WSNs are vulnerable against so many attacks. Attackers can
attack the radio transmission; add their own data bits to the
channel, replay old packets and any other type of attack. A
secure network ought to support all security properties. Attackers may deploy some malicious nodes in the
network with similar capabilities as of normal node or may
overwrite the memory of normal deployed node by capturing
them. Attacks in wireless sensor network are shown in Figure.
They are roughly categorized as follows:
A) Based on Routing
B) Based on Capability
C) Based on Protocol Layer
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