[Resource Topic] 2019/1367: Tight reduction for generic construction of certificateless signature and its instantiation from DDH assumption

Welcome to the resource topic for 2019/1367

Title:
Tight reduction for generic construction of certificateless signature and its instantiation from DDH assumption

Authors: Keitaro Hashimoto, Wakaha Ogata, Toi Tomita

Abstract:

Certificateless signature was proposed by Al-Riyami and Paterson to eliminate the certificate management in the public-key infrastructures and solve the key escrow problem in the identity-based signature. In 2007, Hu et al. proposed a generic construction of certificateless signature. They construct certificateless signature scheme from any standard identity-based signature and signature scheme.However, their security reduction is loose; the security of the constructed scheme depends on the number of users. In this paper, we give the tight reduction for their construction and instantiate a tightly-secure certificateless signature scheme without pairing from DDH assumption. Best of our knowledge, this scheme is the first tightly-secure certificateless signature scheme.

ePrint: https://eprint.iacr.org/2019/1367

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