JPS6048584A - Preventing system of forgery of magnetic card - Google Patents

Abstract

PURPOSE:To assure the security of a program by enciphering and storing a specific code to an ROM and then interpreting this code for execution only in a read or write mode. CONSTITUTION:A specific code containing a program is enciphered and stored to a memory part 1. The part 1 also stores an enciphered interpretation program for interpretation for the enciphered code. When a device starts its actuation, the interpretation program is called by a memory part 2. Then the ciphered code is interpreted by a main control part 3 and executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a+Technical Field of the Invention) The present invention relates to a (dki-1.゛reading-writing device)
Especially regarding the security method of the program of the device.
Ru.

(b) Background of the technology Magnetic cards are used not only for cash handling operations at banks, credit sales of products, and other types of recognition using 10 cards, but also for time records for attendance management.
It is beginning to be used as a human-powered means of 1.

As the use of magnetic carts has become widespread,
It is an important issue to maintain the security of the device that reads and writes data on the magnetic card. This is because, if the 1:1 gram of the device is decoded, it becomes possible to easily convert or counterfeit the gas cart by modifying it.

(C1 Prior Art and Problems) In the conventional magnetic card reading/transforming device, the control block 1: J-gram is stored in a read-only memory (IIOM), and a method is adopted in which this is executed during a read/write operation. In this method, the ROM
The contents of the card were deciphered by reverse analysis, and the internal processing function of the PI:J-gram was revealed.As a result, the magnetic card had the disadvantage that it was easy to change or forge the card.

[d1Object of the Invention] The present invention provides a system that can protect a magnetic card reading/writing device by making it virtually impossible to decode a program by making it impossible to decipher a program. "J"
4-ru with the purpose of J-rugoto.

(c1 Structure of the Invention The present invention is a magnetic card reading/writing device.
Darken the ml-F' (including B1' crumb) of the cost setting! Convert to “ζ1?0” and store it, read it or
, +1 only, translating the particular ml −1; atI!
It is characterized in that it is used for execution.

([)Embodiments of the InventionF'4 Examples of the present invention will be described with reference to the drawings.

Figure 31 shows the function of the magnetic cart reading/writing device 6° incorporating the security system according to the present invention. In the memory +++sl of the J socre 1, a specific :J-l; containing a program is encrypted and stored.

The memory unit 1 also stores a similarly encrypted translation program for translating the encrypted ``2'' code.

The encryption method described in Section 7 is 8-hit instructions':
J-1, middle H, 1-1 are replaced, and a certain value is added to the 8-bit instruction code in a method that does not return to the original state during translation, and the translation l! The method of subtracting the same value from I, or the method of inverting all the bits of the instruction code 1 of 8 hino [・, and inverting all the bits corresponding to 7, Examples include, but are not limited to, these six or two methods.

When the device starts operating, the translation program 1 is first called into the memory section 2, and the encrypted code 1 is translated under the main control section 3. , execution G is used. In this way, using the code (or program) developed in the Q, no seven entry section 2, as in the case of a normal device, ζ, ('t' is read as ki-1・ and the locking operation is performed. In other words, the write data entered from the keyboard 4 or sent via the line control section 5 is written onto the file car 1'7 by the magnetic cart reader/writer 6. Alternatively, the written data on the magnetic card F' 7 is read out by the magnetic card sorter/writer 6 and printed via the printer control section 11, or the read data is sent out via the line control section 5.

In the same figure, 84J is a key/lamp front panel control unit which is an interface with the keys and front panel lamp on the Gypo 1''4, and 9 is a magnetic car 1-- which is an interface with the magnetic cart reader/writer 6. Reader/like controllers 10 and 11 are a printer and a printer controller for reading the magnetic cart or printing a p(-inclusive processing journal), respectively.

FIG. 2 is a conceptual diagram of the translation and execution of the above-mentioned 111f encoded code, and shows that once the encrypted proclado or code is translated into the form of an executable program or an executable code, the main controller A read or write process is performed at 1.

When the contents of the memory section 2 are no longer needed during a read or write process, it is extremely difficult to read and decipher the program stored in the memory Its 2 J2, unless the contents of the memory section 2 are no longer needed. Have difficulty.

- Since the contents of the memory section 1 are encrypted, it is virtually impossible to decipher the successive entries. In this way, the security of the program is guaranteed in the read-and-write device according to the method of the present invention; Counterfeiting is prevented by 95%.

”, the translation of the encrypted code is
/U J, Tei + Katana style Ha, II-Jl i? & mosquito?
+ri Q', TeQ Itamec is suitable for the simple magnetic card reading device W, and this is an illusion゛ζ
The difference from the IJ method in which a trans-nR circuit is installed has the advantage that -1, Gyuri-i is more reliable]. Also, q4 constant -
Instead of converting 1-1.nome to 111, the method G that encrypts the zube ``(coat of 1'' crumb) also creates +2 'i-:j, which becomes the quasi-real. There are ↓ J, Moraron-ζ. Shikakko, Security 4 "II Reward and O/Device:" You can choose the method you have in mind depending on the strike etc.

(8) Results of the Invention According to the present invention, the θ-cart reading and writing device is operated by an unspecified person. It is possible to maintain the security of the magnetic cart and prevent unspecified persons from changing the program and tampering with the magnetic cart.

[Brief explanation of drawings]

Fig. 1 shows the magnetic cart reading and writing device according to the present invention.
Translation 1 of Itsukhufu; This is a conceptual diagram of the scale. Figure 6. 2, ] is the memory part, 2 is the memory part, 3 is -
1 - 11 parts with system, 4 is keyboard, 5 is line control part, (
i i,! Magnetic Car 1 Reader/Writer, 7 &J Magnetic Cart, 8 (, 10-Lamp Table 4<Control Unit, 9 is Magnetic Car 1-Sorter/Writer Control Unit, l, 0 is Printer, 1
1 is the printer system f+llI section. Sumire 10 Pavilion 2

Claims (1)

[Claims] In magnetic cart reading and writing devices, certain two
−1” (including the 1J-gram) and ζllOH
Store it in a file and use it when reading or writing.
A magnetic cart counterfeiting prevention method characterized by translating and using the specific code for execution.