Identity-based chameleon hashing and signatures without key exposure

  • Authors:
  • Xiaofeng Chen;Fangguo Zhang;Willy Susilo;Haibo Tian;Jin Li;Kwangjo Kim

  • Affiliations:
  • -;-;-;-;-;-

  • Venue:
  • Information Sciences: an International Journal
  • Year:
  • 2014

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Abstract

The notion of chameleon hash function without key exposure plays an important role in designing secure chameleon signatures. However, all of the existing key-exposure free chameleon hash schemes are presented in the setting of certificate-based systems. In 2004, Ateniese and de Medeiros questioned whether there is an efficient construction for identity-based chameleon hashing without key exposure. In this paper, we propose the first identity-based chameleon hash scheme without key exposure based on the three-trapdoor mechanism, which provides an affirmative answer to the open problem. Moreover, we use the proposed chameleon hash scheme to design an identity-based chameleon signature scheme, which achieves all the desired security properties.