First, we show that the mutual authentication
protocol suffers from block messaging attack which breaks
the synchronization between the RFID reader and the tag and
therefore makes the RFID tag unreachable. This attack can
be carried out by blocking the third round of the protocol.
Then, we show that their protocols are not resistant message
injection attack because of the lack of message integrity. With
this attack, the synchronization between the tag and the reader
is broken. Next, we present a disclosure attack to extract the
ID of the tag.