Radio frequency identification (RFID) is one popular technology being deployed for a variety of applications. Privacy and security issues play major roles in the success of RFID applications due to ease with masquerade, eavesdropping, etc. over the insecure channel between the tag and the reader. These security requirements are summarized: indistinguishability, forward security, ownership transfer, and resistance to replay attack and tag killing. Much research has been proposed. Except Osaka et al.'s scheme, none can meet all requirements. However, this paper introduces a new type of DoS attack which is ignored in these research studies to endanger their securities. As Osaka et al.'s scheme is superior to the others in terms of the functionalities, we take it as an example to show the possibility of the new DoS attack. A remedy is further provided to enhance the security to make the scheme more practical.
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