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More credit card fraud - and this one's really scary

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Freddyfruitba...
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Joined: 20 May 2016
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PostPosted: 10:06 - 02 Mar 2022    Post subject: More credit card fraud - and this one's really scary Reply with quote
Scammers guessed my credit card number – and they could guess yours too
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arry
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Joined: 03 Jan 2009
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PostPosted: 10:40 - 02 Mar 2022    Post subject: Reply with quote
Quote:
The first six digits of a credit card number signify the card network and the issuing bank, while the final digit is the Luhn algorithm checksum.”

That means they only have to guess seven numbers, while that final Luhn digit helps verify whether the rest of the card number is valid.


Only had to guess 7 numbers - why don't they just play the lottery FFS Laughing

Quote:
Domino’s did request the CVV of the first card but that, too, was guessed


Oh, I thought they just had to guess 7 numbers?

Presumably the expiry date of the card was a lot easier a guess than the 7 digits - in the right order - on the main card number, along with the 3 digit CVV from 999 possible combinations.

Jesus.
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Fat Angry Scotsman
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Joined: 12 Jan 2021
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PostPosted: 10:49 - 02 Mar 2022    Post subject: Reply with quote
arry wrote:


Oh, I thought they just had to guess 7 numbers?

Presumably the expiry date of the card was a lot easier a guess than the 7 digits - in the right order - on the main card number, along with the 3 digit CVV from 999 possible combinations.

Jesus.


I don't think it's that simple. I have accidently used my brothers debit card on JustEat when I forgot to switch it back to mine one time and even though we have totally different CVV numbers, it went through and charged him even though I put in my own CVV.
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arry
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Joined: 03 Jan 2009
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PostPosted: 10:56 - 02 Mar 2022    Post subject: Reply with quote
Fat Angry Scotsman wrote:

I don't think it's that simple. I have accidently used my brothers debit card on JustEat when I forgot to switch it back to mine one time and even though we have totally different CVV numbers, it went through and charged him even though I put in my own CVV.


Accepting that the CVV isn't sometimes used as the verification it should be, they still have to guess 7 numbers - in the correct order - and the date combination. I suspect strongly that this isn't a 'guess-hack'.
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Freddyfruitba...
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Joined: 20 May 2016
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PostPosted: 12:23 - 02 Mar 2022    Post subject: Reply with quote
arry wrote:
Only had to guess 7 numbers - why don't they just play the lottery FFS

It's not like there's only one single 7-digit number they're looking for though, is it? There'll be tens of thousands? hundreds of thousands? who knows.

Can these people fire numbers systematically at a paying system like Dominos, until they come across ones that work? Like a hacker using a dictionary attack to get pass an online password? You'd hope that a payment system would detect and block that, but what do I know?

Fat Angry Scotsman wrote:
I have accidently used my brothers debit card on JustEat when I forgot to switch it back to mine one time and even though we have totally different CVV numbers, it went through and charged him even though I put in my own CVV.

Doesn't that just demonstrate that the likes of Dominos aren't actually using the CVV then?
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Ste
Not Work Safe



Joined: 01 Sep 2002
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PostPosted: 13:19 - 02 Mar 2022    Post subject: Reply with quote
The cards details will have been checked / verified using the same tools that autoshops use and then the card details will be sold on an autoshop for probably just a few pounds / dollars / dollarydoos. Shhh!
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The last post was made 3 years, 294 days ago. Instead of replying here, would creating a new thread be more useful?
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