MULTIMEDIA DATA ENCRYPTION IN BLOCK-BASED CODECS

S. Lian, Z. Liu, Z. Ren, and Z. Wang

Keywords

Multimedia content protection, image encryption, video encryption, secure multimedia transmission, videoondemand (VOD)

Abstract

Multimedia data encryption is suitable for copyright protection. In this paper, a multimedia encryption scheme combined with blockbased 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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