Title: Anonymous broadcast encryption with an untrusted gateway

Authors: Hui Cui; Yi Mu; Man Ho Au

Addresses: School of Computer Science and Software Engineering, University of Wollongong, Wollongong, NSW2522, Australia ' School of Computer Science and Software Engineering, University of Wollongong, Wollongong, NSW2522, Australia ' School of Computer Science and Software Engineering, University of Wollongong, Wollongong, NSW2522, Australia

Abstract: We propose a verifiable and anonymous broadcast encryption scheme, where an 'untrusted' gateway can verify incoming communication flows to ensure only the intended (anonymous) receivers in the target domain can receive them. This scenario is interesting while the privacy of receivers should be considered. The difficulty in this setting is how to achieve both confidentiality of the message and anonymity of receivers during the gateway verification. To achieve this goal, we introduce a new notion of encrypted identity search, which allows the gateway blindly verifies the incoming traffic. Our scheme captures security properties: confidentiality and anonymity against dishonest gateway, corrupted receivers and collusion attacks. We present a concrete construction of gateway-based verifiable and anonymous broadcast encryption system from bilinear pairings, and give its security reduction under the computational assumptions related to bilinear pairings.

Keywords: anonymity; verifiable encryption; anonymous broadcast encryption; untrusted gateways; cryptography; receiver privacy; gateway verification; network security; encrypted identity search; confidentiality; dishonest gateways; corrupted receivers; collusion attacks.

DOI: 10.1504/IJSN.2014.059326

International Journal of Security and Networks, 2014 Vol.9 No.1, pp.20 - 29

Received: 04 Oct 2013
Accepted: 05 Oct 2013
Published online: 17 Feb 2014 *

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