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Multi-proxy signature is a scheme that an original signer delegates his or her signing capability to a proxy group.In the scheme,only the cooperation of all proxy signers in the proxy group can create a signature on behalf of the original signer.Jin and Wen firstly defined the formal security model of certificateless multi-proxy signature(CLMPS) and proposed a concrete CLMPS scheme.However,their construction has three problems:the definition of the strengthened security model is inaccurate,the concrete signature scheme has a security flaw,and the proof of the security is imperfect.With further consideration,a remedial strengthened security model is redefined,and an improved scheme is also proposed,which is existentially unforgeable against adaptively chosen-warrant,chosen-message and chosen-identity attacks in the random oracles.In this condition,the computational Diffie-Hellman(CDH) assumption is used to prove full security for our CLMPS scheme.
Multi-proxy signature is a scheme that an original signer delegates his or her signing capability to a proxy group. The scheme, only the cooperation of all proxy signers in the proxy group can create a signature on behalf of the original signer. Jin and Wen first defined the formal security model of certificateless multi-proxy signature (CLMPS) and proposed a concrete CLMPS scheme. However, their construction has three problems: the definition of the strengthened security model is inaccurate, the concrete signature scheme has a security flaw, and the proof of the security is imperfect .With further consideration, a remedial strengthened security model is redefined, and an improved scheme is also proposed, which is existentially unforgeable against adaptively chosen-warrant, chosen-message and chosen-identity attacks in the random In this condition, the computational Diffie-Hellman (CDH) assumption is used to prove full security for our CLMPS scheme.