JPS62279462A - Secret contents maintaining system for ic plastic card - Google Patents

Abstract

PURPOSE:To contrive the reduction of the possibility of leakage of secrets of a card even in case of an unlikely event by using two or more cards and so devising that the function is not effected when only one card is used and function is effected by combining another card and composing codes or bits. CONSTITUTION:The content of data to be stored is stored in a card writer (not shown in the figure). Then, a card 2 in which the assemblage of meaningless data is contained is prepared by using random numbers, etc. The content of the card 2 is logically operated in bit unit on the data stored in the card writer, and the data of ciphered form are written in a card 1. At the time of reading the card 1 and card 2 in which data are written, the data of the card 1 are read first, and then the data of the card 2 are read. Then, the read content of the card 1 and card 2 is stored in the machine, and logical operation reverse to the time of writing is made in bit unit, and the result is made as regular data.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention provides a method for safely and stably maintaining the confidentiality of information stored in an IC plastic card. This paper relates to a method for keeping confidential contents of IC plastic cards.

(Prior Art) Recently, development of IC cards has been progressing toward practical use. Nikkei Electronics 1985, 12 for IC cards
-2. As described in pages 275 to 292, there are various forms, but a typical one is shown in FIG.

In this Figure 4, 1 is a card, and this card 1
The built-in circuit consists of a microprocessor 2 and a memory 4, and usually one or two chips are incorporated.

The field of use for IC cards is that their storage capacity is orders of magnitude larger than that of conventional magnetic cards, and that they have arithmetic functions (though some do not). In the financial field, sales and distribution for shopping cards are expected to increase in usage. It is expected that it will be used widely in the transportation field such as toll road payments, insurance, medical purposes, ID cards, etc.

Along with this, various types of data related to personal panties have shifted from being stored in computers to being stored in cards.

(Problems to be Solved by the Invention) However, since the amount of information is large, the damage caused by unauthorized reading or manipulation due to loss or theft is great.

As a precaution, code numbers were used, but they were largely ineffective in preventing the contents from being read.

In addition, pattern recognition of the person's image is desirable as a method for verifying the person's identity, but there are technical problems.

This invention solves the problems of the above-mentioned prior art.
We have resolved the major damage caused when the content is read or manipulated without authorization, the difficulty in preventing the content from being read, and the technical difficulties of the i4 method for the person in question. This provides a method for keeping the confidential contents of an IC plastic card.

(Means for Solving the Problems) The present invention provides a secret content preservation system for IC plastic cards, which includes a secret preservation means for synthesizing codes or bits by combining at least two types of cards.

(Function) According to the present invention, as described above, since the secret content preservation system of the IC plastic card is configured, one card is used as a normal card generally called an IC card, and the other card is used as the former IC card. The above-mentioned problem can be eliminated by making the card function by reading out the information that makes it function.

(Example) Hereinafter, an example of the secret content retention system for an IC plastic card of the present invention will be described based on the drawings. Figure 1 (a), Figure 1 (bl is a plan view of each embodiment, Figure 1 ta+ is the first card,
Show card. This invention provides at least a first card and a second card.
By combining the cards 12, they function as a single card, and the illustrated embodiment illustrates a case in which two cards function as a single card.

First, Figure 1 (Al no Matato Maruba cash card, and Figure 1 (BL 2 is this cash card 1)
It is a card that allows you to function, and in other words, it is a power card that can be called a basic card that acts as a "seal".

In order for this cash card 1 to function, two cards, namely cash card 1 must be inserted into the terminal (not shown).
By loading the card 2 and inputting the conventional code number, operations such as payment can be performed for the first time.

For example, two cards can be handled like a savings passbook and a seal.
Carry or store separately. The card 2 can be used by each card holder as a basic seal card in combination with all other important IC cards.

FIG. 2 shows how to input data into a card according to the present invention. In FIG. 2, the contents of data to be stored are stored in a card writing machine (not shown) in step S1.

Next, in step S2, a card 2 containing a set of meaningless data is created using random numbers or the like.

Next, in step S3, logical operations are performed on the data stored in the card writing machine on the contents of card 2 bit by bit, and the encrypted data is written to card 1, thus completing the writing to card 1 and card 2. .

In this method of creating data on a card, it is also conceivable to divide the data into upper bits and lower bits and store them in two cards.

Next, the card 1. on which the data has been written as described above. To read data on card 2, for example,
Do as shown. First, in step 311, card 1 is
In step 512, the data of card 2 is read.

Next, in step 313, card 1. The read contents of the card 2 are stored in the m area, and a logical operation opposite to that at the time of writing in FIG. 2 is performed to make the data regular.

The work in step 313 may be performed in a machine or may be performed using a processor in an IC card.

Next, in step 314, the data in the regular data type is transferred to the data input section. Next, in step 315, normal processing is performed.

As described above, in this invention, for example, by using two IC cards, the possibility of secret leakage is reduced, and the contents of card 1 cannot be read without the combination of basic card 2. This is what I did.

For example, the contents of card 2 are subtracted (or added) from the data that should be stored in card 1 using a bit-by-bit operation and stored in card 1, and the process 81 subtraction performs the opposite to reproduce the data. It is.

(Effects of the Invention) As explained in detail above, according to the present invention, at least two or more cards made of plastic or the like are used in combination with other cards so that one card alone cannot function. Since we made it work by synthesizing Code Matata 1 Obino I, it became possible to create a card that was both technically and cost-satisfactory and whose meaning would not be understood even if someone else read it. , to maintain safety even in the event of an emergency.

Therefore, it will be especially effective when registering data on the +C card in the future.

[Brief explanation of drawings]

FIG. 1 (al is a plan view of one card of an embodiment of the confidential content preservation system of the IC plastic card of the present invention;
Figure 1 (bl is a plan view of the other card in the confidential content retention system of the above IC plastic card, Figure 2 is a flowchart showing an example of card creation in the confidential content retention system of the same IC plastic card, Figure 3) is the same IC as above
A flowchart showing an example of reading out a card in a plastic card confidential content preservation system.
It is a top view of a C card. 1.2 Cards. 1; Car 1-2: Power - Everyone Fig. 1 Fig. 4 Q Yup Moon's Car■ "n I enter Gobe's foo-'>w-"
r-2nd prisoner 3rd ward

Claims (2)

[Claims] (1) (a) Means for writing predetermined data that does not function on its own into one card using at least two or more types of plastic cards, (b) Writing other predetermined data on the remaining other cards. (c) means for reading out the information of the synthesized code or bits to perform a predetermined function; Confidential content maintenance method. (2) The above-mentioned one card is used as a basic seal card for the card holder, and is combined with other cards so that each combination has a card function.
C. Method for keeping confidential contents of plastic cards.