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The optimal amount of fraud is non-zero (2022)

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Re: The optimal amount of fraud is non-zero (2022)

#191
post #162
post #139

Earlier quoted context omitted.

I know nothing in IT is certain. But I am pretty sure anyone can come up with a simple (or complex) backup solution that suits them and is 99.99% safe.

It's always about that 0.01%. And expecting people to come up with their own solutions for problems that banks struggle to solve, is going to be a recipe for disaster for 99.99% of the people.

The optimal amount of ....... is non zero

Re: The optimal amount of fraud is non-zero (2022)

#192

This reminds me of Matt Lakeman's "An Attempt at Explaining, Blaming, and Being Very Slightly Sympathetic Toward Enron" https://mattlakeman.org/2020/04/27/explaining-blaming-and-be... He makes the point that although Enron was clearly doing shady things, it's possible for a legitimate business to do many of the same stuff ("mark-to-market" accounting, tricky SPEs, and so on). Try to categorically eliminate Enron-styl…

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Re: The optimal amount of fraud is non-zero (2022)

#193
post #188
post #187

Earlier quoted context omitted.

What country are you talking about? That distinction between credit and debit cards doesn't exist in many countries.

Netherland. It's not entirely clear to me what Americans mean by a debit card, but over here, we tend to pay with our bank card, and simply transfer money directly that way. Although with smartphone apps, the card is now mostly optional; I just pay with the app. Over NFC in a shop, or by scanning a QR code online. Although one of my banks has recently sent me a new bank card with a credit card number on the outside,…

That's a debit card then. In the Netherlands, that historically means Maestro or V PAY, which are indeed not usable for online payments.

But as you've noticed, Maestro is being phased out by Mastercard, to be replaced by Mastercard Debit, and that one will be usable online using its 16-digit card number just like a credit card.

If you don't want to use the online payment feature of it, some banks let you disable it. Otherwise, the worst that can happen is that you're short the money until your bank refunds you in case of fraud – still very frustrating if it does happen, but it's very revocable.

Re: The optimal amount of fraud is non-zero (2022)

#195
post #193
post #188

Earlier quoted context omitted.

Netherland. It's not entirely clear to me what Americans mean by a debit card, but over here, we tend to pay with our bank card, and simply transfer money directly that way. Although with smartphone apps, the card is now mostly optional; I just pay with the app. Over NFC in a shop, or by scanning a QR code online. Although one of my banks has recently sent me a new bank card with a credit card number on the outside,…

That's a debit card then. In the Netherlands, that historically means Maestro or V PAY, which are indeed not usable for online payments. But as you've noticed, Maestro is being phased out by Mastercard, to be replaced by Mastercard Debit, and that one will be usable online using its 16-digit card number just like a credit card. If you don't want to use the online payment feature of it, some banks let you disable it.…

> Maestro is being phased out by Mastercard, to be replaced by Mastercard Debit, and that one will be usable online using its 16-digit card number just like a credit card.

But that's a massive step back. We should be getting rid of payment information on the outside of cards to share with merchants. We should be introducing protocols for secure online payment through your own bank. Which Netherland has (iDeal), but it's not universally internationally supported. (Steam supports it, Lego does not.)

What we need is an international version of iDeal, not turning everything into the insecure system that credit cards use.

> the worst that can happen is that you're short the money until your bank refunds you in case of fraud – still very frustrating if it does happen, but it's very revocable.

Yes, but that introduces fraud into a system that doesn't need it, which will drive up the cost for everybody. It's a step backwards.

Re: The optimal amount of fraud is non-zero (2022)

#196
post #195
post #193

Earlier quoted context omitted.

That's a debit card then. In the Netherlands, that historically means Maestro or V PAY, which are indeed not usable for online payments. But as you've noticed, Maestro is being phased out by Mastercard, to be replaced by Mastercard Debit, and that one will be usable online using its 16-digit card number just like a credit card. If you don't want to use the online payment feature of it, some banks let you disable it.…

> Maestro is being phased out by Mastercard, to be replaced by Mastercard Debit, and that one will be usable online using its 16-digit card number just like a credit card. But that's a massive step back. We should be getting rid of payment information on the outside of cards to share with merchants. We should be introducing protocols for secure online payment through your own bank. Which Netherland has (iDeal), but i…

> But that's a massive step back.

Seen purely from a security point of view, I agree.

But so many people have only exactly one debit card and currently can't use it for online payments abroad at all. Adding that feature to a bank's standard card seems like a good idea from that point of view, especially given that it doesn't add any additional liability. I also think it should be possible to be deactivated, but "on" seems like a reasonable default to me.

> We should be introducing protocols for secure online payment through your own bank.

This exists for credit and debit cards: 3DS! It's even mandatory for many intra-EU payments. If it's not used, chargebacks are mostly trivial to win for banks.

> What we need is an international version of iDeal, not turning everything into the insecure system that credit cards use.

Realistically, that's not going to happen anytime soon. Visa and Mastercard have had many decades to grow their international footprint.

Domestic alternatives have started showing up (e.g. UPI in India, WeChat and Alipay in China) with significant success, though, and I could see some of these eventually expanding to a competing global system. I don't see that happening for an individual EU country's scheme, though; it would have to be something pan-European like the proposed "digital Euro".

Re: The optimal amount of fraud is non-zero (2022)

#197
post #196
post #195

Earlier quoted context omitted.

> Maestro is being phased out by Mastercard, to be replaced by Mastercard Debit, and that one will be usable online using its 16-digit card number just like a credit card. But that's a massive step back. We should be getting rid of payment information on the outside of cards to share with merchants. We should be introducing protocols for secure online payment through your own bank. Which Netherland has (iDeal), but i…

> But that's a massive step back. Seen purely from a security point of view, I agree. But so many people have only exactly one debit card and currently can't use it for online payments abroad at all. Adding that feature to a bank's standard card seems like a good idea from that point of view, especially given that it doesn't add any additional liability. I also think it should be possible to be deactivated, but "on"…

> "on" seems like a reasonable default to me.

Not if users aren't aware of the fact that their bank account suddenly has a massive new vulnerability they have to be looking out for.

> 3DS!

Another system by Visa and Mastercard. I'd really like our payment systems to be independent from that duopoly.

But also: it still has the fundamental problem that credit cards have: you still enter your card number into the merchant's website. From what I understand, only if merchant and customer agree to the extra security, does it actually offer that extra security.

The big advantage of iDeal is that the only thing the merchant has to know, is which bank I use. Merchant redirects me to my bank, sends the payment details to the bank, I authorise the payment on my bank's site with the best security my bank offers, and the bank sends me and the approval back to the merchant.

Many webshops kinda do something like that by handing payment off to their payment provider, but their payment provider isn't my payment provider yet still needs a credit card number. And what if a merchant uses a shady payment provider? But if those payment providers were to support a safer system, and international version of iDeal, that's really all we need. (In fact, I think some of them do support iDeal, which is great.)

But I want to get rid of typing large supposedly-secret-but-not-really numbers from my card into a stranger's webform.

Re: The optimal amount of fraud is non-zero (2022)

#198
post #72

> This is counterintuitive and sounds like it is trying a bit too hard to be clever. You should believe it. Yes, you're > you should welcome greater than zero fraud. You can think of it as a necessary expense, just like rent or salary or advertising is. You don't WELCOME costs just because they're necessary. Similarly, you wouldn't welcome fraud just because it's too costly to get rid of it. And if you add a tiny bit…

The argument seems to be a little different than what you’ve taken from it. My interpretation was something like and efficient frontier model between multiple variables where “zero fraud” isn’t actually a position on that frontier. So, if you find a place with zero fraud, you can possibly increase the total utility of the system by aiming for slightly less than perfect but being back on the efficient frontier. Arguab…

Efficiency frontiers are a game of fantasy (reality is never at the frontier), so it's not relevant whether there is a "zero fraud" point, but also for the same reason a tough argument to make that there are no situations where (even in theory!) such a frontier exists

But that's also not connected to the main critique - I get how you'd welcome more efficiency (at higher costs), but do you get to welcoming costs outside of trying to do counterintuitive rhetoric?

Re: The optimal amount of fraud is non-zero (2022)

#199

Earlier quoted context omitted.

The argument seems to be a little different than what you’ve taken from it. My interpretation was something like and efficient frontier model between multiple variables where “zero fraud” isn’t actually a position on that frontier. So, if you find a place with zero fraud, you can possibly increase the total utility of the system by aiming for slightly less than perfect but being back on the efficient frontier. Arguab…

I don't think you can even make a moral argument in favour of zero fraud, because that implies choosing to harm genuine users. There's always a trade-off between fraud prevention and genuine use. This is extremely important in social benefit systems, where people can literally die if the system incorrectly thinks they are trying to defraud it and cuts them off. Non-zero fraud is useful for political point-scoring, bu…

Why is 0 terrible if it's also on the efficiency frontier?

And what's you moral argument for the level of fraud at the frontier? Is the same efficiency better with lower levels of fraud or higher or indeterminate?

Re: The optimal amount of fraud is non-zero (2022)

#200
post #197
post #196

Earlier quoted context omitted.

> But that's a massive step back. Seen purely from a security point of view, I agree. But so many people have only exactly one debit card and currently can't use it for online payments abroad at all. Adding that feature to a bank's standard card seems like a good idea from that point of view, especially given that it doesn't add any additional liability. I also think it should be possible to be deactivated, but "on"…

> "on" seems like a reasonable default to me. Not if users aren't aware of the fact that their bank account suddenly has a massive new vulnerability they have to be looking out for. > 3DS! Another system by Visa and Mastercard. I'd really like our payment systems to be independent from that duopoly. But also: it still has the fundamental problem that credit cards have: you still enter your card number into the mercha…

3DS is mostly independent standard from Visa and Mastercard. Yes they’re responsible for authoring, but the technical systems underneath are pretty much independent of standard card processing systems. 3DS is basically implemented as a standard set of REST API and html pages, with a standard around how the 3D flow is initiated, and crypto tokens exchanged via standard card payment ISO messages.

Nothing would prevent you from strapping 3D onto any other payment system of your choice.

Merchants have to choose to perform 3DS, but EU Strong Customer Authentication rules make it mostly mandatory for EU merchants to use 3DS. They can only really opt-out if they can consistently demonstrate they’re capable of detecting and preventing fraud, keeping it at levels that are basically equivalent to fraud seen on 3DS transactions.

The card number alone is not enough to perform a card transaction. There are some merchants out there that are capable of performing card transactions with only the 16-digit number, such as Amazon, but you need to be a very large merchant, and demonstrate you’ve got effective fraud controls in place to prevent abuse. Any smaller merchant attempting something similar will find their merchant accounts quickly closed, and all transactions automatically refunded.

> Many webshops kinda do something like that by handing payment off to their payment provider, but their payment provider isn't my payment provider yet still needs a credit card number. And what if a merchant uses a shady payment provider?

They mostly don’t exist. Becoming a payment provider on the Visa and Mastercard networks is expensive, difficult and very time consuming. Additionally Visa and Mastercard monitor all network participants, if they’re seen to be misbehaving then they get disconnected from the network, and their collateral payment is seized. So running a shady payment processor isn’t profitable.

The system isn’t perfect, but most of things you’re concerned about don’t happen in the EU. They happen a lot in the U.S., but the U.S. has a very different culture around money to the EU, and their payment systems are a bit more bonkers. Which is why EU banks tend to get a bit trigger happy with their fraud rules when customers travel to the U.S.

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