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This book constitutes the thoroughly refereed post-conference proceedings of the 4th International ICST Conference on Sensor Systems and Software, S-Cube 2013, held in Lucca, Italy, 2013. The 8 revised full papers and 2 invited papers presented cover contributions on different technologies for wireless sensor networks, including security protocols, middleware, analysis tools and frameworks.

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Improving Key Negotiation in Transitory Master Key Schemes for Wireless Sensor Networks.- Resilient Double Weighted Trust based (REDWEST) WSN using SAX.- Over potential-based Battery End-of-Life Indication in WSN Nodes.- Definition and Development of a Topology-based Cryptographic Scheme for Wireless Sensor Networks.- Smart Fence: Decentralized Sequential Hypothesis Testing for Perimeter Security.- Underwater Sensor Networks with mobile agents: experience from the field.- IRIS: A Flexible and Extensible Experiment Management and Data Analysis Tool for Wireless Sensor Networks.- Enabling High-Level Application Development in the Internet of Things.- Comparative LCA Evaluations between Conventional Interventions and Building Automation Systems for Energetic Requalification Activities.- RAISE: RAIlway infrastructure health monitoring using Wireless Sensor Networks.

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