Convertible Group Undeniable Signatures
Journal
Lecture Notes in Computer Science
Journal Volume
2587
Pages
48-61
Date Issued
2003
Date
2002
Author(s)
Wu, Ming-Luen
DOI
20060927122848007824
Abstract
Group undeniable signatures are like ordinary group signatures
except that verifying signatures needs the help of the group manager.
In this paper, we propose a convertible group undeniable signature
scheme in which the group manager can turn all or selective signatures,
which are originally group undeniable signatures, into ordinary group
signatures without compromising security of the secret key needed to
generate signatures. The proposed scheme also allows the group manager
to delegate the ability to confirm and deny to a limited set of parties
without providing them the capability of generating signatures. For business
applications, convertible group undeniable signatures can be widely
used to validate price lists, press release or digital contracts when the
signatures are commercially sensitive or valuable to a competitor. Our
scheme is unforgeable, signature-simulatable and coalition-resistant. The
confirmation and denial protocols are also zero-knowledge. Furthermore,
the time, space and communication complexity are independent of the
group size.
Publisher
臺北市:國立臺灣大學資訊工程學系
Type
other
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