JPH0769948B2 - Portable electronic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a portable electronic device of a so-called IC card, which is a multifunctional type used as, for example, a credit card or a cash card.

(Prior Art) Currently, cards with magnetic stripes such as credit cards and cash cards, so-called magnetic cards, are in widespread use, and data consisting of erasable non-volatile memory with newly expanded storage capacity in place of these cards. A so-called IC card, which has an IC chip having a memory and a control element such as a CPU for controlling the memory, has attracted attention. Such an IC card is designed to carry out a transaction with the transaction account information stored in the data memory.

Furthermore, recently, a battery-driven multi-function IC card has been developed, which has a battery built in the card, has a keyboard and a display unit, and operates without being connected to a terminal device or the like.

Now, for example, an IC card used as a credit card is designed to carry out a transaction with the transaction account information stored in the data memory as described above, but at the time of the transaction, the transaction information is stored in the data memory. I am trying. At this time, in order to identify the transaction, the transaction information may be added with date and time information and stored, and the date and time information to be added to this transaction information has conventionally been input from the outside every transaction. It was

However, with such an IC card, the date and time information to be added to the transaction information is input from the outside every transaction, so
For example, if you change the value to correct the error in the date and time information, the date and time on the transaction record will shift, and in the worst case the order of the transaction may be reversed,
The reliability of the stored contents of transaction information is reduced. Also,
There is a possibility that the date and time information will be intentionally changed and used for an illegal purpose, and the reliability of using the IC card is poor.

(Problems to be Solved by the Invention) As described above, since the date information to be added to the transaction information is input from the outside every time the transaction is performed, accurate date information cannot be added to the transaction information. In addition, there is a possibility of unauthorized use, and there is a problem that reliability is poor.

Therefore, an object of the present invention is to provide a portable electronic device capable of adding accurate date information to transaction information, preventing illegal use, and greatly improving reliability. To do.

[Structure of the Invention] (Means for Solving Problems) A portable electronic device of the present invention includes a data memory for storing transaction account information, and a control for reading and writing data from the data memory. A portable electronic device having a section and performing a transaction based on transaction account information stored in the data memory, the display clock means being capable of generating date and time information and externally changing the information. And a display means for displaying the contents of the display clock means, an internal clock means for generating date information and restricted from changing the setting of the date information from the outside, and the internal clock means for the transaction information at the time of transaction. And storing the date information generated from the data memory in the data memory.

(Operation) The display clock means that operates independently from each other and is capable of changing information from the outside and the internal clock means that limits the setting change of date information from the outside are provided. Accurate date information for the transaction information by displaying and outputting the generated date and time information and adding the date information generated by the internal clock means to the transaction information for each transaction and storing it in the data memory. Can be added, and the reliability of the stored contents of transaction information is greatly improved.

Further, since the setting of the internal clock means cannot be easily changed from the outside, the internal clock means will not be deliberately used up for illegal purposes and will not be used for illegal purposes. Significantly improved.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.

FIG. 3 shows an example of a portable electronic device according to the present invention.
For example, a multifunctional type used as a credit card
The external view of the IC card is shown. That is, 1 is a card body, which is made of, for example, a rectangular thin plastic plate. The card body 1 is attached to a predetermined portion of the surface of the card body 1.
It is electrically connected to the integrated circuit (IC) 2 embedded inside,
External device (not shown) (for example, card reader / writer)
There are provided an electrical contact 3 for obtaining electrical contact with the liquid crystal display unit 4 for displaying input / output data and time, and a keyboard 5 for data input. The keyboard 5 is provided with ten keys and function keys. A crystal oscillator 6 and a battery 7 for power supply are embedded in the card body 1.

FIG. 1 shows the circuit configuration of the IC card described above. That is, a control element (control section) 11 such as a CPU is responsible for overall control. The control element 11 is connected to the electrical contacts 3, the liquid crystal display section 4 and the keyboard 5 and receives data. A data memory 12 composed of an erasable non-volatile memory such as an EEPROM for storing, a program memory 13 composed of a mask ROM for storing a control program of the control element 11, a display clock circuit 14, and internal processing. A clock circuit 15 is connected, and among these, a control element 11, a data memory 12, a program memory 1
3, and the clock circuits 14 and 15 are formed as one chip (or a plurality of chips) as the integrated circuit 2, and the integrated circuit 2 is supplied with operating power from the battery 7. The data memory 12 stores transaction account information, expiration date information for determining the expiration date, and the like, and transaction information as described later.

The display clock circuit 14 generates date and time information for displaying date and time by counting the reference clock output from the crystal oscillator 6, and its value can be easily set by operating the keyboard 5. It can be changed. The internal processing clock circuit 15 generates date and time information for internal processing by counting the reference clock output from the crystal oscillator 6, and is specified when the IC card is issued or as described later. The setting of the value cannot be easily changed from the outside except when the correctness of the operation is proved by the procedure of.

In such a configuration, the control element 11 drives the liquid crystal display unit 4 in accordance with the date and time information output from the display clock circuit 14 to display the date and time. Further, the control element 11 determines the expiration date by collating the date information output from the internal processing clock circuit 15 with the expiration date information stored in advance in the data memory 12. If the result of this determination is that the expiration date has not passed (both information does not match), the control element 11 determines, for example, input data from the keyboard 5 and data memory 12
The predetermined transaction processing (credit processing) is performed according to the transaction account information inside, and if the expiration date has passed (both information match), the control element 11 stops (or limits) the transaction processing function.
Excuse me. When the transaction processing is performed, the control element 11 stores the transaction information in the data memory 12. At this time, the control element 11 adds the date and time information output from the internal processing clock circuit 15 to the transaction information and stores it.

In this way, the expiration date is determined by collating the date information output from the internal processing clock circuit 15 with the expiration date information stored in advance in the data memory 12, and then the transaction processing is performed, so that the crystal is used. By using a sufficiently accurate oscillator 6, the transaction processing function can be reliably stopped or restricted after the expiration date.
Further, since the date and time information output from the internal processing clock circuit 15 is added to the transaction information and stored, a crystal oscillator 6 having sufficient accuracy is used, so that the date and time information added to the transaction information can be obtained. The time information is sufficiently reliable and the date and time information will not shift.

The functional configuration of the IC card described above is shown in FIG.

Next, a method of changing the value of the internal processing clock circuit 15 will be described with reference to FIGS. 4 and 5. First,
FIG. 4 shows a case in which the setting of new date and time information can be changed by collating a specially prepared personal identification number different from the personal identification number for identifying the card user. That is, by inputting a special personal identification number from the keyboard 5, the control element 11 compares the input personal identification number with the personal identification number stored in advance in the data memory 12, and if both personal identification numbers match, the keyboard Allow entry of new date and time information from 5. Here, by inputting new date and time information from the keyboard 5, the control element 11 receives the input new date and time information from the internal processing clock circuit 15.
Set to.

FIG. 5 shows the case where the new date and time information and the encryption code for proving their validity are input, and the setting of the new date and time information can be changed only when the collation is correctly performed. Shows. That is,
While inputting new date and time information from the keyboard 5, the date and time information is encrypted by a predetermined algorithm to generate an encryption code, and this encryption code is input from the keyboard 5.
Then, the control element 11 decrypts the input encryption code, compares the decrypted value with the input new date and time information, and if both match, the input new date and time information is output. It is set in the internal processing clock circuit 15.

In this way, the internal processing clock circuit and the display clock circuit that operate independently are provided, and the value of the internal processing clock circuit can be changed only when the card is issued or in a specific procedure. By determining the expiration date using the value of the clock circuit for internal processing, the reliability of the determination can be improved and unauthorized use can be prevented, and after the expiration date the card function is automatically Can be stopped or controlled automatically. Furthermore, by adding the value of the internal processing clock circuit to the transaction information, it becomes possible to add accurate date and time information to the transaction information, and the reliability of the stored content of the transaction information is greatly improved. At the same time, the date and time information will not be deliberately deviated to be used for illegal purposes, and the reliability in using the IC card will be greatly improved.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to add accurate date information to transaction information, prevent unauthorized use, and greatly improve reliability. Possible electronic device can be provided.

[Brief description of drawings]

1 is a block diagram showing a circuit configuration of an IC card, FIG. 2 is a functional configuration diagram of the IC card, and FIG. 3 is an external view of the IC card. The perspective views shown in FIGS. 4 and 5 are flowcharts for explaining the procedure for changing the setting of the value of the internal processing clock circuit. 2 ... Integrated circuit, 3 ... Electrical contact, 4 ... Liquid crystal display section, 5 ... Keyboard, 6 ... Crystal oscillator, 7 ... Battery, 11 ... Control element (control section), 12 ... Data memory, 13 ... program memory, 14 ... display clock circuit (display clock means), 15 ... internal processing clock circuit (internal clock means).

Claims (3)

[Claims] 1. A data memory for storing transaction account information,
A portable electronic device that has a control unit for reading and writing data to and from this data memory and that conducts a transaction based on transaction account information stored in the data memory. Occurred, display clock means capable of externally changing the information, display means for displaying the contents of the display clock means, date information is generated, and external setting change of the date information is restricted. A portable electronic device comprising: internal clock means; and means for adding transaction date information generated by the internal clock means to the transaction information and storing the transaction information in the data memory. 2. The date information of the internal clock means can be set and changed only when the correctness of the operation is proved by a specific procedure.
A portable electronic device according to the paragraph. 3. The portable electronic device according to claim 2, wherein the specific procedure is matching of a personal identification number.