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Data secrecy is one of the key concerns for Wireless Body Sensor Networks (WBSNs). Usually, a data secrecy scheme should accomplish two tasks: key establishment and encryption. WBSNs generally face more serious limitations than general wireless networks in terms of energy supply. To address this, in this paper, the authors propose an energy efficient data secrecy scheme for WBSNs. On one hand, the proposed key establishment protocol integrates node IDs, seed value and nonce seamlessly for security, then establishes a session key between two nodes based on one-way hash algorithm SHA-1. On the other hand, a low-complexity threshold selective encryption technology is proposed.
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