RFID Questions

Quote: Ayecarumba

Not that I have 1.5M - 2.5M in chips burning a hole in my backpack or anything....

Too bad. If you did, I might know something about RFID in casino chips.

As it is, we're depriving a defense lawyer or two a hefty fee for services ;)

From what I know about RFID, rather than the tag say something like "$25,000 chip, id number 123212"
it would say "1239594799345843294923" which would then be converted to a value using software at the cage. The numbers would be non-sequential so you couldn't guess the next chip by changing the last digit to a 4.

Also the number would be some sort of algorithm to verify its legit. Simple algorithm's might be add all the numbers up and they are divisible by 9 without a remainder, I am sure there is something similar on credit card numbers so when you enter it on a webpage the server knows if the number is valid before it even checks the number. Or the fourth number is always odd, or the 3 rd number is always the sum of the 1st and 2nd. The list goes on....

Even if you could read the number, it is of no use to you unless you have the database that goes with it. The chip in question may show up as a Great Dane from Ohio called Charlie, because each database is unique to the values assigned to it.

Quote: WizardofEngland

Also the number would be some sort of algorithm to verify its legit. Simple algorithm's might be add all the numbers up and they are divisible by 9 without a remainder, I am sure there is something similar on credit card numbers so when you enter it on a webpage the server knows if the number is valid before it even checks the number. Or the fourth number is always odd, or the 3 rd number is always the sum of the 1st and 2nd. The list goes on....

You're thinking of a check digit, although it's more for error detection than security.

Your right I am, couldn't remember the name. But the same principal can be applied here. Without knowing the exact combination, any pseudo created id's would have only a small chance of being correct, and raise more red flags.