False data injection attack is a serious problem in data aggregation along with achievement of security mechanisms like. integrity and authentication. Compared with conventional desktop computers, implementing security mechanisms that provide authentication, confidentiality and integrity is not easy in wireless sensor networks due to the limited processing power, storage, bandwidth, and sensor node energy. Because of these characteristics such a kind of network suffers from a lot of problems such as data forgery, Sybil attack, worm hole attack, false data injection and other security attacks. Data Aggregation plays an important contribution to improve the multicast communication in hierarchical sensor network. Although data aggregation is very useful, it could cause some security problems because a compromised data aggregator may inject false data during data aggregation. When data aggregation is allowed, the false data detection technique should determine correctly whether any data alteration is due to data aggregation or false data injection. Further, existence of these attacks in data aggregation process has severe effect on the aggregated value which may lead to wrong information the base station or end user. Detection of these attacks and to minimize the loss due to these attacks is one of the major challenges in sensor networks. A combined data aggregation and false data detection technique should be there to ensure that data are altered by data aggregation only.
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