Secure privacy-preserving cloud-server-aided verification identity-based signature scheme for mobile devices

Advancements in cloud computing have brought server-aided verification (SAV) into the spotlight, allowing the outsourcing of complex verification tasks from power-constrained devices to cloud servers. Since then several SAV schemes have been proposed, however, the security and privacy of data cannot be guaranteed when outsourcing data to semi-trusted cloud servers. Therefore, according to these problems, we construct the first secure identity-based signature scheme with SAV in the standard model, and the scheme achieves secure data transmission between cloud and mobile devices. In addition, our scheme supports correctness, unforgeability and message privacy while maintaining efficiency. Theoretical analysis as well as experimental simulation reveals the fact that the proposed scheme is feasible and efficient.