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

Keitaro Hashimoto; Wakaha Ogata; Toi Tomita

Paper 2019/1367

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

Keitaro Hashimoto, Wakaha Ogata, and 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.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint.
Keywords: certificateless signatures tight security
Contact author(s): hashimoto k au @ m titech ac jp
History: 2019-12-10: last of 3 revisions; 2019-11-27: received; See all versions
Short URL: https://ia.cr/2019/1367
License: CC BY

BibTeX

@misc{cryptoeprint:2019/1367,
      author = {Keitaro Hashimoto and Wakaha Ogata and Toi Tomita},
      title = {Tight reduction for generic construction of certificateless signature and its instantiation from DDH assumption},
      howpublished = {Cryptology ePrint Archive, Paper 2019/1367},
      year = {2019},
      note = {\url{https://eprint.iacr.org/2019/1367}},
      url = {https://eprint.iacr.org/2019/1367}
}