Luhn algorithm implementation on

Android in Credit Card Authentication

Introduction

Algorithm

Schema

Example

Check Digit

Output

Conclusion

INTRODUCTION

Background:

Credit card has been used in many transaction

Luhn Algorithm is simple and powerful

Android is complete platform

Scope :

Authenticity for credit card that use Luhn algorithm to calculate the digits of credit card

Applications built on the Android version 1.5

Goal :

Implement the Luhn algorithm into a credit card authentication in Android

INTRODUCTION

1. Card issuer, the name

of the bank as a credit

card issuer.

2. Credit card

number, amounting

to 16 digits.

3. Member since,

month and year of

customers that credit

card holders.

4. Name of credit card

holders,

5. Expiry date,

month and year of

valid credit card.

6. Logo credit

card network.

MII (Major Industry Indentifier)

The first digit of a credit card number is the Major

Industry Identifier (MII), which represents a

category of companies that issue credit cards.

MII represent different categories.

MII Digit Value Issuer Category

0 ISO/TC 68 and other industry assignments

1 Airlines

2 Airlines and other industry assignments

3 Travel and entertainment

4 Banking and financial

5 Banking and financial

6 Merchandizing and banking

7 Petroleum

8 Telecommunications and other industry assignments

9 National assignment

MII (Major Industry Indentifier)

IIN (Issuer Identifier Number)

Issuer Identifier Card Number Length

Diner's Club/Carte Blanche300xxx-305xxx,

36xxxx, 38xxxx14

American Express 34xxxx, 37xxxx 15

VISA 4xxxxx 13, 16

MasterCard 51xxxx-55xxxx 16

Discover 6011xx 16

Account Number

Digits to 7 (seven) up to (n - 1) of the credit cardnumber is a unique account number.

Maximum length of a credit card number is 16digits. Because of 6 (six) first digit is theidentifier number and the last digit is the checkdigit, means the maximum length of the accountnumber is 12 digits.

So, there are 1012 or 1,000,000,000,000possible account numbers.

Check Digits

The last digit of a credit card number is the

check digit. Digits are used to check the

validity of card numbers. The algorithm

most commonly used to check the credit

card number is the Luhn algorithm.

LUHN ALGORITHM SCHEMA

Step 1:

Multiply the odd

digit with 2, if the

result> 9 subtract

9, sum the odd

digits

Step 2:

Sum the Even

Digits

Step 3:

Sum the step 1&2,

If the Result mod

10= 0 (valid), If the

Result mod 10≠ 0

(invalid)

EXAMPLE CHECK DIGIT

7889 8594 5435 5413

5+8+7+9+7+5+9+4+1+4+6+5+1+4+2+3= 80

80 mod 10 = 0

valid

7 8 8 9 8 5 9 4 5 4 3 5 5 4 1 3

7x2

=14

8 8x2=

16

9 8x2

=16

5 9x2

=18

4 5x2=

10

4 3x2

=6

5 5x2=

10

4 1x2

=2

3

14-

9=5

8 16-

9=7

9 16-

9=7

5 18-

9=9

4 10-

9=1

4 6 5 10-

9=1

4 2 3

5 8 7 9 7 5 9 4 1 4 6 5 1 4 2 3

SYSTEM DESIGN

Usecase Diagram

OUTPUT

OUTPUT

CONCLUSION

Credit cards can be said to have been valid ifthe requirement of Luhn algorithm that the endof the result is divisible by 10 (mod 10 = 0)

Luhn algorithm implementation is used as ageneral knowledge and the first step inpreventing a crime to use credit cards

Luhn algorithm implementation can be run onAndroid, so can be used anywhere withoutinterfering the user mobility

THANK YOULuhn algorithm implementation on Android in credit card authentication

Lintang-Nurhayati-Yunufa © Gunadarma University