JPS60207940A - Protecting system of portable recording medium - Google Patents

Abstract

PURPOSE:To prevent an IC card from illegal access by confirming a user or a device allowed to access the card on the card side by using a random number or the like in each access of the card. CONSTITUTION:The same secret program is formed in the IC card 12 and an IC card reading/writing device 28, random numbers are generated from the IC card 12 and the secret program is executed in both the IC card 12 and the IC card reading/writing device 28. The executed results are compared in the IC card 12, and when both the results coincide with each other, correctness of the IC card reading/writing device 28 is decided and the permission of access to the IC card 12 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to, for example, a microcomputer, a memory, etc., to a 5lllIc (jJ nuclear circuit) card, and particularly relates to a protection system for the contents stored in this card.

[Technical background of the invention and its problems]

Currently, in this type of portable storage medium, the card user's PIN code is stored in the storage area of the card, and this PIN code and the PIN code presented by the card user are stored in a device separate from the card. Through verification, it is determined whether or not the card user is the principal, and if the card user is the principal, access to the card is permitted. However, with this method, access to the card is granted only by checking the PIN code, so a person who knows the PIN code can use a fake device to access the card's memory contents (e.g. bank balance, etc.). It has the disadvantage that if you try to rewrite it, you can do it easily.

[Purpose of the invention]

This invention was made based on the above circumstances, and its purpose is to provide a protection system for portable recording media that can prevent unauthorized access to the recording media. be.

[Summary of the Invention] This invention uses, for example, a random number or the like, number 16, which is different each time the card is accessed, to confirm the person or device that can access the card on the card side.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a terminal device installed in a bank or company. A CPU (Central Processing Unit) 2 controls the entire terminal equipment, and this CPU 21 has a ROM (IJ-only memory) 22 in which a control program is stored, and a δd memory in which necessary information is stored. RAM (Random Access Memory)
23 are connected. The CPU 21 also includes a keyboard 24 for inputting required information, and a CRT (
a cathode ray tube) display device 25, a printer device 26 that prints out information, a floppy disk device 27 that stores information,
Interface section 29 of IC card reading/writing device 28
, and an interface unit 32 of a modem 3 connected to a telephone 30j. The IC card reading/writing device 28 reads and writes information to and from the IC card 12 inserted through the card slot 28.

Further, the modem 31 modulates the information output from the CPU 21 and supplies it to the telephone line 13 via the telephone 3o, and also transmits the information sent via the telephone line 13 and the IR telephone 30. The signal is demodulated and supplied to the CPU 21.

On the other hand, the third one shows the configuration of the IC card 12. The CPU 33, which is a microcomputer, has a FROM (programmable read/write memory) that stores a control program, a secret program, a password known to the IC card holder, and a card identification number consisting of a manufacturer number and an issuer number. A RAM 35 is provided for storing information such as a memory (only memory) 34 and a RAM 35 for storing results, results, etc., and is connected to a connection section (not shown) provided inside the IC card reading device lt, 2B. A comparing section 38 is provided to compare the top # result and the performance result of the IC card reading/writing device 28. 〆1■ The random number generation unit 37 uses, for example, the date of the day supplied to the initial A1 and the 11. of the card. The number 6 is generated from the number ■, and the relationship between the random number generation function Rnd and the generated random number R is R = Rnd (D, I), and the output random number R can be changed depending on the date. It is now possible to do so. 1 Tsukasa, when starting to use this 84-sun (ma) seabed device 11, input from the keyboard] J24,
This is supplied to the IC card 12 via the CPU 21 and the like.

On the other hand, FIG. 4 shows the IC card reading and inserting device 28. As shown in FIG. For example, C consisting of a microcomputer, etc.
The PU 41 stores a DIJ control program that controls the entire operation of the device 28, a secret program that is the same as that stored in the IC card 12, a ROM 42 that stores the card's identification number, etc., and stores calculation results, etc. RAM 43, an interface section 44 that exchanges data with the interface section 29, and the IC card 12.
A connector portion 45 is provided which is electrically and mechanically connected to the connector s36.

In the above configuration, the operation will be explained. When the IC card 2 is inserted into the IC card reading/writing device 28 and the connector parts 36 and 45 of both are connected, a random number is generated in the random number generating part 37 of the IC card 12 in step S, as shown in No. 51. be done. This generated i! i1. The number R is C
It is supplied to the PU 33 and is also supplied to the IC card reading/writing device 28 via the connector @36.45 in step S.
4 CPUs are supplied. In step S, in the CPU 33, the supplied random number R and PROM
Using the stored card identification number 34#, the calculation P=f(R,I) is performed in a secret program, and the calculation result P is supplied to the comparison section 38. Further, in step S4, the CPU 42
Using the supplied random number R and the card identification number stored in the ROM 4.2, a secret program performs the calculation P'=f (R, I). This calculation result P' is obtained at step Ss.
TeI C'jJ-f' 12 comparison aIi38 j
ko'IJ'-D. In step $6, compare Q38i
Here, the input calculation results P and P' are compared. As a result, if the two match, it is determined that the IC card reading/writing device 28 is correct, and step Sγ
Access permission to a predetermined storage area of the IC card 12 is issued. In addition, as a result of the comparison in step S6, if the two do not match, the IC card gun retrieval device has two
It was determined that the validity of 8 was questionable, and the IC card 124
Access permissions for this are not output.

According to the above embodiment, the same secret program is provided in the IC card 12 and the IC card insertion device 28, a random number is generated in the IC card 12, and the random number is used to connect the IC card 12 and the IC card. The Matsurai program is executed on both of the reading/writing devices 28, and the execution results are checked inside the IC card 12. If they match, it is determined that the IC card loading device 28 is correct; IC
Access permission to the card 12 is granted. Therefore, if someone tries to illegally access the IC card 2, the IC card reading/writing device 28 or the IC card 1
IS cannot be activated without decoding the 21 secret programs stored in the system, so there is only one chance of cheating, and the fraud prevention effect is well known.

Same as above, Tue I! In 8reli, IC card reading/writing device 2
The parameter of the operation g performed in 8 was only one Seibetsu inspector, and it was capable of processing only for cards of 5 loa, but the ROM 42 has a
, -1n in list form, tM 6 k
Processing can be performed on A's card. In this case, when a random number is supplied to the CPU 4 J, P'l;r(R,t, )+P't=f
The calculation (R, It)-P'n=f (R, In) is performed, and the results of these calculations pl, *P't...P'
. is primarily supplied to the IC card 12. In the IC card 12, the calculation result P in the card and the supplied performance JT results P',, P',..., p/, are Ill! are specified as follows, and access permission is granted only to cards that match.

Such a configuration would be useful, for example, if a user in 2013 uses four different banks, or if a user who owns a card from a different bank uses a card from a bank different from the bank in 1. Combined effect (15 Ru.

In addition, in the above embodiment, a random number was generated in the IC card 12, and a predetermined calculation was performed using this random number.
It is also possible to use data etc. that have been updated in this way.iiJν
It's 1 hit.

Furthermore, the functions of the disturbance data generation capital 37 and comparison section 38 are changed to CP.
U3,? , FROM 34 , RAt4 ,
? It is also possible to use 5 as a substitute.

In addition, it is of course possible to make various modifications within the range of α without changing the main points of the present invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a protection system for a portable recording medium that can prevent unauthorized access to the recording medium.

[Brief explanation of the drawing]

The drawings show an embodiment of the trial recording medium for the iA band according to the present invention, and Fig. 51!1 is an oblique overview showing an example of a terminal device, and Fig. 2 is a block diagram showing the configuration of Fig. 1. ,
Figure 3 is a block diagram showing the configuration of the IC card, and Figure 4 is a block diagram showing the configuration of the IC card. FIG. 5 is a flowchart shown to explain the operation. 11... Edge circle device noodles 1, 121c card, 28...
・Ic card IC import H+t, 33, 41-CPU
. 34...PROM, 35.43...RAM, 37
...Random number name ↑5R138...To comparison sound 1, 42.
...ROD, i. Issuing person's agent Takehiko Suzue Figure 2 Figure Bv Figure 1000 Figure 5 Procedural amendment 1982 5. 91'' Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case, Patent Application No. 36, 1981-63, 2, Protection system for recording media for carrying the name of the invention 3, Relationship with the person making the amendment, Patent applicant α Power Toshiba Corporation 4, Agent

Claims (1)

[Claims] 1) In a device that uses a portable recording medium having an arithmetic unit and a storage unit, a generating means that is provided in the portable recording medium and generates a signal that changes each time the medium is accessed. a first calculation means that performs a predetermined calculation using at least a signal outputted by this means; and a nest 2 provided outside the portable recording medium that performs the same calculation as described above using at least a signal outputted from the generation means. collate the calculation means with the ytn results of the first calculation means and the second calculation means provided in the portable recording medium, and if they match, allow access to the portable storage memory. A protection method for a portable recording medium, characterized by comprising means. 2)...Article 1-A1. 2. The portable recording medium protection system according to claim 1, wherein the second calculation means performs a predetermined calculation based on the output signal of the generation means and the pupil-specific number of the recording medium. 3) The portable recording medium according to claim 1, wherein the second calculating means performs predetermined calculations on the output signal of the generating means and a plurality of shoe-specific symbols of the recording medium, respectively. protection method. 4) A storage method for a portable recording medium according to any one of claims 1 to 3, wherein the generating means is a random number generating means. 5) The storage system for a portable recording medium according to claim No. IJf, characterized in that the @ calculation section and the storage section are made of a semiconductor-built 4λ circuit.