Správa důvěryhodnosti v bezdrátových ad hoc sítích

Abstract

Tato disertacni prace se zabyva problematikou duveryhodnosti v bezdratovych ad hoc sitich. Takoveto site jsou zranitelne zejmena kvuli absenci centralni spravy identit uzlu a pevne infrastruktury. Duvera v oblasti bezdratove komunikace se standardne resi nasazenim mechanismu vhodnych pro stanoveni duveryhodnosti jednotlivych uzlu. Hlavnmi ukoly disertacni prace jsou zobecneni pojmu duveryhodnosti a popis schemat tykajicich se moznosti jej spravy. Na zaklade stanovenych pozadavku byla navrzena nova metoda pro stanoveni duveryhodnosti. Tato metoda vyuzva matematicke modely, ktere jsou zalozeny na neuronovych siitich. Stanoveni duveryhodnosti uzlu vychazi z mereni hodnoty pomeru odeslanych a dorucenych paketu. Bylo prokazano, ze neuronove site jsou pro odhadovani duveryhodnosti uzlu v ad hoc sitich vhodne. Druha cast disertacni prace je venovana integraci konceptu duveryhodnosti do reaktivnch ad hoc smerovacich protokolu beze zmeny protokolu samotnych.

This dissertation deals with trust management in wireless ad hoc networks. These networks are vulnerable due to the absence of central management and xed infrastructure. Cooperation and communication challenges are frequently addressed by deploying a trust management scheme. This dissertation rst generalizes the notion of trust and then describes trust management schemes. Next, we developed a new method for managing trust in wireless ad hoc networks. The method is based on neural networks, and the packet delivery ratio is used to determine the trust of nodes. We demonstrated that neural networks are capable of trust estimation and evaluation in ad hoc networks. The second part of the dissertation describes a method integration into reactive ad hoc routing protocols without changes to the protocols themselves.