的摘要为256位。
生成模块702用于从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；
生成模块702从提取的摘要中截取部分作为水印文字，如截取8位长度的子字符串。根据用户上传的文件内容的先后顺序，从上传的文件内容的摘要中截取不同位置的字符串作为水印文字。例如，若目标文件内容为用户第3次上传的，则从目标文件内容的摘要中第3个字符开始截取字符串，从而使得盗用者很难确定水印内容，提高了电子印章的安全性。预先获取的印章图像为需要添加到目标文件内容中的原始印章图像。
添加模块703用于将带有频域水印文字的印章图像添加到所述目标文件内容中。
添加模块703在带有频域水印文字的印章图像生成好后，根据领取者的操作将新生成的印章图像添加到目标文件内容中。添加过程中保证目标文件内容与印章图像的重叠部分较小，一般小于1/8。同时，将新生成的印章图像和目标文件内容一同归档备案。
本实施例采用图像的频域信息处理技术，将目标文件内容的摘要以水印文字的方式混合到原始印章图像的频域信息中，使得新生成的印章图像中的水印文字在外观上不产生肉眼明显可见痕迹，不容易发现有水印，也不容易直观看出水印内容；另外，在对印章图像进行压缩、局部裁剪和局部修改后仍然能够获取完整的频域水印信息；由于水印文字与文件内容相关，实现电子印章与文件内容的一一对应，可根据印章图像中的水印信息核查电子印章的原始来源，以及验证电子印章是否与当前的文件内容匹配，防止并发现电子印章的非授权使用行为。
下面对本公开实施例提供的电子印章验证系统进行描述，下文描述的电子印章验证系统与上文描述的电子印章验证方法可相互对应参照。
如图8所示，该系统包括截取模块801、比较模块802和确定模块803，其中：
截取模块801用于根据待验证文件内容中预先添加的印章图像的位置，从所述待验证文件内容的图片序列中截取印章区域；
其中，待验证文件内容为需要验证添加的印章图像是否与文件内容匹配的文件内容。待验证文件内容中已预先添加有印章图像。截取模块801从待验证文件内容中截取包含印章图像的区域。
比较模块802用于从所述印章区域中提取水印文字，将所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字进行比较；
提取印章区域中的前景，即印章实体部分，并将其余的背景部分进行透明化处理。从印章区域的前景中提取出水印文字。可以通过人工识别提取出的水印文字，也可以通过图像处理方法识别提取出的水印文字。或者在人工识别不出水印文字时，通过图像处理方法识别。若人工识别出水印文字，将识别出的水印文字进行输入。比较模块802将从印章区域提取的水印文字与预先根据待验证文件内容生成的水印文字进行比较。
确定模块803用于根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配。
若比较结果为一致，则说明待验证文件内容中添加的印章图像与待验证文件内容匹配，不属于电子印章非授权使用行为。若比较结果不一致，则说明待验证文件内容中添加的印章图像与待验证文件内容不匹配，属于电子印章非授权使用行为。
本实施例采用图像的频域信息处理技术，将目标文件内容的摘要以水印文字的方式混合到原始印章图像的频域信息中，使得新生成的印章图像中的水印文字在外观上不产生肉眼明显可见痕迹，不容易发现有水印，也不容易直观看出水印内容；另外，在对印章图像进行压缩、局部裁剪和局部修改后仍然能够获取完整的频域水印信息；由于水印文字与文件内容相关，实现电子印章与文件内容的一一对应，可根据印章图像中的水印信息核查电子印章的原始来源，以及验证电子印章是否与当前的文件内容匹配，防止并发现电子印章的非授权使用行为。
图9示例了一种电子设备的实体结构示意图，如图9所示，该电子设备可以包括：处理器(processor)910、通信接口(Communications Interface)920、存储器(memory)930和通信总线940，其中，处理器910，通信接口920，存储器930通过通信总线940完成相互间的通信。处理器910可以调用存储器930中的逻辑指令，以执行电子印章添加方法，该方法包括：将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；将带有频域水印文字的印章图像添加到所述目标文件内容中。
此外，上述的存储器930中的逻辑指令可以通过软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本公开的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本公开各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
另一方面，本公开实施例还提供一种计算机程序产品，所述计算机程序产品包括存储在非暂态计算机可读存储介质上的计算机程序，所述计算机程序包括程序指令，当所述程序指令被计算机执行时，计算机能够执行上述各方法实施例所提供的电子印章添加方法，该方法包括：将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；将带有频域水印文字的印章图像添加到所述目标文件内容中。
又一方面，本公开实施例还提供一种非暂态计算机可读存储介质，其上存储有计算机程序，该计算机程序被处理器执行时实现以执行上述各实施例提供的电子印章添加方法，该方法包括：将目标文件内容转换为图片 序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；将带有频域水印文字的印章图像添加到所述目标文件内容中。
以上所描述的系统实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到各实施方式可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件。基于这样的理解，上述技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如ROM/RAM、磁碟、光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行各个实施例或者实施例的某些部分所述的方法。
最后应说明的是：以上实施例仅用以说明本公开的技术方案，而非对其限制；尽管参照前述实施例对本公开进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本公开各实施例技术方案的精神和范围。

Claims (10)

  1. 一种电子印章添加方法，其特征在于，包括：
    将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；
    从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；
    将带有频域水印文字的印章图像添加到所述目标文件内容中。
  2. 根据权利要求1所述的电子印章添加方法，其特征在于，从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像的步骤包括：
    将所述印章图像中的前景部分进行双正交小波变换，获取所述印章图像的频域信息；
    根据所述水印文字生成包含所述水印文字的二值图像，并对所述二值图像进行编码；
    将所述印章图像的频域信息和所述水印文字的二值图像编码后的信息进行混合；
    对混合结果进行双正交小波逆向变换，生成带有频域水印文字的印章图像。
  3. 根据权利要求2所述的电子印章添加方法，其特征在于，对所述二值图像进行编码的步骤包括:
    基于伪随机序列对所述二值图像进行编码。
  4. 基于权利要求1-3任一所述的电子印章添加方法的电子印章验证方法，其特征在于，包括：
    根据待验证文件内容中预先添加的印章图像的位置，从所述待验证文件内容中截取印章区域；
    从所述印章区域中提取水印文字，将所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字进行比较；
    根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配。
  5. 根据权利要求4所述的电子印章验证方法，其特征在于，从所述 印章区域中提取水印文字的步骤包括：
    对预先获取的不带有频域水印文字的印章图像的前景部分进行双正交小波变换，获取所述印章图像的频域信息；
    对所述印章区域中的前景部分进行双正交小波变换；
    从所述印章区域中前景部分的双正交小波变换结果中去除所述印章图像的频域信息后进行解码，获取所述印章区域中的水印文字。
  6. 根据权利要求4所述的电子印章验证方法，其特征在于，根据比较结果确定所述待验证文件内容中添加的印章图像与所述待验证文件内容是否匹配的步骤包括：
    若从所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字一致，则获知所述待验证文件内容中添加的印章图像与所述待验证文件内容匹配；
    若从所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字不一致，则获知所述待验证文件内容中添加的印章图像与所述待验证文件内容不匹配。
  7. 一种电子印章添加系统，其特征在于，包括：
    提取模块，用于将目标文件内容转换为图片序列，基于SHA256算法从所述图片序列中提取所述目标文件内容的摘要；
    生成模块，用于从所述目标文件内容的摘要中截取部分字符串作为水印文字混合到预先获取的印章图像的频域信息中，生成带有频域水印文字的印章图像；
    添加模块，用于将带有频域水印文字的印章图像添加到所述目标文件内容中。
  8. 一种电子印章验证系统，其特征在于，包括：
    截取模块，用于根据待验证文件内容中预先添加的印章图像的位置，从所述待验证文件内容的图片序列中截取印章区域；
    比较模块，用于从所述印章区域中提取水印文字，将所述印章区域中提取的水印文字与从所述待验证文件内容的摘要中获取的水印文字进行比较；
    确定模块，用于根据比较结果确定所述待验证文件内容中添加的印章 图像与所述待验证文件内容是否匹配。
  9. 一种电子设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，其特征在于，所述处理器执行所述程序时实现如权利要求1至3任一项所述电子印章添加方法或者权利要求4至6任一项所述电子印章验证方法的步骤。
  10. 一种非暂态计算机可读存储介质，其上存储有计算机程序，其特征在于，该计算机程序被处理器执行时实现如权利要求1至3任一项所述电子印章添加方法或者权利要求4至6任一项所述电子印章验证方法的步骤。
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