Cryptology ePrint Archive: Report 2016/844

Secure and Efficient Construction of Broadcast Encryption with Dealership

Kamalesh Acharya and Ratna Dutta

Abstract: Broadcast encryption with dealership (BED) has been proposed to achieve more innovative and scalable business models for broadcast services. It has an extensive application future. However, designing secure BED is a challenging task. The only known BED construction sofar is by Gritti et al. We aim to raise the pro le of BED primitives which has not received much attention despite of its importance. This paper presents a selectively chosen plaintext attack (CPA) secure BED scheme supporting maximum number of accountability and privacy (hides the group of users from broadcaster). Our scheme is a key encapsulation mechanism and practically more efficient. It reduces the parameter sizes and computation cost compared to Gritti et al. More interestingly, the broadcaster does not need to rely on users to detect the dishonest dealer. We provide concrete security analysis of our design under reasonable assumptions.

Category / Keywords: public-key cryptography / broadcast encryption with dealership, chosen plaintext attack, maximum number of accountability, privacy.

Original Publication (in the same form): will appear in the proceeding of ProvSec 2016

Date: received 2 Sep 2016

Contact author: kamaleshiitkgp at gmail com

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Version: 20160906:154429 (All versions of this report)

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