The current situations of sensor network security

the security challenges and the security problems were pre-sented.From the aspects of key management

secure routing

authentication

intrusion detection

DoS attack

access con-trol

all the security techniques of sensor networks were introduced and discussed

and the comparisons were made to help researchers select and design the security solutions for a particular sensor network application environment.At last

the further direction of sensor network security techniques was summarized and discussed.