Recently, various services providing various contents using them have emerged while mobile devices such as smartphone has spread widely. As a result, network traffics are increasing rapidly and various problems such as QoS degradation have occurred. P2P is the technique that can reduce network bandwidth and computing resources. P2P technique in a wireless network environment gained a lot of popularity and MANET-based P2P technique among them has been studied actively. However, MANET has many problems by a stable connectivity between nodes and low bandwidth because it is consisted of only mobile nodes. In this paper, we proposed a hierarchical sharing group configuration techniques in order to provide a stable connection between the mobile nodes and reduce the load of network traffic and overhead of sharing group reconfiguration. Sharing Group Member Node was applied sub-sharing group generation techniques with neighboring nodes of 1-hop distance to reduce traffic for file sharing. We did comparative experiment with PDSR technique to evaluate the performance of proposed technique and confirmed the excellent performance by experiments.

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As the digitization of information is advanced, the case which keeps inside the digital information machinery and tools where the important evidence or beginning are included is increasing in computer related crime and also general crime. The digital organization standardized the process of digital forensic in the investigation office and the cyber crime investigation which applies the various equipments(S/W, H/W) is being activated.But the specialist discernment is necessary for equipment (S/W and H/W) application and the actual condition is that the evidence management and joint ownership are restricted. As it is able to approach in the case of the non specialist easily and a corroborative fact data application degree is raised through the connection of the investigation office (prosecution, police) & the financial institution (the bank, insurance and the securities) and the necessity of the near search using a mining & the digital forensic evidence management system is proposed, we would like to propose the prototype of digital evidence management system for the efficient cyber crime investigation through this research.