[Resource Topic] 2004/190: Distributed Ring Signatures for Identity-Based Scenarios

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Distributed Ring Signatures for Identity-Based Scenarios

Authors: Javier Herranz, Germán Sáez


In a ring signature scheme, a signer in a subset (or {\it ring})
of potential signers produces a signature of a message in such a
way that the receiver can verify that the signature comes from a
member of the ring, but cannot know which member has actually

In this work, we extend this concept to that of distributed ring
signatures, where a subset of users cooperate to compute a
distributed anonymous signature on a message, on behalf of a
family of subsets. We propose two schemes, one for general
families of subsets, and a more efficient one for threshold
families of subsets. The security of both proposals is formally
proved, assuming the hardness of the Computational Diffie-Hellman

Our two schemes run in an identity-based scenario, where public
keys of the users can be derived from their identities. This fact
avoids the necessity of digital certificates, and therefore allows
more efficient implementations of such systems.

ePrint: https://eprint.iacr.org/2004/190

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