ST Alpha - "the account numbers of credit cards are 12 digits. the last four digits are check digits and the security code is different to that. am I incorrect? -- nm" (Reading a Post)

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the account numbers of credit cards are 12 digits. the last four digits are check digits and the security code is different to that. am I incorrect? -- nm

Posted by mandy, queen of scots (aka amanda) Jul 1 '11, 07:22

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Responses:

almost correct. (i looked it up). the last digit is the check digit - decline Jul 1, 07:34 1
- I make out with your wallet. thanks for googling for me. -- nm - mandy, queen of scots Jul 1, 07:54
yes we now have 2 Sec codes a 3 digit and a 4 digit -- nm - Danedukenuuk Jul 1, 07:25
I think you are correct. I didn't know the last four were called check digits. I meant the security code in the BB. -- nm - lileve Jul 1, 07:23 2
- so because those check digits are radom, being off by *one number* is virtually impossible. the check digits were designed to prevent keying errors. -- nm - mandy, queen of scots Jul 1, 07:24 1
  - Yes. Guess my wonder was before websites asked for those security numbers that are embossed on the backs of cards. -- nm - lileve Jul 1, 07:26

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