On Tuesday 21 March 2006 14:38, Peter Tomlinson wrote:
> There is provision in ISO/IEC 7816 for a card to identify itself in
> several ways, but the majority of card suppliers either do not encode
> the necessary information or encode it inadequately - or it gets changed
> to something else during personalisation. Typically the ATR may be the
> starting point, or there may be extended information in an ATR File -
> and there may also be a DIR file giving a directory of card
> applications. (EMV of course has its own method of application selection.)
>
> GlobalPlatform also has provision for ID information, using data objects
> stored at the MF level.
Both of which require a 7816 file system (or enough of one, anyway). As more
and more Javacards are deployed, fewer cards have a file system :-/
> We are still in the mindset that thinks bytes are extremely expensive,
> and we need to get out of that and do the job properly.
What's funny about that is I've seen one system that fires literally dozens of
APDUs at a card in an attempt to determine what is on it... it would take far
fewer bytes to query a file structure.
Shawn.
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