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TRUST MANAGEMENT FOR DEFENDING ON-OFF ATTACKS

ABSTRACT

A trust management scheme can be used to aid an automated decision-making process for an access control policy. Since unintentional temporary errors are possible, the trust management solution must provide a redemption scheme to allow nodes to recover trust. However, if a malicious node tries to disguise its malicious behaviors as unintentional temporary errors, the malicious node may be given more opportunities to attack the system by disturbing the redemption scheme. Existing trust management schemes that employ redemption schemes fail to discriminate between temporary errors and disguised malicious behaviors in which the attacker cleverly behaves well and badly alternatively. In this paper, we present the vulnerabilities of existing redemption schemes, and describe a new trust management and redemption scheme that can discriminate between temporary errors and disguised malicious behaviors with a flexible design. We show the analytical results of the trust management scheme, and demonstrate the advantages of the proposed scheme with simulation conducted in a Wireless Sensor Network.

EXISTING SYSTEM	PROPOSED SYSTEM
EXISTING CONCEPT: - Trust management schemes aim to improve collaboration between the entities in a distributed system by predicting future behaviors of peers based on their previous behaviors. There exist trust management schemes that address On-off attack in various networks. However, no trust management scheme is able to discriminate between temporary errors and On-off attacks	PROPOSED CONCEPT: - The problem of identifying malicious node performs n good behaviors and m bad behaviors alternating, we refer to this as an nG-mB On-off attack. Uses a compilation of direct and indirect evaluations to reduce the trust of an On-off attacker to be lower than the trust of other neighboring normal nodes, so the network will detour around the On-off attack nodes in the system.
EXISTING TECHNIQUE:- Employ redemption schemes	PROPOSED TECHNIQUE:- Predictability Trust Based Redemption (PTR)
TECHNIQUE DEFINITION:- Employ redemption schemes fail to discriminate between temporary errors and disguised malicious behaviors in which the attacker cleverly behaves well and badly alternatively.	TECHNIQUE DEFINITION:- This is able to predict future trust values based on past behaviors with an efficient and flexible design. The goal of this scheme is threefold.
DRAWBACKS:- There are many trust management schemes that do not employ any redemption at all. Applying Trust In Such Systems Can Be Quite Complex.	ADVANTAGES:- The On-off attacker did not have an opportunity to continue its attack. We present a new efficient and flexible trust management scheme that detects and defends against On-off attacks.