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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Efficient Identity Based Ring Signature
verfasst von : Sherman S. M. Chow, Siu-Ming Yiu, Lucas C. K. Hui
Erschienen in: Applied Cryptography and Network Security
Verlag: Springer Berlin Heidelberg
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Identity-based (ID-based) cryptosystems eliminate the need for validity checking of the certificates and the need for registering for a certificate before getting the public key. These two features are desirable especially for the efficiency and the real spontaneity of ring signature, where a user can anonymously sign a message on behalf of a group of spontaneously conscripted users including the actual signer.
In this paper, we propose a novel construction of ID-based ring signature which only needs two pairing computations for any group size. The proposed scheme is proven to be existential unforgeable against adaptive chosen message-and-identity attack under the random oracle model, using the forking lemma for generic ring signature schemes. We also consider its extension to support the general access structure.