MIXNET for Radio Frequency Identification

Privacy concerns have been raised with current and forthcoming implementations of RFID tags. The two main concerns are tracking and inventorying. Cryptosystems are being developed in order to curtail these potential abuses. Conventional cryptosystems that permit re-encryption do so only for a player with the knowledge of the public key corresponding to a given ciphertext. This kind of approach does not scale and is not practical. However, universal re-encryption in a MIXNET can be implemented without the servers holding any knowledge of public keys. Using existing techniques to implement an asymmetric cryptosystem with universal re-encryption in a MIXNET, we examine the ramifications of building such a system and also simulate its behavior with a Java implementation.