JPH0247029B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a data reading method for reading data from a medium such as a magnetic card.

(b) Prior Art and Problems Magnetic cards are widely used as data storage media, and the data includes important data such as password codes. For example, in an automatic transaction system or POS system in a financial institution, data on a cash card (magnetic card) presented by a user is read by a reader and stored in an input buffer. Thereafter, the data in this input buffer is sent to a processing section and subjected to necessary processing. However, the data in the input buffer remains as it is until data from the next magnetic card is read.
Since this data includes important data such as a password (top secret to third parties), conventional data reading methods have the drawback of not being able to maintain the confidentiality of this important data.

(c) Purpose of the Invention The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to provide a data reading method that facilitates the confidentiality of input data.

(d) Structure of the Invention The present invention provides a reading device that reads data from a storage medium by a reading unit and stores the read data in a buffer memory, which includes mask pattern data for removing predetermined data in the storage medium; means for processing data in the storage medium based on mask pattern data, when the data in the storage medium is read by the reading section, processing the read data based on the mask pattern data; This data reading method is characterized in that the processed data is stored in the buffer memory. As described above, when reading data recorded on a storage medium such as a magnetic card, the present invention masks important data such as a PIN number using a mask pattern prepared in advance. It was designed so that it would not be stored.

(e) Examples of the invention The present invention will be explained below with reference to the drawings. FIG. 1 is a data block diagram illustrating one embodiment of the present invention. Note that the embodiment is an example of a cash card. A data CD shown in FIG. 1a is stored in the storage section of the cash card. In other words, the data section _D1 stores the password A and other data _d1 , the data section _D2 stores the company code B and the account number N, and the data section _D3 stores other data _d3 . There is. In the conventional reading method, the data read from the cash card (data part)
D ₁ , D ₂ and D ₃ ) were all stored in the input buffer. In the present invention, FIG.
Mask pattern data MK shown in is prepared in advance. The mask data _M1 in FIG. 1b is data for masking the data section _D1 in FIG. 1a,
On the other hand, the mask data M ₃ is the data section D ₃ in FIG.
This is the data that masks the Therefore, when the reading unit reads the data CD shown in FIG.
If masking is performed using the mask pattern data MK shown in FIG. _1B , only the data shown in FIG. Therefore, since important data such as the password A is not stored in the input buffer, its confidentiality can be maintained.

FIG. 2 is a block diagram illustrating one embodiment of the present invention. The data CD shown in FIG. 1a is stored in the cash card 1 in FIG. 2 in units of bytes B ₁
~ Recorded in Bn. Therefore, the mask pattern data MK in the memory 2 is also prepared as mask data m ₁ , m ₂ . . . in byte units. In FIG. 2, when the cash card 1 is inserted into the reading section 3,
The reading unit 3 reads one data CD in the cash card.
Read byte by byte. First byte data B ₁
When the byte data B1 is read into the register 4, the processing section 5 causes the checking section 6 to perform a parity check on the read byte data _B1 . When the check result is normal, the processing section 5 takes out the mask pattern data _m1 using the pointer PM. Next, the calculation unit 7 performs a masking process on the read byte data _B1 using the mask pattern data _m1 , and then
Input the obtained data B ₁ ' to the address of buffer 8.
Store in a ₁ . This storage is performed by address selection using pointer PI. Note that the pointer
The contents of PI and PM are as follows each time the above processing is performed.
Assume that the content is incremented by +1. Furthermore, in the above masking process, whether the read byte data B ₁ and the mask pattern data m ₁ are ORed or ANDed depends on the setting conditions of the mask pattern data MK. Furthermore, the masking process may include arithmetic processing.

Data CD in the above-mentioned cash card 1, B ₁ ~
After the above masking process is applied to Bn,
It is stored in the input buffer 8. After the reading is completed, the processing section 5 transfers the data B ₁ ', B ₂ ', . . . in the input buffer 8 to the processing section 9. The processing unit 9 has a main memory 10
The processing program 11 is activated to process the data B ₁ ', B ₂ ', . . . from the input buffer 8.

FIG. 3 is a flowchart showing the procedure of the data reading and masking processing described above.

(f) Effects of the Invention As described above, the present invention has means for performing masking processing on the read data and storing it in the input buffer when reading data in a storage medium such as a magnetic card. It has the advantage of maintaining the confidentiality of important data recorded in

[Brief explanation of the drawing]

FIG. 1 is a data block diagram explaining one embodiment of the present invention, FIG. 2 is a block diagram explaining one embodiment of the present invention, and FIG. 3 is a flowchart explaining one embodiment of the present invention. , the symbols used in the figure are as follows. 1 is a cash card, 2 is a memory, 3 is a reading section, 4 is a register, 5 and 9 are processing sections, 6 is a check section, 7 is an arithmetic section, 8 is an input buffer, 10 is a main memory, 11 is a processing program, A is the pin code, B ₁ , B ₂ , Bn are the data in bytes, B ₁ ′,
B ₂ ′ is masked data, C is company code, CD
is data, D ₁ , D ₂ , D ₃ are data parts, d ₁ , d ₃ are data, MK is mask pattern data, M ₁ , M ₃ ,
m ₁ and m ₂ are mask data, N is account number, PI,
PM indicates a pointer, and a ₁ and a ₂ indicate the address of the input buffer 8.

Claims (1)

[Claims] 1 Read the data on the storage medium by the reading unit,
A reading device that stores read data in a buffer memory, comprising mask pattern data for removing predetermined data in the storage medium, and means for masking the predetermined data read from the storage medium based on the mask pattern data. When the data of the storage medium is read by the reading unit, predetermined data of the read data is masked based on the mask pattern data, and the read data including the masked data is processed by the mask pattern data. A data reading method characterized by storing data in buffer memory.