Cryptology ePrint Archive: Report 2008/389

Optimal Subset-Difference Broadcast Encryption with Free Riders

Murat Ak and Kamer Kaya and Ali Aydin Selcuk

Abstract: Broadcast encryption (BE) deals with secure transmission of a message to a group of receivers such that only an authorized subset of receivers can decrypt the message. The transmission cost of a BE system can be reduced considerably if a limited number of free riders can be tolerated in the system. In this paper, we study the problem of how to optimally place a given number of free riders in a subset difference (SD) based BE system, which is currently the most efficient BE scheme in use and has also been incorporated in standards, and we propose a polynomial-time optimal placement algorithm and three more efficient heuristics for this problem. Simulation experiments show that SD-based BE schemes can benefit significantly from the proposed algorithms.

Category / Keywords: secret-key cryptography / Broadcast encryption, subset difference scheme, free riders

Date: received 10 Sep 2008

Contact author: kamer at cs bilkent edu tr

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Version: 20080915:153503 (All versions of this report)

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