No / Information security has been a critical issue in the design and development of reliable distributed communication systems and has attracted significant research efforts. A challenging task is how to maintain information security at a high level for multiple-destination video applications with the huge volume of data and dynamic property of clients. This paper proposes a novel Content-Aware Secure Multicast (CASM) protocol for video distribution that seamlessly integrates three important modules: 1) a scalable light-weight algorithm for group key management; 2) a content-aware key embedding algorithm that can make video quality distortion imperceptible and is reliable for clients to detect embedded keys; and 3) a smart two-level video encryption algorithm that can selectively encrypt a small set of video data only, and yet ensure the video as well as the embedded keys unrecognizable without a genuine key. The implementation of the CASM protocol is independent of the underlying multicast mechanism and is fully compatible with existing coding standards. Performance evaluation studies built upon a CASM prototype have demonstrated that CASM is highly robust and scalable in dynamic multicast environments. Moreover, it ensures secure distribution of key and video data with minimized communication and computation overheads. The proposed content-aware key embedding and encryption algorithms are fast enough to support real-time video multicasting.

IT inom vården blir allt vanligare och med det möjligheterna till kommunikation mellan patient och vårdgivare. Denna uppsats syfte är att undersöka vilken nytta och möjligheter ljud- och videokommunikation kombinerat med samtidig visning av webbplatsen Onkonnect kan erbjuda patienter och vårdgivare under cancerrådgivning. Som möjliggörande teknik för denna kommunikation används WebRTC. Uppsatsen innefattar intervjuer, utveckling och test av en konceptuell prototyp samt utveckling och användartest av slutgiltig prototyp. Resultaten av testerna och intervjuerna sammanställs sedan för att visa på nyttan och möjligheterna med ljud- och videokommunikation kombinerat med samtidig visning av webbsidor i rådgivningssituationer. / IT in health care is becoming more common, and with it the possibilities of communication between patient and caregiver. This document aims to examine what benefits and opportunities audio-visual communications, combined with simultaneous viewing of the website Onkonnect, can offer patients and caregivers during cancer consultation. As the enabling technology for this communication WebRTC was used. This document includes interviews, development and testing of a conceptual prototype, development and user testing of the final prototype. The results of the tests and the interviews are then compiled to demonstrate benefits and possibilities of audio-visual communications, combined with simultaneous viewing of web pages in counseling situations.