Integrity Assurance for Real-Time Video Recording

Surveillance cameras are widely used anywhere to record video data. Instead of the original video, extracted video are sometimes used to reduce the video size and keep the privacy. In order to counter the editing or copying by adversaries, assuring the integrity of the extracted video is one of the fundamental issues in this area. In 2005, Izu et at. proposed the sanitizable signature scheme PIATS in which partial data can be sanitized (closed) with keeping the integrity of the disclosed parts. Then, in 2010, they applied PIATS to video in MPEG-1 format and developed a prototype system. However, since the initial signature is generated after ending the recording, the gap between the ending time of the recording and the finished time of the signature generation becomes large when the video size grows. In this extended abstract, we report the outline of a newly developed dedicated encoder with some improvements.