CN113742796A - Optical encryption security device and encryption method for smart card and smart card - Google Patents
Optical encryption security device and encryption method for smart card and smart card Download PDFInfo
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- CN113742796A CN113742796A CN202110896840.0A CN202110896840A CN113742796A CN 113742796 A CN113742796 A CN 113742796A CN 202110896840 A CN202110896840 A CN 202110896840A CN 113742796 A CN113742796 A CN 113742796A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 22
- 238000009826 distribution Methods 0.000 claims abstract description 38
- 230000001678 irradiating effect Effects 0.000 claims abstract description 4
- 230000004888 barrier function Effects 0.000 claims description 15
- 238000002834 transmittance Methods 0.000 claims description 4
- 238000013507 mapping Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
- G06F21/77—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information in smart cards
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory
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- Software Systems (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Credit Cards Or The Like (AREA)
Abstract
The invention discloses an optical encryption safety device for a smart card, which comprises a light guide plate and a light-emitting device, wherein the light guide plate is at least provided with a first incident/emergent surface and a second incident/emergent surface which can allow light to enter and exit and a reflecting surface which can allow the light to reflect; the light-emitting device is provided with at least one light source for irradiating light rays on the first incident/emergent surface; the light guide plate is characterized in that the reflecting surface of the light guide plate is provided with a microstructure, the microstructure is used for breaking total reflection of light rays, the light rays emitted by the light emitting device are guided to the microstructure in the light guide plate from the first incident/emergent surface, the microstructure breaks the total reflection and is emergent from the second incident/emergent surface to form a prefabricated light intensity distribution pattern, and the prefabricated light intensity distribution pattern records information. The encryption safety device has the advantages of simple structure, good usability and low cost, and information is recorded by utilizing light intensity distribution to encrypt the information; and by combining with the electric control IC chip, tighter safety guarantee can be realized on information.
Description
Technical Field
The invention belongs to the technical field of encryption of smart cards, and particularly relates to an optical encryption safety device and an encryption method for a smart card and the smart card.
Background
Currently, smart cards have found wide application in many areas, particularly in some applications related to stored value prestoring, identity authentication, and finance. Although smart cards have unique security reliability compared to magnetic stripe cards, with the increasing popularity of smart cards, special attack techniques for security vulnerabilities of smart cards are also being developed. The smart card can conveniently employ PIN verification, encryption techniques, authentication techniques, etc. to enhance the security of the smart card, but this does not mean that the smart card is absolutely secure. Various potential threats are encountered during the design stage, production environment, production flow and use of smart cards. An attacker may take various detection methods to obtain sensitive data such as hardware security mechanisms, access control mechanisms, authentication mechanisms, data protection systems, memory bank partitions, design details of cryptographic module programs, initialization data, private data, passwords or cryptographic keys, and may illegally obtain access to the smart card by modifying important security data on the smart card. These attacks pose a significant threat to the security of the smart card.
The smart card is related to the safety of all levels and is closely related to economic life. The smart card application system is a system with a complex security environment, the effectiveness of the smart card attack method is based on the fact that the benefits obtained by an attacker are higher than the time, energy, expense and the like consumed by the attacker, and the skills of precautionary measures are mainly to increase the difficulty and cost of attack success. However, these countermeasures will increase the complexity and cost of the design. An encryption authentication method for reducing the security threat of the smart card and the security cost is urgently needed in the market.
Patent publication CN 106796664 discloses a portable data carrier, the body further comprising a light-impermeable cover layer, and a light source, which extends in a planar form over at least a part of the area of the body of the data carrier and emits light uniformly over the light source extension area of the body, the light source being energized by transmission to a contactless interface, wherein the cover layer has at least one light-transmitting channel in at least one location for transmitting the light emitted by the light source, and a personalized luminescent pattern can be displayed on the data carrier, which can also be used for security features on document documents of title (e.g. identity cards, passports, drivers licenses, etc.). The method does not encrypt information and cannot provide safety guarantee for the smart card.
Disclosure of Invention
1. Objects of the invention
Aiming at the technical problems, the optical encryption safety device, the encryption method and the smart card for the smart card are provided, the encryption safety device has the advantages of simple structure, good usability and low cost, and information is recorded by utilizing light intensity distribution to encrypt the information; and by combining with the electric control IC chip, tighter safety guarantee can be realized on information.
2. The technical scheme adopted by the invention
An optical encryption security device for a smart card comprises a light guide plate and a light emitting device, wherein the thickness of the light guide plate is 0.1-6 mm, and the light guide plate at least comprises a first incident/emergent surface and a second incident/emergent surface which can allow light to enter and exit and a reflecting surface which can allow light to reflect;
the light-emitting device is provided with at least one light source for irradiating light rays on the first incident/emergent surface;
the light guide plate is characterized in that the reflecting surface of the light guide plate is provided with a microstructure, the microstructure is used for breaking total reflection of light rays, the light rays emitted by the light emitting device are guided to the microstructure in the light guide plate from the first incident/emergent surface, the microstructure breaks the total reflection and is emergent from the second incident/emergent surface to form a prefabricated light intensity distribution pattern, and the prefabricated light intensity distribution pattern records information.
In a preferred technical solution, the microstructures are protrusions distributed in a certain manner.
In the preferred technical scheme, different light intensity distribution patterns are formed by adjusting the shape, arrangement method, spacing, protrusion height or size of the protrusions of the microstructure.
In an optimal technical scheme, a reflecting sheet is arranged below a reflecting surface of the light guide plate, a light barrier is arranged on the periphery of the reflecting plate, a groove is formed in the light barrier, the light guide plate and the light emitting device are placed in the light barrier, and the inner side surface of the light barrier is a reflecting surface.
In a preferred technical scheme, the light source is a surface light source and is arranged on the first incident/emergent surface of the light guide plate.
In the preferred technical scheme, the microstructures are spherical protrusions and are arranged in a rectangular shape, the radius is 0.02mm-1mm, the height is 0.01-0.5 mm, the distance between every two adjacent microstructures is 0.01-0.5 mm, and the optical properties are 96% of transmittance and 4% of reflectivity.
The invention also discloses an optical encryption method for the smart card, which comprises the following steps:
s01: establishing a one-to-one mapping relation between different light intensity distribution patterns and different information;
s02: and guiding the light emitted by the light emitting device from the first incident/emergent surface to the microstructures in the light guide plate, breaking the total reflection by the microstructures, and emitting from the second incident/emergent surface to form a prefabricated light intensity distribution pattern.
In a preferred embodiment, after step S02, the method further includes: different light intensity distribution patterns are formed by adjusting the shape, arrangement method, spacing, protrusion height or size of the protrusions of the microstructure.
The invention also discloses a smart card with the optical encryption safety device, which comprises a smart card body, wherein any optical encryption safety device for the smart card is arranged in the smart card body.
3. Advantageous effects adopted by the present invention
The encryption safety device has the advantages of simple structure, good usability and low cost. Recording information by using the light intensity distribution, and encrypting the information; the incorporation of the security device in the smart card prevents the manipulation of the smart card behavior by analyzing the communication interface or observing certain physical quantities in the disturbing circuit. The physical attack to the intelligent card can damage the light path at the same time, so that the unique light intensity distribution pattern is changed, the authentication of the intelligent card fails, and the safety is ensured.
Drawings
FIG. 1 is a schematic structural diagram of an optical encryption security device for smart cards according to a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of an optical encryption security device for smart cards in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a light barrier according to the present invention;
FIG. 4 is a schematic structural view of a triangular prism light guide plate according to the present invention;
FIG. 5 is a schematic structural diagram of a spherical protrusion microstructure according to the present invention;
fig. 6 is a flow chart of the optical encryption method for a smart card of the present invention.
Detailed Description
The technical solutions in the examples of the present invention are clearly and completely described below with reference to the drawings in the examples of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, an optical encryption security device for smart cards comprises a light guide plate 10 and a light emitting device 20, wherein the light guide plate 10 has a thickness of 0.1-6 mm, and the light guide plate 10 at least has a first incident/exit surface 11, a second incident/exit surface 12 and a reflective surface 13 for reflecting light;
the light emitting device 20 has at least one light source for irradiating light to the first incident/exit surface 11;
as shown in fig. 2, the reflecting surface 13 of the light guide plate 10 is provided with a microstructure 14, the microstructure 14 is used for breaking total reflection of light, light emitted from the light emitting device 20 is guided from the first incident/exit surface 11 to the microstructure 14 in the light guide plate, and the light is broken by the microstructure 14 and emitted from the second incident/exit surface 12 to form a prefabricated light intensity distribution pattern, and the prefabricated light intensity distribution pattern records information.
In a preferred implementation, referring to fig. 1 and fig. 2, a reflective sheet 30 is disposed below the reflective surface 13 of the light guide plate 10, a light barrier 40 is disposed on the periphery of the light guide plate 10, the light barrier 40 may be an independent barrier or may be connected to form a plate, as shown in fig. 3, a groove 41 is disposed in the light barrier 40, the light guide plate 10 and the light emitting device 20 are disposed in the groove 41 in the light barrier, and an inner side 42 of the light barrier 40 is a reflective surface. The light can be further fully utilized, and the influence of stray light on the receiving surface is reduced.
The reflector 30 is used to reflect the light from the light guide plate 10 transmitted through the microstructures 14, so that the light enters the light guide plate 10 again for optical transmission, thereby improving the light energy utilization rate, and the length, width and height of the reflector can be set according to the size of the light guide plate, for example, the length is 12 mm, the width is 0.1 mm, and the height is 5mm, and the optical property of the upper surface of the reflector is set as total reflection.
The light source of the light emitting device 20 is a blue or violet light emitting diode, and is located at any position on the side surface, the bottom surface, or between the two of the light guide plate 10. Preferably, the light source is a surface light source, and is disposed on the first incident/exit surface 11 of the light guide plate 10.
The light guide plate 10 is made of polymethyl methacrylate (PMMA), Polycarbonate (PC), etc., which generally have high transmittance to light and maintain good performance at a use temperature, and the processing method mainly includes a printing type and a non-printing type.
The light guide plate 10 may be divided into a flat plate and an inclined plate (wedge plate). As shown in fig. 2, the flat light guide plate: when light enters the light guide plate, when the incident angle of the light is larger than the critical angle, the light is totally reflected inside the light guide plate, so that the light cannot be emitted, and the microstructures (scattering dots) acting on the bottom force the light to be scattered, so that the total reflection is damaged, and finally, part of the light can be emitted from an expected light emitting surface.
Sloping plate light guide plate: the mechanism of the inclined plate light guide plate for destroying the total reflection phenomenon is that the inclined plate light guide plate is designed in shape, one end far away from the light source is thinner than one end close to the light source, and the whole inclined plate light guide plate is wedge-shaped, so that the light source meets the reflection law and can be finally emitted from the upper surface of the light guide plate.
The shape of the light guide plate 10 may be a square, a triangular prism, a cylinder, or other shapes, and is not limited herein. As shown in fig. 4, the light-blocking plate 40 of the triangular prism light guide plate 10 is also triangular prism-shaped. However, a cube is generally used, and this embodiment will be described by taking a cube as an example.
In a preferred embodiment, the microstructures are protrusions distributed in a certain pattern, but may also be holes distributed in a certain pattern, and generally, protrusions that are easier to implement are used. The protrusions can be formed on the light guide plate by machining, hot pressing, laser, screen printing, spraying or 3D printing.
The microstructures 14 can scatter light due to the particularity of their own structures, thereby destroying the total reflection of light in the light guide plate 10, and analysis of the total reflection reveals that the luminous fluxes of light emitted from the light guide plate 10 are different according to different distributions of the mesh points (microstructures) in the structures.
The cross-sectional shape of the microstructure may be one or a mixture of circular, square, regular polygonal, and the like. In a preferred embodiment, as shown in FIG. 5, the microstructures 14 are spherical protrusions and are arranged in a rectangle with a radius of 0.02mm-1mm, a spacing between adjacent microstructures is 0.01-0.5 mm, and the optical properties are 96% transmittance and 4% reflectance. In another embodiment, if the cross-sectional shape of the microstructure is a regular polygon, the diameter of the circumscribed circle of the regular polygon microstructure is 0.02mm-1mm, the height is 0.01-0.5 mm, and the distance between adjacent microstructures is 0.01-0.5 mm.
Different light intensity distribution patterns are formed by adjusting the shape, arrangement method, spacing, protrusion height or size of the protrusions of the microstructure.
Example 2
As shown in fig. 6, the present invention also discloses an optical encryption method for a smart card, comprising the following steps:
s01: establishing a one-to-one mapping relation between different light intensity distribution patterns and different information;
s02: and guiding the light emitted by the light emitting device from the first incident/emergent surface to the microstructure mesh points in the light guide plate, breaking the total reflection by the microstructures and emitting from the second incident/emergent surface to form a prefabricated light intensity distribution pattern.
Step S02 is followed by: different light intensity distribution patterns are formed by adjusting the shape, arrangement method, spacing, protrusion height or size of the protrusions of the microstructure.
Design and simulation are performed through optical simulation software (such as LightTools, tracepro, and the like), and in order to detect key parameters such as illumination, intensity, signal-to-noise ratio, and the like of light after the light passes through the encryption security device, a receiving surface needs to be added in the design. Depending on the size and position of the light guide plate, we set a solid piece 1mm above the light guide plate and parallel to the upper surface of the light guide plate, 12 mm long by 0.1 mm wide by 5mm high, then build a receiver on this surface, set its grid section, and set the optical properties of the receiving surface to optical absorption.
Iterative calculation is carried out by using an optical simulation software tool, the central wavelength of a light source is set to be 550 nanometers, the maximum full width at half maximum is set to be 20 nanometers, and the distribution of the net points and the two-dimensional distribution of the light intensity are observed. The grid profile and the corresponding intensity profile at a wavelength of 550nm are shown in the following table:
as can be seen from the above table, the dot distribution is iteratively changed without changing the wavelength of the light source, and each iteration is performed, there is a unique two-dimensional light intensity distribution corresponding to the dot distribution, and each group of distributions is different, so that it can be determined that each group can refer to information of one user.
In the case of changing the wavelength of the light source, i.e., adjusting the wavelength, the grid distribution map and the corresponding light intensity distribution map are shown in the following table:
it can be observed from the table that the spot distribution is completely different for each group.
During iterative calculation, the structure of the mesh point is changed in real time, the light intensity two-dimensional distribution is observed at the same time, comprehensive analysis is carried out by combining the light source wavelength, the result is obtained by analyzing, and each microstructure distribution has unique light intensity spatial distribution corresponding to the microstructure distribution, so that preliminary judgment can be carried out, and the designed light control chip can realize information encryption.
Example 3
The invention also discloses a smart card with the optical encryption safety device, which comprises a smart card body, wherein any optical encryption safety device for the smart card is arranged in the smart card body. The optical encryption safety device is embedded into the smart card, when the optical control and electric control smart card is carried in use, the detection system detects two systems at the same time, and after the two systems pass through detection, the smart card reads and writes information, so that the safety is greatly improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An optical encryption security device for a smart card comprises a light guide plate and a light emitting device, and is characterized in that the thickness of the light guide plate is 0.1-6 mm, and the light guide plate at least comprises a first incident/emergent surface and a second incident/emergent surface which can allow light to enter and exit and a reflecting surface which can allow light to reflect;
the light-emitting device is provided with at least one light source for irradiating light rays on the first incident/emergent surface;
the light guide plate is characterized in that the reflecting surface of the light guide plate is provided with a microstructure, the microstructure is used for breaking total reflection of light rays, the light rays emitted by the light emitting device are guided to the microstructure in the light guide plate from the first incident/emergent surface, the microstructure breaks the total reflection and is emergent from the second incident/emergent surface to form a prefabricated light intensity distribution pattern, and the prefabricated light intensity distribution pattern records information.
2. An optical encryption security device for smart cards according to claim 1 characterized in that said microstructures are protrusions distributed in a certain way.
3. The optical encryption security device for smart card as claimed in claim 2, wherein different light intensity distribution patterns are formed by adjusting the shape, arrangement method, pitch, height or size of the protrusions of the micro-structure.
4. The optical encryption security device for smart cards according to claim 1, wherein a reflective sheet is disposed under the reflective surface of the light guide plate, a light barrier is disposed on the periphery of the light guide plate, a groove is disposed in the light barrier, the light guide plate and the light emitting device are disposed in the light barrier, and the inner side surface of the light barrier is a reflective surface.
5. The optical encryption security device for smart card of claim 1, wherein the light source is a surface light source and is disposed on the first incident/exit surface of the light guide plate.
6. An optical encryption security device for smart cards according to claim 1 wherein the microstructures are spherical protrusions arranged in a rectangle with a radius of 0.02mm-1mm, a height of 0.01-0.5 mm, a spacing between adjacent microstructures of 0.01-0.5 mm, and optical properties of 96% transmittance and 4% reflectance.
7. An optical encryption method for a smart card, comprising the steps of:
s01: establishing a one-to-one mapping relation between different light intensity distribution patterns and different information;
s02: and guiding the light emitted by the light emitting device from the first incident/emergent surface to the microstructures in the light guide plate, breaking the total reflection by the microstructures, and emitting from the second incident/emergent surface to form a prefabricated light intensity distribution pattern.
8. The optical encryption method for smart card of claim 7, further comprising after said step S02: different light intensity distribution patterns are formed by adjusting the shape, arrangement method, spacing, protrusion height or size of the protrusions of the microstructure.
9. A smart card with an optical encryption security device, comprising a smart card body, wherein the optical encryption security device for smart cards according to any one of claims 1 to 6 is arranged in the smart card body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110896840.0A CN113742796A (en) | 2021-08-05 | 2021-08-05 | Optical encryption security device and encryption method for smart card and smart card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110896840.0A CN113742796A (en) | 2021-08-05 | 2021-08-05 | Optical encryption security device and encryption method for smart card and smart card |
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| CN113742796A true CN113742796A (en) | 2021-12-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114338007A (en) * | 2021-12-27 | 2022-04-12 | 中国电信股份有限公司 | Data processing method and device, electronic equipment and computer readable storage medium |
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| CN104360429A (en) * | 2014-10-23 | 2015-02-18 | 苏州向隆塑胶有限公司 | Light guide plate and method for machining same |
| CN213302566U (en) * | 2020-10-23 | 2021-05-28 | 苏州维旺科技有限公司 | Light guide plate and equipment for producing same |
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2021
- 2021-08-05 CN CN202110896840.0A patent/CN113742796A/en active Pending
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|---|---|---|---|---|
| US20100195174A1 (en) * | 2006-01-16 | 2010-08-05 | Securency International Pty. Ltd. | Data Storage in a Diffractive Optical Element |
| CN104360429A (en) * | 2014-10-23 | 2015-02-18 | 苏州向隆塑胶有限公司 | Light guide plate and method for machining same |
| CN213302566U (en) * | 2020-10-23 | 2021-05-28 | 苏州维旺科技有限公司 | Light guide plate and equipment for producing same |
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| 任龙飞 等: "微结构网点的半色调信息隐藏技术", 中国图象图形学报, vol. 21, no. 8, 16 August 2016 (2016-08-16), pages 1004 - 1009 * |
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| CN114338007A (en) * | 2021-12-27 | 2022-04-12 | 中国电信股份有限公司 | Data processing method and device, electronic equipment and computer readable storage medium |
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