Paper 2006/285

Unrestricted Aggregate Signatures

Mihir Bellare, Chanathip Namprempre, and Gregory Neven


Secure use of the BGLS aggregate signature schemes is restricted to the aggregation of distinct messages (for the basic scheme) or per-signer distinct messages (for the enhanced, prepend-public-key version of the scheme). We argue that these restrictions preclude interesting applications, make usage of the schemes error-prone and are generally undesirable in practice. Via a new analysis and proof, we show how the restrictions can be lifted, yielding the first truly unrestricted aggregate signature scheme. Via another new analysis and proof, we show that the distinct signer restriction on the sequential aggregate signature schemes of Lysyanskaya et al. can also be dropped, yielding an unrestricted sequential aggregate signature scheme. Finally, we present variants of these schemes with tight security reductions.

Available format(s)
Publication info
Published elsewhere. Preliminary version in ICALP 2007. This is the full version.
Aggregate signaturessequential aggregate signatures
Contact author(s)
Gregory Neven @ esat kuleuven be
2007-05-15: revised
2006-08-22: received
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Creative Commons Attribution


      author = {Mihir Bellare and Chanathip Namprempre and Gregory Neven},
      title = {Unrestricted Aggregate Signatures},
      howpublished = {Cryptology ePrint Archive, Paper 2006/285},
      year = {2006},
      note = {\url{}},
      url = {}
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