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... the network is deployed. A unique issue that arises in sensor networks that needs to be considered while selecting a key sharing approach is its impact on the effectiveness of in-network processing [=-=Karlof et al. 2004-=-]. In many applications, sensors in the network are organized into a data fusion or aggregation hierarchy for efficiency. Sensor readings or messages from several sensors are processed at a data fusio...

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...aged. We conjecture that concepts such as virtual walls [25] can be used when deciding what information to reveal in real time via the back end or to peer BANs. Light-weight encryption (e.g., TinySec =-=[24]-=-, MiniSec [23]) may used for intra-BAN communications and to protect against data prying on the part of mules. 5 Conclusion In this paper, we have presented the detailed design, implementation and eva...

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... by MetroSense, protecting the security and privacy of the sensor tasking and data collection processes is of great importance. Initial work on providing security for static sensor meshes (e.g., [28] =-=[29]-=-) provides promising leads, but many open problems exist. Characteristics of sensing in the urban environment such as mobility and issues related to interactions across multiple administrative domains...

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...D}<Kenc,C>, MAC (Kmac,C|{D}<Kenc,C> )sHere Kenc, the key used for encrypting the data and Kmac, the key used to generate the MAC are both generated fromsthe shared master secret key.sTinySec: TinySec =-=[KAR04a]-=- is a link layer security protocol that provides data authentication, data integrity, datasconfidentiality and even semantic security. In-network processing is highly important in sensor networks insp...

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...clude effective congestion management, reliable networking, and security. In the following section we present background on medical sensor networks and discuss related work. In Section 3 we detail our medical sensor hardware designs. Section 4 describes the CodeBlue protocol architecture and prototype implementation. In Section 5 we present initial results evaluating the performance of the CodeBlue system on our 30-node indoor sensor network testbed. Finally, Section 6 discusses future work and concludes. 2 Motivation and Background Medical care is an oft-cited application for sensor networks [29, 11]. The ability to augment medical telemetry with tiny, wearable, wireless sensors would have a profound impact on many aspects of clinical practice. Emergency medical care, triage, and intensive care can all benefit from continuous vital sign monitoring, especially immediate notification of patient deterioration. Sensor data can be integrated into electronic patient care records and retrieved for later analysis. In a wide range of clinical studies, especially those involving ambulatory or at-home monitoring, wireless sensors would permit data acquisition at higher resolution and for longer dura...

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...tion. These modes are selectable on a per-message basis, allowing application-level decisions about security policy based on message semantics or context, which is more flexible than other solutions (=-=[20, 21]-=-). Len 802.15.4 Header None: Auth: Encr: Auth+Encr: TOS Header M Payload M|K Source M|K Source Counter Payload M|K Source Counter Payload Payload Payload MAC MAC FCS Figure 7. Message format for the S...

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... and pragmatic analysis of the security of a real, commercial device. There is also a body of research studying wireless security in low-power environments, especially in the areas of sensor networks =-=[13]-=-, [23] and wireless body area networks [32]. In contrast with these works, our zero-power security approaches eliminate the stored-energy overhead of cryptography. Chae et al. [2] also used RF power t...