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Securing Channel Access in Multi-Channel Ad Hoc Networks

The use of multiple orthogonal frequency bands (channels) has been demonstrated to increase network performance and reliability by substantially reducing contention and interference. However, for systems with poor physical security and lack of centralized resource allocation such as ad hoc, sensor, and cognitive radio networks, a multitude of internal and external attacks against the medium channel access mechanisms can negate any gains due to channelization. In this project, we design secure multi-channel access techniques, focusing on the protection of control traffic, collaborative attack detection, and uncoordinated medium sharing. Moreover, for networks with dynamic spectrum such as cognitive radio networks, we develop verifiable channel sensing and sharing methods. Central to this effort is our definition of quantitative security metrics under well defined adversarial models.