Wireless Communication

L. Jai Vinita ¹, S. Punitha ², S. Thompson ³

Affiliations
1 VNRVJIET, Hyderabad, IN
2 ASET, New Delhi, IN
3 Vel Tech, Chennai, IN

Abstract

Cooperative caching in ad-hoc networks are currently receiving much attention as a means of sharing and distributing information. However, open nature of these networks offers an almost ideal environment for the spread of self-replicating inauthentic files. In this paper we propose a reputation system called Adaptive Hybrid Reputation System (AHRS) for Cooperative caching in MANETS to decrease the number of inauthentic data or path retrieves. This system assigns each node a unique global trust value, based on the nodes history of uploads. Then we present a distributed and secure method to compute global trust values, by aggregating the local trust values from the trusted nodes. By having nodes use these global trust values to choose the nodes from whom they retrieve the data or path, the network effectively identifies malicious nodes and isolates them from the network. In simulations, this reputation system, called Adaptive Hybrid Reputation System, has been shown to significantly decrease the number of inauthentic data on the network, even under a variety of conditions where malicious nodes cooperate in an attempt to deliberately subvert the system.

Keywords

Ad-Hoc Networks, Reputation System, Node Download, Inauthentic Node.

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S. Punitha ¹, S. Thompson ²

Affiliations
1 Amity School of Engineering and Technology, Bijwasan, New Delhi, IN
2 VelTech MultiTech Dr.Rangarajan Dr.Sahunthala Engineering College, Avadi, Chennai, IN

Abstract

In this paper we propose a Novel scheme Hybrid Cooperative (HC) based on two cooperative caching Schemes DataCache and PathCache. In ad hoc networks, the movement of mobile hosts occurred frequently and may cause disconnection and the final result will lead to network division. A common technique used to improve the performance of data access is caching.  HC Scheme adjusts itself to the ad hoc network environment to provide best cache performance. It works to overcome the demerits of DataCache and PathCache schemes. It works based on different factors like cache size, size of the data, node density, Consistency of data based on TTL. As a part of Cache management a Cache Replacement Policy FDS which is based on the frequency of the data used , Distance of the data and Size of the data has been developed. Simulation results shows that HC scheme achieves significant improvement in terms of average delay when compared to other caching schemes.

Keywords

Ad-hoc Networks, Cache Management, Cache Replacement Policy, Data Dissemination.

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