JPH02217983A - Ic card - Google Patents

Abstract

PURPOSE:To improve safety by independently storing secret data collating means in addition to a secret data unit. CONSTITUTION:An IC card is constituted of an 1-chip 8-bit CPU 1 having a collating means 2 and a transmitting/receiving means 3, a collating data storing means 4 and a card acceptable device(CAD) 5 and the secret data collating means is made secret in addition to the secret data. Namely, the character string of the secret data is divided into plural parts and the reception of the secret data is divided into plural times to collate the secret data. Consequently, high safeness can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an IC card, and more particularly to an IC card equipped with means for verifying confidential data used to permit fortune-telling of an IC card.

Conventional technology Conventionally, in IC cards with a built-in CPU,
Before reading or writing a C card, confidential data is verified, and if the verification result is normal, reading and writing to the IC card is permitted, but if the verification result is abnormal, reading and writing to the IC card is not permitted. There is.

Problems to be Solved by the Invention Problems with conventional IC cards include: 1. Because the means for collating confidential data is the same system as other normal reading/writing means, once the confidential data is revealed, it is easy to collate the confidential data. Sometimes I put it away.

The security that relied solely on confidential data was far less secure than the current magnetic card system, which relies on PIN numbers.

Means for Solving the Problems In contrast to the conventional method that relies only on confidential data, the present invention provides at least a means for transmitting and receiving data, a means for storing data for verification, and a means for storing data for verification and confidential data received from the outside. Use of a 1C card characterized in that the confidential data is verified by dividing the character string of the confidential data into a plurality of pieces in an IC card having a verification means and receiving the confidential data in multiple parts. This aims to ensure higher safety.

Operation The present invention improves security by keeping secret data as well as the means for collating confidential data.

Specifically, confidential data is divided into multiple pieces. The division method is determined by the number of divisions of confidential data and the number of characters to be divided. This means of partitioning can be stored separately from sensitive data. Next, the confidential data divided into multiple pieces can be received multiple times. The above-mentioned dividing means and receiving the data in multiple parts together serve as means for collating confidential data.

There are two ways to divide confidential data, assuming the length of confidential data is n bytes.

If it is n-32 bytes, there are approximately 2:109 ways.

The length of the confidential data can be increased as needed, so even if the confidential data is revealed, security can be ensured by keeping the means of collating the confidential data secret.

When the IC card receives the divided confidential data, the reception is performed a number of times according to the number of six divisions. At that time, even if the IC card receives the divided pieces of confidential data, it will return an abnormal response7.By returning a normal response only when all the confidential data is finally collected, it is possible for another person to It becomes difficult to read and write IC cards. For the same reason, if we make the IC card send back an abnormal response even when all the confidential data is finally collected, and then send back a normal response only after a predetermined number of repetitions,
Furthermore, deciphering by others can be excluded.

For example, if the people who store confidential data are separated from the people who store the verification means for confidential pigs, crimes committed by insiders can be suppressed. moreover.

A means of collating confidential data that is different from the normal reading and writing system, in which confidential data is not received once, but divided into multiple times! : By doing so, crimes committed by outsiders can be suppressed.

Example FIG. 1 shows an embodiment of an IC card according to the present invention.

As an IC card, a 1-chip 8-bit CPIJ1 with internal ROM of 4 bytes and internal RAM of 128 bits is used.
Connected PROM. The CPU 1 uses the serial I/"'0 part as the transmitting/receiving means 3.

In this embodiment, the collation means 2 was programmed in the internal ROM of No. 111 in advance. As another example, the verification means 2 can also be programmed into an EEPROM used as the storage means 4.

When using this IC card, confidential data is first set during initialization. A 32-byte character string was used as the confidential data. Confidential data is as follows: 5 Confidential data knee = 123456789012345 In this case, it is also desirable to divide 1 confidential data. The division is performed as follows. / indicates division.

Divided confidential data 12/3458/'7/8901
2345/678/9012345678/9012 In this example, it is divided into seven parts. One stage divided into seven can be written as two data, and can be stored in the collation means 2 or the storage means 4. If we express Nagara of each divided piece in order.

Divided data=24183mm4 (A=10).

To transmit confidential data, a start code, block length, command code, check code, etc. are attached to each confidential data piece, and the data is transmitted from the card acceptor device (hereinafter referred to as CAD) 5 side to the IC card. I
The C card receives the confidential data a number of times corresponding to the divided number (7) using the transmitting/receiving means 3, and then stores the confidential data in the storage means 4.
Registration of confidential data will be completed within This procedure follows the procedure stored in the matching means 2 in advance.

Next, the data is written into the storage means 4 to complete the initial setting of the IC card.

When rewriting data in the storage means 4 of the IC card, confidential data is first verified. In the present invention, using confidential data divided into two in the same way as when registering confidential data,
The C card receives confidential data in 7 parts. If the division and confidential data are as registered, the data in the IC card can be changed.

When reading data in an IC card or changing fortunes on data that is not particularly important, the function of conventional IC cards is to use verification of secret data other than the confidential data referred to in the present invention. Can be used by matching,
Only more sensitive data can be protected by the present invention.

Effects of the Invention According to the present invention, in addition to conventional confidential data alone, collation means for one confidential data can be stored independently, thereby increasing security against data exchange and repurchase. If you layer the key parts of confidential data and secret data,
In addition to the functions of conventional IC cards, data can be recorded with a higher degree of security. 3

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of an IC card according to the present invention. 1. 1-chip 8-bit CPU, 2... Verification means, 3... Transmission/reception means, 4... Storage means,
6...CAD.

Claims (1)

[Claims] In an IC card having at least a means for transmitting and receiving data, a means for storing data for comparison, and a means for comparing the data for comparison with confidential data received from the outside, a character string of confidential data is divided into a plurality of pieces. An IC card characterized in that confidential data is verified by receiving the confidential data in multiple parts.