Abstract:

The method to use  secret information to verify the legitimacy of the nodes was presented and Diffie-Hellman algorithm was used to generate the shared key for guaranteeing the security of the key so as to overcome the weakness of localized encryption and authentication protocol. The analysis of the original scheme and the improved scheme from the security and node overhead shows that the computational cost is slightly  increased in the improved scheme, but the security of the network is improved.

Key words: wireless sensor network, key management, security, Diffie-Hellman algorithm