A Pairing-Less Identity-Based Blind Signature with Message Recovery Scheme for Cloud-Assisted Services

Abstract

The rapid growing big data enforces many organizations to shift their data and services like digital right management, e-payment, and e-voting systems to the cloud. In such cloud-assisted services, the blind signature scheme could be one of the cryptographic tools, which provides the integrity of data and user anonymity. It allows the user to ask the signer for signing on message without disclosing any information about the content to the signer. Since several blind signature schemes have been proposed, but due to the expensive computation and bandwidth cost, they are impractical for the cloud-assisted as well as Internet-based environment. In this paper, we propose a new provable secure identity-based blind signature scheme with message recovery (IDBS-MR) using the elliptic curve cryptography. The proposed IDBS-MR scheme does not transmit the message with the signature while the message is recovered during verification round; hence it has the least message-signature length. The security analysis shows that the proposed IDBS-MR scheme is secured against existential forgery attack under the adaptive chosen message and ID attacks (EF-ID-CMA) under the assumption of solving the ECDL problem, and random oracle model (ROM) and achieves blindness property. The performance analysis shows that our scheme is efficient as compared to related existing schemes.