Attacks in Opportunistic Networks?

MANET is an infrastructure based network in which nodes can be moved easily. It has one sub category also known as opportunistic network networks. All nodes are work on store and carry scheme in it. This network has some security issues. Malicious node can easily trigger attacks on this network. In this paper we will be discussed about various types of attack in an opportunistic network. The main problem which is faced in this network will also be discussed.