A study on frame encryption for protecting IPTV contents

IPTV provides information services, video contents and broadcast services using high-speed network. It is in the limelight after its commercialization and vitalizations. For protecting and authenticating the transmitted contents, IPTV system is equipped with a combination of CAS and DRM system for VOD contents but the system is too complicated and the construction is too costly. To address this problem, multicast DRM system was on the rise but it also has a problem that unauthorized users can illegally watch broadcasting if the key is leaked out to malicious users. This study proposes a scrambling encryption method which involves rearranging images by changing the values for each pixel using hash function instead of complicated encryption process in multicast DRM system. After designing and implementing the proposed system, performance and validity have been examined through testing its safety and computing speed.