Identity-Based aggregate and multi-signature schemes based on RSA

  • Authors:
  • Ali Bagherzandi;Stanisław Jarecki

  • Affiliations:
  • Department of Computer Science, University of California, Irvine;Department of Computer Science, University of California, Irvine

  • Venue:
  • PKC'10 Proceedings of the 13th international conference on Practice and Theory in Public Key Cryptography
  • Year:
  • 2010

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Abstract

We propose new identity-based multi-signature (IBMS) and aggregate signature (IBAS) schemes, secure under RSA assumption. Our schemes reduce round complexity of previous RSA-based IBMS scheme of Bellare and Neven [BN07] from three to two rounds. Surprisingly, this improvement comes at virtually no cost, as the computational efficiency and exact security of the new scheme are almost identical to those of [BN07]. The new scheme is enabled by a technical tool of independent interest, a class of zero-knowledge proofs of knowledge of preimages of one-way functions which is straight-line simulatable, enabling concurrency and good exact security, and aggregatable, enabling aggregation of parallel instances of such proofs into short multi/aggregate signatures.