Re: T=1 with CRC ?
- From: tum_ <atoumantsev_spam@xxxxxxx>
- Date: Wed, 23 Feb 2011 01:32:28 -0800 (PST)
On Feb 22, 5:58 pm, Francois Grieu <fgr...@xxxxxxxxx> wrote:
So you have terminal-side code and verified that it handles the CRC
case and appears to use the (x^16 + x^12 + x^5 + 1) polynomial;
thanks for the insight.
Exactly. I could not find any instances of (x^16 + x^15 + x^2 + 1)
that you've mentioned in your original post.
> I do remember that we had some peculiar problems with some T=1 cards,
> and we investigated the problem and took traces. But this was some 8-9
> years ago, I'm afraid I've lost those traces when I changed my PC :)
These things happen. If you ever step on a backup, or just remember
the nature of the card used...
Again, I wish I could get my hands on (or traces of) a true T=1
Smart Card asking for CRC; never seen one.
I have to tell that I never said that I saw one either. I saw T=1
cards but whether they
had CRC or LRC - no idea. Hmm, if my memory still serves me - the card
we had problems
with was issued by some Austrian bank - and that's about all I can
recall at the moment.
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