Some Identity Based Strong Bi-Designated Verifier Signature Schemes.
Sunder Lal, Vandani Verma · IACR Cryptology ePrint Archive · 2007
The problem of generalization of (single) designated verifier schemes to several designated verifiers was proposed by Desmedt in 2003. The paper proposes eight new Identity Based Strong Bi-Designated Verifier Signature Schemes in which the two designated verifiers may not know each other. The security and the computational efficiency of the schemes are also analyzed.