The need for human efforts are on the verge of reduction as the need for automation is on a constant rise and one of the most important tool towards achieving this is with the use of Wireless Sensor Networks(WSN). With its constantly evolving needs like in traffic surveillance, smart cities, commercial and military applications it is essential to preserve the information theft in terms of both privacy and security of the data that flows through these wireless sensors networks. This rises because of the fact that most of the times these nodes are often placed in a hostile environments where they are not physically protected. Some security threats like Black hole attack, Sinkhole attack, Sybil attack are a notable concern. Among these attacks, one of them is Selective forwarding attack. In this attack malicious nodes behave like normal nodes and selectively drop packets containing certain messages. The selection of dropping nodes may be random. The objective behind writing this paper is to study these attacks and the challenges posed by them.
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