Multimedia data encryption in block-based codecs

Authors:
S. Lian;Z. Liu;Z. Ren;Z. Wang
Affiliations:
France Telecom R&D Bejing, Beijing, P.R. China and Nanjing University of Science and Technology, Nanjing, P.R. China;France Telecom R&D Bejing, Beijing, P.R. China;France Telecom R&D Bejing, Beijing, P.R. China;Nanjing University of Science and Technology, Nanjing, P.R. China
Venue:
International Journal of Computers and Applications
Year:
2007

Citing 3
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Abstract

Multimedia data encryption is suitable for copyright protection. In this paper, a multimedia encryption scheme combined with block-based codecs (such as JPEG/JPEG2000, MPEG1/2, or H.261/263) is proposed, which permutes block positions, permutes coefficients (discrete cosign transform (DCT) coefficients or wavelet coefficients), and encrypts coefficient signs. It is extended to a perceptual encryption scheme and a secure video-on-demand (VOD) scheme. Theoretical analyses and experimental results show that this encryption scheme is of low-cost, supports direct bit-rate control, and is of higher robustness to transmission errors. These properties make it suitable for secure image or video transmission.