In this paper, a modified digital signcryption model has been proposed keeping in view the requirements of firewall signcryption. Based on this model, the security and efficiency of existing signcryption schemes that are presented over the years have been analyzed. The analysis shows that these schemes lack certain security attributes and violate the basic principles of firewall signcryption. Furthermore, a new signcryption scheme has been proposed that provides all essential security attributes and complies with all the requirements of firewall signcryption. The proposed scheme also has computational advantages over existing schemes. Since the construction of the proposed scheme is based on elliptic curve cryptography, it is also suitable for resource constrained applications.
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