| Summary: | 碩士 === 國立屏東教育大學 === 資訊科學系碩士班 === 101 === In this thesis, an available visually of encryption technology based on H.264/AVC are proposed.With the features of fast encoding and video distortion controlled within an acceptable range,it can be used to effectively resist copying or piracy. Assume the application environment is that the user can download available visually encrypted video from the Internet and play them.With payment,the user will get the decryption keys to have the unencrypted normal video.Without payment,the user will get a low-quality free and public content.Thus, people can understand the video content for the purpose of advertisement.
We propose two encryption schemes, which find the corresponding DC and AC coefficient values to do encryption after the CAVLC coding.In both schemes, only the I-Frameshave been encrypted.The encrypted I-Framesare affected.Due to referring to the encrypted I-Frames,the P-Frames are alsoaffected.Therefore,all frames are affected and distorted to achieve the effect of encryption.
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