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For instance, Is there a scheme where 100 people could produce a signature that is only as long as one signature?

Is there one like this that can be done where each person can merely modify an existing signature to add theirs to an existing group signature without the group's cooperation?

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    $\begingroup$ Have you looked at pairing based multi signature schemes? In particular the one proposed by Boneh Dan Boneh - Short Signatures based on Weil Pairings $\endgroup$
    – user69644
    Jun 19, 2019 at 18:52
  • $\begingroup$ Thanks, this is what I was looking for! $\endgroup$
    – user40176
    Jul 21, 2019 at 19:37

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