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A novel secure H.264 transcoder using selective encryption

Research output: Contribution to conferenceAbstract

Original languageEnglish
Publication dateSep 2007
PagesIV-85 - IV-88
DOIs
StatePublished

Abstract

In digital broadcast TV systems, video data is normally encrypted before transmission. For in-home redistribution, it is often necessary to transcode the bitstream to achieve optimum utilization of available bandwidth. If a signal is decrypted before transcoding and re-encrypted, this may lead to a security loophole. This paper presents a solution in the form of a novel H.264 selective encryption algorithm that encrypts sign bits of transform coefficients and motion vectors to allow secure transcoding without decryption. The performance of this system is compared with I-frame encryption. The results show that sign encryption is more secure than I-frame encryption and has a lower complexity. A hybrid system using a modified transcoder and sign encryption is found to give an optimal compromise between security and transcoding performance.

Additional information

Terms of use: Copyright © 2007 IEEE. Reprinted from IEEE International Conference on Image Processing, 2007 (ICIP 2007). This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Name of Conference: International Conference on Image Processing Venue of Conference: San Antonio, USA

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Research areas

  • TV broadcasting, video coding, security, cryptography

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