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Message authentication is one of the most effective ways to thwart unauthorized and corrupted traffic from being forwarded in Wireless Sensor Networks (WSNs). To provide this service, a polynomial-based scheme was recently introduced. However, this scheme and its extensions all have the weakness of a built-in threshold determined by the degree of the polynomial: when the number of messages transmitted is larger than this threshold, the adversary can fully recover the polynomial. In this paper, the authors propose a scalable authentication scheme based on Elliptic Curve Cryptography (ECC).
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