NeoMedia Technologies, Inc (NEOM)

[Elementus]

RFID tag installed into mobile phone can be used as electronic pocket. It is much more secure than files on local disks, java sandboxed storage and so on. For instance, SONY Felica, is really secure thing I personally played with it half a year ago..
Even more, tickets ordered via 2D smark tags can be stored in NFC tags... Companies testing dual technology now - you can communicate NFC chip wirelessly and on board.

As to tagging - I agree with you 100% - 2D tags is more secure because user MUST initiate session. Password is an option but not everybody set it for bluetooth even:)