Document Type
Journal Article
RIS ID
32303
Citation
Au, Man Ho; Tsang, Patrick P.; Susilo, Willy; and Mu, Yi, 2009, Dynamic universal accumulators for DDH groups and their application to attribute-based anonymous credential systems, Lecture Notes in Computer Science, 5473, 295-308.
http://ro.uow.edu.au/era/1512
Abstract
We present the first dynamic universal accumulator that allows (1) the accumulation of elements in a DDH-hard group G and (2) one who knows x such that y = gx has — or has not — been accumulated, where g generates 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.