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Carbon copy electronically signing credit card number

your credit card number is not random in fact much like the zodiac cipher or text your dad sent you using siri there is a secret meaning underlying this cryptic string of symbols is it important to be able to decipher your own credit card number no not really but is it a cool party trick well also probably no unless your party is just a bunch of nerds sitting in a room and since that basically describes my viewer base let's learn how to decipher credit card numbers here is a credit card this number usually called the primary account number or daddy's one-way ticket to a brand new tesla can actually be divided up into three distinct sections the first six to eight numbers of any card number aren't unique to you they're used to denote basically the institution that issued the card the first digit of this sequence can tell you the general industry your card belongs to one and two for airlines three for travel and entertainment industries four and five for banking six for banking or merchandising seven for the petroleum industry eight for health care and communications 9 for national government purposes 0 for the international organization for standardization itself which runs the system and a poorly drawn smiley face for credit fraud organizations run by children the next five to seven digits narrow the card down to its specific credit network like visa or mastercard the actual register of these numbers isn't technically supposed to be public information but because i'm an internet super celebrity with special secret access to insight sources i'm just gonna list some of them anyways american express owns the numbers starting with 34 and 37 mastercard owns two two two one through two seven two zero plus 51 through 55 and visa somehow managed to snack pretty much every string beginning with the number four the next section which can vary in length but is generally under 12 digits is what's used to identify the individual account within the credit network that your number belongs to basically this just means that if you're planning on stealing your rich friend's credit card while he's in the bathroom but you only have time to write down half of it because you recently had that hot new bladder shrinking surgery that all the rich people were getting for some reason this is the string of numbers you'll want to write down and that brings us to the last digit which is called the check digit this is how computers can filter out most invalid numbers without needing to actually read through their big book of legitimate credit cards it's calculated using something called the lun algorithm which goes a little something like this step one remove the last digit of your credit card number this is the check digit itself so it's not part of the calculation step two starting from the last digit of your remaining number moving left double...