A Provably Secure ID-Based Signcryption Protocol for Secure and Authentic Energy Efficient Communication

Abstract Singcryption was first proposed by Yuliang Zheng [1] in 1997, based on the construction of a shortened ElGamal-based signature scheme in parallel to authenticated encryption in a symmetric environment. Signcryption is a cryptographic primitive that enables the conventional two-step method of secure and authenticated message transmission or storage (sign-then-encrypt or encrypt-then-sign) to be done in a single step at a much lower computational cost than the traditional two-step approach. This article concentrates on designing a provably secure identity-based signcryption (IBSC) scheme. The user performs pairing-free computation during encryption in the proposed scheme, making it user-side effective. In addition, the IBSC structure is shown to be secure when dealing with modified bilinear Diffie-Hellman inversion (MBDHI) and modified bilinear strong Diffie-Hellman (MBSDH) problems. The proposed framework supports efficient communication, protection against chosen cipher attack, and existential unforgeability against chosen message attack, according to the performance review of IBSC with related schemes.