Credit Card Number Crack

Program for credit card number validation Write a program that prompts the user to enter a credit card number as a long integer and Display whether that card is valid or invalid. Credit card numbers follow certain patterns.

Write a program that prompts the user to enter a credit card number as a long integer and Display whether that card is valid or invalid.

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  2. Noone at the bank has access to your CVV number, and they have instructions not to reveal your full credit card number unless you are physically present and have verified your identity. You can, however, get a new card and CVV number by contacting the credit card issuer and requesting a new card because you lost the old one.
  3. Dec 05, 2016  In what amounts to a very clever brute force attack, a group of researchers has figured out how to find credit card information – including expiration dates and CVV numbers – by querying.
  4. Hi i need free credit card number and ccv. My e-mail is: jorma.oinonen@suomi24.fi thanks. U are best Reply. Manalese_23 says: Mar 10, 2012.

Credit card numbers follow certain patterns.
A credit card number must have between 13 and 16 digits. It must start with:

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  • 4 for Visa cards
  • 5 for Master cards
  • 37 for American Express cards
  • 6 for Discover cards

The problem can be solved by using Luhn algorithm.
Luhn check or the Mod 10 check, which can be described as follows (for illustration,
consider the card number 4388576018402626):

Credit Card Number Crack

Step 1. Double every second digit from right to left. If doubling of a digit results in a
two-digit number, add up the two digits to get a single-digit number (like for 12:1+2, 18=1+8).

Step 2. Now add all single-digit numbers from Step 1.
4 + 4 + 8 + 2 + 3 + 1 + 7 + 8 = 37

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Step 3. Add all digits in the odd places from right to left in the card number.
6 + 6 + 0 + 8 + 0 + 7 + 8 + 3 = 38

Step 4. Sum the results from Step 2 and Step 3.
37 + 38 = 75

Step 5. If the result from Step 4 is divisible by 10, the card number is valid; otherwise, it is invalid.
Examples :

Java

// card is valid or not.
// Main Method
{
(isValid(number) ? 'valid': 'invalid'));
publicstaticbooleanisValid(longnumber)
return(getSize(number) >= 13&&
(prefixMatched(number, 4)
prefixMatched(number, 37)
((sumOfDoubleEvenPlace(number) +
}
// Get the result from Step 2
{
String num = number + ';
sum += getDigit(Integer.parseInt(num.charAt(i) + ') * 2);
returnsum;
// Return this number if it is a single digit, otherwise,
publicstaticintgetDigit(intnumber)
if(number < 9)
returnnumber / 10+ number % 10;
publicstaticintsumOfOddPlace(longnumber)
intsum = 0;
for(inti = getSize(number) - 1; i >= 0; i -= 2)
returnsum;
// Return true if the digit d is a prefix for number
publicstaticbooleanprefixMatched(longnumber, intd)
returngetPrefix(number, getSize(d)) d;
publicstaticintgetSize(longd)
String num = d + ';
}
// Return the first k number of digits from
// is less than k, return number.
{
String num = number + ';
}
}

C#

Credit Card Numbers Track 1 And Track 2

// credit card is valid or not.
publicstaticvoidMain()
longnumber = 5196081888500645L;
(isValid(number) ?
}
// Return true if the card number is valid
{
getSize(number) <= 16) &&
prefixMatched(number, 5)
prefixMatched(number, 6)) &&
sumOfOddPlace(number)) % 10 0);
publicstaticintsumOfDoubleEvenPlace(longnumber)
intsum = 0;
for(inti = getSize(number) - 2; i >= 0; i -= 2)
}
// Return this number if it is a
// the sum of the two digits
{
returnnumber;
}
// Return sum of odd-place digits in number
{
String num = number + ';
sum += int.Parse(num[i] + ');
}
// Return true if the digit d
publicstaticboolprefixMatched(longnumber, intd)
returngetPrefix(number, getSize(d)) d;
publicstaticintgetSize(longd)
String num = d + ';
}
// Return the first k number of digits from
// is less than k, return number.
{
{
returnlong.Parse(num.Substring(0, k));
returnnumber;
}
// This code is contributed by nitin mittal.

Output:

Credit Card Number Hacked 2017

This article is contributed by Vishal Kumar Gupta. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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