Paper 2004/027

Linkable Spontaneous Anonymous Group Signature for Ad Hoc Groups

Joseph K. Liu, Victor K. Wei, and Duncan S. Wong


We present a linkable spontaneously anonymous group (LSAG) signature scheme (alternatively known as linkable ring signature scheme) satisfying the following three properties. (1) Anonymity, or signer indistinguishability. (2) Linkability: That two signatures by the same signer can be linked. (3) Spontaneity: No group secret, therefore no group manager or group secret sharing setup. We reduce the security of our scheme to well-known problems under the random oracle model. Using the scheme, we construct a new efficient one-round e-voting system which does not have a registration phase. We also present a new efficient reduction of famous rewind simulation lemma which only relies on elementary probability theory. Threshold extensions of our scheme are also presented.

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Published elsewhere. To appear ACISP 2004.
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ksliu9 @ ie cuhk edu hk
2004-05-01: last of 2 revisions
2004-02-02: received
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      author = {Joseph K.  Liu and Victor K.  Wei and Duncan S.  Wong},
      title = {Linkable Spontaneous Anonymous Group Signature for Ad Hoc Groups},
      howpublished = {Cryptology ePrint Archive, Paper 2004/027},
      year = {2004},
      note = {\url{}},
      url = {}
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