CN113784011A - Anti-counterfeiting method for official document flow seal picture - Google Patents
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- 238000012795 verification Methods 0.000 claims abstract description 21
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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
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32267—Methods relating to embedding, encoding, decoding, detection or retrieval operations combined with processing of the image
- H04N1/32272—Encryption or ciphering
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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
- H04N1/32352—Controlling detectability or arrangements to facilitate detection or retrieval of the embedded information, e.g. using markers
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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
- H04N1/44—Secrecy systems
- H04N1/4406—Restricting access, e.g. according to user identity
- H04N1/4413—Restricting access, e.g. according to user identity involving the use of passwords, ID codes or the like, e.g. PIN
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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- Editing Of Facsimile Originals (AREA)
Abstract
The invention relates to the technical field of electronic official document encryption and anti-counterfeiting, and particularly discloses an anti-counterfeiting method of an official document flow seal picture, which comprises an encryption flow and a verification flow and has higher security, wherein the anti-counterfeiting method of the official document flow seal picture comprises the encryption flow and the verification flow, and the encryption flow comprises the acquisition of the seal picture and ID information; generating an encryption string; generating position information; writing the encryption string and the position information into the seal picture to form an encrypted seal picture; adding the encrypted stamp picture into a workflow; the verification process comprises the steps of obtaining a seal picture to be verified and a document process ID; and inquiring the ID information and the position information, respectively inquiring the corresponding position encryption string and the ID encryption string according to the ID information and the position information, and comparing.
Description
Technical Field
The invention relates to the technical field of electronic official document encryption and anti-counterfeiting, in particular to an anti-counterfeiting method for official document flow seal pictures.
Background
OA paperless office is a new form of office at present, and has important significance for improving office efficiency, reducing paper consumption and lowering office cost. In OA office application of enterprises and public institutions, particularly in OA office application of government affairs, the first problem is to ensure the security of documents, and avoid the problems that seal pictures in the official document flow are transferred to other documents, namely, the official document seal pictures are embezzled, and the like, so as to ensure that the official document seal pictures are added by effective users in the official document transfer process, and further ensure the security and the effectiveness of the seal pictures in the official documents.
The traditional official document encryption mainly comprises digital certificate encryption and picture watermarking modes, the encryption cost of the former encryption mode is high, and the picture encryption is difficult to realize; although the latter encryption mode can encrypt the picture, the picture is corrected more in the encryption process, the original style of the seal picture is changed, and after the seal picture is encrypted by adopting the picture watermarking mode, the watermark on the seal picture can still be removed by means of related software, such as Photoshop and the like, the purpose of seal encryption is still difficult to achieve, and the security of the use of the official seal picture is insufficient.
Disclosure of Invention
Therefore, it is necessary to provide an anti-counterfeiting method for a seal picture in a document process, which includes an encryption process and a verification process, for solving the technical problem of insufficient security of the seal picture.
An anti-counterfeiting method for a seal picture in a document process comprises an encryption process and a verification process, wherein the encryption process comprises the following steps:
step S101: the workflow acquires a stamp picture and ID information;
step S102: performing MD5 encryption processing on the ID information to generate an encryption string;
step S103: generating position information of random pixel points according to the size of the seal;
step S104: grouping the encryption strings in the step S102 to form a plurality of RGB value groups, and writing the RGB value groups and the position information of the pixel points into the seal picture to form an encrypted seal picture;
step S105: recording the ID information and the position information of the pixel points into the associated information of the workflow, and adding the encrypted seal picture into the workflow to finish the seal operation;
the checking process comprises the following steps:
step S201: the workflow acquires information such as a seal picture to be verified, a document flow ID and the like;
step S202: inquiring corresponding ID information and position information of the pixel points in the related information of the workflow according to the official document process ID;
step S203: inquiring the position encryption string of the seal picture to be verified according to the position information of the pixel points;
step S204: performing MD5 processing on the inquired ID information to generate an ID encryption string;
step S205: and comparing the position encryption string with the ID encryption string, if the position encryption string and the ID encryption string are consistent, determining that the seal is valid, and finishing verification operation.
In one embodiment, the ID information includes a stamp ID, a user ID, a time, and a process ID.
In one embodiment, the encrypted string is a 32-bit encrypted string or a 64-bit encrypted string.
In one embodiment, the set of RGB values includes four bytes, corresponding to the red, green, blue and transparency values of the image table, respectively.
The anti-counterfeiting method for the official document flow seal picture comprises an encryption flow and a verification flow, wherein in the encryption flow, MD5 encryption processing is carried out on ID information of the seal picture to form an encryption string with less digits and position information of random pixel points corresponding to the encryption string, then a corresponding RGB value group is generated according to the encryption string, and the RGB value group and the position information of the random pixel points are written into the seal picture to form the encrypted seal picture; the encrypted seal pictures are added into the workflow, so that the binding of the official document flow and the seal pictures is realized, namely, a user can only use the corresponding seal pictures in a specific official document and cannot be used in other official document flows of the same system by modifying the pictures and the like, and the seal safety of the user is ensured; on the basis of encrypting the seal picture, in the official document flow, a user can call the seal picture to be verified, the MD5 processing is carried out on the seal picture again, the position information and the ID information are respectively inquired, the corresponding position encryption string and the ID encryption string are obtained, and the position information and the ID information are compared to judge whether the called seal picture to be verified is consistent with the encrypted seal picture in the official document flow, namely whether the seal picture to be verified is effective, so that the verification of the seal picture is realized.
Drawings
FIG. 1 is a flow chart of an anti-counterfeiting method for a seal picture in a document flow according to an embodiment of the invention;
FIG. 2 is a diagram of an encryption code for an encryption process according to one embodiment of the present invention;
FIG. 3 is a check code diagram of a check flow according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Referring to fig. 1, the present invention provides an anti-counterfeiting method 10 for a seal picture in a document flow, the anti-counterfeiting method 10 for the seal picture in the document flow comprises an encryption flow 100 and a verification flow 200, the encryption flow 100 is used for encrypting the seal picture to be added into a designated document to obtain an encrypted seal picture, and adding the encrypted seal picture into a workflow so as to call a corresponding seal picture when the seal is needed; the verification process 200 is used for verifying the authenticity of the stamp picture in the official document process, so as to prevent the problems of picture stealing, picture mistake and the like.
The encryption process 100 includes the following steps:
step S101: and acquiring a seal picture and ID information by the workflow.
Specifically, before the official document flow is performed, a user often makes seal pictures required to be stamped in advance, and the seal pictures all contain uniquely determined identification IDs to represent the seal pictures. After the system receives a stamping request of a user, the official document flow calls an input stamp picture to be stamped and ID information of the stamp from the system, and puts the stamp picture and the ID information of the stamp into a workflow, wherein the ID information comprises encoding information such as a stamp ID, a user ID, time, a flow ID and the like, it needs to be noted that the time encoding information corresponds to encoding information at a time point when the encryption flow 100 starts, and after the encryption flow 100 is finished, the time encoding information is interpreted as encryption time encoding information of the stamp picture.
Step S102: the ID information is subjected to MD5 encryption processing to generate an encrypted string.
Specifically, the encrypted string of the specified number of bits is generated by concatenating the encoded information such as the stamp ID, the user ID, the time, and the flow ID in the form of a character string and performing MD5 processing on the character string. It should be noted that MD5 is treated as MD5 encryption method, MD5(Message-Digest Algorithm5) is also called Message-Digest Algorithm, which makes large-capacity information "compressed" into a secret format before signing a private key with digital signature software, and it can also be understood that a byte string of any length is converted into a large integer of a certain length, and MD5 adds a concept of security-band to MD4, which further improves the security of data. When the MD5 is used to encrypt the character string, the bit number of the generated encrypted string is 32 bits, that is, the encrypted result is 32 bits, and in the actual processing process, the character string may also be encrypted in combination by the MD5 to obtain encrypted strings with other bit numbers, such as a 64-bit encrypted string and an encrypted string with more bit numbers.
Step S103: and generating the position information of the random pixel points according to the size of the seal.
Specifically, after the 32-bit encryption string is generated, the system identifies the size of the seal picture, namely the length and width value of the seal picture, on the basis of calling the seal picture, and generates 8 groups of random position information, namely the positions of 8 pixel points, in the seal picture range according to the length and width value of the seal picture, so that 8 pixel points are compared and verified in the verification flow 200.
Step S104: and (4) grouping the encryption strings in the step (S102) to form a plurality of RGB value groups, and writing the RGB value groups and the position information of the pixel points into the seal picture to form the encrypted seal picture.
Specifically, every 4 bytes of the 32-bit encryption string generated in step S102 are divided into 8 RGB value groups, four bytes of each group respectively correspond to red, green, blue and transparency values of the image table, i.e., an R value, a G value, a B value and an alpha value of the image table, and then the position information of the 8 pixel points and the RGB value groups generated in step S103 are written into the stamp picture, so as to obtain the encrypted stamp picture. Referring to fig. 2, fig. 2 shows that JAVA is used to write the encrypted string and the position information of the designated random pixel point into the code information of the stamp picture, that is, the code information of the MD5 encrypted string is written into a stamp picture, including obtaining the stamp picture object and obtaining the length value and width value of the stamp picture; calculating the pixel pitch, specifically obtaining the pixel pitch length by a predetermined formula, such as (width-minx)/5, namely dividing the length value of the stamp picture by 5, and obtaining the pixel pitch width by (height-miny)/3, namely dividing the width value of the stamp picture by 3; circularly calculating the positions of pixel points, assigning values to the pixel points, namely acquiring RGB values of the seal picture, and writing the positions and the RGB values of random pixel points into the seal picture to obtain a png-format new seal picture file, namely an encrypted seal picture file; and saving the picture. It should be noted that, in this embodiment, only a specific divisor, such as 3 and 5, is used to calculate the length value and the width value of the stamp picture and assign a value to the pixel pitch, and in the actual operation, other divisor values may be selected according to specific situations, such as the size of the picture, and are not described herein again.
Step S105: and recording the ID information and the position information of the pixel points into the associated information of the workflow, and adding the encrypted seal picture into the workflow to finish the seal operation.
Specifically, the position information and ID information of the random pixel points of the encrypted stamp picture, that is, the encoded information such as the stamp ID, the user ID, the encryption time, and the process ID, are recorded in the official document process of the system, so that the user can obtain the ID information of the stamp picture to be verified by querying the process ID of the official document process in the later verification process 200. And after the ID information of the encrypted seal picture is recorded, the system adds the encrypted seal picture into the official document flow and binds the encrypted seal picture with the specific official document content, namely finishing the seal operation of the official document.
It should be noted that, in step S105, the encrypted stamp picture is bound with the document content in the specific document flow, so that, in the document processing process, the specific encrypted stamp picture can only be used in the specific document flow, that is, only can be added to the specific document content, thereby preventing the stamp picture from being used by other document flows in the same system, and ensuring the security of the stamp picture.
In the process of circulation of the official document flow or when the user doubts the authenticity of the seal picture of the official document, the validity of the seal picture can be verified through the verification flow 200. Specifically, the verification process 200 includes the following steps:
step S201: and the workflow acquires information such as a seal picture to be verified, a document flow ID and the like.
Specifically, after receiving a request of a user for verifying a stamp picture, the system reads the stamp picture in the designated document and the document flow ID of the designated document, where the document flow ID originates from the encryption flow 100, and the flow ID code information generated when the encrypted stamp picture information is recorded uniquely corresponds to the code information of the document printed with the stamp picture.
Step S202: and inquiring corresponding ID information and position information of the pixel points in the associated information of the workflow according to the official document process ID.
Specifically, in the seal picture encryption process 100 of the official document process, the relevant information of the encrypted seal picture, that is, the encoding information such as the seal ID, the user ID, the encryption time, and the process ID, has been recorded and stored, so in the official document process, the seal ID, the user ID, the encryption time, the random pixel point position information, and the like of the official document seal picture relevant to the process ID can be searched through the process ID, for example, the process ID is compared with various process IDs in the system until the process ID encoding values are consistent, and the ID value and the random pixel point position information corresponding to the seal picture are obtained.
Step S203: and inquiring the position encryption string of the seal picture to be verified according to the position information of the pixel points.
Specifically, the encryption string in the stamp picture is further inquired through the inquired position information of the random pixel point, namely the encryption string containing the position information of the random pixel point in the inquiry system. It should be noted that, in the process of querying the encrypted string corresponding to the location information of the random pixel, the encoded information is still processed in an MD5 manner, and further, an MD5 verification manner is adopted. The reading and inquiring process is opposite to the process of encrypting the seal picture by MD5, and is characterized in that the R value, the G value, the B value and the alpha value of the corresponding pixel at the position of the random pixel point are connected to form a character string, and the character string is spliced into a 32-bit encryption string, so that the position encryption string is obtained. Referring to fig. 3, fig. 3 shows code information obtained by combining RGB values associated with position information of random pixel points in JAVA to form a 32-bit encryption string, that is, code information of an MD5 encryption string is read from a stamp picture, including reading a stamp picture object; acquiring a pixel object according to the transmitted pixel position, namely according to the length value and the width value of the stamp picture; reading pixels to obtain R, G, B and Alpha values of each random pixel point; and forming an MD5 string with 32 bits, and comparing the MD5 string with the previously stored data to judge whether the MD5 string is a valid picture.
Step S204: the ID information thus found is subjected to MD5 processing, thereby generating an ID encryption string.
Specifically, the inquired ID information, i.e., the seal ID, the user ID, the encryption time, the process ID, and other encoded information are connected in the form of a character string, and then the character string is MD5 processed to generate a 32-bit encryption string, which is formed by encoding the ID information of the seal picture and is recorded as an ID encryption string.
Step S205: and comparing the position encryption string with the ID encryption string, if the position encryption string and the ID encryption string are consistent, determining that the seal is valid, and finishing the verification operation.
Specifically, the MD5 processing is performed by using the position information of the random pixel and the RGB values of the related pixels, and the position encryption string obtained by splicing and the ID encryption string obtained by using the ID information of the stamp picture are encryption strings obtained by using different encoding information processing, and when the stamp picture to be verified is an effective stamp picture, that is, the encryption string information of the stamp picture to be verified should be completely identical to the encryption string information written in the encryption process 100 in the document process, in this case, both the position encryption string obtained by using the position information of the random pixel and the ID encryption string obtained by using the ID information of the stamp picture should be identical. In other words, when the stamp picture to be verified is an invalid stamp picture, the position encryption string obtained by performing operation by using the JAVA code shown in fig. 3 is difficult to match with the ID encryption string obtained by encoding the ID information of the stamp picture to be verified, that is, the position encryption string and the ID encryption string fail to match, thereby reporting the information that the stamp picture is invalid to the system.
The anti-counterfeiting method 10 for the official document flow seal picture comprises an encryption flow 100 and a verification flow 200, wherein in the encryption flow 100, MD5 encryption processing is carried out on ID information of the seal picture to form an encryption string with less digits and position information of random pixel points corresponding to the encryption string, then a corresponding RGB value group is generated according to the encryption string, and the RGB value group and the position information of the random pixel points are written into the seal picture to form the encrypted seal picture, compared with the original seal picture, the encrypted seal picture only changes the pixel points with less digits, so that the change is difficult to see by human eyes, and the interface effect is better; the encrypted seal pictures are added into the workflow, so that the binding of the official document flow and the seal pictures is realized, namely, a user can only use the corresponding seal pictures in a specific official document and cannot be used in other official document flows of the same system by modifying the pictures and the like, and the seal safety of the user is ensured; on the basis of encrypting the seal picture, in the official document flow, a user can call the seal picture to be verified, perform MD5 processing on the seal picture again, obtain the corresponding position encryption string and ID encryption string by respectively inquiring the position information and the ID information, and compare the position encryption string and the ID encryption string, so that whether the called seal picture to be verified is consistent with the encrypted seal picture in the official document flow or not can be judged, namely whether the seal picture to be verified is valid or not can be judged, and the verification of the seal picture can be realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. An anti-counterfeiting method (10) for a seal picture in a document process is characterized by comprising an encryption process (100) and a verification process (200), wherein the encryption process (100) comprises the following steps:
step S101: the workflow acquires a stamp picture and ID information;
step S102: performing MD5 encryption processing on the ID information to generate an encryption string;
step S103: generating position information of random pixel points according to the size of the seal;
step S104: grouping the encryption strings in the step S102 to form a plurality of RGB value groups, and writing the RGB value groups and the position information of the pixel points into the seal picture to form an encrypted seal picture;
step S105: recording the ID information and the position information of the pixel points into the associated information of the workflow, and adding the encrypted seal picture into the workflow to finish the seal operation;
the verification process (200) comprises the steps of:
step S201: the workflow acquires information such as a seal picture to be verified, a document flow ID and the like;
step S202: inquiring corresponding ID information and position information of the pixel points in the related information of the workflow according to the official document process ID;
step S203: inquiring the position encryption string of the seal picture to be verified according to the position information of the pixel points;
step S204: performing MD5 processing on the inquired ID information to generate an ID encryption string;
step S205: and comparing the position encryption string with the ID encryption string, if the position encryption string and the ID encryption string are consistent, determining that the seal is valid, and finishing verification operation.
2. The official document flow seal picture anti-counterfeiting method (10) according to claim 1, wherein the ID information comprises a seal ID, a user ID, time and a flow ID.
3. The anti-counterfeiting method (10) for official document process seal pictures according to claim 1, wherein the encryption string is a 32-bit encryption string or a 64-bit encryption string.
4. The anti-counterfeiting method (10) for official document process seal pictures according to claim 1, wherein the set of RGB values comprises four bytes corresponding to red, green, blue and transparency values of the image table, respectively.
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| CN115022681A (en) * | 2022-05-14 | 2022-09-06 | 中国广电广州网络股份有限公司 | Method for processing broadcast picture of broadcast television |
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