2019/02/19 by Rizwan Ali Shah, Shah, Rizwan A., Mamoona Naveed Asghar +7
Computer Science · #Advanced Steganography and Watermarking Techniques #Chaos-based Image/Signal Encryption #FOS: Computer and information sciences #Internet Traffic Analysis and Secure E-voting #Multimedia (cs.MM)
paper · pdf · doi:10.48550/arxiv.1902.06990
openalex publication_date 2019/02/19 · openalex created_date 2022/07/29 · openalex updated_date 2026/07/28
To avoid delays arising from a need to decrypt a video prior to transcoding\nand then re-encrypt it afterwards, this paper assesses a selective encryption\n(SE) content protection scheme. The scheme is suited to both recent\nstandardized codecs, namely H.264/Advanced Video Coding (AVC) and High\nEfficiency Video Coding (HEVC). Specifically, the paper outlines a joint\ncrypto-transcoding scheme for secure transrating of a video bitstream. That is\nto say it generates new video bitrates, possibly as part of an HTTP Adaptive\nStreaming (HAS) content delivery network. The scheme will reduce the bitrate to\none or more lower desired bit-rate without consuming time in the\nencryption/decryption process, which would be the case when full encryption is\nused. In addition, the decryption key no longer needs to be exposed at\nintermediate middleboxes, including when transrating is performed in a cloud\ndatacenter. The effectiveness of the scheme is variously evaluated: by\nexamination of the SE generated visual distortion; by the extent of\ncomputational and bitrate overheads; and by choice of cipher when encrypting\nthe selected elements within the bitstream. Results indicate that there\nremains: a content; quantization level (after transrating of an encrypted\nvideo); and codec-type dependency to any distortion introduced. A further\nrecommendation is that the Advanced Encryption Standard (AES) is preferred for\nSE to lightweight XOR encryption, despite it being taken up elsewhere as a\nreal-time encryption method.\n