RU2715175C1 - Device for protection against illegal reading or writing of rfid-labels - Google Patents

Abstract

FIELD: data processing.

SUBSTANCE: invention relates to protection against illegal reading of RFID-labels. Technical result is achieved due to device for protection against illegal reading or writing of RFID-labels, which is made in form of a multilayer structure, in the form of a plastic card, which includes face and reverse outer layers made of polyvinyl chloride. Face and reverse outer layers can contain one or more layers of polyvinyl chloride. Between the front and back outer layers there is a metal screening layer, which is a thin layer of conductive material made of metal. In order to seal the shielding layer, the outer layers of the card are tightly fixed to each other by sintering under pressure in a thermo press.

EFFECT: technical result is improved level of protection against illegal reading or writing RFID-labels.

2 cl, 3 dwg

Description

The invention relates to devices for protecting against illegal reading or writing of RFID tags.

The prior art such protective devices, which are wallets or cases with shielding inserts. Outwardly, they do not differ from ordinary wallets, but they have a layer of a metallized metal alloy film inside, which blocks different ranges of radio frequencies.

If there is no need to constantly carry a large number of cards, documents and money, then you can use more compact devices - special covers. They are usually made of leather, plastic, fabric and various synthetic materials, and like wallets and wallets, have a shielding gasket. When paying, a credit card may not even be completely removed from the case - just remove a part of the card with a chip.

The convenience of using a shielded case is also in that it is quite thin and small, therefore, it can be worn in a wallet or wallet. True, the use of several such cases will already become problematic.

Metal cases are convenient for carrying a large number of cards. To pay, you just need to extract the right one. But you need to wear a similar case separately, since it is great for a wallet or wallet.

The disadvantages of such devices are that the shielding layer in them is not properly protected, therefore, there are many reasons for its damage, which can be noticed only after a certain time, which significantly reduces protection and can lead to data leakage.

The closest analogue of the claimed device is the product from patent RU 2490732 (priority December 17, 2008), designed to protect information in radio frequency identification systems, with increased abrasion resistance, corrosion resistance, effective shielding, which prevents data theft.

The shielding product includes a polymer conductive layer and a protective layer located close to the polymer conductive layer, as well as an adhesive layer located between the polymer conductive layer and the protective layer. In this case, the polymer conductive layer provides electromagnetic shielding properties so as to prevent data from the RF information component from being received by the external device when the RF information component is located between the external device and the polymer conductive and protective layers or when the polymer conductive and protective layers are located between the external device and the radio frequency information component.

The polymer conductive layer comprises a polymer layer and a conductive layer located on the polymer layer.

The polymer layer contains polyester, or polycarbonate, or polypropylene, or polyethylene.

The conductive layer comprises a copper layer between the first nickel layer and the second nickel layer.

The adhesive layer may include pressure sensitive adhesive (PSA), hot melt adhesive (HAA), acrylic adhesive, non-conductive adhesive, conductive adhesive, or any other suitable adhesive.

An adhesive layer is used to attach the protective layer to the polymer conductive layer.

The disadvantage of this device is that for fixing the polymer and protective layer, an adhesive layer is used, which cannot provide the necessary integrity of the product, such as during sintering in a thermal press, in addition, the use of an adhesive layer complicates the manufacture of the product and leads to an increase in the cost of the entire structure whole.

Also, complicates the manufacture of the product and leads to its cost increase, the content in the conductive layer of a layer of copper, which must be located between the layers of Nickel.

The objective of the claimed device is to eliminate the disadvantages of the known device for protection against illegal reading or writing of RFID tags, namely, the cheaper design of the device and ease of manufacture of the device.

The technical result is the cheaper design of the device with the inner layer of the shielding material and the simplicity of its manufacture.

The essence of the claimed device in General is as follows:

The device for protection against illegal reading or writing of RFID tags is made in the form of a multilayer plastic card design, including the front and back outer layers made of polyvinyl chloride. The front and reverse outer layers may contain one or more layers of polyvinyl chloride. Between the front and back outer layers there is a metal shielding layer, which is a thin layer of a conductive material made of metal. Moreover, to seal the shielding layer, the outer layers of the card are sealed to each other, by sintering the multilayer structure of the plastic card under pressure in a thermal press. A method of obtaining a device for protecting against illegal reading or writing of RFID tags is that first they collect a package of a blank of a multilayer plastic card design from the front and back outer layers made of polyvinyl chloride, between which a metal shielding layer is placed, then, the edges of the blank sheets are fixed and carry out sintering under pressure in a thermal press to obtain a base from which a finished device is then cut out to protect against illegal reading or writing of RFID tags, after which they are checked and packaged inrush.

The invention is a device with an inner layer of shielding material, which prevents the passage of electromagnetic waves between the reader and the RFID proximity tag at a high frequency according to ISO 14443 and to a method for its manufacture.

The invention is a device in the form of a plastic card, with an inner shielding layer. The shielding layer may be a thin sheet of conductive material, for example, aluminum, an alloy of steel or copper. Also, the shielding layer may consist of a thin wire wound around a circle, mesh, or in any other way that provides reliable shielding.

The protective outer layers of the device can be made of any kind of plastic that can be used in a thermal press and not lose its properties after sintering, polyvinyl chloride is the optimal material for such purposes.

The dimensions of the claimed device approximately coincide with the sizes of the bank plastic card:

width - 85.6 (86 mm.),

height - 53.98 mm (54 mm.),

thickness - 0.76 mm (up to 1 mm.)

The claimed device can be made of various materials with any number of layers. The device can be monophonic, without printing, or with the printing of images made by means of full color or black and white printing. The principle of operation of the device is to create an obstacle to the connection of the RFID product and the reader using a shielding layer.

In FIG. 1 shows the layers of which the claimed device consists.

1 - the front layer of the plastic card;

2 - a shielding layer;

3 - a back layer of a plastic card.

The invention can successfully replace cases, wallets and other items with shielding material.

The main objective of the invention is the protection of illegal reading or writing of RFID tags. The product can be used to protect against unauthorized reading of contactless cards, such as: bank cards, transport cards, social cards, school cards, payment cards, access cards, access control cards and other cards.

In addition, the invention can be printed with a decorative information layer for the purpose of advertising and placing the necessary information, both on the front and on the back.

One of the main objectives of the invention is the creation of a safe and reliable tool for protection against unauthorized reading and writing of plastic, contactless RFID cards and other RFID tags.

Description of the principle of operation of the invention:

In the case when the invention is located between the reader and the RFID tag, when an electromagnetic field hits a metal surface, forced vibrations of free electrons arise on it, under the influence of an alternating electric field, the frequency of which is equal to the frequency of the incident field. These oscillations generate eddy currents in the conductor, which form a field directed opposite to the field of the reader, as a result, the quality of communication between the tag and the reader is significantly reduced and the reading of information becomes impossible, as shown in FIG. 2, where pos. 4 shows a card with an RFID tag, pos. 5 indicates the claimed device, pos. 6 indicates the reader.

A similar situation is observed when there is direct visibility between the reader and the tag. The presence of a conductive layer also impedes the quality of communication. The field generated by the reader induces eddy currents on the metal surface, which in turn generate a field directed opposite to the field of the reader. As a result, the communication efficiency of the reader with the tag is reduced (Fig. 3).

Also, the shielding material, located next to the tag antenna, affects the impedance of this antenna, as a result, the resonant frequency of the resulting communication circuit changes, which also leads to a deterioration or violation of the quality of reception / transmission.

Description and method of use in a particular case:

A plastic card with a shielding material was folded together with a plastic transport card and packed in a sealed transparent bag that cannot be opened without breaking its integrity. Thus, the product protects the transport card with a positive balance from illegal debit. The transport card can be replenished in advance for a certain number or time of travel, and purchased at any convenient point of sale of transport cards, while it will be protected from reading and writing. Using transport cards with a positive balance without invention is practically impossible, since you can use a card for travel without paying for it. This solution is a very convenient and safe way to organize mass sales of transport cards with a positive balance.

In this case, a method of manufacturing a plastic card that impedes the passage of electromagnetic radio waves is that between the front and back sides made of polyvinyl chloride, a special shielding material is laid, thus forming a multilayer structure (package) for the subsequent press-lamination process. After assembling the package, the edges of the sheets are fixed among themselves and baked.

A method of manufacturing a card includes the following steps:

1. Assembly of the package of the workpiece;

2. Fixing the edges of the sheets of the workpiece and sintering in a thermal press to obtain the basis.

3. The resulting multilayer structure is called the base, from which 24 cards are carved, after which they are checked and packaged. Further, the card, using an automatic packer, if necessary, can be combined with a transport, bank card or any other storage medium and sealed in a package of transparent plastic.

This manufacturing method allows you to get a convenient and practical product in the form of 24 plastic cards with shielding material, while they are absolutely safe for human health. This solution is a convenient and effective way to mass sell, for example, transport cards with a positive balance.

After removing from the package, a card with shielded material can be used in a wallet to protect against illegal reading of other types of contactless cards, including bank cards.

Claims (2)

1. Device for protection against illegal reading or writing of RFID tags, made in the form of a multilayer plastic card design, including the front and reverse outer layers made of polyvinyl chloride, and the front and reverse outer layers can contain one or more layers of polyvinyl chloride, and between the front and reverse outer layers there is a metal shielding layer, which is a thin layer of conductive material made of metal, while the outer layers of the car are used to seal the shielding layer you are tightly fixed to each other, by sintering a multilayer plastic card structure under pressure in a thermal press. 2. A method of obtaining a device according to claim 1, which consists in first collecting a package of a blank of a multilayer plastic card structure from the front and back outer layers made of polyvinyl chloride, between which a metal shielding layer is placed, then the edges of the blank sheets are fixed and sintering is performed under pressure in a thermal press to obtain a base from which the finished device is then cut out to protect against illegal reading or writing of RFID tags according to claim 1, after which they are checked and packaged.

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