CRYPT Seminar

Title: “Dynamic Universal Accumulators for DDH Groups and Their Application to Atttribute-Based Anonymous Credential Systems”

Speaker:  Dr. Man Ho Allen Au (University of Wollongong)

Day: Wednesday 27 May 2009
Location: Building 3. Common Staff Room
Time: 13.30-14.30

Abstract: "In this talk, we present the first dynamic universal accumulator that allows (1) the accumulation of elements in a DDH-hand group G, and (2) one who knows x such that y=g^x 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 anything such as x or y. In the second part of the talk, we introduce the Attribute-Based Anonymous Credential System (ABACS) 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 ABACS using our accumulator.

Result of this talk has been presented in the Cryptographers' Track at the RSA Conference 2009"