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In order to solve the excessive computation and storage requirement arising due to the frequent sensor nodes
movement in WSN, a new public key has been proposed based on ECC key agreement protocol. The mutual authentication
and agreement on a session key can be realized between users, or between user and a network server in WSN. This
protocol adopts ECC techniques to consult session keys and AES Symmetrical encryption technology to achieve confidentiality.
Compared with traditional protocol, this protocol could provide greater security with relatively fewer bits and
reduce the requirement of computation and storage. A protocol has been proved to be a secure authenticated key agreement
in ID-BIM models. Results show that it provides a perfect forward/back secrecy and PKG forward secrecy.