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To avoid delays arising from a need to decrypt a video prior to transcodingand then re-encrypt it afterwards, this paper assesses a selective encryption(SE) content protection scheme. The scheme is suited to both recentstandardized codecs, namely H.264/Advanced Video Coding (AVC) and HighEfficiency Video Coding (HEVC). Specifically, the paper outlines a jointcrypto-transcoding scheme for secure transrating of a video bitstream. That isto say it generates new video bitrates, possibly as part of an HTTP AdaptiveStreaming (HAS) content delivery network. The scheme will reduce the bitrate toone or more lower desired bit-rate without consuming time in theencryption/decryption process, which would be the case when full encryption isused. In addition, the decryption key no longer needs to be exposed atintermediate middleboxes, including when transrating is performed in a clouddatacenter. The effectiveness of the scheme is variously evaluated: byexamination of the SE generated visual distortion; by the extent ofcomputational and bitrate overheads; and by choice of cipher when encryptingthe selected elements within the bitstream. Results indicate that thereremains: a content; quantization level (after transrating of an encryptedvideo); and codec-type dependency to any distortion introduced. A furtherrecommendation is that the Advanced Encryption Standard (AES) is preferred forSE to lightweight XOR encryption, despite it being taken up elsewhere as areal-time encryption method.

Effectiveness of Crypto-Transcoding for H.264/AVC and HEVC Video Bit-streams