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International Indexed & Refereed Research Journal, ISSN 0974-2832, (Print), E-ISSN- 2320-5474, July, 2013 VOL-V * ISSUE -54

Research Paper -Computer Science

A Secure Group Communication Architecture for a Mobile Communication Networks * Mr. Hardik Doshi

July, 2013 * Ph.D Student, Department of Computer Science, Saurashtra University, Rajkot. 3. Multicast group join Introduction In Mobile Ad Hoc Networks (MANETs) has 4. Packet sending from the source become one of the most prevalent areas of research in 5. Multicast data forwarding the recent years because of the challenges it pose to Module Description: the related protocols. MANET is the new emerging 1. Efficient Geographic Multicast Protocol EGMP supports scalable and reliable memtechnology which enables users to communicate without any physical infrastructure regardless of their geo- bership management and multicast forwarding through graphical location, that's why it is some-times referred a two-tier virtual zone- based structure At the lower to as an "infrastructure less" network. The prolifera- layer, in reference to a pre-determined virtual origin, the tion of cheaper, small and more powerful devices make nodes in the network self-organize themselves into a MANET a fastest growing network. An ad hoc network set of zones and a leader are elected in a zone to manage is self organizing and adaptive. Device in mobile ad hoc the local group membership. At the upper layer, the network should be able to detect the presence of other leader serves as a representative for its zone to join or devices and perform necessary set up to facilitate com- leave a multicast group as required. As a result, a netmunication and sharing of data and service. Ad hoc work-wide zone-based multicast tree is built. For effinetworking allows the devices to maintain connec- cient and reliable management and transmissions, lotions to the network as well as easily adding and remov- cation information will be integrated with the design ing devices to and from the network. The set of appli- and used to guide the zone construction, group memcations for MANETs is diverse, ranging from large- bership management, multicast tree construction and scale, mobile, highly dynamic networks, to small, static maintenance, and packet forwarding. networks that are constrained by power sources. Be- 2. Construction of Multicast Tree We present the multicast tree creation and sides the legacy applications that move from traditional infrastructure environment into the ad hoc con- maintenance schemes. In EGMP, instead of connecting text, a great deal of new services can and will be gen- each group member directly to the tree, the tree is formed in the granularity of zone with the guidance of erated for the new environment. It includes: location information, which significantly reduces the 1. Military Battlefield tree management overhead. With a des-tinationlocation, 2 Sensor Networks a control message can be transmitted immediately with3. Medical Service out incurring a high overhead and delay to find the path 4. Personal Area Network. Security solutions are important issues for first, which enables quick group joining and leaving. MANET, especially for those selecting sensitive appli- 3. Multicast group join When a node M wants to join the multicast cations, have to meet the following design goals while group G, if it is not a leader node, it sends a JOIN addressing the above challenges. MANET is more vulnerable than wired network due to mobile nodes, REQ(M; PosM; G; fMoldg) message to its zLdr, carrythreats from compromised nodes inside the network, ing its address, position, and group to join. The adlimited physical security, dynamic topology, scalability dress of the old group leaderMold is an option used and lack of centralized management. Because of these when there is a leader handoff and a new leader sends vulnerabilities, MANET are more prone to malicious an updated JOIN REQ message to its upstream zone. If attacks. The primary focus of this work is to provide a M did not receive the NEW SESSION message or it just survey on various types of attacks the affect the joined the network. 4. Packet sending from the source MANET behavior due to any reason. After the multicast tree is constructed, all the Modules: sources of the group could send packets to the tree and 1. Efficient Geographic Multicast Protocol the packets will be forwarded along the tree. In most 2. Multicast Tree Construction



International Indexed & Refereed Research Journal, ISSN 0974-2832, (Print), E-ISSN- 2320-5474, July, 2013 VOL-V * ISSUE -54

tree-based multicast protocols, a data source needs to send the packets initially to the root of the tree. If this scheme is used and node 5 is a source, node 5 needs to uni-cast the packets initially to root zone (2, 2). The sending of packets to the root would introduce extra delay especially when a source is far away from the root. 5. Multicast data forwarding Maintain the multicast table, and the member zones normally cannot be reached within one hop from the source. When a node N has a multicast Packet to forward to a list of destinations (D1; D2: D3; :), it decides the next hop node towards each destination (for a zone, its center is used) using the geographic forwarding strategy. After deciding the next hop nodes, N inserts the list of next hop nodes and the destinations associated with each next hop node in the packet header. An example list is (N1: D1; D3; N2: D2; :), whereN1 is the next hop node for the destinations D1 and D3, and N2 is the next hop node for D2. Then N broadcasts the packet promiscuously (for reliability and efficiency) Objectives of the study: The existing geographic routing protocols generally assume mobile nodes are aware of their own positions through certain positioning system (e.g., GPS), and a source can obtain the destination position through some type of location service. In, an intermediate node makes its forwarding decisions based on the


destination position inserted in the packet header by the source and the positions of its one-hop neighbors learned from the periodic beaconing of the neighbors. By default, the packets are greedily forwarded to the neighbor that allows for the greatest geographic progress to the destination ODMRP are proposed to enhance the robustness with re use of redundant paths between the source and the destination pair's scalability due to the overhead incurred for roiae searching, group membership management, and creation and maintenance of the tree/mesh structure over the dynamc MANET. Conclusions There is an increasing demand and a big challenge to desc-more scalable and reliable multicast protocol over a dynamc ad hoc network (MANET). In this paper, we propose an efficient and scalable geographic multicast protocol, EGMP for MANET. The scalability of EGMP is achieved through a two-tier virtua-zonebased structure, which takes advantage of the geome'ric information to greatly simplify the zone management anfl packet forwarding. We make a quantitative analysis on re control overhead of the proposed EGMP protocol and our results indicate that the per-node cost of EGMP keeps relative-i constant with respect to the network size and the group size We also performed extensive simulations to evaluate the performance of EGMP.

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