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Erschienen in:
2009 | OriginalPaper | Buchkapitel
Dynamic Universal Accumulators for DDH Groups and Their Application to Attribute-Based Anonymous Credential Systems
verfasst von : Man Ho Au, Patrick P. Tsang, Willy Susilo, Yi Mu
Erschienen in: Topics in Cryptology – CT-RSA 2009
Verlag: Springer Berlin Heidelberg
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We present the first dynamic universal accumulator that allows (1) the accumulation of elements in a DDH-hard group
$\mathbb{G}$
and (2) one who knows
x
such that
y
=
g
x
has — or has
not
— been accumulated, where
g
generates
$\mathbb{G}$
, to efficiently prove her knowledge of such
x
in zero knowledge, and hence without revealing, e.g.,
x
or
y
.
We introduce the
Attribute-Based Anonymous Credential System
, which allows the verifier to authenticate anonymous users according to any access control policy expressible as a formula of
possibly negated
boolean user attributes. We construct the system from our accumulator.