Mobile Intelligence

18.4 SMRTI: ARCHITECTURE

In SMRTI, reputation is defined as an “opinion” held for another node, where the opinion is based on the evidence captured from the node's behavior and it is subjective. Trust is then defined as an “expectation” that a node will behave as predicted, and the factor influencing expectation is then the reputation of node. Hence, trust is subjective and the expectation applies only to a given context and time. Given that the expectation depends on the opinion, trust is expressed as a function of reputation in our model.

18.4.1 Overview

SMRTI asynchronously captures evidence for the trustworthiness of neighbors from passively monitored packets and through recommendations. The evidence is then quantified according to the examined neighbor's behavior and the context of event. Finally, the quantified evidence is represented as reputation rating to express the opinion held for examined neighbor.

In SMRTI, detection component handles the operation of capturing and quantifying evidence into reputation (Figure 18.1). It accomplishes the required operations through its modules—reputation capture and reputation evaluation, and data structures—packet buffer, reputation table, and reject list. The reputation capture module captures, quantifies, and represents evidence as reputation, while the reputation evaluation module aggregates recent reputation with previously held reputation to revise the opinion of examined neighbor. The evidence for modification attacks is captured ...