CardCheck is an application for Windows 95/98/NT that verifies credit card numbers to ensure they are genuine.
CardCheck supports:
Visa, MasterCard (Eurocard), Discover, American Express and Diners Club cards.
It performs three functions:
1. It checks the number of digits
Credit cards can have either 13, 14, 15 or 16 digits. CardCheck ensures the right amount of numbers have been supplied for that card type.
2. It checks the leading digit
Each Credit card type has a unique leading digit (or digits). CardCheck ensures the correct initial digit(s) for that card type.
3. It checks the validity of the numbers
All credit cards contain a checksum, which is used to ensure the numbers in the credit card are correct. CardCheck calculates the appropriate checksum for the supplied number and compares it to the expected result to ensure the number structure is valid.
NOTE: CardCheck is NOT foolproof. However it will detect an erroneous card number in at least 90% of cases. CardCheck also only checks the credit card number, it does not check whether it is assigned to the person who has used it or whether the user has sufficient credit.
INSTALLATION
1. Run the self-extracting zip, 'crdchk20.exe'
2. Follow the instructions.
UNINSTALLING CARDCHECK
1. In Windows Explorer select the folder C:\CardCheck. Press delete.
2. In Windows Explorer, browse to the folder C:\Windows\Start Menu\Programs, select the icon 'CardCheck' and press delete.
