11–20 of 360 posts
Can Japan not obtain another country code from Visa/Mastercard (part of the first 6 digits)?
Assuming the last digit is a checksum and the first six are taken by the routing information, that leaves them 9 digits or a billion possible numbers per credit card issuer. Japan has a population of about 125 million. Are Japanese people cycling their numbers so frequently? Or are they big on ephemeral card numbers? Is it not possible for an issuer to get a second prefix if they run out of digits? I also wonder if c…
>the company decided to take makeshift measures such as reusing credit card numbers of discontinued cards after a certain period had passed since cardholders canceled their memberships. However, there are considerable risks of fraudulent usage What are the risks here, and why aren't they already present by someone generating credit card numbers with a RNG? AFAIK credit card transactions are authenticated by at least…
What if they switched CC numbers TO IPV6 addresses? Insane or genius?
Also, I'm not enthusiastic about trying to communicate an IPv6 address over the phone to the wage slave working at the pizza joint. You'd have to implement one of those address-to-word setups, which would make for some amusing card "numbers". How would you like getting a card with "chinky challis uta ablow wiry rehaul a carotin" on the front?
Something like: http://jubei.ceyah.org/cgi-bin/ipv6toenglish
What I really don't understand is why the article makes it seem like a national problem given the prefix is assigned to the companies, rather than countries as such. (Although companies will get ranges and then assign specific IINs countries normally)
It seems that IINs are undergoing changes anyway and April 2022 is a deadline for everyone to support 8-digit prefixes correctly.
Assuming the last digit is a checksum and the first six are taken by the routing information, that leaves them 9 digits or a billion possible numbers per credit card issuer. Japan has a population of about 125 million. Are Japanese people cycling their numbers so frequently? Or are they big on ephemeral card numbers? Is it not possible for an issuer to get a second prefix if they run out of digits? I also wonder if c…
I don't see how token based transactions would improve the situation. You still require a unique identifier per issuer per client per account.
SUrely, there's some inefficiency in how numbers are used... 10 quadrillion for 7.5 billion people isn't enough?
[1] https://en.wikipedia.org/wiki/Payment_card_number#Structure
SUrely, there's some inefficiency in how numbers are used... 10 quadrillion for 7.5 billion people isn't enough?
SUrely, there's some inefficiency in how numbers are used... 10 quadrillion for 7.5 billion people isn't enough?
The main problem is that in Japan everybody has like 5 credit cards, because every big company has its own financial branch and issues cards (maybe to profit from a "reservoir" effect of the accounts?). So you have a credit card linked to your clothes shop, one from your supermarket, one from Rakuten (Japan's Amazon), etc. You get points when you buy things from the company linked to your card. I don't know how it is in US, but it certainly isn't like that in France for example.