A novel secure H.264 transcoder using selective encryption

NM Thomas; D Lefol; DR Bull; DW Redmill

doi:10.1109/ICIP.2007.4379960

A novel secure H.264 transcoder using selective encryption

NM Thomas, D Lefol, DR Bull, DW Redmill

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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.

Translated title of the contribution	A novel secure H.264 transcoder using selective encryption
Original language	English
Title of host publication	IEEE International Conference on Image Processing (ICIP 2007), San Antonio
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Pages	85 - 88
Number of pages	4
Volume	4
ISBN (Print)	9781424414369, 9781424414376
DOIs	https://doi.org/10.1109/ICIP.2007.4379960
Publication status	Published - 16 Sept 2007

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@inproceedings{91cedf41c1434063824ef971458ba2fd,

title = "A novel secure H.264 transcoder using selective encryption",

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.",

author = "NM Thomas and D Lefol and DR Bull and DW Redmill",

year = "2007",

month = sep,

day = "16",

doi = "10.1109/ICIP.2007.4379960",

language = "English",

isbn = "9781424414369",

volume = "4",

pages = "85 -- 88",

booktitle = "IEEE International Conference on Image Processing (ICIP 2007), San Antonio",

publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

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}

A novel secure H.264 transcoder using selective encryption. / Thomas, NM; Lefol, D; Bull, DR et al.
IEEE International Conference on Image Processing (ICIP 2007), San Antonio. Vol. 4 Institute of Electrical and Electronics Engineers (IEEE), 2007. p. 85 - 88.

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - A novel secure H.264 transcoder using selective encryption

AU - Thomas, NM

AU - Lefol, D

AU - Bull, DR

AU - Redmill, DW

PY - 2007/9/16

Y1 - 2007/9/16

N2 - 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.

AB - 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.

U2 - 10.1109/ICIP.2007.4379960

DO - 10.1109/ICIP.2007.4379960

M3 - Conference Contribution (Conference Proceeding)

SN - 9781424414369

SN - 9781424414376

VL - 4

SP - 85

EP - 88

BT - IEEE International Conference on Image Processing (ICIP 2007), San Antonio

PB - Institute of Electrical and Electronics Engineers (IEEE)

ER -

A novel secure H.264 transcoder using selective encryption

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