Compressed Domain Authentication of Live Video

Video authentication techniques generally do not allow any form of manipulation, thus making it impractical for adaptation operations. Moreover, conventional way to adapt and authenticate compressed video content is to perform cascaded decoding and re-encoding operations in some trusted intermediary nodes. In this paper, we propose an authentication scheme for live H.264 encoded video bitstream to verify integrity at the receiver´s side. The proposed design utilizes MPEG-21 gBSD for hard authentication in the compressed domain. The scheme uses content-based authentication data which is derived from a hash value and embeds a fragile watermark. System design and proof of concept implementation approach along with the performance evaluation is presented in detail.