In this paper, a new method is proposed for image steganography that involves double encryption as well as compression of a message followed by its subsequent hiding in a digital image. The proposed method enhances bandwidth utilization besides ensuring three layered security to the message. The underlying principle of this method involves decomposition of each image-pixel into two blocks. One ...

We consider the allocation of Virtual Arrays (VAs) in a Heterogeneous Disk Array (HDA). Each VA holds groups of related objects and datasets such as files, relational tables, which has similar performance and availability characteristics. We evaluate single-pass data allocation methods for HDA using a synthetic stream of allocation requests, where each VA is characterized by its RAID level, dis...

Fiber wireless access (FiWi) network is a category of hybrid network, which cumulates the advantages of optical network and wireless network at frontend and backend respectively. FiWi is one of those networks which are capable of providing high bandwidth as well as great flexibility. In today’s world of high speed applications demand of spectrum is increasing rapidly, hence it becomes criticall...

The bandwidth reservation for multimedia traffic poses technical challenges due to bursty and delay sensitive nature of applications. The objectives of bandwidth reservation schemes are: optimize network utilization, minimize the packet losses and delays. The growth of multimedia services on Internet and the possible discovery of programmable networks has made us to investigate new techniques f...

By opening a number of concurrent parallel TCP flows, a node can achieve high utilization of available link bandwidth in high-bandwidth long-delay network without modification of TCP itself. However, parallel TCP flows are inherently unfair with respect to normal TCP flows. There have been several proposals to improve performance of parallel TCP flows. CM, COCOON, Fractional/Combined TCP, and T...

We study rate control of aggregated TCP connections, i.e., multiple TCP connections treated as a single aggregate for purposes of rate control, via traffic conditioning mechanisms such as traffic policing and shaping. This is a likely scenario given the current trends in policy-based service differentiation on the Internet (e.g., Differentiated Services) and content aggregation on the Web (e.g....

In Wireless Local Area Networks (WLANs), the unpredictable injection of traffic load and the limitations of DCF based bandwidth allocation may result in network congestion. Also the Quality of Service (QoS) of data flows with different priorities may not be strictly guaranteed. In order to support service differentiation and guarantee QoS of data transmission over WLANs, based on the extended L...

We propose a new policy for virtual path bandwidth allocation in broadband networks. Based on a threshold scheme, our policy handles the inherent tradeoo between bandwidth utilization and processing costs. In each virtual path controller the thresholds are chosen so as to keep bandwidth utilization high, while obtaining a low rate of processing requests. Two novel ideas are used in our threshol...

In order to solve problems such as low resources utilization of data center backbone bandwidth and expensive daily expenses caused by the tidal effect in the transition of large-scale network data, the new optimization method of bandwidth resource for bulk data transfer is proposed. This method finishes the bulk data transfer by taking full advantage of the idle channel bandwidth. Firstly, the ...

In WiMax networks the routing and the scheduling are tightly coupled. The routing and scheduling problem for WiMAX networks is different from 802.11 based mesh networks and can be designed and operated separately. Standard problems in wireless systems include Bandwidth allocation and Connection Admission Control (CAC). In this paper we design a joint routing, scheduling and admission control pr...