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Paper 2011/402

Formalizing Group Blind Signatures and Practical Constructions without Random Oracles

Essam Ghadafi

Abstract

Group blind signatures combine anonymity properties of both group signatures and blind signatures and offer privacy for both the message to be signed and the signer. Their applications include multi-authority e-voting and distributed e-cash systems. The primitive has been introduced with only informal definitions for its required security properties. We offer two main contributions: first, we provide foundations for the primitive where we present formal security definitions offering various flavors of anonymity relevant to this setting. In the process, we identify and address some subtle issues which were not considered by previous constructions and (informal) security definitions. Our second main contribution is a generic construction that yields practical schemes with round-optimal signing and constant-size signatures. Our constructions permit dynamic and concurrent enrollment of new members, satisfy strong security requirements, and do not rely on random oracles. In addition, we introduce some new building blocks which may be of independent interest.

Note: Re-organized the paper and added a generic description of the construction...

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PDF
Publication info
Published elsewhere. Unknown where it was published
Keywords
Group SignaturesBlind SignaturesGroup Blind SignaturesStandard Model.
Contact author(s)
eg6947 @ googlemail com
History
2014-03-18: last of 11 revisions
2011-07-28: received
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Short URL
https://ia.cr/2011/402
License
Creative Commons Attribution
CC BY
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