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The Social Security number is a nine-digit number in the format "AAA-GG-SSSS". [35] The number has three parts: the first three digits, called the area number because they were formerly assigned by geographical region; the middle two digits, the group number; and the last four digits, the serial number.
The security code: Security codes on credit cards are often referred to as card verification values (CVV) or card verification codes (CVC). These codes are three or four digits on their own, and ...
A mobile phone may be PIN protected. If enabled, the PIN (also called a passcode) for GSM mobile phones can be between four and eight digits [41] and is recorded in the SIM card. If such a PIN is entered incorrectly three times, the SIM card is blocked until a personal unblocking code (PUC or PUK), provided by the service operator, is entered. [42]
Therefore, systems that pad to a specific number of digits (by converting 1234 to 0001234 for instance) can perform Luhn validation before or after the padding and achieve the same result. The algorithm appeared in a United States Patent [ 1 ] for a simple, hand-held, mechanical device for computing the checksum.
Social Security Number, Definition. A Social Security number is a unique nine-digit code that’s used to identify you and track your earnings over the course of your lifetime. These numbers were ...
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.