Group Key Exchange Protocol Based on Diffie-Hellman Technique in Ad-Hoc Network

Abstract

During last decade, wireless ad hoc networks have been widely used for communication, transferring data or sharing some information for specific members.Nowadays security protocols play a fundamental role to provide a level of security for wireless local area networks (WLAN). Moreover, one of the most important issues to improve security by help of cryptography algorithms is generating a common key among participants to intercommunicate securely. The aim of thesis is creating a common secret key by means of Diffie Hellman (DH) technique, so the contributory group key exchange protocol is established in order to perform efficiently in context of ad hoc. To this aim, some analysis on Biswas's protocol (G. done. Tseng's protocol fails to establish a common key in some situations, when the key generated by DH technique is not invertible. Thus, it is modified in order to fix the problem and achieve better performance in view of the computational cost for the proposed Tseng's modified protocol. Furthermore, theoretical analysis shows that computational cost in Tseng's modified protocol for each participant and the controller is decreased about 1.5 and 3 times in comparison with Tseng's protocol respectively. Tseng modified protocol is implemented and is tested for ad hoc WLAN with 3, 4, and 5 nodes.

Leveraging Smart Contracts for Secure and Asynchronous Group Key Exchange Without Trusted Third Party

“…literature [2], [3]. One of the limitations of the synchronous schemes is that they require all the participants to be always online during the execution of the GKE protocol.…”