Resource Efficient Key Distribution System for Mantes
No Thumbnail Available
Date
2014-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Given MANET'slack of static network infrastructure, lack of resourceand the use of wireless medium for communication, its key management system is an excellent point of attack for intruders. By compromising on security and using sharedkeys to avoidthe burden of asymmetric key management for each node, vulnerabilityis created in the network. Different types of applications run on MANET’s. There are applications that may require hardened security like onsite emergency response applications and others which may not require hardened security like conference slide sharing applications. To ensure security for those applications that can’t afford a security vulnerability due to sharing of keys, a system should useasymmetric keys of which its private key is only known by the owner nodesand its identity confirmed by a certificate authority.
This work proposes a resource efficientasymmetric key distribution system for MANETs. We haveused decentralized trust model where each node, can act as a certificate authority and is able to cache certified keys. The system is also supported through clustering. It is able to do its intended task by having a key server, key client, cache builder and key cache modules installed on every node. Each node will perform its task based on the role assigned to it by the clustering algorithm. Since clustering algorithms have their own resource foot prints, we had to search for a clustering algorithm among that will not burden the network with extra cluster formation communication. We were able toexperimentallyselect a clustering algorithm called passive clustering algorithm that will not burden the network with its own clustering information exchange. This clustering algorithm uses existing traffic to maintain clustering information.
We have evaluated the proposed key distribution system by simulating and comparing its efficiency and key delivery rate against zone based key distribution system and MOCA key distribution system. The result showed that the proposed system was able to deliver keys 8.06 ms average end to end delay, 5.22 averagehop count and 71.33% key delivery rate, whereas zone based key distribution system scored 14.13 ms average end to end delay, 8.66 average hop count and 75.69% key delivery rate and finally MOCA scored 15.3 ms in average end to end delay, 10.42 hops in average hop count and 67.36% key delivery rate. The proposed key distribution was able to retrieve keys faster using less communication. This is because thekey caching capability of the proposed system improved the amount of communication needed to retrieve a key. The errors recorded in the key delivery rate were due to packet losses that occurred during wireless transmission.
Keywords: Key Distribution in MANETs, MANET Trust Model, Cryptography, MANET Security
Description
Keywords
Distribution in Manets; MANET Trust Model; Cryptography; MANET Security