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Freshness is one of the most desired security properties of sensor network communication architecture. And sequence number is a common technique that is used as a freshness identifier to achieve freshness transmission. However, due to characteristics of wireless sensor network, such as resource-constrained and attack prone, it is vulnerable and energy-expensive to transmit sequence number directly. In this paper, the authors propose an Energy-efficient Freshness Transmission Protocol (EFTP) which lowers overhead as well as improves the security of sensor network. In EFTP, each sequence number is disarranged via a tree-architecture and further divided into two correlative parts. Encrypted and attached to messages, sequence number can be transferred securely.
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