Open AccessDesign of new scan orders for perceptual encryption of H.264/AVC videos
Author(s) -
Ding Xiangling,
Deng Yingzhuo,
Yang Gaobo,
Song Yun,
He Dajiang,
Sun Xingming
Publication year - 2017
Publication title -
iet information security
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.308
H-Index - 34
eISSN - 1751-8717
pISSN - 1751-8709
DOI - 10.1049/iet-ifs.2015.0492
Subject(s) - encryption , scrambling , computer science , encoder , discrete cosine transform , algorithm , zigzag , computer hardware , theoretical computer science , computer vision , image (mathematics) , mathematics , computer network , operating system , geometry
In this study, a perceptual encryption algorithm is proposed for H.264/AVC video to enhance the scrambling effect and encryption space. Six new scan orders are designed for H.264/AVC encoder by analysing the energy distribution of discrete cosine transform coefficients. They are proven to have similar performance as the conventional zigzag scan order and its symmetrical scan order. These six new scan orders are combined with two existing scan orders to design a scan‐order based perceptual encryption algorithm. Specifically, video encryption is achieved more specifically by randomly selecting one scan order from the eight scan orders with a security key, and the sign bit flipping of DC coefficients is also incorporated to further increase the encryption space. Experimental results show that the proposed approach has the advantages of both low bitrate increase and low computational cost. Furthermore, it is more flexible and has stronger security than the existing scan‐order based video encryption schemes.