<div dir="ltr">Thanks Tom, going to parse through the data tonight. I'm very familiar with the ISO 14443 standard proximity cards but wasn't aware what modulation scheme's they were using, good stuff. I should be able to do some research using my proxmark3, i'll have to code something for the ASK modulation stuff though, yikes.<br>
<br><div class="gmail_quote">On Tue, Jul 22, 2008 at 4:30 PM, Thomas Edwards <<a href="mailto:tedwards@gmail.com">tedwards@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
One quick follow-up, while it looks like all SmarTrip cards use 13.56<br>
MHz, there may be/have been a transition between old SmarTrip Cubic<br>
GO CARDs that were not ISO 14443 B compliant:<br>
<br>
<a href="http://en.wikipedia.org/wiki/Cubic_Transportation_Systems,_Inc" target="_blank">http://en.wikipedia.org/wiki/Cubic_Transportation_Systems,_Inc</a>.<br>
<br>
"Cubic's primary contactless product is proprietary, operating on the<br>
same frequency as the international ISO 14443 standards. The Go Card<br>
uses an 8% NRZ ASK modulation scheme for transmission at 13.56 MHz,<br>
and a ASK-NRZ load modulation scheme for transmission from the smart<br>
card. This format is described International Application Number<br>
PCT/US92/08892 and WO 93/09516, titled "Non-contact Automatic Fare<br>
Collection System", filed Oct. 19, 1992."<br>
<br>
But now WMATA are putting multi-standard readers in:<br>
<br>
<a href="http://www.parking-net.com/NewsItem.aspx?ItemID=18150" target="_blank">http://www.parking-net.com/NewsItem.aspx?ItemID=18150</a><br>
<br>
"Cubic will also upgrade WMATAs fare collection infrastructure with<br>
its patented Tri-Reader, which can process contactless smart cards<br>
meeting ISO 14443. This will allow WMATA to select from a wider<br>
choice of card suppliers and open doors for WMATA to structure<br>
collaborative relationships with smart card issuers from both the<br>
public and private sectors."<br>
<br>
Here is the Tri-Reader data sheet,<br>
<br>
<a href="http://www.cubic.com/cts/Publications/DataSheets/A4/Tri-Reader%202.pdf" target="_blank">http://www.cubic.com/cts/Publications/DataSheets/A4/Tri-Reader%202.pdf</a><br>
<br>
"Secure communications with ISO 14443 Type A, Type B and Cubic GO CARD"<br>
<br>
-T<br>
<a href="http://www.t11s.com" target="_blank">http://www.t11s.com</a><br>
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