NDLI: A Novel Secure H.264 Transcoder using Selective Encryption

Content Provider	IEEE Xplore Digital Library
Author	Thomas, N.M. Lefol, D. Bull, D.R. Redmill, D.
Copyright Year	2007
Description	Author affiliation: Bristol Univ., Bristol (Thomas, N.M.; Lefol, D.; Bull, D.R.; Redmill, D.)
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.
File Size	4993535
File Format	PDF
ISBN	9781424414369
ISSN	15224880
DOI	10.1109/ICIP.2007.4379960
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cryptography Transcoding Data security Discrete cosine transforms TV broadcasting Decoding Bandwidth Protection Streaming media Information security Video Coding TV Broadcasting Security
Content Type	Text
Resource Type	Article

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