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Re: [Cryptography] Anti-counterfeiting microchip

On Wed, Sep 6, 2017 at 5:33 AM, Camille Harang via cryptography <cryptography AT metzdowd.com> wrote:
Le 06/09/2017 à 01:29, Jerry Leichter a écrit :
> Hmm. A couple of years back, when Intel proposed to add a unique ID to
Hello Jerry, thanks for your reply. Yes indeed there are serious
tracking issues with this kind of technologies. My motivation is to make
transportable goods usable as cash,

Cash has serial numbers but they cannot be read from a distance.
OCR tech would allow a dispenser to log all the serial numbers dispensed
on any transition.   Cashregister tech could also read serial numbers. 

The important thing to look at is the cost of the first transaction.
A reader and computer with connectivity have a cost.

Cash transactions have no cost beyond the risk of theft (taxation can apply).

Barter transaction have no cost beyond the risk of theft (taxation can apply). 

Currently cash transactions are under pressure to vanish.  The merchant does not
risk theft at the point of sale (hacking at Target).   Transactions involving 10,000 in
the US are to be reported.

It seems the entry at the low end is a barrier and law enforcement would want to 
play in the $10,000 and above range.   

I can see an RFID device that has a fuse link key that cannot be inspected
and could be challenged with a random sequence to return a good hash
of that challenge.   If the owner of the key in involved and keeps track of challenge keys
it will never submit the same key twice to eliminate replay spoofing as an authoritive
attack.   Power in an RFID device limits so much that this may collapse to something too
simple to be secure.

Hard wire the device in a board so it can be read when power is on and 
the Intel push back would replay.   

There may be special cases where this notion has value and tomorrow is 
a new day.

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