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In this paper, the authors propose simple hash based message authentication and integrity code algorithm for wireless sensor networks. The proposed scheme uses pre-shared secret key which is obtained from Elliptic Curve Diffie Hellmann (ECDH) key exchange algorithm, and is based on modified SHA-1 (mSHA-1) hash function which helps to compute message authentication code for given messages. They suggest two scenarios depending on scale of the network, and also analyze security of the proposed algorithm. This algorithm provides both integrity and authenticity of a message with only one hash value.
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