Abstract- In this paper we evaluate the energy and security consideration for a security-aware routing protocol proposed for uni-directional, hierarchical optical sensor network. We bootstrap the unconstrained resources of the base station to design GORA, a greedy optimized routing algorithm, in which the base station is responsible for network route optimization and updates. This paper extends our recent work on OPSENET, a novel and efficient protocol that facilitates secure routing in directional optical sensor networks. We evaluate security and energy metrics for our scheme proposed scheme. Analysis and simulation results are used to show the performance of our algorithm, compared with other hierarchical bi-directional clustering routing schemes. I.

This paper provides a brief overview of recent progress of peer-to-peer (P2P) technologies for multimedia applications. We provide an overview of the technical challenges, creative solutions and results related to P2P file sharing and content search, and P2P media streaming. 1.

Abstract — We study the problem of integrated topology control and routing in Free Space Optical (FSO) mesh backbone networks. FSO links are high-bandwidth, low interference links that can be set-up very fast, making them suitable for mesh networking. FSO networks are highly constrained by interface constraints, i.e., constraints on the number of FSO links a node can establish. We prove the problem to be NP-Hard and propose efficient algorithms for integrated topology control and single-path or multi-path routing.

efficient protocol that facilitates secure routing in directional optical sensor networks. We show that even though the unidirectionality of links in an optical sensor network (OSN) complicates the design of efficient routing, link directionality actually helps security in our network setup. In particular, we leverage the naturally-occurring clustering that results from passive (bi-directional) communication of select cluster head nodes with the base station, to improve overall network performance. This paper presents two main contributions: (1) We introduce OPSENET, a novel secure cluster-based routing algorithm for base station circuit discovery in OSNs. In order to support the efficient utilization of a nodes ' resources, we employ symmetric cryptography in the design of OPSENET, using efficient oneway hash functions and pre-deployed keying. OPSENET achieves base station broadcast authentication, per-hop authentication, and cluster group secrecy, without requiring any time synchronization. (2) We analyze the relevance of traditional routing attacks on OSNs, and show that OPSENET is robust against uncoordinated (non-smart) insider routing attacks, amongst other compromises. An important performance metric of OPSENET is its low byte overhead, and graceful degradation with the number of compromised nodes in the network. To the best of our knowledge, this is the first paper to consider secure routing in an OSN network scenario. I.

This paper introduces a novel “HoLiSTiC ” framework for visual sensor networks (VisSNs) and studies security issues within this context. The HoLiSTiC paradigm, which encompasses many existing VisSN proposals, effectively exploits heterogeneous wireless sensing and communications for more flexible, practical and scalable visual surveillance. Security aspects of HoLiSTiC are considered by highlighting open research problems. Secure routing issues in unidirectional optical free-space sensor networks that form the foundation of the HoLiSTiC transport network are discussed. In addition, a novel distributed security paradigm based on independent media sharing is presented to demonstrate how the interaction of signal processing, networking, and cryptography can benefit VisSNs. 1

Abstract — Connectivity is a crucial requirement for wireless sensor network deployments. Without being able to guarantee a reasonable level of connectivity, many critical network operations may not be possible. Traditionally, omni-directional antennas have been used for communication in wireless sensor networks. In this paper, we analyze the effects on connectivity when a hybrid approach towards antennas is employed, by using both omni and sectorized uni-directional antennas. We present results that help understand the relationship between node density, transmission radius, uni-directional antenna beam width and network connectivity. We demonstrate that, under a broad class of conditions, a hybrid sectorized approach drastically improves connectivity and reaches higher probabilities of 100 % connecitivity at much smaller node densities and transmission radii. We also suggest neighborhood management procedures for a hybrid approach and comment on the costs involved in practically implementing our paradigm. I.

under our supervision by