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I’d like a little help from any knowledgeable person
on tuning the inductance properties of a “proposed open source smartcard antenna”,
for an educational toolkit board we built at ventavia.com for experimenting with
commodity smartcard technology. The board allows one to study wireless uses and
configuration of musclecards in various operational theatres – where you
can add suitable electronics for each environment, to otherwise commodity components.
I’d like to ship the board one day as an educational toolkit, with some
cutting edge experimentation cookbook that gives the buyer a head start in open
design issues. The board can be used in various inductance loop environments
– such as those built widely into local city streets across the It costs about $500 to manufacture each board – which are
professionally manufactured, but hand tuned/tested for component choices. In
mine, I mounted a commodity-grade GEMPLUS combi SIM, and set jumpers to access the
board’s onboard antenna. The antenna has parameters similar to those
found in commercial USB dongles supporting combi-cards, and one can mount
scoping points easily for field analysis on suitable scoping equipment. The
board also has an external antenna attachment point for use in with an alternative
Near Field antenna, and also other experimental antenna such as that to be
design in the study I’m proposing. If you can fabricate your own LQFP
packaged chips (e.g. the university EE lab) you can also play with antennas
within the chip packaging itself. The design issues that seem pertinent to characterize are
not necessarily those of addressing id tracking and movement privacy, per se. Its
not the big brother conspiracy - that is really the design focus, here. The focus
is perhaps more about the degree to which general infrastructure can activate
or interfere with configured security features, remotely, or the correct reporting
of capabilities to discovery processes. It’s the question of whether, for
example, the signals can remotely disable the bus to the crypto co-processor, remotely
undelete data in certain types of EEPROM technology, or deposit covert signature
information into the device’s eeprom technologies electrical fields. It’s
the issue of technology _interaction_
that are perhaps the real study topics – electronic, electrical, RF, and
memory technologies. Then we consider what software OS and applet design supporting
a feature discovery capability should do, to accommodate commodity die with we
can assume will have such properties. Moving feature discovery from the host driver or traditional
terminal (which rarely move) to the USB dongle reader (which moves with the
chip) or to the card itself has various systemic impacts that we should
understand - before choosing how to best update the current cardedge. Beyond creating
proposed software changes, we have to look for and consider wider issues. Peter. |
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