Confidential and Secure Broadcast in Wireless Sensor Networks

Wireless sensor networks need broadcast for operations such as software updates, network queries, and command dissemination. Alongside ensuring authenticity of the source and data, keeping the broadcast data secret is vital in certain applications such as battlefield control, emergency response, and natural resource management. In this paper, the authors propose and prototype a mechanism for ensuring confidentiality and authenticity of broadcast data in single-hop networks, and discuss possible extensions to multi-hop settings. Their scheme uses known low-complexity symmetric encryption techniques for confidentiality, while changing the encryption key on a per-packet basis in a verifiable but non-forgeable way to ensure authenticity.