3 Evaluation Criterion

We will describe some of the common attack strategies that relate to unauthorized authentication or stealing private information inside the user smart tag

• Eavesdropping activities via a rogue reader:
  An outside eavesdropper may attempt to figure out the secrecy hidden in the communication message, then the user privacy is no longer under protection.
• Impersonation of innocent smart tags:
  An adversary may attempt to clone a fake tag with the information fetched from a physically compromised smart tag or a eavesdropping to a legitimate smart tag. The attacker may conduct misbehaving activities in the wrong name of innocent victim.
• Reply Attack:
  An adversary that monitors on a legitimate communication channel and replay its message at some later time engages in a reply attack. Since the replayed message originated from the authorized node, the same receiver will accept it again. In that situation, the attacker could pass the security without knowing the innocent’s secret.