Re: [Full-disclosure] NiX API

[mrx <mrx@xxxxxxxxxxxxxxxxxxx>]

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On 09/06/2011 16:05, nix@xxxxxxxxxxxxxxxx wrote:
> Primarily this is an advertisement.
> 
> 
> I would guess that it is some anti-hack system for webmasters who haven't
> a clue, a kind of auto-generating block list.
> I'm a noob and I am just guessing.
> 
> 
>> It does provide great protection also to those webmasters who got a clue.
> 
>> We had fraudulent purchase almost every second day, paypal let every
>> fraudulent purchase through and the ** next day ** their automation
>> reversed the payment. ..
> 
>> Needless to say how much we got frustrated and pissed while filing their
>> forms regarding unauthorized claims. We were also charged by paypal for a
>> certain percentage of each fraudulent payment!
> 
>> This is where NiX API comes in:
> 
>> In most cases, the malicious user is denied access even before a
>> fraudulent purchase is made!
> 
>> Since implementation of NiX API with it's current featuers: 0 fraudulent
>> purchases in last 2-3 weeks period. It definitely does something.
> 

I don't see how it is possible to tell a fraudulent paypal payment from a 
legitimate one, unless the IP address used to make the purchase is all
ready known as a source of fraudulent transactions.

Obviously if "John Smith" made a payment from an IP address originating from 
China, Japan or other non-English/American IP address range then
something is suspect, but this is still not definitive.

How could this system stop a fraudulent payment from a source with an IP 
address the system has never seen before originating from a corporate
address block or respected ISP, or unlikely but not impossible an IP address 
that has previously made a valid transaction?

Any smart fraudster would use a device purchased with cash using a spoofed MAC 
address from a wifi hotspot out of sight of CCTV.

Please enlighten me, or would that let the cat out of the bag?

regards
mx

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