Abstract
A group signature scheme allows members of a group to anonymously sign messages. To counter misuse, the anonymity can be revoked by the so-called group manager.
This paper contributes two results to the area of group signatures. First, we improve the state-of-the-art scheme by Ateniese et al. by an order of magnitude. Our new scheme satisfies the recent security definition by Bellare et al. Second, and of a more theoretical nature, we study the Bellare et al. definitions and show that their notion of full-anonymity may require stronger assumptions than what is needed to achieve a relaxed but reasonable notion of anonymity.
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Camenisch, J., Groth, J. (2005). Group Signatures: Better Efficiency and New Theoretical Aspects. In: Blundo, C., Cimato, S. (eds) Security in Communication Networks. SCN 2004. Lecture Notes in Computer Science, vol 3352. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30598-9_9
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DOI: https://doi.org/10.1007/978-3-540-30598-9_9
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