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After I developed an android app to extract the keys from the chinese sniffer/super card, I found something interesting that caused the app to always retrieve the same (wrong) key.
When a tag is approached to a phone (in this case SGS3 with CM11m12 (Android 4.4.4)), before resolving an intent, the phone tries to authenticate two times with key a0a1a2a3a4a5. This caused problems with the sniffer card, which of course captured this communication.
*edit* After some research, this seems to be an access of the MIFARE Application Directory (MAD) http://www.nxp.com/documents/application_note/AN10787.pdf
So, not really proxmark related, but does anyone know if this discovery can be disabled easily in android?
Last edited by steve (2015-07-10 23:42:08)
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