I was reading this article from Life Hacker, [How to Automate Your Phone for Every Room in the House with NFC Tags](http://lifehacker.com/how-to-automate-your-phone-for-every-room-in-the-house-473409963). The idea is to place NFC tags around your house, car, etc. so that you phone will automatically do some action when you touch the tag. Clearly, this seems to be a security challenge. In many ways it would be similar to QR code attacks, where you are trusting something with low physical security that as a human you cannot decipher; however, a QR code would require you to actively load a reader and focus on the code, where NFC just need to be nearby with a service running in the background.

I am curious what security concerns come in to play with NFC tags and how to defend against these threats. For example, some tags could be reprogrammed without the user's knowledge or a tag may be cloned. Are there available methods for protecting integrity and confidentiality? 

Ruling out things like payments and phone to phone connections, just looking at read-only tags, are there feasible passer-by attacks, and if so, what are some protections measures for users? Could NFC be used to trigger undesired, unplanned, or unauthorized commands on a reader/phone?

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Edit: It looks like [Wikipedia actually describes some attacks](http://en.wikipedia.org/wiki/Near_field_communication#Security_aspects), many of which are familiar for any wireless type of technology (open medium)