S. Lian, Z. Liu, Z. Ren, and Z. Wang
Multimedia content protection, image encryption, video encryption, secure multimedia transmission, video-on-demand (VOD)
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.
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