ST Alpha - "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" (Reading a Post)

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In response to "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" by mandy, queen of scots

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

Posted by lileve (aka lileve) Jul 1 '11, 07:23

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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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