Selectively Secure Lightweight Strong Designated Verifier Signature Scheme from Identity-Based System

Abstract

In some special electronic applications like personal medical records, authenticity and privacy are considered the basic security requirements. A strong designated verifier signature (SDVS) scheme is applicable to the above scenarios. Such a scheme allows a signer to create a so-called designated signature which can only be verified by an intended verifier. Besides, the designated verifier has no way to transfer his conviction to any third party. It is thus can be seen that SDVS schemes play an important role in privacy-preserving applications. In this paper, we propose a lightweight SDVS scheme from identity-based systems. More specifically, our scheme owns lower computational costs as compared with previous mechanisms. Furthermore, the selective security against universal forgery attack is also realized in the random oracle model.