SECURED VIDEO STREAM ACROSS WIRELESS NETWORKS

Abstract

Recent advances in digital media technologies have created a large number of secured multimedia applications. Those applications and services are often deployed in a wireless network environment. Generally, three main contexts play the main roles in streaming secured video stream across wireless network. These contexts include video compression techniques, adaptation of transmitted video stream according to the available bandwidth, and the applied security techniques.

There are several video coding techniques that compress video sequences to bit streams. These coding techniques exploit spatial and temporal redundancy to achieve high compression ratios. However, they are usually unaware about the channel conditions and client resources. Thus, transcoding of video contents was introduced as a key technology to make this possible. The role of the transcoder is to adapt the contents of a video stream to fit the client capabilities. Additionally, Transcoding is performed according to the change in the available resources. Transcoders are introduced to tailor the same media contents to different derived users. However, transmitting the multimedia contents across wireless network makes them vulnerable to malicious attacks. Thus, the security concerns, if not addressed appropriately, will potentially prevent or delay the wide dissemination of the multimedia applications.