Non-delegatable Identity-based Designated Verifier Signature

Designated verifier signature is a cryptographic primitive which allows a signer to convince a designated verifier of the validity of a statement but in the meanwhile prevents the verifier from transferring this conviction to any third party. In this work we present the first identity-based designated verifier signature scheme that supports non-delegatability, and prove its security in the random oracle model, based on computational Diffie-Hellman assumption. Our scheme is perfectly non-transferable, and its non-delegatability follows the original definition proposed by Lipmaa et al. [21].