Compressed-domain spatial adaptation resilient perceptual encryption of live H.264 video

In this paper, we present a slice-based encryption and spatial adaptation technique for H.264 videos. The encrypted video is resilient to spatial adaptation. All the encryption and adaptation steps are performed without any cascaded decoding and re-encoding operation. We use MPEG-21 gBSD as a metadata description of the compressed bitstream. This metadata is utilized to execute all the necessary footsteps in compressed-domain. The proposed encryption scheme can be applied to a compressed bitstream before or after adaptation operations. Moreover, the resultant bitstream conforms to H.264/AVC specification. Proof of the proposed encryption scheme and overall performance results established from the implemented system are also presented here.