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標題Title: Commutative Encryption and Watermarking in Video Compression
作者Authors: 廖子勳
上傳單位Department: 資訊工程系
上傳時間Date: 2009-11-6
上傳者Author: 廖子勳
審核單位Department: 資訊工程系
審核老師Teacher: 陳福坤
檔案類型Categories: 研究生論文報告Thesis
關鍵詞Keyword: DRM, partial encryption, video encryption, video, watermarking.
摘要Abstract: Abstract—A scheme is proposed to implement commutative
video encryption and watermarking during advanced video
coding process. In H.264/AVC compression, the intra-prediction
mode, motion vector difference and discrete cosine transform
(DCT) coefficients’ signs are encrypted, while DCT coefficients’
amplitudes are watermarked adaptively. To avoid that the water-
marking operation affects the decryption operation, a traditional
watermarking algorithm is modified. The encryption and water-
marking operations are commutative. Thus, the watermark can
be extracted from the encrypted videos, and the encrypted videos
can be re-watermarked. This scheme embeds the watermark
without exposing video content’s confidentiality, and provides
a solution for signal processing in encrypted domain. Addition-
ally, it increases the operation efficiency, since the encrypted
video can be watermarked without decryption. These properties
make the scheme a good choice for secure media transmission or
distribution.

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2009_11_5c80d0e5.ppt 1005Kb ppt 990 1715
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