A New Digital Signature Scheme on ID-Based Key-Sharing Infrastructures

  • Authors:
  • Tsuyoshi Nishioka;Goichiro Hanaoka;Hideki Imai

  • Affiliations:
  • -;-;-

  • Venue:
  • ISW '99 Proceedings of the Second International Workshop on Information Security
  • Year:
  • 1999

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Abstract

Recently, many researchers have been working on ID-based key sharing schemes. The Key Predistiribution Systems (KPS) are a large class of such key sharing schemes. The remarkable property of KPS is that in order to share a key, a participant should only input its partner's identifier to its own secret-algorithm. In this paper, we propose a new signature scheme on the KPS infrastructure. Namely, it is shown that if an ID-based key sharing system which belongs to KPS is provided, a digital signature scheme can easily be realized on top of it. Moreover, this signature scheme is secure if the discrete logarithm problem is hard to solve. Although there already exists a digital signature scheme based on KPS, it has two flaws that its verifier is designated and that tamper resitstant module is needed. Our proposal solves these problems. Any entity can authenticate the signature in the new signature scheme which is based on inherence of key generator itself instead of common key. Moreover, tamper resistant module is not necessarily needed. We introduce the new concept of "one-way homomorphism" in order to realize our proposal.