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+http://www.opensc-project.org/
+This is a great project,  and I believe this is a secure method of access 2 phase security need both card and key.  Also, when the key is entered wrong 4 times the card resets itself and is void.  This is mainly used for networks that need highly secure access and for financial transactions.. though I think with a little bit of work we can get something working for our door.
+http://www.opensc-project.org/opensc/wiki/PinpadReaders
+This has a list of readers that work with the opensc project..
+http://www.reiner-sct.com/content/view/4/16/  -- has linux drivers
+we would have to construct some type of box to keep the pinpad out of the rain.  The pin pad should be connnected via ethernet.. also power over ethernet should be a option.
+http://www.smartcardsupply.com/Content/Cards/ISO7816.htm  pretty cheap, 2.80c a piece.
+Though, I get the impression that we could rig this up another way, since we have some hardware hackers.. we could get a low cost smart card reader with out the pinpad.. then possibly hook up the number pad part of a pc keyboard.  This would need to goto a small node machine on the inside that would handle key comparison, software would need to be written to hand keys from the door to opensc.. I imagine though if we look close enough we would probably find a few scripts on some mailing list that would help tie things together.
+https://www.scbsolutions.com/express/product_info.php?products_id=67  &lt;- cheap smart card reader..