JPH082155A - Prevention of alteration of prepaid card - Google Patents
Prevention of alteration of prepaid cardInfo
- Publication number
- JPH082155A JPH082155A JP6160716A JP16071694A JPH082155A JP H082155 A JPH082155 A JP H082155A JP 6160716 A JP6160716 A JP 6160716A JP 16071694 A JP16071694 A JP 16071694A JP H082155 A JPH082155 A JP H082155A
- Authority
- JP
- Japan
- Prior art keywords
- recording layer
- prepaid card
- magnetic recording
- remaining amount
- money
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000002265 prevention Effects 0.000 title claims description 4
- 230000004075 alteration Effects 0.000 title abstract 3
- 238000000034 method Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000010409 thin film Substances 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 83
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Landscapes
- Credit Cards Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はプリペイドカードの改ざ
ん防止方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preventing tampering with a prepaid card.
【０００２】[0002]
【従来の技術】最近、現金の代わりとして所定の金額を
使い切るまで使用できるプリペイドカードがテレホンカ
ード、乗車券カード、回数券カード、買い物用カードと
して多く使用されている。そしてこれらのカードには利
用金額、残額等を、ロイコ染料等からなる感熱記録層に
記録して表示するか、ないしはカード自体に孔をあける
等の方法により、利用金額、残額等を目視可能に表示す
る方法等が採用されている。2. Description of the Related Art Recently, prepaid cards, which can be used until a predetermined amount of money is used in place of cash, are widely used as telephone cards, ticket cards, coupon cards, and shopping cards. Then, the usage amount, the remaining amount, etc. can be visually displayed by recording the usage amount, the remaining amount, etc. on a thermosensitive recording layer made of a leuco dye, or by making a hole in the card itself. The display method is adopted.
【０００３】上記のような感熱記録層への利用金額、残
額等の表示ないしはカードへの穿孔は、利用者が目視に
より利用金額、残額等を知ることができる便利さを提供
すると共に、感熱記録層に表示された金額ないしはカー
ドへの穿孔の状態を確認することにより、プリペイドカ
ードの不正使用を防止する機能を有するものである。し
かしながら、プリペイドカードを目視により確認できな
いテレホンカード、乗車券カード、回数券カードのよう
な用途や目視によりチエツクが行われないような用途に
おいては、現在、プリペイドカードの読取り装置には感
熱記録層に表示された内容ないしは穿孔の状態を自動的
に読取り、その内容をチエツクする機能を有していない
ため、結局は磁気記録層に書込まれているデータを書き
換えることにより、プリペイドカードの金額が改ざんさ
れ不正使用されてしまうという欠点を有している。Displaying the amount of money used, the balance, etc. on the heat-sensitive recording layer or punching the card as described above provides the convenience of allowing the user to visually recognize the amount of money used, the balance, etc. By checking the amount of money displayed on the layer or the state of perforation on the card, it has a function of preventing unauthorized use of the prepaid card. However, in applications such as telephone cards, ticket cards, coupon cards, etc. where the prepaid card cannot be visually confirmed, or in applications where the check is not performed visually, the thermal recording layer is currently used in the prepaid card reader. Since it does not have a function to automatically read the displayed content or the state of punching and check the content, the amount of the prepaid card is tampered with by overwriting the data written in the magnetic recording layer. It has the disadvantage of being illegally used.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、感熱
記録層に使用金額、残額等を表示して利用者に便利さを
提供すると同時に、感熱記録層への表示により、プリペ
イドカードの金額の改ざんをチエツクできる機能を具備
させた、プリペイドカードの改ざん防止方法を提供する
ことである。SUMMARY OF THE INVENTION It is an object of the present invention to provide the user convenience by displaying the amount of money used, the balance, etc. on the thermosensitive recording layer, and at the same time, to display the amount of money of a prepaid card by displaying it on the thermosensitive recording layer. It is to provide a method of preventing tampering with a prepaid card, which is provided with a function capable of checking tampering with.
【０００５】[0005]
【課題を解決するための手段】磁気記録層と感熱記録層
とを備えた感熱磁気記録媒体からなるプリペイドカード
と、前記感熱記録層に印字する機能と前記感熱記録層に
印字された記号を光学的に認識する機能と前記プリペイ
ドカードの前記磁気記録層にデータを読取り書込める機
能を有する装置とを使用して、前記プリペイドカードの
前記感熱記録層に光学的に認識可能な暗号化コードにて
残金額を印字すると共に、該暗号化コードに対応した前
記残金額を前記磁気記録層に記録しておき、前記感熱記
録層に印字された前記暗号化コードを光学的に認識し、
前記磁気記録層に記録されている前記残金額とを対比し
て、前記暗号化コードと前記残金額とが一致するかどう
かで真偽を判別することを特徴とするプリペイドカード
の改ざん防止方法である。A prepaid card composed of a thermosensitive magnetic recording medium having a magnetic recording layer and a thermosensitive recording layer, a function of printing on the thermosensitive recording layer, and an optical function of a symbol printed on the thermosensitive recording layer. By using an encryption code that is optically recognizable in the heat-sensitive recording layer of the prepaid card by using a device having a function of recognizing data and a device having a function of reading and writing data in the magnetic recording layer of the prepaid card. While printing the remaining amount of money, the remaining amount of money corresponding to the encryption code is recorded in the magnetic recording layer, and the encryption code printed on the heat-sensitive recording layer is optically recognized,
A method of preventing tampering with a prepaid card, characterized by comparing the remaining amount of money recorded in the magnetic recording layer and determining whether or not the encryption code and the remaining amount of money match. is there.
【０００６】前記暗号化コードを残金額及び前記磁気記
録層に記録可能な利用日時や利用回数等の別の数字から
導かれるものであることを特徴とする上記のプリペイド
カードの改ざん防止方法である。[0006] The tampering prevention method for a prepaid card, wherein the encryption code is derived from other figures such as the remaining amount of money and the date and time of use and the number of times of use that can be recorded on the magnetic recording layer. .
【０００７】前記感熱記録層が低融点金属薄膜層で構成
されていることを特徴とする上記のプリペイドカードの
改ざん防止方法である。In the method of preventing tampering with a prepaid card, the heat-sensitive recording layer is formed of a low melting point metal thin film layer.
【０００８】[0008]
【作用】感熱記録層を備えたプリペイドカードと、感熱
記録層に印字された記号を光学的に認識する機能を備え
たプリペイドカード読取り装置を使用することにより、
感熱記録層に残金額を暗号化コードにて印字すると同時
に暗号化コードに対応した残金額を磁気記録層に記録し
ておき、感熱記録層に印字された暗号化コードを光学的
に認識して磁気記録層に記録された残金額と対比してプ
リペイドカードの真偽を判定する方法をとることによ
り、磁気記録層の金額を書き換える等の改ざんを行つた
プリペイドカードを容易に判別することが可能になる。
また、感熱記録層をロイコ染料を使用した感熱記録層よ
りも熱に対してより安定性のある低融点金属薄膜層で構
成することにより、該感熱記録層は熱及び圧を加えない
と発色することがないので、誤つてカードに熱がかかつ
た場合においても感熱記録層の印字が汚損されることが
なく安定しており、認識不能ないしは誤認識のおそれが
なくなり信頼性が高くなる。By using a prepaid card having a heat sensitive recording layer and a prepaid card reader having a function of optically recognizing a symbol printed on the heat sensitive recording layer,
The remaining amount of money is printed on the thermosensitive recording layer with an encrypted code, and at the same time, the remaining amount of money corresponding to the encrypted code is recorded on the magnetic recording layer, and the encrypted code printed on the thermal recording layer is optically recognized. By deciding the authenticity of the prepaid card by comparing it with the remaining amount recorded on the magnetic recording layer, it is possible to easily discriminate the prepaid card that has been tampered with, such as rewriting the amount of money on the magnetic recording layer. become.
Further, the heat-sensitive recording layer is composed of a low-melting-point metal thin film layer which is more stable to heat than the heat-sensitive recording layer using a leuco dye, so that the heat-sensitive recording layer develops color when heat and pressure are not applied. Therefore, even if the card is erroneously heated, the print on the thermal recording layer is not contaminated and is stable, and there is no risk of unrecognizable or erroneous recognition, resulting in high reliability.
【０００９】[0009]
【実施例】以下、図面を引用して本発明を説明する。図
１は本発明のプリペイドカードの構成を示す断面図、図
２は本発明のプリペイドカードの感熱記録層への記録内
容を示し、（イ）は使用前の状態を示す図、（ロ）は使
用後の状態を示す図であつて、１は感熱磁気記録媒体、
２は基材層、３は磁気記録層、４は着色樹脂層、５は感
熱記録層、６は保護層、7a,7b は暗号化コードをそれぞ
れ示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a prepaid card of the present invention, FIG. 2 shows the recorded contents on a heat-sensitive recording layer of the prepaid card of the present invention, (a) shows a state before use, and (b) shows FIG. 1 is a diagram showing a state after use, in which 1 is a thermosensitive magnetic recording medium,
Reference numeral 2 is a base material layer, 3 is a magnetic recording layer, 4 is a colored resin layer, 5 is a heat-sensitive recording layer, 6 is a protective layer, and 7a and 7b are encryption codes.
【００１０】本発明のプリペイドカードは図１に示すよ
うに、表面から順に保護層６と感熱記録層５と着色樹脂
層４と磁気記録層３と基材層２を積層してなる感熱磁気
記録媒体１から構成されている。上記の着色樹脂層４は
感熱記録層５に記録された可視情報にコントラストを与
えて読み易くするものである。感熱磁気記録媒体１にお
ける感熱記録層５を低融点金属薄膜層にて形成すること
により、プリペイドカード１に誤つて熱を与えても感熱
記録層５が発色し難く、可視情報が光学的に認識不能に
なつたり誤認識されたりするおそれが無くなる。As shown in FIG. 1, the prepaid card of the present invention is a thermosensitive magnetic recording obtained by laminating a protective layer 6, a thermosensitive recording layer 5, a colored resin layer 4, a magnetic recording layer 3 and a base material layer 2 in this order from the surface. It is composed of the medium 1. The colored resin layer 4 gives a contrast to the visible information recorded on the heat-sensitive recording layer 5 to make it easier to read. By forming the heat-sensitive recording layer 5 of the heat-sensitive magnetic recording medium 1 with a low-melting-point metal thin film layer, even if the prepaid card 1 is erroneously given heat, the heat-sensitive recording layer 5 is less likely to develop color and visible information is optically recognized. There is no risk of being disabled or being erroneously recognized.
【００１１】プリペイドカードとして使用する感熱磁気
記録媒体１の感熱記録層５には、日付、利用金額、残金
額が数字にて可視的に印字されると同時に、残金額の数
字に対応した光学的に認識可能な暗号化コード7a,7b に
て印字される。それと同時に感熱磁気記録媒体１の磁気
記録層３には、上記暗号化コード7a,7b に対応した残金
額が記録される。又は、残金額の数字に利用日時や利用
回数等の数字から導かれるデータに対応した暗号化コー
ド7a,7b を感熱記録層５に印字すると同時に、上記デー
タを磁気記録層３に記録される。On the heat-sensitive recording layer 5 of the heat-sensitive magnetic recording medium 1 used as a prepaid card, the date, the amount of money used, and the remaining amount are visually printed numerically, and at the same time, an optical value corresponding to the number of the remaining amount is used. It is printed with the encrypted code 7a, 7b that can be recognized by. At the same time, the remaining amount of money corresponding to the encrypted codes 7a and 7b is recorded on the magnetic recording layer 3 of the thermosensitive magnetic recording medium 1. Alternatively, the above-mentioned data is recorded on the magnetic recording layer 3 at the same time when the encryption codes 7a and 7b corresponding to the data derived from the number of the remaining amount of money and the number of times of use and the like are printed on the thermal recording layer 5.
【００１２】図２に示す具体例について説明すると、例
えば３０００円分の利用が可能なプリペイドカードの場
合には、図２（イ）に示すように感熱記録層５に残金額
として３０００の数字と、３０００に対応した暗号化コ
ード7aが印字されている。磁気記録層３には３０００の
数字が記録されている。次に、このプリペイドカードで
５３０円分の金額を利用した時、図２（ロ）に示すよう
に、感熱記録層５には日付、利用金額、残金額等の利用
履歴と、残金額の２４７０の数字に対応した暗号化コー
ド7bが新たに印字される。同時に磁気記録層３に記録さ
れている残金額の３０００の数字が、新たな残金額の２
４７０の数字に書換えられる。この時、例えば日付の０
２２５を磁気記録層３に記録し、かつ残金額２４７０と
合計したもの、即ち、２６９５を暗号化コード7bとして
印字するようにしても良いものである。また、印字はさ
れていないが最初に入力（この場合は３０００円）する
日付や時刻を磁気記録層３に書き込むと共に残金額３０
００と合計する等により、利用金額が同じでも印字され
る暗号化コード7bが違うカードを作製可能となり、より
高い改ざん防止効果を得られる。また、ここでは利用日
や時刻を合計することで説明を行つたが、利用回数や印
字される段数（印字箇所）、利用金額等を掛け合わせた
り、数字を連続して並べたりする等、適当な演算により
導けるものであれば良いのはもちろんのことである。Explaining the specific example shown in FIG. 2, for example, in the case of a prepaid card that can be used for 3000 yen, as shown in FIG. The encrypted code 7a corresponding to 3000 is printed. A number of 3000 is recorded on the magnetic recording layer 3. Next, when the amount of money of 530 yen is used with this prepaid card, as shown in FIG. 2B, the thermal recording layer 5 has a history of use such as date, amount of money used, amount of money left and 2470 of the amount left. The encrypted code 7b corresponding to the number is newly printed. At the same time, the number of the remaining amount of 3000 recorded on the magnetic recording layer 3 is the new remaining amount of 2
It is rewritten to the number of 470. At this time, for example, the date 0
It is also possible to record 225 on the magnetic recording layer 3 and to add up with the remaining amount 2470, that is, 2695 to be printed as the encryption code 7b. Although not printed, the date and time of the first input (3000 yen in this case) is written in the magnetic recording layer 3 and the balance 30
By summing with 00, it is possible to produce a card with a different encryption code 7b to be printed even if the usage amount is the same, and a higher tampering prevention effect can be obtained. In addition, although the explanation was given here by totaling the dates and times of use, it is appropriate to multiply by the number of times of use, the number of columns to be printed (printing location), the amount of money used, etc., or to arrange numbers consecutively. It goes without saying that it can be derived by any calculation.
【００１３】上記プリペイドカードを改ざんしようとし
て、従来のプリペイドカードのように磁気記録層３に記
録された残金額を改ざんして書き込んだとしても、改ざ
んしようとする残金額に対応した暗号化コード7a,7b が
不明であるために、感熱記録層５に磁気記録層３に記録
した残金額に対応した正確な暗号化コード7a,7b を記録
することができない。したがつて、磁気記録層３に改ざ
んした残金額を記録することはできても、感熱記録層５
の印字を光学的に認識できる装置を備えたプリペイドカ
ード読取り装置を通した時に、暗号化コード7a,7b を残
金額として認識できないので、また、たとえ暗号化コー
ド7a,7b を残金額として認識できたとしても、感熱記録
層５に記録された残金額と一致しないので、不正利用を
容易に判別できる。Even if the prepaid card is falsified and the remaining amount of money recorded on the magnetic recording layer 3 is falsified and written like a conventional prepaid card, the encryption code 7a corresponding to the remaining amount of money to be falsified. Since 7 and 7b are unknown, the correct encrypted codes 7a and 7b corresponding to the remaining amount of money recorded on the magnetic recording layer 3 cannot be recorded on the thermosensitive recording layer 5. Therefore, although the falsified balance can be recorded on the magnetic recording layer 3, the thermal recording layer 5
When passing through a prepaid card reader equipped with a device that can optically recognize the printout, the encryption codes 7a and 7b cannot be recognized as the remaining amount of money, and even if the encryption codes 7a and 7b can be recognized as the remaining amount of money. Even if it does, since it does not match the remaining amount of money recorded in the thermosensitive recording layer 5, it is possible to easily discriminate illegal use.
【００１４】感熱磁気記録媒体１を構成する材料につい
ては、基材層２として２軸延伸ポリエチレンテレフタレ
ート、剛性のある紙、ないしはそれらの積層体が使用さ
れ、磁気記録層３としては従来公知のものが使用され
る。着色樹脂層４としてはアクリル系樹脂、ポリ塩化ビ
ニル樹脂、塩化ビニル−酢酸ビニル共重合樹脂、ポリエ
ステル系樹脂等からなるインキバインダーに着色すべき
色に応じて各種顔料を添加したインキにて印刷、コーテ
イングにより２〜５ミクロンの厚さに形成する。低融点
金属薄膜層としてはＳn,Ｉn,Ｂi,Ｐb,Ｔe 等からなる金
属を着色樹脂層４上に真空蒸着、スパツタ法により形成
する。この低融点金属薄膜層は感熱記録層しての役割を
果たすため低融点のもので、膜厚が５００〜１０００オ
ングストロームが好ましい。保護層６としてはウレタン
系樹脂、アクリル系樹脂、ポリ塩化ビニル樹脂等にて厚
さ１〜３ミクロンに形成する。上記のように、感熱記録
層を低融点金属薄膜層にて形成することにより、従来の
ロイコ染料を使用したタイプのように、熱による影響を
受けないので、カードに誤って熱がかかつた場合におい
ても、認識不能ないしは誤認識のおそれがなくなり感熱
記録層への印字の信頼性が高まる。As the material constituting the thermosensitive magnetic recording medium 1, biaxially oriented polyethylene terephthalate, rigid paper, or a laminated body thereof is used as the base material layer 2, and the magnetic recording layer 3 is a conventionally known material. Is used. The colored resin layer 4 is printed with an ink containing an acrylic resin, a polyvinyl chloride resin, a vinyl chloride-vinyl acetate copolymer resin, a polyester resin or the like and various pigments added according to the color to be colored, It is formed to a thickness of 2 to 5 microns by coating. As the low melting point metal thin film layer, a metal made of Sn, In, Bi, Pb, Te or the like is formed on the colored resin layer 4 by vacuum deposition and a sputtering method. Since this low melting point metal thin film layer plays a role as a thermal recording layer, it has a low melting point and preferably has a film thickness of 500 to 1000 angstroms. The protective layer 6 is made of urethane resin, acrylic resin, polyvinyl chloride resin or the like and has a thickness of 1 to 3 μm. As described above, by forming the heat-sensitive recording layer with the low-melting-point metal thin film layer, it is not affected by heat unlike the type using a conventional leuco dye, so that the card is erroneously heated. Even in this case, there is no possibility of unrecognizable or erroneous recognition, and the reliability of printing on the thermal recording layer is improved.
【００１５】[0015]
【発明の効果】基体層に磁気記録層と感熱記録層とを形
成した構成の感熱磁気記録媒体にてプリペイドカードを
構成し、感熱記録層に残金額等を光学的に認識可能な暗
号化コードにて可視的に印字すると同時に、磁気記録層
には暗号化コードに対応した残金額を記録しておくこと
により、感熱記録層に印字された暗号化コードを光学的
に認識して、磁気記録層に記録れた残金額と対比するこ
とによりプリペイドカードの真偽を判別できるのでプリ
ペイドカードの改ざんを防止することができる。EFFECT OF THE INVENTION A prepaid card is composed of a thermosensitive magnetic recording medium having a magnetic recording layer and a thermosensitive recording layer formed on a base layer, and an encryption code capable of optically recognizing the remaining amount of money etc. on the thermosensitive recording layer. At the same time as visually printing on the magnetic recording layer, the remaining amount of money corresponding to the encrypted code is recorded on the magnetic recording layer so that the encrypted code printed on the thermal recording layer can be optically recognized and the magnetic recording can be performed. Since it is possible to determine the authenticity of the prepaid card by comparing it with the remaining amount recorded in the layer, it is possible to prevent tampering with the prepaid card.
【図１】本発明のプリペイドカードの構成を示す断面
図。FIG. 1 is a cross-sectional view showing a configuration of a prepaid card of the present invention.
【図２】本発明のプリペイドカードの感熱記録層への記
録内容を示し、（イ）は使用前の状態を示す図、（ロ）
は使用後の状態を示す図。FIG. 2 shows the recorded contents on the thermosensitive recording layer of the prepaid card of the present invention, (a) showing a state before use, (b)
The figure which shows the state after use.
１ 感熱磁気記録媒体 ２ 基材層 ３ 磁気記録層 ４ 着色樹脂層 ５ 感熱記録層 ６ 保護層 7a, 7b 暗号化コード 1 thermosensitive magnetic recording medium 2 base material layer 3 magnetic recording layer 4 colored resin layer 5 thermosensitive recording layer 6 protective layer 7a, 7b encryption code
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０６Ｋ 19/06 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location G06K 19/06
Claims (3)
磁気記録媒体からなるプリペイドカードと、前記感熱記
録層に印字する機能と前記感熱記録層に印字された記号
を光学的に認識する機能と前記プリペイドカードの前記
磁気記録層にデータを読取り書込める機能を有する装置
とを使用して、前記プリペイドカードの前記感熱記録層
に光学的に認識可能な暗号化コードにて残金額を印字す
ると共に、該暗号化コードに対応した前記残金額を前記
磁気記録層に記録しておき、前記感熱記録層に印字され
た前記暗号化コードを光学的に認識し、前記磁気記録層
に記録されている前記残金額とを対比して、前記暗号化
コードと前記残金額とが一致するかどうかで真偽を判別
することを特徴とするプリペイドカードの改ざん防止方
法。1. A prepaid card composed of a thermosensitive magnetic recording medium having a magnetic recording layer and a thermosensitive recording layer, a function of printing on the thermosensitive recording layer, and optically recognizing a symbol printed on the thermosensitive recording layer. Function and a device having a function of reading and writing data in the magnetic recording layer of the prepaid card, the remaining amount is printed on the thermosensitive recording layer of the prepaid card with an optically recognizable encryption code. At the same time, the remaining amount of money corresponding to the encrypted code is recorded in the magnetic recording layer, the encrypted code printed on the heat-sensitive recording layer is optically recognized, and recorded on the magnetic recording layer. A method for preventing tampering with a prepaid card, characterized in that the authenticity is determined by comparing the remaining amount of money with the remaining amount of money and whether or not the encryption code and the remaining amount of money match.
記録層に記録可能な利用日時や利用回数等の別の数字か
ら導かれるものであることを特徴とする請求項１記載の
プリペイドカードの改ざん防止方法。2. The prepaid card according to claim 1, wherein the encryption code is derived from the remaining amount of money and another number such as the date and time of use and the number of uses that can be recorded in the magnetic recording layer. Tamper proof method.
成されていることを特徴とする請求項１、２記載のプリ
ペイドカードの改ざん防止方法。3. The tampering prevention method for a prepaid card according to claim 1, wherein the heat-sensitive recording layer is composed of a low melting point metal thin film layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6160716A JPH082155A (en) | 1994-06-21 | 1994-06-21 | Prevention of alteration of prepaid card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6160716A JPH082155A (en) | 1994-06-21 | 1994-06-21 | Prevention of alteration of prepaid card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH082155A true JPH082155A (en) | 1996-01-09 |
Family
ID=15720932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6160716A Withdrawn JPH082155A (en) | 1994-06-21 | 1994-06-21 | Prevention of alteration of prepaid card |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH082155A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7533267B2 (en) | 2002-07-10 | 2009-05-12 | Sharp Kabushiki Kaisha | Anti-tampering signature method for rewritable media, anti-tampering signature apparatus for executing the method, anti-tampering signature system provided with the apparatus, and computer-readable recording medium storing anti-tampering signature program for achieving the method |
-
1994
- 1994-06-21 JP JP6160716A patent/JPH082155A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7533267B2 (en) | 2002-07-10 | 2009-05-12 | Sharp Kabushiki Kaisha | Anti-tampering signature method for rewritable media, anti-tampering signature apparatus for executing the method, anti-tampering signature system provided with the apparatus, and computer-readable recording medium storing anti-tampering signature program for achieving the method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010904 |