  In Wireless sensor networks (WSNs), All communications between different
nodes are sent out in a broadcast fashion. These networks are used in a variety
of applications including military, environmental, and smart spaces. Sensors
are susceptible to various types of attack, such as data modification, data
insertion and deletion, or even physical capture and sensor replacement. Hence
security becomes important issue in WSNs. However given the fact that sensors
are resources constrained, hence the traditional intensive security algorithms
are not well suited for WSNs. This makes traditional security techniques, based
on data encryption, not very suitable for WSNs. This paper proposes Linear
Kolmogorov watermarking technique for secure data communication in WSNs. We
provide a security analysis to show the robustness of the proposed techniques
against various types of attacks. This technique is robust against data
deletion, packet replication and Sybil attacks
