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Wireless sensor network is a technology that is growing faster in a decade or so. The data integrity of the WSN's is the critical part of data transmission. The data transmission is based on the request of the sensor nodes in return to the advertisement of the data from a source sensor node. Many algorithms are proposed for the integrity of the request (REQ) made by sensor nodes in order to protect the request. In this paper we propose an algorithm for providing security for data in wireless sensor networks. The data which is sent back to a sensor node in return to the request made by sensor node has to be integrated by some method to ensure data privacy. In this paper we make use of a well-known RSA cryptographic algorithm to encrypt data. This provides an integrity constraint for the data transmission in WSN'S.