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  2. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    Luhn algorithm. The Luhn algorithm or Luhn formula, also known as the " modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in U.S. Patent No. 2,950,048, granted on August 23, 1960.

  3. Card security code - Wikipedia

    en.wikipedia.org/wiki/Card_security_code

    A card security code ( CSC; also known as CVC, CVV, or several other names) is a series of numbers that, in addition to the bank card number, is printed (but embossed) on a credit or debit card. The CSC is used as a security feature for card not present transactions, where a personal identification number (PIN) cannot be manually entered by the ...

  4. Payment card number - Wikipedia

    en.wikipedia.org/wiki/Payment_card_number

    Payment card numbers are composed of 8 to 19 digits, [1] The leading six or eight digits are the issuer identification number (IIN) sometimes referred to as the bank identification number (BIN). [2] : 33 [3] The remaining numbers, except the last digit, are the individual account identification number. The last digit is the Luhn check digit.

  5. How long can a debt collector pursue old debt?

    www.aol.com/finance/long-debt-collector-pursue...

    The statute of limitations is a law that limits how long debt collectors can legally sue consumers for unpaid debt. The statute of limitations on debt differs by state and type of debt, ranging ...

  6. List of Internet top-level domains - Wikipedia

    en.wikipedia.org/wiki/List_of_Internet_top-level...

    A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database. [1] IANA also oversees the approval process for new proposed top-level domains for ICANN. As of April 2021 [update], their root domain contains 1502 top-level domains. [2] [3] As of March 2021 [update], the IANA root ...

  7. Social Security number - Wikipedia

    en.wikipedia.org/wiki/Social_Security_number

    In the United States, a Social Security number ( SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. ยง 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent ...

  8. Check digit - Wikipedia

    en.wikipedia.org/wiki/Check_digit

    Modulo 10 check digits in credit card account numbers, calculated by the Luhn algorithm. Also used in the Norwegian KID (customer identification number) numbers used in bank giros (credit transfer), Used in IMEI of mobile phones. Last check digit in EAN/UPC serialisation of Global Trade Identification Number . It applies to GTIN-8, GTIN-12 ...

  9. 3-D Secure - Wikipedia

    en.wikipedia.org/wiki/3-D_Secure

    3-D Secure. Not to be confused with card security code. 3-D Secure is a protocol designed to be an additional security layer for online credit and debit card transactions. The name refers to the "three domains" which interact using the protocol: the merchant/acquirer domain, the issuer domain, and the interoperability domain. [1]