Ajaz Hussain Mir – författare

Master's Thesis from the year 2013 in the subject Computer Science - Internet, New Technologies, grade: 8.12, , course: M. Tech, language: English, abstract: Wireless sensor network (WSN) is an emerging imperious leading technology of the current century that presents great promise for various pioneering applications. The use of sensor networks should keep developing, mainly in the fields of scientific, logistic, healthcare and military applications. Sensor networks interact and collect sensitive data and operate in unattended hostile environments, thus it is imperative to pay attention to the security of wireless sensor networks as they are highly prone to threats. For successful operation of the nodes, it is important to maintain the security and privacy of the transmitted data as well as the data stored at nodes. The different security protocols and models used in the wired and other wireless networks such as ad-hoc networks cannot be used in WSNs because the sensor size poses significant restrictions, mainly in terms of energy autonomy and node lifetime, as the batteries have to be too tiny. Also, the existing security protocols in these constrained networks are not sufficiently energy efficient, which is the real motivation behind this work. In this thesis, a light-weight dynamic security algorithm titled An Energy Efficient and Dynamic Security Protocol (EEDSP) for wireless sensor networks has been proposed and implemented at nodal level. We also implement an existing algorithm and then carry out the performance analysis of both the algorithms in terms of energy consumptions, node lifetime and memory requirements at source and intermediate nodes to verify the improvement in our protocol s results.

Document from the year 2016 in the subject Computer Science - Internet, New Technologies, , language: English, abstract: Due to the rapid evolution of Internet as well as services over the Internet, including high bandwidth consuming applications like audio and video streaming, it has become need of the day to enhance the Internet infrastructure for bandwidth efficiency. One of the present day biggest challenges of networks is the audio/video transmission in real time. Developed by the Internet Engineering Task Force, Multiprotocol label Switching (MPLS) allows networks to offer several services on the single network architecture with improved forwarding speed of routers by solving the problem of longest prefix match in IP networks. Internet Protocol datagram encapsulates payload received from above layer and adds to its own header information. Thus each protocol layer adds its own header with the information related to the layer. This is a disadvantage of a bigger packet header size such as IPv4/UDP/RTP header of 40 bytes compared to the payload size which leads to excessive overhead in case of real-time multimedia applications. Bandwidth can be conserved by reducing the amount of redundant IP header transmitted with every packet for the same packet stream through header compression techniques. The header compression mechanisms have several short comings such as a problem that they work on hop-by-hop basis. The packet is compressed by the compressor and decompressed by the decompressor and for header compression to work; these are connected directly not through any intermediate node, not even a layer 3 device such as a router. In addition to this, there is a limit in the number of compressed flows that a router can take. The objective of this book is to propose header compression technology which can be implemented over MPLS and used as a bandwidth conserving technology. This will solve the problems of hop-by-hop compression/decompression as the compression of packets is not hop-by-hop rather the compression is per Label Switched Path (LSP) of MPLS network from ingress to egress Label Switched Routers. This will also handle packet reordering in addition to allowing numerous flows at the same time. The current work in the area, both standardized as well as ongoing research has been discussed in detail and also the problems that are yet to be addressed are examined. This approach also increases the bandwidth efficiency as well as processing scalability with respect to the maximum number of simultaneous flows.