Multicast Security in Mobile Ad Hoc Networks (Manet) 21121
Thus Pij can be considered as the direct reputation of node j )1(ReRe WhistPWhistprpijpij ij (6)
Where Repij-prev is reputation value that node i had for node j before incorporating themost recent satisfaction index. Whist is a constant that reflects the level of confidence that node i has in the pastobserved reputation for its neighbor j. The reputation index REPij is normalized using the following equation
)(max ijt
ij ij REP REP REP (7)
maxt is the function that reports the maximum observation of REPij over time.
3.2 Classifying the Nodes The nodes are categorized into two type’s namely strong and weak nodes. The stepsinvolved in selecting the nodes are as follows. 1) Each node deployed in the network periodically exchanges a HELLO packet with its neighbor nodes. 2) By exchanging the hello packets, every node measures the RSS, link quality andmobility Mj(i) of its neighbor nodes. (explained in section 3.1.1-3.1.2) 3) Based on the measurement of RSS, link quality and Mj(i), each node computes thestability index (SI) of its neighbor nodes (explained in section 3.1.3) and the values arestored in the neighbor table (NT). 4) The SI of each neighbor Ni is checked such that