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Multisignatures Using Proofs of Secret Key Possession, as Secure as the Diffie-Hellman Problem

  • Ali Bagherzandi
  • Stanisław Jarecki
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5229)

Abstract

A multisignature scheme allows a group of n players to produce a short string which is equivalent to n separate signatures on the same message. Assuming the Random Oracle Model (ROM), the aggregate signature schemes of Boneh et al. [BGLS03] and Bellare and Neven [BN06] provide multisignatures secure in the standard public key setting, but their multisignature verification algorithms involve respectively O(n) bilinear maps and O(n) exponentiations. Ristenpart and Yilek [RY07] recently showed two multisignature schemes relying on groups with bilinear maps, with just O(1) bilinear maps in multisignature verification, which are secure if each public key is accompanied by so-called “proof of (secret key) possession” (POP). We show how to achieve secure multisignatures in the POP model using any group where CDH or DDH problems are hard. Both schemes have multisignature verification with O(1) exponentiations, and their POP messages take O(1) group elements and require O(1) exponentiations to verify. Moreover, the security of the proposed schemes is tightly related to the CDH and DDH problems, in ROM.

Keywords

Signature Scheme Random Oracle Model Signature Query Multisignature Scheme Hash Query 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Ali Bagherzandi
    • 1
  • Stanisław Jarecki
    • 1
  1. 1.Department of Computer ScienceUniversity of CaliforniaIrvine

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