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An Efficient Access Control Scheme for Multimedia Content Using Modified Hash Chain

Authors:
Shoko Imaizumi
Masaaki Fujiyoshi
Hitoshi Kiya

Keywords: multimedia communication, access control, key derivation, hash chain, cryptography

Abstract:
This paper proposes an access control scheme for multimedia content consisting of several media such as text, images, sound, and so on. The proposed scheme simultaneously controls access to each medium of multimedia content in which a hierarchy based on the quality (resolution, frame rate, bit rate, and so on) is allowed to be in one medium. The proposed scheme derives keys through hash chains, and each medium/entity is encrypted with each individual key. By introducing modified hash chains, the proposed scheme manages only a single key for multimedia content, and it delivers only a single key to a user for the content regardless of which parts in the content the user can access; whereas the conventional access control schemes having the above mentioned features manage and/or deliver multiple keys. The single managed key is not delivered to any user. Furthermore the proposed scheme is resilient to collusion attacks. Performance analysis shows the effectiveness of the proposed scheme. The proposed scheme is more secure and simpler than the conventional scheme in terms of key management and delivery.

Pages: 175 to 180

Copyright: Copyright (c) IARIA, 2011

Publication date: October 23, 2011

Published in: conference

ISSN: 2163-9027

ISBN: 978-1-61208-166-3

Location: Barcelona, Spain

Dates: from October 23, 2011 to October 29, 2011