Abstract
Wireless sensor networks consist of number of small, low power nodes with limited computational capabilities. In such networks, data is collected from various low power nodes by nodes with higher energy than others, called cluster heads. These cluster heads then send this data to a major node called sink. However, this aggregation is prone to many attacks. This paper intends to present a study of the algorithms, protocols and techniques for secure data aggregation in sensor networks. The Hello flood attack is explained and a novel algorithm for defense against Hello flood attack is proposed and simulated using Matlab.
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