To ensure the quality of service(QoS) and security of mobile multicast in the wireless sensor tracking
networks(WSTNs), an optimal QoS secure anthentication algorithm is presented, which makes the speed of the monitoring
entity and relevant parameters of multicast applications to vectorization. Furthermore, the level number ?? of the
authentication protocol and the multi-level ??TESLA meeting with the optimal QoS are derived. The analysis and simulation
results show that this algorithm can analyze and predict effectively the corresponding key level of authentication under
the certain QoS requirements, and the impact on network energy consumption and real-time communication is acceptable.