Research Paper Summary-Engg. Branch (CS)
Title: A Fault
Tolerant, Secure and Distributed Group Key Diffie Hellman Key
Exchange Protocol for Mobile Adhoc
Networks
National conference on “Advances in Computer Networks and
Information Technology (NCANIT)”
1.
Abstract
A mobile adhoc network (MANET) is a
Multi hop wireless network capable of autonomous operation and requiring no
infrastructural support. The purpose of an adhoc network is to set up possibly
a short lived network for a collection of nodes. Security in mobile adhoc
networks is difficult to achieve notably because of vulnerability of wirelees
links, limited physical protection of nodes, dynamically changing topology, absence
of certification authority and lack of centralized monitoring or management
point.
In this paper they present,
design and implementation of a A Fault
Tolerant, Secure and
Distributed Group Key Diffie Hellman (FASED-GDH) Key Exchange
Protocol which is a n-party generalization of the basic two party
Diffie-Hellman Protocol for key exchange. FASED-GDH is a ring based protocol in
which each peer contribute its partial factor for the final establishment of
secure session key. The protocol provides a secure multicast of pseudo final
key leading to an inbuilt intrusion detection system. The protocol is simple as
compared to previous approaches. Failure of a subset of nodes leaves the system
unaffected, thereby proving its robustness and fault tolerance.
2.
Introduction
Group Key Diffie Hellman
protocol provides both the things: it uses public key technique to allow the
exchange of a private encryption key. It is an Authenticated Key Exchange
protocol which is designed to provide a pool of players with a shared secret
key which may later be used. For example: to achieve multicast message
integrity.Over the years the several schemes have been proposed. However no
formal treatment for cryptographic problem is suggested. In this paper, they
present a security model, FASED-GDH, for this problem and use it to precisely
define AKE as the fundamental goal. In AKE, each player is assured that no
other player aside from the arbitrary pool of players can learn any information
about the session key.They then define in this model the execution of an
authenticated group Diffie-Hellman scheme and prove its security.
3.
System Model
In FASED-GDH they have
assumed a session of adhoc network which consist of a collection of nodes or
peers that need a secret secure session key to start the communication. The
system design for this establishment of key is as follows:
Each peer can act as both
client and server. Any peer who wants to start the communication named Init
Server sends its contribution to its neighbor, the neighbor add its
contribution and then sends the combined result to its neighbor.
This process goes on till
the final establishment of key. Now the destination server will not send this
final key to remaining peers instead it send their partial factor to the
corresponding peers which then further add their own private factor for the
final establishment of key.
