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Wireless sensor network characteristics contain limited power to store, ability to withstand harsh environmental conditions, ability to cope with node failures, mobility of nodes, dynamic network topology, heterogeneity of nodes, communication failures and large scale of deployment. The traditional cryptographic protocol models are not suitable in low power sensor nodes due to inherent resource and computing constraints. Data traffic encryption heavily impacts to system performance on real-time processing. To provide security functionalities without decreasing network performance in the wireless sensor networks, a lightweight cryptographic protocol applicable to wireless sensor networks is needed. This paper presents the security functionalities of Binary CDMA technology which can be used to wireless personal area network, and classifies many of attack types, then defines the security requirements for binary CDMA sensor networks. With the security requirements, we design efficient cryptographic protocol corresponding to defensive countermeasures from adversaries. Our cryptographic protocol model has been designed to be practical use by utilizing binary CDMA security code in sensor networks.