A Simple Delegation Scheme for RFID Systems (SiDeS)

Many privacy protecting schemes for RFID (radio frequency identification) technology assume that reading devices (readers) have continuous connectivity with a centralised online database in charge of the identification of a certain amount of tags. However such centralised models can raise scalability and latency problems. Moreover, they are not suitable in applications where connectivity is intermittent. In this paper, we introduce SiDeS (simple delegation scheme), a protocol that allows a centralised database to delegate temporarily and in a secure manner, the capability to identify tags, to readers. SiDeS not only requires simple cryptography functions like XOR, hash functions and random number generator but also manages tags ownership transfer.