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Simulatability and security of certificateless threshold signatures

Authors
Journal
Information Sciences
0020-0255
Publisher
Elsevier
Publication Date
Volume
177
Issue
6
Identifiers
DOI: 10.1016/j.ins.2006.08.008
Keywords
  • Digital Signature
  • Key Escrow
  • Certificateless
  • Threshold
  • Provable Security
  • Simulatabilty
Disciplines
  • Computer Science
  • Mathematics

Abstract

Abstract We analyze the relationship between the notion of certificateless public key cryptography (CL-PKC) and identity-based schemes without a trusted private key generator (PKG), formally define the security of certificateless threshold signatures, and propose a concrete implementation based on bilinear pairings. To exhibit the security of our proposal, we develop the theory of simulatability and relationship between the certificateless threshold signatures and the underlying (non-threshold) ID-based signatures. We show that the proposed scheme is robust and existentially unforgeable against adaptively chosen message attacks under CDH assumption in the random oracle model.

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