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Signcryption achieves both encryption and digital signature at the same time. The cost of the computations involved and the overheads involved in the communication is smaller than the conventional sign-then-encrypt method. Certificateless cryptosystem intends to solve the disadvantage of the identity-based cryptosystem: key escrow problem. It also simplifies the public key management. In this paper, an enhanced new certificateless signcryption technique is proposed by employing bilinear pairings. The scheme performance is also demonstrated to be more effective and efficient for smart devices. The proposed scheme fulfills public ciphertext verifiability and satisfies indistinguishability against adaptively-chosen ciphertext attacks. It is also immune to existential unforgeable against chosen message attacks.

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