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Authored by: BitOBear on Saturday, April 21 2012 @ 06:09 PM EDT |
If the receipt data is purely for your records then they don't have to be
secure.
If the receipt data is to be offered as proof to people other than yourself then
the data could be cryptographically signed with a verifiable public key. This
would be secure and good (enough) for business and government reporting.
Nobody has yet solved the e-cash problem in a secure way, so having the actual
cash value as a transmittable valid value not so much.
Encoding your balance so that you track it in the card as
balance-minus-purchases is okay if it is purely informational to the card
holder.
[ Reply to This | Parent | # ]
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Authored by: Anonymous on Sunday, April 22 2012 @ 07:53 AM EDT |
For sure, you wouldn't *want* to run Oracles bloated monster on a credit card.
But if I could (say), keep a database of all the books I own (>1000) on a
credit card sized device, I absolutely would want to do that.
Then could easily avid buying a duplicate book....again.
Probably such a minor quibble in this context though that's it's not worth
wasting court time on.[ Reply to This | Parent | # ]
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