A Secure and Fault-Tolerant Data Collection Scheme for Wireless Sensor Networks

• Main Authors: Shih-Chieh Tai, 戴士桀
• Other Authors: Jyh-Ming Huang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/98627993895459098642

碩士 === 逢甲大學 === 資訊工程所 === 97 === A critical security threat in wireless sensor networks (WSNs) is the compromise of sensor nodes. Not only can attackers use such vulnerability to eavesdrop on the dataflow, but could also inject bogus information into the networks. However, most current secure data collection schemes trade fault-tolerant ability for end-to-end protection, thus with poor performance. This paper proposes SFDCS, a secure and fault-tolerant data collection scheme for wireless sensor networks. For increasing the data delivery ratio, SFDCS divides the sensing area into a radar graph with the sink at the center of area. Sensing data would be sent from the source nodes with a 3-way forwarding approach to reach the BS, thus enhances its fault-tolerance capability. In addition, a key combined with multiple keys is used by each node to provide end-to-end data authentication/encryption. By this way, the probability of encryption key discovered by attackers can be reduced. Furthermore, to decrease the number of re-key messages, EBS has also been applied to manage the keys stored in each sensor node. Lastly, in SFDCS, the key server is also periodically migrated to or reconstructed on other nodes, which is useful if the server is either out of energy or compromised. In order to compare SFDCS to LEDS and RKPS, we use C programs to simulate the performance of SFDCS on different situations. We analyzed the data confidentiality of SFDCS. Due to using multiple keys to encrypt messages, our proposed SFDCS scheme can achieve about 33%~60% improvement on data confidentiality than LEDS in different sizes of group. We also simulated the data availability of SFDCS on the cases that attackers are confined to attacking some groups. Because SFDCS uses a 3-way forwarding approach to report data to BS, it can achieve 27% improvement on data availability than LEDS. All simulation results demonstrate that the proposed SFDCS is superior to other existing schemes, in terms of data confidentiality and data availability.