schemes has focused on the type of the partial delegation with warrant. In this paper, we firstly propose a designated confirmer proxy signature scheme. In the proposed scheme, the original signer delegates his/her signing rights to the proxy signer like other proxy signature schemes. If anyone wants to verify the signature, the proxy signer or the confirmer designated by the original signer must be included in the verification step. The rest of this paper is organized as follows. In section 2, we give notations which will be used in this paper and security requirements of the proposed scheme. In section 3, we review Okamoto’s designated confirmer signature scheme and its drawback. We also propose a designated confirmer signature scheme modified from Okamoto's scheme. In section 4, we propose a designated confirmer proxy signature scheme and discuss its security properties. We give a conclusion in sectio
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