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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39866 (19)
- University: Sharif University of Technology
- Department: Computer Engineering
- Advisor(s): Jahangir, AmirHossein
- Abstract:
- Wireless sensor networks have many applications, vary in size, and are deployed in a wide variety of areas. They are often deployed in potentially adverse or even hostile environment so security issues are of much concern in these networks. Key management is a fundamental security issue in sensor networks. In this thesis, we are mainly focusing on key establishment and group rekeying schemes aspects of key management. Due to limited resources of sensor networks, key pre-distribution schemes are currently viewed as the most promising solution. Key predistribution in sensor networks refers to the problem of distributing secret keys among sensor nodes prior to deployment. Recently, many key predistribution schemes have been proposed for wireless sensor networks. To further improve these techniques, researchers have also proposed to use sensors’ expected location information to help predistribution of keying materials. In this thesis, we propose a lightweight and scalable key establishment scheme for GPS-enabled wireless sensor networks. This scheme has little communication overhead and memory usage. Since communications and computations of key establishment schemes are done only once and when the network is begin initiated, actually the most important overhead is the memory usage. In our proposed scheme, only nine keys should be stored in sensor’s memory. This scheme also provides high local connectivity. We have studied the performance of this scheme using simulations and analysis. With the same memory usage, our scheme has lower overhead comparing to other schemes. In applications which requires group communication and clustering, there is usually a single key for all members of the group. This key should be updated in order to support dynamic nature of the groups and also to handle possible node compromise attack. In this thesis, we also propose a new distributed group rekeying scheme that is based on local collaboration of group members. This scheme, in contrast to centralized schemes, does not require a centralized rekeying server, so the rekeying process is handled locally in the group itself. Hence, it is more practical and also it has lower communication overhead. The security of this scheme is analyzed. We have implemented this scheme for TinyOS, and have used Avrora to measure the power consumption of our scheme in MICA2 motes. Comparing to the only published distributed rekeying scheme, our proposal has less communication and computation overhead. It also has lower power consumption
- Keywords:
- Security ; Sensor Network ; Key Management ; Rekeying
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