Providing apparatus and method capable of protecting privacy mac frame in ieee 802.15.4 networks

The present invention relates to a security method in an IEEE 802.15.4 network, and (Medium Access Control) MAC header that provides various information regarding the communication, with the main data in accordance with the frame type is carried is the payload defined in the MAC header and a process of inserting them by creating a (transmission sequence number Data sequence number), (Payload), and FCS (frame Check sequence) process and the decoy (decoy) DSN stomach in the MAC header to generate a MAC frame including a the payload (payload) in the process and, the network preset link key that is within the plurality of nodes to share (link to the payload inserting this, by generating the transmission serial number of real (real) DSN of the MAC frame, the process of transmitting the MAC frames to encrypted with a Key) and the step of receiving a MAC ACK frame for the delivery confirmation of the MAC frame, the DSN and the real DSN of the received MAC ACK frame The comparison process, and the comparison result that, when the same is characterized in that it comprises the step of performing authentication on a correspondent node. IEEE 802.15.4, network security, MAC frames