Provable Secure Identity Based Generalized Signcryption Scheme

TL;DR

This paper introduces a new identity-based generalized signcryption scheme with a comprehensive security model, demonstrating improved implementation simplicity and comparable computational efficiency to existing schemes.

Contribution

It presents a novel security model for identity-based generalized signcryption and proposes a scheme with proven security and reduced complexity.

Findings

Security model is more complete than previous models.

The new scheme has less implementation complexity.

Computational complexity is comparable to existing signcryption schemes.

Abstract

According to actual needs, generalized signcryption scheme can flexibly work as an encryption scheme, a signature scheme or a signcryption scheme. In this paper, firstly, we give a security model for identity based generalized signcryption which is more complete than existing model. Secondly, we propose an identity based generalized signcryption scheme. Thirdly, we give the security proof of the new scheme in this complete model. Comparing with existing identity based generalized signcryption, the new scheme has less implementation complexity. Moreover, the new scheme has comparable computation complexity with the existing normal signcryption schemes.