A secure channel between a sensor node and internet host is created, hence new security challenges arises and wireless sensor networks is integrated into internet of things. The authors use heterogeneous online/offline signcryption scheme so that secure communication is provided. They use bilinear diffie-hellman inversion problem in random oracle model, it provides indistinguishability against adaptive chosen ciphertext attacks and existential unforgeability against adaptive chosen messages attacks. In offline phase heavy computations are carried out and in online phase light computations are done. This scheme is suitable to provide security solution for integrating WSN into the IoT. They use the concept of cellular communication and use implement for an industrial application.