Category Archives: Conference Paper

Risk of attack coefficient effect on availability of adhoc networks

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Abstract:
Security techniques have been designed to obtain certain objectives. One of the most important objectives all security mechanisms try to achieve is the availability, which insures that network services are available to various entities in the network when required. But there has not been any certain parameter to measure this objective in network. In this paper we consider availability as a security parameter in ad-hoc networks. However this parameter can be used in other networks as well. We also present the connectivity coefficient of nodes in a network which shows how important is a node in a network and how much damage is caused if a certain node is compromised.

Risk of attack coefficient effect on availability of adhoc networks

Secure Multipath Adaptive Routing Protocol

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Abstract
Locally multipath adaptive routing (LMAR) protocol, classified as a new reactive distance vector routing protocol for MANETs is proposed in this paper. LMAR can find an ad-hoc path without selfish nodes and wormholes using a random search algorithm in polynomial-time. Also when the primary path fails, it discovers an alternative safe path if network graph remains connected after eliminating selfish/malicious nodes. The main feature of LMAR to seek safe route free of selfish and malicious nodes in polynomial time is its searching algorithm and flooding stage that its generated traffic is equiloaded compared to single-path routing protocols but its ability to bypass the attacks is much better than the other multi-path routing protocols. LMAR concept is introduced to provide the security feature known as availability and a simulator has been developed to analyze its behavior. Efficiency of the route discovery stage is analyzed and compared with the previous algorithms.

Locally Multipath Adaptive Routing Protocol Resilient to Selfishness and Wormholes

Extended Authentication and Key Agreement Protocol

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Abstract
Identification, authentication and key agreement protocol of UMTS networks have some weaknesses to provide DoS-attack resistance, mutual freshness, and efficient bandwidth consumption. In this article we consider UMTS AKA and some other proposed schemes. Then we explain the known weaknesses in the previous frameworks suggested for UMTS AKA protocol. After that we propose a new UMTS AKA protocol (called EAKAP) for UMTS mobile network that combines identification stage and AKA stage of UMTS AKA protocol as well as eliminating disadvantages of related works and bringing some new features to improve the UMTS AKA mechanism such as reducing the interactive rounds of the UMTS AKA protocol.

Extended Authentication and Key Agreement Protocol of UMTS