JPH06215204A - Rationality checking system for credit card number - Google Patents

Abstract

PURPOSE:To optionally update rationality checking logic for each credit card issuing source by an international exchange through a man/machine interface. CONSTITUTION:An issuing source identification(ID) number registering table 1 registers and stores credit card numbers and their issuing source number in each credit card issuing source. A logical number registering part 2 registers a logical number for regulating the rationality of a credit card number in each issuing source number regulated by converting the issuing source number into a normalized number. A rationality checking table 3 executes logic judgement corresponding to the logical number and outputs a judged result. An updating processing part 4 updates the contents of the table 1 by the maintenance man's operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a credit card number reasonableness check system, and more particularly to a credit number reasonableness check system in an international exchange.

[0002]

2. Description of the Related Art Conventionally, a credit card number rationality check system in an international exchange has, in principle, targeted only a credit card number of the home country. Therefore, it was not necessary to consider multiple rational checking logics.

[0003]

In this conventional credit card number rationality check method, since only the credit card number of the home country is considered, the rationality check of the credit card numbers of other countries cannot be performed.

Further, there is a problem that the complicated check logic cannot be freely updated by the operation of the maintenance person, and even if a new check logic is requested, it cannot be easily dealt with.

[0005]

According to the rationality check method of a credit card number of the present invention, the rationality check logic is decomposed by allowing each credit card issuer to have a different rationality check logic for each credit card number. And expressed by a simple combination of logics, and the logics are updated by a man-machine interface.

Storage means for registering and storing the credit card number for each issuing source, issuing source number normalizing means for converting the issuing source number into a normalized number, and each normalized issuing source number It is characterized by further comprising registration means for registering a logical number that defines the rationality of the credit card number, and logical judgment processing means for making a logical judgment corresponding to the logical number.

Further, the present invention is characterized by comprising update processing means for updating the contents of the storage means by the operation of a maintenance person.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a rationality check system of a credit card number according to the present invention, and FIG. 2 is a flow chart for explaining the operation of the logic judgment processing section in FIG.

In this embodiment, as shown in FIG. 1, an issuer identification number registration table 1 for registering and storing a credit card number and an issuer number for each issuer of a credit card, and an issuer number as a normalized number. A logical number registration unit 2 that registers a logical number that defines the rationality of the credit card number that is converted and normalized for each issuer number, and a rationality check that performs a logical determination corresponding to the logical number and outputs the determination result. Table 3
The update processing unit 4 updates the contents of the issuer identification number registration table 1 by the operation of the maintenance person.

Next, the operation of this embodiment will be described with reference to FIG.

First, 7 from the beginning of the credit card number.
Issuer identification number (Issuer Ide)
registration number: hereinafter referred to as IIN) The registration table 1 is searched (step 101) to check whether there is a match (step 102).

In the IIN registration table 1, a credit card number and an issuer number for each issuer are registered in advance by a maintenance person through a man-machine interface.

If there is a match in step 102 (Yes), the logical number registration unit 2 converts the issuer normalized number according to the position in the IIN registration table 1 to the normalized issuer number and credit card. Register the logical number that defines the rationality of the number in the rationality check table 3.

Next, the rationality check table 3 corresponding to the issuer normalized number is taken out (step 103). In the rationality check table 3, the rationality check logical number applied to the issuer number is the operation code (Operation).
It is registered in advance by a maintenance person in a combination of Code: OC).

Then, the index value of the rationality check table 3 is initialized (step 104), and the OC and the data code (Data Code:
(Hereinafter referred to as DC) is taken out (step 105).

The OC instructs calculation (addition, subtraction, multiplication, division), extraction of a number, collation of a check digit (hereinafter referred to as CD), and the like. DC is additional information of OC.

When branching at OC (step 106) and OC = a (check end) according to the logical number in the rationality check table 3, the result NG is output as NO at step 102 (step 107) and END ( Step 108) is performed.

When OC is branched at step 106,
If C = b (calculation), calculation processing corresponding to each OC is performed (step 109). For example, OC indicates “multiplication” and DG “3” means “multiply 3”.

If OC = c (CD collation), then C
The D table is taken out (step 110), the key digit (hereinafter referred to as KD) and the CD are collated and the result is output (step 111).

Then, when the arithmetic processing is completed in step 104 and the result output is completed in step 111, the index of the rationality check table 3 is updated and the operation proceeds to the next OC (step 114). Repeat the flow.

The above is the general logic judgment processing flow.

Next, AT &T's Luhn Formul
A process of registering a complicated check logic such as a will be described.

First, the Luhn Formula itself has 1
Give one logical number. Then, this check logic is finely decomposed, converted into a logical number, and expressed by OC and DC,
In addition to the check table corresponding to the issuer number, it is registered as a check table corresponding to the special logical number (in this case, the logical number assigned to the entire Luhn Formula).

Next, the logical judgment processing flow of the special logical number will be described.

At step 105, OC and D are checked from the check table.
When C is taken out and branched at OC (step 10
6) If OC = d (special OC), the check table corresponding to this special OC is referred to (step 112), the index is updated, and the operation proceeds to the next OC (step 114).

If OC = e (end of special OC) when branched at OC, the process returns to the IIN compatible check table (step 113).

[0028]

As described above, the rationality check method of the credit card number of the present invention has the rationality check logic for each IIN. Therefore, not only the credit card number of the home country but also credits of any country. This has the effect of enabling a reasonableness check of the card number.

Further, by dividing the rationality check logic into simple and fine elements and expressing them as logical numbers,
A complicated rational check can be realized by combining the logical numbers, and even if a new rational check is required in the future, it can be easily realized by adding a simple operation code.

Furthermore, by converting the rationality check table including the CD correspondence table into a man-machine interface, a maintenance person can freely assemble and update the rationality check logic.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a rationality check system for credit card numbers.

FIG. 2 is a flowchart for explaining the operation of a logic judgment processing section in FIG.

[Explanation of symbols]

 1 Issuer identification number registration table (IIN registration table) 2 Logical number registration section 3 Rationality check table 4 Update processing section

Claims (3)

[Claims] 1. A credit card number is provided with different rationality check logic for each credit card issuer,
A rationality check method of a credit card number, characterized in that the rationality check logic is decomposed and expressed by a combination of simple logics, and the logic is updated by a man-machine interface. 2. Storage means for registering and storing the credit card number for each issuer, issuer number normalizing means for converting the issuer number into a normalized number, and for each normalized issuer number 2. The rational credit card number according to claim 1, further comprising: a registration unit that registers a logical number that defines the rationality of the credit card number, and a logical judgment processing unit that makes a logical judgment corresponding to the logical number. Sex check method. 3. The credit card number reasonableness checking system according to claim 2, further comprising update processing means for updating the contents of said storage means by an operation of a maintenance person.