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#1 2009-06-13 10:09:28

rule
Moderator
Registered: 2008-05-21
Posts: 416

How does a valid ISO14443-A trace look like

A valid ISO14443-A trace should be conform the master/slave operations that smartcards are using. The reader(master) asks a question by sending a command, the tag(slave) answers with the response. This means that for every command from the reader you should have captured a response from the tag. The only exception to this is the HALT (50 00 57 CD) command, which requests the tag to deactivate itself, after deactivation no response is returned. The following example trace demonstrates this:

+ 381375:    :     26
+     64:   0: TAG 04  00
+   3432:    :     93  20
+     64:   0: TAG 84  76  81  dd  ae
+   7345:    :     93  70  84  76  81  dd  ae  01  9a
+     64:   0: TAG 08  b6  dd
+   5368:    :     50  00  57  cd

This trace shows the anti-collision process of a MIFARE Classic card.
More information about the anti-collision of a ISO144443-A tag is available here.

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