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Provably Secure Delegation-by-Certification Proxy Signature Schemes
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Abstract: | In this paper, we first show that previous proxy signature schemes by delegation with certificate are not provably secure under adaptive-chosen message attacks and adaptive-chosen warrant attacks. The schemes do not provide the strong undeniability. Then we construct a proxy signature scheme by delegation with certificate based on Co-GDH group from bilinear map. Our proxy signature scheme is existentially unforgeable against adaptive-chosen message attacks and adaptive-chosen warrant attacks in random oracle model. We adopt a straight method of security reduction in which our scheme's security is reduced to hardness of the computational co-Diffie-Hellem problem. The proposed signature scheme is the first secure delegation-by-certificate proxy signature based on co-GDH groups from bilinear maps under the formal security model in random oracle model. |
BibTeX
@misc{eprint-2004-12120, title={Provably Secure Delegation-by-Certification Proxy Signature Schemes}, booktitle={IACR Eprint archive}, keywords={public-key cryptography / digital signature, proxy signature,bilinear map, co-GDH groups, provably secure}, url={http://eprint.iacr.org/2004/148}, note={ ztan@mmrc.iss.ac.cn 12594 received 24 Jun 2004}, author={Zuowen Tan and Zhuojun Liu}, year=2004 }