Method of manufacturing stamp having security and method of determining authenticity of seal

Abstract

A method for determining the authenticity of a seal executed in a seal authenticity determination device according to the present invention comprises the steps of: receiving a seal image by photographing a seal generated through an anti-counterfeiting seal that is severed through a gap to have different lengths according to a bit structure; generating a plurality of auxiliary circles based on the seal on the seal image and then dividing them to generate a plurality of sectors; and generating a rectangle using the auxiliary circles on the plurality of sectors and connecting each of the rectangles to restore the bit structure.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing an anti-counterfeiting seal and a method for determining the authenticity of a seal on a document generated thereby. More specifically, it relates to an anti-counterfeiting seal and a method for manufacturing the same, which enables automatic determination of whether the seal was directly affixed by the owner or if it has been forged or altered by inserting a halftone pattern into the seal. Background Technology

[0003] Seals have long been used as a means of authenticating documents and proving their legal validity. In particular, they are utilized for identity verification and authorization in various legal and commercial transactions, such as contracts, official documents, and financial transactions. Although they remain widely used due to their convenience and traditional reliability, issues regarding forgery, alteration, and fraudulent use continue to be raised.

[0004] The most common forms of seals are ordinary seals and official seals. Ordinary seals are used as substitutes for everyday signatures and have limited legal validity, whereas official seals are official stamps registered with government agencies and possess strong legal force. Official seals are used as an important means of verifying one's identity, particularly in significant legal acts such as real estate transactions, banking, and contract signing. However, there are several fundamental limitations to the use of official seals.

[0005] First, existing seals are made of various materials such as wood, metal, and plastic, and forged seals can be created relatively easily using sophisticated replication technology. This can lead to instances where a third party, rather than the owner of the seal, forges documents without authorization.

[0006] Second, if an official seal is lost or stolen, a malicious user can exploit it to impersonate the owner and carry out legal actions. For example, a real estate sales contract may be finalized with an official seal stamped without the owner's knowledge, which can lead to lawsuits and financial damage.

[0007] Third, when using an official seal, while some institutions require an identification card along with the seal, transactions are still frequently conducted using only the seal. This entails a structural problem where it is difficult to verify whether the seal was stamped by the individual themselves.

[0008] As such, while various seal authentication technologies have been introduced to address issues of forgery, alteration, and fraudulent use, existing methods have several limitations.

[0009] First, some seals employ a method of adding hidden patterns using ultraviolet (UV) fluorescent ink to prevent forgery. However, this is difficult to verify without fluorescent detection equipment, and there is a possibility that the ink may fade over time.

[0010] Second, with the advancement of digital technology, electronic seals utilizing electronic signatures and accredited certificates have been developed. However, electronic seals are fundamentally different from traditional physical seals, and since physical seals are still frequently required in legal and administrative procedures, they have not been able to serve as a complete alternative.

[0011] Third, while some high-end seals have introduced authentication methods using unique QR codes or barcodes, this has the disadvantage of requiring a separate scanner for the user and potentially compromising the aesthetic appeal of the seal. The problem to be solved

[0013] The present invention aims to provide an anti-counterfeiting seal and a method for manufacturing the same, which enables automatic determination of whether the seal was directly stamped by the owner or if it has been forged or altered by inserting a halftone pattern into the seal.

[0014] In addition, the present invention aims to provide an anti-counterfeiting seal and a method for manufacturing the same, which utilizes a halftone pattern to maximize security while maintaining the existing seal form.

[0015] In addition, the present invention aims to provide an anti-counterfeiting seal and a method for manufacturing the same, which enables safer use of the seal in important legal acts such as real estate contracts and financial transactions by preventing third parties from misappropriating the seal through the establishment of an authentication system using a halftone pattern, thereby verifying whether the seal was stamped directly by the user.

[0017] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0019] A method for determining the authenticity of a seal executed in a device for determining the authenticity of a seal to achieve such an objective includes the steps of: receiving a seal image by photographing a seal generated through an anti-counterfeiting seal that is severed through a gap to have different lengths according to a bit structure; generating a plurality of auxiliary circles based on the seal on the seal image and then dividing them to generate a plurality of sectors; and generating a rectangle using the auxiliary circles on the plurality of sectors, and connecting each of the rectangles to restore the bit structure.

[0020] In one embodiment, the method for determining the authenticity of a seal may further include a step of determining whether the type of seal is a standard circle or an ellipse, and a step of scaling the seal into a standard circle based on the determination result.

[0021] In one embodiment, the step of generating a plurality of auxiliary circles based on the seal and then dividing them to generate a plurality of sectors may include the step of generating a first auxiliary circle inside the seal and generating a second auxiliary circle outside the seal.

[0022] In one embodiment, the step of creating a plurality of auxiliary circles based on the seal and then dividing them to create a plurality of sectors may include the step of setting a reference diameter by connecting a point on the circumference of the second auxiliary circle from the center of the seal, and creating a plurality of sectors by dividing the circumference of the code insertion surface among the seal surfaces of the second auxiliary anti-counterfeiting seal by a specific angle using the reference diameter as the central axis, and the step of creating a radial trapezoid by connecting a vertex corresponding to the first virtual circle and a vertex corresponding to the second virtual circle and then dividing it, and then scaling it into a standard trapezoid.

[0023] In one embodiment, the step of generating squares using each of the auxiliary circles on the plurality of sectors and restoring the bit structure by connecting each of the squares may include the step of determining a start position and an end position using the length of the dash between the gaps and the step of determining the dash between the start position and the end position as a decoding target.

[0024] In one embodiment, the step of generating squares using each of the auxiliary circles on the plurality of sectors and restoring the bit structure by connecting each of the squares may include the step of determining whether the bit value is 0 or 1 using the length of the dash between the gaps and then combining them to derive a code value.

[0025] In addition, a method for manufacturing an anti-counterfeiting seal executed in an anti-counterfeiting seal manufacturing device for achieving such purpose includes: a step of determining a bit structure composed of a gap separating a dash of different lengths and a gap between the dashes; and a step of inserting the bit structure by etching the perimeter of the code insertion surface among the stamping surfaces of the anti-counterfeiting seal after adjusting the ratio of the dash and the gap according to the perimeter of the code insertion surface among the stamping surfaces of the anti-counterfeiting seal.

[0026] In one embodiment, the bit structure may be composed of dashes and gaps of different lengths formed by connecting a specific number of standard length dashes according to a control bit, a data length type bit, a data bit, and a checksum. Effects of the invention

[0028] According to the present invention as described above, by inserting a halftone pattern into a seal, there is an advantage in that it is possible to automatically determine whether the seal was stamped directly by the owner or if it was forged or altered.

[0029] In addition, according to the present invention, there is an advantage in that security can be maximized while maintaining the existing seal shape by utilizing a halftone pattern.

[0030] In addition, according to the present invention, by establishing an authentication system using a halftone pattern, it is possible to verify whether the seal was stamped directly by the user, thereby preventing a third party from misusing the seal. This offers the advantage of enabling safer seal usage in important legal activities, such as real estate contracts and financial transactions. Brief explanation of the drawing

[0032] FIG. 1 is a flowchart for an exemplary method of manufacturing an anti-counterfeiting seal according to the present invention. FIG. 2 is a flowchart illustrating an embodiment of a code decoding method in an anti-counterfeiting seal according to the present invention. FIGS. 3 and FIGS. 4 are illustrative diagrams for explaining a method for manufacturing an anti-counterfeiting seal according to the present invention. FIGS. 5 to 7 are exemplary diagrams for explaining a method for determining the authenticity of a seal on a document according to the present invention. Specific details for implementing the invention

[0033] The aforementioned objectives, signatures, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0035] FIG. 1 is a flowchart illustrating an embodiment of a method for manufacturing an anti-counterfeiting seal according to the present invention.

[0036] Referring to FIG. 1, the anti-counterfeiting seal manufacturing device determines a bit structure consisting of gaps separating dashes of different lengths and dashes (step S110). At this time, the code value may be composed of gaps separating dashes of different lengths and dashes according to a control bit, a data length type bit, a data bit, and a checksum.

[0037] Control bits are information indicating the start and end of a bit structure, data length type bits are information indicating the length of the data, checksums are information for checking for errors in the data, and data bits are information about the code value.

[0038] At this time, the basic dash can be implemented with a specific length, and the basic dash can be connected by a specific number of times to be implemented as a dash of the first length, a dash of the second length, and a dash of the third length. At this time, the dash of the first length consists of 1 dash, the dash of the second length consists of 2 dashes, and the dash of the third length consists of 3 dashes.

[0039] For example, the control bit can be implemented with a dash of a first length. That is, the start position can be indicated by a dash of a first length, and the end position can be indicated by the dash of a first length being repeated twice through a gap. The data bit can be implemented with a dash of a second length or a third length.

[0040] The dash of the second length and the dash of the third length can indicate a bit value of 0 or 1. That is, if the dash of the second length indicates a bit value of 0, the dash of the third length can indicate a bit value of 1, and if the dash of the second length indicates a bit value of 1, the dash of the third length can indicate 0.

[0041] The anti-counterfeiting seal manufacturing device adjusts the ratio of the dash and the gap according to the circumference of the code insertion surface among the stamping surfaces of the anti-counterfeiting seal, and then etches the circumference of the code insertion surface among the stamping surfaces of the anti-counterfeiting seal to insert the bit structure (step S120).

[0042] In one embodiment of step S120, the anti-counterfeiting seal manufacturing device may calculate the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal based on the radius or diameter of the anti-counterfeiting seal, proportionally adjust the lengths of the dashes and gaps to match the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal, and then etch the adjusted dashes and gaps along the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal.

[0044] FIG. 2 is a flowchart illustrating an embodiment of a code decoding method in an anti-counterfeiting seal according to the present invention.

[0045] Referring to FIG. 2, the seal authenticity determination device receives a seal image by photographing a seal generated through an anti-counterfeiting seal that is severed through a gap to have different lengths according to a bit structure (step S210).

[0046] Although not shown in FIG. 2, the seal authenticity determination device determines whether the type of seal is a standard circle or an ellipse. At this time, if the seal is an ellipse, it is scaled into a standard circle using multiple center points of the seal.

[0047] To this end, if the seal authenticity determination device is an ellipse, it searches for the center point of the ellipse's symmetry using the first axis and the second axis. In this case, the first axis is the long axis of the ellipse, which is a dash connecting the first center and the second center, and the second axis is the short axis of the ellipse, which is a dash passing through the center point and perpendicular to the first axis.

[0048] After that, the seal authenticity determination device calculates the distance between the first center and the second center using the radius of the first axis and the radius of the second axis, and calculates the first center and the second center based on the distance and the intersection point between the first axis and the second axis.

[0049] In one embodiment, the seal authenticity determination device can determine that the first center and the second center of the ellipse are on the x-axis because the ellipse is a horizontal ellipse when the first axis is in the x-axis direction.

[0050] In the above embodiment, the seal authenticity determination device calculates the distance between the first center and the second center using the radius of the first axis and the radius of the second axis, and can calculate the first center and the second center on the x-axis using the distance and the intersection point between the first axis and the second axis.

[0051] In another embodiment, the seal authenticity determination device can determine that the first center and the second center are on the y-axis because the ellipse is a vertical ellipse when the first axis is in the y-axis direction.

[0052] In the above embodiment, the seal authenticity determination device can calculate the distance between the first center and the second center using the radius of the first axis and the radius of the second axis, and calculate the first center and the second center on the y-axis using the distance and the intersection point between the first axis and the second axis.

[0053] As described above, the seal authenticity determination device scales to a standard circle by correcting the lengths of the first axis and the second axis so that they are equal when the lengths of the first axis and the second axis are different. At this time, each of the first axis and the second axis can be the x-axis or the y-axis.

[0054] In one embodiment, when the length of the x-axis is longer than the length of the y-axis, the seal authenticity determination device scales to a standard circle by multiplying the length of the x-axis by the length of the x-axis / the length of the b-axis so that the length of the x-axis is equal to the length of the y-axis.

[0055] In another embodiment, when the length of the y-axis is longer than the length of the x-axis, the seal authenticity determination device scales to a standard circle by multiplying the length of the y-axis by the length of the y-axis / the length of the x-axis so that the length of the x-axis is equal to the length of the y-axis.

[0056] Through the process described above, the length of the x-axis becomes equal to the length of the y-axis, and as a result, the ellipse is converted into a standard circle.

[0057] After that, the seal authenticity determination device generates a plurality of auxiliary circles based on the seal and then divides them to generate a plurality of sectors (step S220).

[0058] In one embodiment of step 220, the seal authenticity determination device may create a first auxiliary circle inside the standard circle and a second auxiliary circle outside the standard circle based on the standard circle.

[0059] The seal authenticity determination device generates a rectangle using a plurality of auxiliary circles on a sector (step S230).

[0060] In one embodiment of step S230, the seal authenticity determination device sets a reference diameter by connecting a point on the circumference of the second auxiliary circle from the center of the standard circle, and creates a plurality of fan shapes by dividing the circumference of the code insertion surface among the sealing surfaces of the second auxiliary anti-counterfeiting seal by a specific angle using the reference diameter as the central axis.

[0061] After that, the seal authenticity determination device creates a radial trapezoid by connecting the vertex corresponding to the first virtual circle and the vertex corresponding to the second virtual circle for each of the multiple sectors and then dividing them. At this time, the seal authenticity determination device can deform the radial trapezoid and scale it into a standard trapezoid.

[0062] The device for determining the authenticity of a seal decodes the bit structure using the break on the dash (step S240).

[0063] In one embodiment of step S240, the seal authenticity determination device analyzes the dashes and, if a break in the dashes exists, uses the length of the dashes between the gaps to determine the start position and the end position. Then, the seal authenticity determination device determines the dashes between the start position and the end position as the target for decoding.

[0064] For example, a seal authenticity determination device may determine that if the length of the dash between the gaps is a first length, the corresponding discontinuity is a starting position, and if the length of the dash between the gaps is a repeating first length, the corresponding discontinuity is a starting position.

[0065] After that, the seal authenticity determination device determines the dash between the start position and the end position as a decoding target, and determines whether the bit value is 0 or 1 using the length of the dash between the gaps for the dash of the decoding target, and then combines them to derive a code value.

[0067] FIGS. 3 and FIGS. 4 are illustrative diagrams for explaining a method for manufacturing an anti-counterfeiting seal according to the present invention.

[0068] Referring to FIGS. 3 and 4, the anti-counterfeiting seal manufacturing device determines a bit structure consisting of dashes of different lengths and gaps separating the dashes as in FIG. 3.

[0069] At this time, the code value may be composed of gaps separating dashes of different lengths and dashes according to the control bit (301), data length type bit (302), checksum (303), and data bit (304).

[0070] The control bit (301) is information indicating the start and end of the bit structure, the data length type bit (302) is information indicating the length of the data, the checksum (303) is information for checking for errors in the data, and the data bit (304) is information about the actual code value.

[0071] At this time, the basic dash can be implemented with a specific length, and the basic dash can be connected by a specific number of times to be implemented as a dash of the first length, a dash of the second length, and a dash of the third length. At this time, the dash of the first length consists of 1 dash, the dash of the second length consists of 2 dashes, and the dash of the third length consists of 3 dashes.

[0072] For example, the control bit (301) can be implemented with a dash of a first length. That is, the start position can be indicated by a dash of a first length, and the end position can be indicated by the dash of a first length being repeated twice through a gap. The data bit (304) can be implemented with a dash of a second length or a third length.

[0073] The dash of the second length and the dash of the third length can indicate a bit value of 0 or 1. That is, if the dash of the second length indicates a bit value of 0, the dash of the third length can indicate a bit value of 1, and if the dash of the second length indicates a bit value of 1, the dash of the third length can indicate 0.

[0074] After that, the anti-counterfeiting seal manufacturing device adjusts the ratio of the dash and the gap according to the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal, and then inserts a bit structure by mapping it to the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal as shown in FIG. 4.

[0075] To this end, the anti-counterfeiting seal manufacturing device can calculate the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal based on the radius or diameter of the anti-counterfeiting seal, proportionally adjust the lengths of the dashes and gaps to match the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal, and then etch the adjusted dashes and gaps along the circumference of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal.

[0077] FIGS. 5 to 7 are exemplary diagrams for explaining a method for determining the authenticity of a seal on a document according to the present invention.

[0078] Referring to FIGS. 5 and 6, the seal authenticity determination device receives a seal image generated through an anti-counterfeiting seal into which a code is inserted by severing it to have different lengths according to a bit structure.

[0079] At this time, although not shown in FIG. 5, the seal authenticity determination device determines whether the type of seal on the seal image is a standard circle or an ellipse. At this time, if the seal is an ellipse, it is scaled into a standard circle using a plurality of center points of the seal.

[0080] To this end, if the seal authenticity determination device is an ellipse, it searches for the center point of the ellipse's symmetry using the first axis and the second axis. In this case, the first axis is the long axis of the ellipse, which is a dash connecting the first center and the second center, and the second axis is the short axis of the ellipse, which is a dash passing through the center point and perpendicular to the first axis.

[0081] After that, the seal authenticity determination device calculates the distance between the first center and the second center using the radius of the first axis and the radius of the second axis, and calculates the first center and the second center based on the distance and the intersection point between the first axis and the second axis.

[0082] In one embodiment, the seal authenticity determination device can determine that the first center and the second center of the ellipse are on the x-axis because the ellipse is a horizontal ellipse when the first axis is in the x-axis direction.

[0083] In the above embodiment, the seal authenticity determination device calculates the distance between the first center and the second center using the radius of the first axis and the radius of the second axis, and can calculate the first center and the second center on the x-axis using the distance and the intersection point between the first axis and the second axis.

[0084] In another embodiment, the seal authenticity determination device can determine that the first center and the second center are on the y-axis because the ellipse is a vertical ellipse when the first axis is in the y-axis direction.

[0085] In the above embodiment, the seal authenticity determination device can calculate the distance between the first center and the second center using the radius of the first axis and the radius of the second axis, and calculate the first center and the second center on the y-axis using the distance and the intersection point between the first axis and the second axis.

[0086] As described above, the seal authenticity determination device scales to a standard circle by correcting the lengths of the first axis and the second axis so that they are equal when the lengths of the first axis and the second axis are different. At this time, each of the first axis and the second axis can be the x-axis or the y-axis.

[0087] In one embodiment, when the length of the x-axis is longer than the length of the y-axis, the seal authenticity determination device scales to a standard circle by multiplying the length of the x-axis by the length of the x-axis / the length of the b-axis so that the length of the x-axis is equal to the length of the y-axis.

[0088] In another embodiment, when the length of the y-axis is longer than the length of the x-axis, the seal authenticity determination device scales to a standard circle by multiplying the length of the y-axis by the length of the y-axis / the length of the x-axis so that the length of the x-axis is equal to the length of the y-axis.

[0089] Through the process described above, the length of the x-axis becomes equal to the length of the y-axis, and as a result, the ellipse is converted into a standard circle.

[0090] The seal authenticity determination device generates multiple auxiliary circles based on the seal, then divides them to generate multiple sectors.

[0091] As shown in reference number (a) of FIG. 5, the seal authenticity determination device can create a first auxiliary circle on the inside of the standard circle and a second auxiliary circle on the outside of the standard circle based on the standard circle.

[0092] After that, as shown in reference number (b) of Fig. 5, the seal authenticity determination device creates a rectangle using a plurality of auxiliary circles on a sector.

[0093] In one embodiment, the device for determining the authenticity of a seal sets a reference diameter by connecting a point on the circumference of a second auxiliary circle from the center of a standard circle, and creates a plurality of fan shapes by dividing the circumference of the code insertion surface among the sealing surfaces of the second auxiliary anti-counterfeiting seal by a specific angle using the reference diameter as the central axis.

[0094] After that, as shown in reference number (c) of FIG. 6, the seal authenticity determination device connects the vertex corresponding to the first virtual circle and the vertex corresponding to the second virtual circle for each of the multiple sectors, and then divides them to generate a radial trapezoid as shown in reference number (d) of FIG. 6. At this time, the seal authenticity determination device can deform the radial trapezoid and scale it into a standard trapezoid.

[0095] Then, the seal authenticity determination device decodes the bit structure using the break on the dash.

[0096] In one embodiment, the seal authenticity determination device analyzes the dashes and, if a break in the dashes exists, uses the length of the dashes between the gaps to determine the start position and the end position. Then, the seal authenticity determination device determines the dashes between the start position and the end position as the target for decoding.

[0097] For example, a seal authenticity determination device may determine that if the length of the dash between the gaps is a first length, the corresponding discontinuity is a starting position, and if the length of the dash between the gaps is a repeating first length, the corresponding discontinuity is a starting position.

[0098] After that, the seal authenticity determination device determines the dash between the start position and the end position as a decoding target, and determines whether the bit value is 0 or 1 using the length of the dash between the gaps for the dash of the decoding target, and then combines them to derive a code value.

[0100] Although the present invention has been described by the embodiments and drawings described above, the present invention is not limited to the above embodiments, and various modifications and variations are possible from this description by those skilled in the art to which the present invention pertains. Accordingly, the concept of the present invention should be understood only by the claims set forth below, and all equivalent or analogous variations thereof shall be considered to fall within the scope of the concept of the present invention.

Claims

Claim 1 A method for determining the authenticity of a seal executed in a device for determining the authenticity of a seal, comprising: a step of receiving a seal image by photographing a seal generated through an anti-counterfeiting seal that is severed through a gap to have different lengths according to a bit structure; a step of generating a plurality of auxiliary circles based on the seal on the seal image and then dividing them to generate a plurality of sectors; and a step of generating a rectangle using the auxiliary circles on the plurality of sectors and connecting each of the rectangles to restore the bit structure. Claim 2 A method for determining the authenticity of a seal according to claim 1, further comprising: a step of determining whether the type of seal is a standard circle or an ellipse; and a step of scaling the seal into a standard circle based on the determination result. Claim 3 A method for determining the authenticity of a seal according to claim 1, wherein the step of generating a plurality of auxiliary circles based on the seal and then dividing to generate a plurality of sectors includes the step of generating a first auxiliary circle inside the seal and generating a second auxiliary circle outside the seal. Claim 4 In claim 3, the step of generating a plurality of auxiliary circles based on the seal and then dividing them to generate a plurality of sectors comprises: a step of setting a reference diameter by connecting a point on the circumference of the second auxiliary circle from the center of the seal, and generating a plurality of sectors by dividing the circumference of the code insertion surface among the seal surfaces of the second auxiliary anti-counterfeiting seal by a specific angle using the reference diameter as the central axis; and a step of generating a radial trapezoid by connecting a vertex corresponding to the first virtual circle and a vertex corresponding to the second virtual circle, then dividing it, and then scaling it into a standard trapezoid. Claim 5 A method for determining the authenticity of a seal according to claim 3, wherein the step of generating a square using each of the auxiliary circles on the plurality of sectors and restoring the bit structure by connecting each of the squares includes: a step of determining a start position and an end position using the length of the dash between the gaps; and a step of determining the dash between the start position and the end position as a decoding target. Claim 6 A method for determining the authenticity of a seal according to claim 1, wherein the step of generating a square using each of the plurality of auxiliary circles on the sector and restoring the bit structure by connecting each of the squares includes the step of determining whether the bit value is 0 or 1 using the length of the dash between the gaps and then combining them to derive a code value. Claim 7 A method for determining the authenticity of a seal, wherein the method comprises: a step of determining a bit structure composed of dashes of different lengths and gaps separating the dashes; and a step of inserting the bit structure by etching the perimeter of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal after adjusting the ratio of the dashes and gaps according to the perimeter of the code insertion surface among the sealing surfaces of the anti-counterfeiting seal. Claim 8 A method for determining the authenticity of a seal according to claim 6, wherein the bit structure is composed of dashes of different lengths and gaps formed by connecting a specific number of standard length dashes according to a control bit, a data length type bit, a data bit, and a checksum.

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