Title: Convertible identity-based anonymous designated ring signatures

Authors: Yiqun Chen, Willy Susilo, Yi Mu

Addresses: School of IT and Computer Science, University of Wollongong, Northfields Avenue, NSW 2522, Australia. ' School of IT and Computer Science, University of Wollongong, Northfields Avenue, NSW 2522, Australia. ' School of IT and Computer Science, University of Wollongong, Northfields Avenue, NSW 2522, Australia

Abstract: In this paper, we propose the concept of identity-based anonymous designated ring signature. This concept extends the existing notion of ring signatures in two ways: firstly, it allows a member from the ring to sign a message directed to a designated verifier, but secondly, we would like to have an anonymous designated verifier. At a glance, these two additional properties seem contradictory, but we shall show an example of a situation where this kind of primitive is required. We present a formal model of such a scheme and proceed with a construction based on bilinear pairings. Our scheme is provably secure under the random oracle model. We also present an extension of this concept, namely convertible identity-based anonymous designated ring signatures that allow the signer to prove the ownership of the signature, if necessary.

Keywords: peer-to-peer; P2P networks; ad-hoc networks; designated ring signatures; anonymity; security; identity-based.

DOI: 10.1504/IJSN.2006.011781

International Journal of Security and Networks, 2006 Vol.1 No.3/4, pp.218 - 225

Available online: 21 Dec 2006 *

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