RFID & Privacy

Radio Frequency Identification (RFID) is a method of remotely storing and retrieving data using devices called RFID tags. An RFID tag is a small object, such as an adhesive sticker, that can be attached to or incorporated into a product. RFID tags contain antennae to enable them to receive and respond to radio-frequency queries from an RFID transceiver.

There are a lot of webs that talk about RFID, as RFIDJournal

But for privacy issues and RFID theres is an interesting workshop at: www.rfidprivacy.org

And you can find there a paper about Privacy without cryptography.