Focusing on the problem that current dynamic trust aggregation algorithms searching for feedback trust information is based on trust chain in broadcast way
leading to slow in convergence and bad in scalability
a new scalable feedback trust information aggregation algorithm is proposed
in which the concept and definition of direct trust tree(DTT)are presented. Based on DTT a novel aggregating algorithm of scalable feedback trust information is proposed
and the DTT is constructed according to node's direct trust relation. Then
the feedback trust information is searched by using DTT instead of in broadcast manner. Two new parameters
quality factor and distance factor
are introduced to adjust the scale of aggregating computation automatically. Simulation results show that the algorithm remarkably enhances the convergence of feedback trust information aggregating computation. Moreover
it has better detecting capability against malicious feedback actions and has stronger robustness when the ratio of malicious nodes is increased.
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references
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