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In this paper, we present a strong universal designated multi verifier signature scheme based on bilinear pairings, which does not resort to random oracles. The security of the proposed scheme relies on the hardness of solving q-Strong Diffie-Hellman problem. The proposed scheme is more efficient than the existing universal designated multi verifier(More)
Key issuing protocols deal with overcoming the two inherent problems: key escrow and secure channel requirement of the identity based cryptosystems. An efficient key issuing protocol enables the identity based cryptosystems to be more acceptable and applicable in the real world. We present a secure and efficient threshold key issuing protocol. In our(More)
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